Added Daniel Rall's SequencedHashMap patch and ported the JUnit test case over to use assertTrue() rather than assert().
git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@130501 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
James Strachan
parent
f9f92677a9
commit
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package org.apache.commons.collections;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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||||||
|
* are met:
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|
*
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|
* 1. Redistributions of source code must retain the above copyright
|
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* notice, this list of conditions and the following disclaimer.
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|
*
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|
* 2. Redistributions in binary form must reproduce the above copyright
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|
* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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|
* distribution.
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*
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|
* 3. The end-user documentation included with the redistribution,
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|
* if any, must include the following acknowledgment:
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|
* "This product includes software developed by the
|
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|
* Apache Software Foundation (http://www.apache.org/)."
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|
* Alternately, this acknowledgment may appear in the software itself,
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|
* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache Turbine" must not be used to endorse or promote products
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|
* derived from this software without prior written permission. For
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|
* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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|
* "Apache Turbine", nor may "Apache" appear in their name, without
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|
* prior written permission of the Apache Software Foundation.
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|
*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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||||||
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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/**
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* <p>A {@link java.util.HashMap} whose keys are sequenced. The
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* sequencing of the keys allow easy access to the values in the order
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* which they were added in. This class is thread safe.</p>
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*
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* <p>Implementing the List interface is not possible due to a instance
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* method name clash between the Collection and the List interface:
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*
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* <table>
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* <tr><td>Collections</td><td>boolean remove(Object o)</td></tr>
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* <tr><td>Lists</td><td>Object remove(Object o)</td></tr>
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* </table>
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* </p>
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*
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* <p>So one cannot implement both interfaces at the same, which is
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* unfortunate because the List interface would be very nice in
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* conjuction with <a
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* href="http://jakarta.apache.org/velocity/">Velocity</a>.</p>
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*
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* <p>A slightly more complex implementation and interface could involve
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* the use of a list of <code>Map.Entry</code> objects.</p>
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*
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* @author <a href="mailto:dlr@collab.net">Daniel Rall</a>
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* @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
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*/
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public class SequencedHashMap extends HashMap
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{
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/**
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* The index of the eldest element in the collection.
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*/
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protected static final int ELDEST_INDEX = 0;
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/**
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* Indicator for an unknown index.
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*/
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private static final int UNKNOWN_INDEX = -1;
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/**
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* The sequence used to keep track of the hash keys. Younger objects are
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* kept towards the end of the list. Does not allow duplicates.
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*/
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private LinkedList keySequence;
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/**
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* Creates a new instance with default storage.
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*/
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public SequencedHashMap ()
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{
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keySequence = new LinkedList();
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}
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/**
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* Creates a new instance with the specified storage.
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*
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* @param size The storage to allocate up front.
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*/
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public SequencedHashMap (int size)
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{
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super(size);
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keySequence = new LinkedList();
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}
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/**
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* Clears all elements.
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*/
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public void clear ()
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{
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super.clear();
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keySequence.clear();
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}
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/**
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* Creates a shallow copy of this object, preserving the internal
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* structure by copying only references. The keys, values, and
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* sequence are not <code>clone()</code>'d.
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*
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* @return A clone of this instance.
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*/
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public Object clone ()
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{
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SequencedHashMap seqHash = (SequencedHashMap) super.clone();
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seqHash.keySequence = (LinkedList) keySequence.clone();
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return seqHash;
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}
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/**
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* Returns the key at the specified index.
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*/
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public Object get (int index)
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{
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return keySequence.get(index);
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}
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/**
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* Returns the value at the specified index.
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*/
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public Object getValue (int index)
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{
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return get(get(index));
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}
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/**
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* Returns the index of the specified key.
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*/
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public int indexOf (Object key)
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{
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return keySequence.indexOf(key);
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}
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/**
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* Returns a key iterator.
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*/
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public Iterator iterator ()
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{
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return keySequence.iterator();
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}
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/**
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* Returns the last index of the specified key.
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*/
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public int lastIndexOf (Object key)
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{
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return keySequence.lastIndexOf(key);
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}
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/**
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* Returns the ordered sequence of keys.
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*
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* This method is meant to be used for retrieval of Key / Value pairs
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* in e.g. Velocity:
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* <PRE>
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* ## $table contains a sequenced hashtable
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* #foreach ($key in $table.sequence())
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* <TR>
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* <TD>Key: $key</TD>
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* </TD>Value: $table.get($key)</TD>
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* </TR>
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* #end
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* </PRE>
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*
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* @return The ordered list of keys.
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*/
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public List sequence()
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{
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return keySequence;
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}
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/**
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* Stores the provided key/value pair. Freshens the sequence of existing
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* elements.
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*
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* @param key The key to the provided value.
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* @param value The value to store.
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* @return The previous value for the specified key, or
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* <code>null</code> if none.
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*/
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public Object put (Object key, Object value)
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{
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Object prevValue = super.put(key, value);
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freshenSequence(key, prevValue);
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return prevValue;
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}
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/**
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* Freshens the sequence of the element <code>value</code> if
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* <code>value</code> is not <code>null</code>.
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*
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* @param key The key whose sequence to freshen.
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* @param value The value whose existance to check before removing the old
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* key sequence.
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*/
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protected void freshenSequence(Object key, Object value)
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{
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if (value != null)
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{
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// Freshening existing element's sequence.
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keySequence.remove(key);
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}
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keySequence.add(key);
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}
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/**
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* Stores the provided key/value pairs.
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*
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* @param t The key/value pairs to store.
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*/
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public void putAll (Map t)
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{
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Set set = t.entrySet();
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for (Iterator iter = set.iterator(); iter.hasNext(); )
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{
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Map.Entry e = (Map.Entry)iter.next();
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put(e.getKey(), e.getValue());
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}
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}
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/**
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* Removes the element at the specified index.
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*
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* @param index The index of the object to remove.
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* @return The previous value coressponding the <code>key</code>, or
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* <code>null</code> if none existed.
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*/
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public Object remove (int index)
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{
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return remove(index, null);
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}
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/**
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* Removes the element with the specified key.
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*
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* @param key The <code>Map</code> key of the object to remove.
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* @return The previous value coressponding the <code>key</code>, or
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* <code>null</code> if none existed.
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*/
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public Object remove (Object key)
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{
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return remove(UNKNOWN_INDEX, key);
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}
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/**
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* Removes the element with the specified key or index.
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*
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* @param index The index of the object to remove, or
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* <code>UNKNOWN_INDEX</code> if not known.
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* @param key The <code>Map</code> key of the object to remove.
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* @return The previous value coressponding the <code>key</code>, or
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* <code>null</code> if none existed.
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*/
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private final Object remove (int index, Object key)
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{
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if (index == UNKNOWN_INDEX)
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{
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index = indexOf(key);
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}
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if (key == null)
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{
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key = get(index);
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}
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if (index != UNKNOWN_INDEX)
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{
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keySequence.remove(index);
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}
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return super.remove(key);
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}
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}
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@ -1,7 +1,7 @@
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/*
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/*
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* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/test/org/apache/commons/collections/TestAll.java,v 1.11 2001/08/29 15:28:07 jstrachan Exp $
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* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/test/org/apache/commons/collections/TestAll.java,v 1.12 2001/09/17 16:43:49 jstrachan Exp $
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* $Revision: 1.11 $
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* $Revision: 1.12 $
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* $Date: 2001/08/29 15:28:07 $
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* $Date: 2001/09/17 16:43:49 $
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*
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*
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* ====================================================================
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* ====================================================================
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*
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*
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@ -66,7 +66,7 @@ import junit.framework.*;
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/**
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/**
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* Entry point for all Collections tests.
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* Entry point for all Collections tests.
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* @author Rodney Waldhoff
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* @author Rodney Waldhoff
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* @version $Id: TestAll.java,v 1.11 2001/08/29 15:28:07 jstrachan Exp $
|
* @version $Id: TestAll.java,v 1.12 2001/09/17 16:43:49 jstrachan Exp $
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*/
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*/
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public class TestAll extends TestCase {
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public class TestAll extends TestCase {
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public TestAll(String testName) {
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public TestAll(String testName) {
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@ -90,6 +90,7 @@ public class TestAll extends TestCase {
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suite.addTest(TestFastTreeMap1.suite());
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suite.addTest(TestFastTreeMap1.suite());
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suite.addTest(TestHashBag.suite());
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suite.addTest(TestHashBag.suite());
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suite.addTest(TestHashMap.suite());
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suite.addTest(TestHashMap.suite());
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suite.addTest(TestSequencedHashMap.suite());
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suite.addTest(TestSingletonIterator.suite());
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suite.addTest(TestSingletonIterator.suite());
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suite.addTest(TestTreeBag.suite());
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suite.addTest(TestTreeBag.suite());
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suite.addTest(TestTreeMap.suite());
|
suite.addTest(TestTreeMap.suite());
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|
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@ -0,0 +1,153 @@
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package org.apache.commons.collections;
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|
|
||||||
|
/* ====================================================================
|
||||||
|
* The Apache Software License, Version 1.1
|
||||||
|
*
|
||||||
|
* Copyright (c) 2001 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 acknowledgment:
|
||||||
|
* "This product includes software developed by the
|
||||||
|
* Apache Software Foundation (http://www.apache.org/)."
|
||||||
|
* Alternately, this acknowledgment may appear in the software itself,
|
||||||
|
* if and wherever such third-party acknowledgments normally appear.
|
||||||
|
*
|
||||||
|
* 4. The names "Apache" and "Apache Software Foundation" and
|
||||||
|
* "Apache Turbine" 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",
|
||||||
|
* "Apache Turbine", nor may "Apache" appear in their name, 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/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
import java.util.Iterator;
|
||||||
|
import java.util.HashMap;
|
||||||
|
import java.util.List;
|
||||||
|
import java.util.Map;
|
||||||
|
|
||||||
|
import junit.framework.Test;
|
||||||
|
import junit.framework.TestCase;
|
||||||
|
import junit.framework.TestSuite;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Unit tests {@link org.apache.commons.collections.SequencedHashMap}.
|
||||||
|
*
|
||||||
|
* @author <a href="mailto:dlr@collab.net">Daniel Rall</a>
|
||||||
|
* @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
|
||||||
|
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
|
||||||
|
*/
|
||||||
|
public class TestSequencedHashMap extends TestHashMap
|
||||||
|
{
|
||||||
|
/**
|
||||||
|
* The instance to experiment on.
|
||||||
|
*/
|
||||||
|
protected SequencedHashMap labRat;
|
||||||
|
|
||||||
|
public TestSequencedHashMap(String name) {
|
||||||
|
super(name);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static Test suite() {
|
||||||
|
return new TestSuite(TestSequencedHashMap.class);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void main(String[] args[]) {
|
||||||
|
String[] testCaseName = { TestSequencedHashMap.class.getName() };
|
||||||
|
junit.textui.TestRunner.main(testCaseName);
|
||||||
|
}
|
||||||
|
|
||||||
|
public void setUp() {
|
||||||
|
super.setUp();
|
||||||
|
labRat = new SequencedHashMap();
|
||||||
|
}
|
||||||
|
|
||||||
|
public Map makeMap() {
|
||||||
|
return new SequencedHashMap();
|
||||||
|
}
|
||||||
|
|
||||||
|
protected Object[] getKeys() {
|
||||||
|
return new Object[] { "foo", "baz", "eek" };
|
||||||
|
}
|
||||||
|
|
||||||
|
protected Object[] getValues() {
|
||||||
|
return new Object[] { "bar", "frob", new Object() };
|
||||||
|
}
|
||||||
|
|
||||||
|
public void testSequenceMap() throws Throwable {
|
||||||
|
Object[] keys = getKeys();
|
||||||
|
int expectedSize = keys.length;
|
||||||
|
Object[] values = getValues();
|
||||||
|
for (int i = 0; i < expectedSize; i++) {
|
||||||
|
labRat.put(keys[i], values[i]);
|
||||||
|
}
|
||||||
|
|
||||||
|
// Test size().
|
||||||
|
assertEquals("size() does not match expected size",
|
||||||
|
expectedSize, labRat.size());
|
||||||
|
|
||||||
|
// Test clone(), iterator(), and get(Object).
|
||||||
|
SequencedHashMap clone = (SequencedHashMap) labRat.clone();
|
||||||
|
assertEquals("Size of clone does not match original",
|
||||||
|
labRat.size(), clone.size());
|
||||||
|
Iterator origKeys = labRat.keySet().iterator();
|
||||||
|
Iterator copiedKeys = clone.keySet().iterator();
|
||||||
|
while (origKeys.hasNext()) {
|
||||||
|
Object origKey = origKeys.next();
|
||||||
|
Object copiedKey = copiedKeys.next();
|
||||||
|
assertEquals("Cloned key does not match orginal",
|
||||||
|
origKey, copiedKey);
|
||||||
|
assertEquals("Cloned value does not match original",
|
||||||
|
labRat.get(origKey), clone.get(copiedKey));
|
||||||
|
}
|
||||||
|
assertTrue("iterator() returned different number of elements than keys()",
|
||||||
|
!copiedKeys.hasNext());
|
||||||
|
|
||||||
|
// Test sequence()
|
||||||
|
List seq = labRat.sequence();
|
||||||
|
assertEquals("sequence() returns more keys than in the Map",
|
||||||
|
expectedSize, seq.size());
|
||||||
|
|
||||||
|
for (int i = 0; i < seq.size(); i++) {
|
||||||
|
assertEquals("Key " + i + " is not the same as the key in the Map",
|
||||||
|
keys[i], seq.get(i));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
protected void tearDown() {
|
||||||
|
labRat = null;
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue