Refactor ProxyIterators to AbstractDecorators
git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@131313 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Stephen Colebourne
parent
d3248e3613
commit
4b084fad6e
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@ -0,0 +1,115 @@
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/*
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* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/AbstractIteratorDecorator.java,v 1.1 2003/11/02 16:29:12 scolebourne Exp $
|
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* ====================================================================
|
||||
*
|
||||
* The Apache Software License, Version 1.1
|
||||
*
|
||||
* Copyright (c) 1999-2003 The Apache Software Foundation. All rights
|
||||
* reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
*
|
||||
* 3. The end-user documentation included with the redistribution, if
|
||||
* any, must include the following acknowledgement:
|
||||
* "This product includes software developed by the
|
||||
* Apache Software Foundation (http://www.apache.org/)."
|
||||
* Alternately, this acknowledgement may appear in the software itself,
|
||||
* if and wherever such third-party acknowledgements normally appear.
|
||||
*
|
||||
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
|
||||
* Foundation" must not be used to endorse or promote products derived
|
||||
* from this software without prior written permission. For written
|
||||
* permission, please contact apache@apache.org.
|
||||
*
|
||||
* 5. Products derived from this software may not be called "Apache"
|
||||
* nor may "Apache" appear in their names without prior written
|
||||
* permission of the Apache Software Foundation.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
|
||||
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
|
||||
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
||||
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
||||
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
* ====================================================================
|
||||
*
|
||||
* This software consists of voluntary contributions made by many
|
||||
* individuals on behalf of the Apache Software Foundation. For more
|
||||
* information on the Apache Software Foundation, please see
|
||||
* <http://www.apache.org/>.
|
||||
*
|
||||
*/
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package org.apache.commons.collections.iterators;
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import java.util.Iterator;
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/**
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* Provides basic behaviour for decorating an iterator with extra functionality.
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* <p>
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* All methods are forwarded to the decorated iterator.
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*
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* @since Commons Collections 3.0
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* @version $Revision: 1.1 $ $Date: 2003/11/02 16:29:12 $
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*
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* @author James Strachan
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* @author Stephen Colebourne
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*/
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public class AbstractIteratorDecorator implements Iterator {
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/** The iterator being decorated */
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private Iterator iterator;
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//-----------------------------------------------------------------------
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/**
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* Constructor that decorates the specified iterator.
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*
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* @param iterator the iterator to decorate, must not be null
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* @throws IllegalArgumentException if the collection is null
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*/
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public AbstractIteratorDecorator(Iterator iterator) {
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super();
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if (iterator == null) {
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throw new IllegalArgumentException("Iterator must not be null");
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}
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this.iterator = iterator;
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}
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/**
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* Gets the iterator being decorated.
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*
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* @return the decorated iterator
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*/
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protected Iterator getIterator() {
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return iterator;
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}
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//-----------------------------------------------------------------------
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public boolean hasNext() {
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return iterator.hasNext();
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}
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public Object next() {
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return iterator.next();
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}
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public void remove() {
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iterator.remove();
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}
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}
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@ -0,0 +1,138 @@
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/*
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* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/AbstractListIteratorDecorator.java,v 1.1 2003/11/02 16:29:12 scolebourne Exp $
|
||||
* ====================================================================
|
||||
*
|
||||
* The Apache Software License, Version 1.1
|
||||
*
|
||||
* Copyright (c) 1999-2003 The Apache Software Foundation. All rights
|
||||
* reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
*
|
||||
* 3. The end-user documentation included with the redistribution, if
|
||||
* any, must include the following acknowledgement:
|
||||
* "This product includes software developed by the
|
||||
* Apache Software Foundation (http://www.apache.org/)."
|
||||
* Alternately, this acknowledgement may appear in the software itself,
|
||||
* if and wherever such third-party acknowledgements normally appear.
|
||||
*
|
||||
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
|
||||
* Foundation" must not be used to endorse or promote products derived
|
||||
* from this software without prior written permission. For written
|
||||
* permission, please contact apache@apache.org.
|
||||
*
|
||||
* 5. Products derived from this software may not be called "Apache"
|
||||
* nor may "Apache" appear in their names without prior written
|
||||
* permission of the Apache Software Foundation.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
|
||||
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
|
||||
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
||||
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
||||
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
* ====================================================================
|
||||
*
|
||||
* This software consists of voluntary contributions made by many
|
||||
* individuals on behalf of the Apache Software Foundation. For more
|
||||
* information on the Apache Software Foundation, please see
|
||||
* <http://www.apache.org/>.
|
||||
*
|
||||
*/
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package org.apache.commons.collections.iterators;
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import java.util.ListIterator;
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/**
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* Provides basic behaviour for decorating a list iterator with extra functionality.
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* <p>
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* All methods are forwarded to the decorated list iterator.
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*
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* @since Commons Collections 3.0
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* @version $Revision: 1.1 $ $Date: 2003/11/02 16:29:12 $
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*
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* @author Rodney Waldhoff
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* @author Stephen Colebourne
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*/
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public class AbstractListIteratorDecorator implements ListIterator {
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/** The iterator being decorated */
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private ListIterator iterator;
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//-----------------------------------------------------------------------
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/**
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* Constructor that decorates the specified iterator.
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*
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* @param iterator the iterator to decorate, must not be null
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* @throws IllegalArgumentException if the collection is null
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*/
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public AbstractListIteratorDecorator(ListIterator iterator) {
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super();
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if (iterator == null) {
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throw new IllegalArgumentException("ListIterator must not be null");
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}
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this.iterator = iterator;
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}
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/**
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* Gets the iterator being decorated.
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*
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* @return the decorated iterator
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*/
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protected ListIterator getListIterator() {
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return iterator;
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}
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//-----------------------------------------------------------------------
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public boolean hasNext() {
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return iterator.hasNext();
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}
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public Object next() {
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return iterator.next();
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}
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public int nextIndex() {
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return iterator.nextIndex();
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}
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public boolean hasPrevious() {
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return iterator.hasPrevious();
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}
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public Object previous() {
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return iterator.previous();
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}
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public int previousIndex() {
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return iterator.previousIndex();
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}
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public void remove() {
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iterator.remove();
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}
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public void set(Object obj) {
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iterator.set(obj);
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}
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public void add(Object obj) {
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iterator.add(obj);
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}
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}
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@ -0,0 +1,130 @@
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/*
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* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/AbstractMapIteratorDecorator.java,v 1.1 2003/11/02 16:29:12 scolebourne Exp $
|
||||
* ====================================================================
|
||||
*
|
||||
* The Apache Software License, Version 1.1
|
||||
*
|
||||
* Copyright (c) 1999-2003 The Apache Software Foundation. All rights
|
||||
* reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
*
|
||||
* 3. The end-user documentation included with the redistribution, if
|
||||
* any, must include the following acknowledgement:
|
||||
* "This product includes software developed by the
|
||||
* Apache Software Foundation (http://www.apache.org/)."
|
||||
* Alternately, this acknowledgement may appear in the software itself,
|
||||
* if and wherever such third-party acknowledgements normally appear.
|
||||
*
|
||||
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
|
||||
* Foundation" must not be used to endorse or promote products derived
|
||||
* from this software without prior written permission. For written
|
||||
* permission, please contact apache@apache.org.
|
||||
*
|
||||
* 5. Products derived from this software may not be called "Apache"
|
||||
* nor may "Apache" appear in their names without prior written
|
||||
* permission of the Apache Software Foundation.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
|
||||
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
|
||||
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
||||
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
||||
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
* ====================================================================
|
||||
*
|
||||
* This software consists of voluntary contributions made by many
|
||||
* individuals on behalf of the Apache Software Foundation. For more
|
||||
* information on the Apache Software Foundation, please see
|
||||
* <http://www.apache.org/>.
|
||||
*
|
||||
*/
|
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package org.apache.commons.collections.iterators;
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import java.util.Map;
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/**
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* Provides basic behaviour for decorating a map iterator with extra functionality.
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* <p>
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* All methods are forwarded to the decorated map iterator.
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*
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* @since Commons Collections 3.0
|
||||
* @version $Revision: 1.1 $ $Date: 2003/11/02 16:29:12 $
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*
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* @author Stephen Colebourne
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*/
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public class AbstractMapIteratorDecorator implements MapIterator {
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/** The iterator being decorated */
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private MapIterator iterator;
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//-----------------------------------------------------------------------
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/**
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* Constructor that decorates the specified iterator.
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*
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* @param iterator the iterator to decorate, must not be null
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* @throws IllegalArgumentException if the collection is null
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*/
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public AbstractMapIteratorDecorator(MapIterator iterator) {
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super();
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if (iterator == null) {
|
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throw new IllegalArgumentException("MapIterator must not be null");
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}
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this.iterator = iterator;
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}
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/**
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* Gets the iterator being decorated.
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*
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* @return the decorated iterator
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*/
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protected MapIterator getMapIterator() {
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return iterator;
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}
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//-----------------------------------------------------------------------
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public boolean hasNext() {
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return iterator.hasNext();
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}
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public Object next() {
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return iterator.next();
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}
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public void remove() {
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iterator.remove();
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}
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public Object getKey() {
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return iterator.getKey();
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}
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public Object getValue() {
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return iterator.getValue();
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}
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public Object setValue(Object obj) {
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return iterator.setValue(obj);
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}
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public Map.Entry asMapEntry() {
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return iterator.asMapEntry();
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}
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}
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@ -1,5 +1,5 @@
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/*
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* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/FilterIterator.java,v 1.5 2003/09/29 22:02:33 scolebourne Exp $
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* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/FilterIterator.java,v 1.6 2003/11/02 16:29:12 scolebourne Exp $
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* ====================================================================
|
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*
|
||||
* The Apache Software License, Version 1.1
|
||||
|
|
@ -59,33 +59,33 @@ package org.apache.commons.collections.iterators;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import org.apache.commons.collections.Predicate;
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/**
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* A Proxy {@link Iterator Iterator} which takes a {@link Predicate Predicate} instance to filter
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* out objects from an underlying {@link Iterator Iterator} instance.
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* Only objects for which the
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* specified <code>Predicate</code> evaluates to <code>true</code> are
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* returned.
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* Decorates an iterator such that only elements matching a predicate filter
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* are returned.
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*
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* @since Commons Collections 1.0
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* @version $Revision: 1.5 $ $Date: 2003/09/29 22:02:33 $
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* @version $Revision: 1.6 $ $Date: 2003/11/02 16:29:12 $
|
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*
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* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
|
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* @author James Strachan
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* @author Jan Sorensen
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* @author Ralph Wagner
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* @author Stephen Colebourne
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*/
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public class FilterIterator extends ProxyIterator {
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public class FilterIterator implements Iterator {
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/** Holds value of property predicate. */
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/** The iterator being used */
|
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private Iterator iterator;
|
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/** The predicate being used */
|
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private Predicate predicate;
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|
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/** The next object in the iteration */
|
||||
private Object nextObject;
|
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/** Whether the next object has been calculated yet */
|
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private boolean nextObjectSet = false;
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//-------------------------------------------------------------------------
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//-----------------------------------------------------------------------
|
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/**
|
||||
* Constructs a new <code>FilterIterator</code> that will not function
|
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* until {@link #setIterator(Iterator) setIterator} is invoked.
|
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|
|
@ -101,7 +101,8 @@ public class FilterIterator extends ProxyIterator {
|
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* @param iterator the iterator to use
|
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*/
|
||||
public FilterIterator(Iterator iterator) {
|
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super(iterator);
|
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super();
|
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this.iterator = iterator;
|
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}
|
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/**
|
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|
@ -112,13 +113,12 @@ public class FilterIterator extends ProxyIterator {
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* @param predicate the predicate to use
|
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*/
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public FilterIterator(Iterator iterator, Predicate predicate) {
|
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super(iterator);
|
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super();
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this.iterator = iterator;
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this.predicate = predicate;
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}
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// Iterator interface
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//-------------------------------------------------------------------------
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//-----------------------------------------------------------------------
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/**
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* Returns true if the underlying iterator contains an object that
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* matches the predicate.
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@ -126,7 +126,7 @@ public class FilterIterator extends ProxyIterator {
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* @return true if there is another object that matches the predicate
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*/
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public boolean hasNext() {
|
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if ( nextObjectSet ) {
|
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if (nextObjectSet) {
|
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return true;
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} else {
|
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return setNextObject();
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|
@ -141,7 +141,7 @@ public class FilterIterator extends ProxyIterator {
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|||
* match the predicate
|
||||
*/
|
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public Object next() {
|
||||
if ( !nextObjectSet ) {
|
||||
if (!nextObjectSet) {
|
||||
if (!setNextObject()) {
|
||||
throw new NoSuchElementException();
|
||||
}
|
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|
|
@ -165,35 +165,57 @@ public class FilterIterator extends ProxyIterator {
|
|||
if (nextObjectSet) {
|
||||
throw new IllegalStateException("remove() cannot be called");
|
||||
}
|
||||
getIterator().remove();
|
||||
iterator.remove();
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Gets the iterator this iterator is using.
|
||||
*
|
||||
* @return the iterator.
|
||||
*/
|
||||
public Iterator getIterator() {
|
||||
return iterator;
|
||||
}
|
||||
|
||||
// Properties
|
||||
//-------------------------------------------------------------------------
|
||||
/** Getter for property predicate.
|
||||
* @return Value of property predicate.
|
||||
/**
|
||||
* Sets the iterator for this iterator to use.
|
||||
* If iteration has started, this effectively resets the iterator.
|
||||
*
|
||||
* @param iterator the iterator to use
|
||||
*/
|
||||
public void setIterator(Iterator iterator) {
|
||||
this.iterator = iterator;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Gets the predicate this iterator is using.
|
||||
*
|
||||
* @return the predicate.
|
||||
*/
|
||||
public Predicate getPredicate() {
|
||||
return predicate;
|
||||
}
|
||||
/** Setter for property predicate.
|
||||
* @param predicate New value of property predicate.
|
||||
|
||||
/**
|
||||
* Sets the predicate this the iterator to use.
|
||||
*
|
||||
* @param predicate the transformer to use
|
||||
*/
|
||||
public void setPredicate(Predicate predicate) {
|
||||
this.predicate = predicate;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Set nextObject to the next object. If there are no more
|
||||
* objects then return false. Otherwise, return true.
|
||||
*/
|
||||
private boolean setNextObject() {
|
||||
Iterator iterator = getIterator();
|
||||
Predicate predicate = getPredicate();
|
||||
while ( iterator.hasNext() ) {
|
||||
while (iterator.hasNext()) {
|
||||
Object object = iterator.next();
|
||||
if ( predicate.evaluate( object ) ) {
|
||||
if (predicate.evaluate(object)) {
|
||||
nextObject = object;
|
||||
nextObjectSet = true;
|
||||
return true;
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
/*
|
||||
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/FilterListIterator.java,v 1.4 2003/09/29 22:02:33 scolebourne Exp $
|
||||
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/FilterListIterator.java,v 1.5 2003/11/02 16:29:12 scolebourne Exp $
|
||||
* ====================================================================
|
||||
*
|
||||
* The Apache Software License, Version 1.1
|
||||
|
|
@ -59,6 +59,7 @@ package org.apache.commons.collections.iterators;
|
|||
|
||||
import java.util.ListIterator;
|
||||
import java.util.NoSuchElementException;
|
||||
|
||||
import org.apache.commons.collections.Predicate;
|
||||
|
||||
/**
|
||||
|
|
@ -70,15 +71,48 @@ import org.apache.commons.collections.Predicate;
|
|||
* returned by the iterator.
|
||||
*
|
||||
* @since Commons Collections 2.0
|
||||
* @version $Revision: 1.4 $ $Date: 2003/09/29 22:02:33 $
|
||||
* @version $Revision: 1.5 $ $Date: 2003/11/02 16:29:12 $
|
||||
*
|
||||
* @author Rodney Waldhoff
|
||||
*/
|
||||
public class FilterListIterator extends ProxyListIterator {
|
||||
public class FilterListIterator implements ListIterator {
|
||||
|
||||
// Constructors
|
||||
//-------------------------------------------------------------------------
|
||||
/** The iterator being used */
|
||||
private ListIterator iterator;
|
||||
|
||||
/** The predicate being used */
|
||||
private Predicate predicate;
|
||||
|
||||
/**
|
||||
* The value of the next (matching) object, when
|
||||
* {@link #nextObjectSet} is true.
|
||||
*/
|
||||
private Object nextObject;
|
||||
|
||||
/**
|
||||
* Whether or not the {@link #nextObject} has been set
|
||||
* (possibly to <code>null</code>).
|
||||
*/
|
||||
private boolean nextObjectSet = false;
|
||||
|
||||
/**
|
||||
* The value of the previous (matching) object, when
|
||||
* {@link #previousObjectSet} is true.
|
||||
*/
|
||||
private Object previousObject;
|
||||
|
||||
/**
|
||||
* Whether or not the {@link #previousObject} has been set
|
||||
* (possibly to <code>null</code>).
|
||||
*/
|
||||
private boolean previousObjectSet = false;
|
||||
|
||||
/**
|
||||
* The index of the element that would be returned by {@link #next}.
|
||||
*/
|
||||
private int nextIndex = 0;
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Constructs a new <code>FilterListIterator</code> that will not
|
||||
* function until
|
||||
|
|
@ -96,7 +130,8 @@ public class FilterListIterator extends ProxyListIterator {
|
|||
* @param iterator the iterator to use
|
||||
*/
|
||||
public FilterListIterator(ListIterator iterator ) {
|
||||
super(iterator);
|
||||
super();
|
||||
this.iterator = iterator;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -106,7 +141,8 @@ public class FilterListIterator extends ProxyListIterator {
|
|||
* @param predicate the predicate to use
|
||||
*/
|
||||
public FilterListIterator(ListIterator iterator, Predicate predicate) {
|
||||
super(iterator);
|
||||
super();
|
||||
this.iterator = iterator;
|
||||
this.predicate = predicate;
|
||||
}
|
||||
|
||||
|
|
@ -123,9 +159,7 @@ public class FilterListIterator extends ProxyListIterator {
|
|||
this.predicate = predicate;
|
||||
}
|
||||
|
||||
// ListIterator interface
|
||||
//-------------------------------------------------------------------------
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/** Not supported. */
|
||||
public void add(Object o) {
|
||||
throw new UnsupportedOperationException("FilterListIterator.add(Object) is not supported.");
|
||||
|
|
@ -189,36 +223,52 @@ public class FilterListIterator extends ProxyListIterator {
|
|||
throw new UnsupportedOperationException("FilterListIterator.set(Object) is not supported.");
|
||||
}
|
||||
|
||||
// Properties
|
||||
//-------------------------------------------------------------------------
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Gets the iterator this iterator is using.
|
||||
*
|
||||
* @return the iterator.
|
||||
*/
|
||||
public ListIterator getListIterator() {
|
||||
return iterator;
|
||||
}
|
||||
|
||||
/**
|
||||
* Getter for the predicate property.
|
||||
* @return value of the predicate property.
|
||||
* Sets the iterator for this iterator to use.
|
||||
* If iteration has started, this effectively resets the iterator.
|
||||
*
|
||||
* @param iterator the iterator to use
|
||||
*/
|
||||
public void setListIterator(ListIterator iterator) {
|
||||
this.iterator = iterator;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Gets the predicate this iterator is using.
|
||||
*
|
||||
* @return the predicate.
|
||||
*/
|
||||
public Predicate getPredicate() {
|
||||
return predicate;
|
||||
}
|
||||
|
||||
/**
|
||||
* Setter for the predicate property.
|
||||
* @param predicate new value for the predicate property.
|
||||
* Sets the predicate this the iterator to use.
|
||||
*
|
||||
* @param predicate the transformer to use
|
||||
*/
|
||||
public void setPredicate(Predicate predicate) {
|
||||
this.predicate = predicate;
|
||||
}
|
||||
|
||||
// Private Methods
|
||||
//-------------------------------------------------------------------------
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
private void clearNextObject() {
|
||||
nextObject = null;
|
||||
nextObjectSet = false;
|
||||
}
|
||||
|
||||
private boolean setNextObject() {
|
||||
ListIterator iterator = getListIterator();
|
||||
Predicate predicate = getPredicate();
|
||||
|
||||
// if previousObjectSet,
|
||||
// then we've walked back one step in the
|
||||
// underlying list (due to a hasPrevious() call)
|
||||
|
|
@ -249,9 +299,6 @@ public class FilterListIterator extends ProxyListIterator {
|
|||
}
|
||||
|
||||
private boolean setPreviousObject() {
|
||||
ListIterator iterator = getListIterator();
|
||||
Predicate predicate = getPredicate();
|
||||
|
||||
// if nextObjectSet,
|
||||
// then we've walked back one step in the
|
||||
// underlying list (due to a hasNext() call)
|
||||
|
|
@ -276,38 +323,4 @@ public class FilterListIterator extends ProxyListIterator {
|
|||
return false;
|
||||
}
|
||||
|
||||
// Attributes
|
||||
//-------------------------------------------------------------------------
|
||||
|
||||
/** Holds value of property "predicate". */
|
||||
private Predicate predicate;
|
||||
|
||||
/**
|
||||
* The value of the next (matching) object, when
|
||||
* {@link #nextObjectSet} is true.
|
||||
*/
|
||||
private Object nextObject;
|
||||
|
||||
/**
|
||||
* Whether or not the {@link #nextObject} has been set
|
||||
* (possibly to <code>null</code>).
|
||||
*/
|
||||
private boolean nextObjectSet = false;
|
||||
|
||||
/**
|
||||
* The value of the previous (matching) object, when
|
||||
* {@link #previousObjectSet} is true.
|
||||
*/
|
||||
private Object previousObject;
|
||||
|
||||
/**
|
||||
* Whether or not the {@link #previousObject} has been set
|
||||
* (possibly to <code>null</code>).
|
||||
*/
|
||||
private boolean previousObjectSet = false;
|
||||
|
||||
/**
|
||||
* The index of the element that would be returned by {@link #next}.
|
||||
*/
|
||||
private int nextIndex = 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
/*
|
||||
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/ProxyIterator.java,v 1.5 2003/09/29 22:02:33 scolebourne Exp $
|
||||
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/ProxyIterator.java,v 1.6 2003/11/02 16:29:12 scolebourne Exp $
|
||||
* ====================================================================
|
||||
*
|
||||
* The Apache Software License, Version 1.1
|
||||
|
|
@ -62,11 +62,11 @@ import java.util.Iterator;
|
|||
/**
|
||||
* A Proxy {@link Iterator Iterator} which delegates its methods to a proxy instance.
|
||||
*
|
||||
* @see ProxyListIterator
|
||||
* @deprecated Use AbstractIteratorDecorator
|
||||
* @since Commons Collections 1.0
|
||||
* @version $Revision: 1.5 $ $Date: 2003/09/29 22:02:33 $
|
||||
* @version $Revision: 1.6 $ $Date: 2003/11/02 16:29:12 $
|
||||
*
|
||||
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
|
||||
* @author James Strachan
|
||||
*/
|
||||
public class ProxyIterator implements Iterator {
|
||||
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
/*
|
||||
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/ProxyListIterator.java,v 1.5 2003/09/29 22:02:33 scolebourne Exp $
|
||||
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/ProxyListIterator.java,v 1.6 2003/11/02 16:29:12 scolebourne Exp $
|
||||
* ====================================================================
|
||||
*
|
||||
* The Apache Software License, Version 1.1
|
||||
|
|
@ -63,9 +63,9 @@ import java.util.ListIterator;
|
|||
* A proxy {@link ListIterator ListIterator} which delegates its
|
||||
* methods to a proxy instance.
|
||||
*
|
||||
* @see ProxyIterator
|
||||
* @deprecated Use AbstractListIteratorDecorator
|
||||
* @since Commons Collections 2.0
|
||||
* @version $Revision: 1.5 $ $Date: 2003/09/29 22:02:33 $
|
||||
* @version $Revision: 1.6 $ $Date: 2003/11/02 16:29:12 $
|
||||
*
|
||||
* @author Rodney Waldhoff
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
/*
|
||||
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/TransformIterator.java,v 1.5 2003/09/29 22:02:33 scolebourne Exp $
|
||||
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/iterators/TransformIterator.java,v 1.6 2003/11/02 16:29:12 scolebourne Exp $
|
||||
* ====================================================================
|
||||
*
|
||||
* The Apache Software License, Version 1.1
|
||||
|
|
@ -58,24 +58,26 @@
|
|||
package org.apache.commons.collections.iterators;
|
||||
|
||||
import java.util.Iterator;
|
||||
|
||||
import org.apache.commons.collections.Transformer;
|
||||
|
||||
/**
|
||||
* A Proxy {@link Iterator Iterator} which uses a {@link Transformer Transformer}
|
||||
* instance to transform the contents of the {@link Iterator Iterator} into
|
||||
* some other form.
|
||||
* Decorates an iterator such that each element returned is transformed.
|
||||
*
|
||||
* @since Commons Collections 1.0
|
||||
* @version $Revision: 1.5 $ $Date: 2003/09/29 22:02:33 $
|
||||
* @version $Revision: 1.6 $ $Date: 2003/11/02 16:29:12 $
|
||||
*
|
||||
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
|
||||
* @author James Strachan
|
||||
* @author Stephen Colebourne
|
||||
*/
|
||||
public class TransformIterator extends ProxyIterator {
|
||||
public class TransformIterator implements Iterator {
|
||||
|
||||
/** Holds value of property transformer. */
|
||||
/** The iterator being used */
|
||||
private Iterator iterator;
|
||||
/** The transformer being used */
|
||||
private Transformer transformer;
|
||||
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Constructs a new <code>TransformIterator</code> that will not function
|
||||
* until the {@link #setIterator(Iterator) setIterator} method is
|
||||
|
|
@ -92,7 +94,8 @@ public class TransformIterator extends ProxyIterator {
|
|||
* @param iterator the iterator to use
|
||||
*/
|
||||
public TransformIterator(Iterator iterator) {
|
||||
super(iterator);
|
||||
super();
|
||||
this.iterator = iterator;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -104,50 +107,83 @@ public class TransformIterator extends ProxyIterator {
|
|||
* @param transformer the transformer to use
|
||||
*/
|
||||
public TransformIterator(Iterator iterator, Transformer transformer) {
|
||||
super(iterator);
|
||||
super();
|
||||
this.iterator = iterator;
|
||||
this.transformer = transformer;
|
||||
}
|
||||
|
||||
// Iterator interface
|
||||
//-------------------------------------------------------------------------
|
||||
public Object next() {
|
||||
return transform( super.next() );
|
||||
//-----------------------------------------------------------------------
|
||||
public boolean hasNext() {
|
||||
return iterator.hasNext();
|
||||
}
|
||||
|
||||
// Properties
|
||||
//-------------------------------------------------------------------------
|
||||
/**
|
||||
* Getter for property transformer.
|
||||
* Gets the next object from the iteration, transforming it using the
|
||||
* current transformer. If the transformer is null, no transformation
|
||||
* occurs and the object from the iterator is returned directly.
|
||||
*
|
||||
* @return Value of property transformer.
|
||||
* @return the next object
|
||||
* @throws NoSuchElementException if there are no more elements
|
||||
*/
|
||||
public Object next() {
|
||||
return transform(iterator.next());
|
||||
}
|
||||
|
||||
public void remove() {
|
||||
iterator.remove();
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Gets the iterator this iterator is using.
|
||||
*
|
||||
* @return the iterator.
|
||||
*/
|
||||
public Iterator getIterator() {
|
||||
return iterator;
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the iterator for this iterator to use.
|
||||
* If iteration has started, this effectively resets the iterator.
|
||||
*
|
||||
* @param iterator the iterator to use
|
||||
*/
|
||||
public void setIterator(Iterator iterator) {
|
||||
this.iterator = iterator;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Gets the transformer this iterator is using.
|
||||
*
|
||||
* @return the transformer.
|
||||
*/
|
||||
public Transformer getTransformer() {
|
||||
return transformer;
|
||||
}
|
||||
|
||||
/**
|
||||
* Setter for property transformer.
|
||||
* Sets the transformer this the iterator to use.
|
||||
* A null transformer is a no-op transformer.
|
||||
*
|
||||
* @param transformer New value of property transformer.
|
||||
* @param transformer the transformer to use
|
||||
*/
|
||||
public void setTransformer(Transformer transformer) {
|
||||
this.transformer = transformer;
|
||||
}
|
||||
|
||||
// Implementation methods
|
||||
//-------------------------------------------------------------------------
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
/**
|
||||
* Transforms the given object using the transformer. If the
|
||||
* transformer is null, the original object is returned as-is.
|
||||
* Transforms the given object using the transformer.
|
||||
* If the transformer is null, the original object is returned as-is.
|
||||
*
|
||||
* @param source the object to transform
|
||||
* @return the transformed object
|
||||
*/
|
||||
protected Object transform( Object source ) {
|
||||
Transformer transformer = getTransformer();
|
||||
if ( transformer != null ) {
|
||||
return transformer.transform( source );
|
||||
protected Object transform(Object source) {
|
||||
if (transformer != null) {
|
||||
return transformer.transform(source);
|
||||
}
|
||||
return source;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue