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Uses inheritence in the get() value lookup to decide which value to return. 

I find this very useful when implementing registries of which Class acts
upon which value. So in a ConvertUtils class, a ClassMap would handle the
many Converters, deciding which Converter to use on which value.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@130852 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Henri Yandell 2002-10-23 03:35:23 +00:00
parent 628285d5a7
commit 8fe3197c56
2 changed files with 292 additions and 0 deletions
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174
src/java/org/apache/commons/collections/ClassMap.java Normal file
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/*
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/Attic/ClassMap.java,v 1.1 2002/10/23 03:35:23 bayard Exp $
* $Revision: 1.1 $
* $Date: 2002/10/23 03:35:23 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 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 acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements 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 Group.
*
* 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/>.
*
*/
package org.apache.commons.collections;
import java.util.Map;
import java.util.HashMap;
/**
* A map which stores objects by a key Class.
* When obtaining the object, it will check inheritence and
* interface trees to see if the Class matches.
*
* @author <a href="mailto:bayard@apache.org">Henri Yandell</a>
*/
public class ClassMap extends ProxyMap {
/**
* Create a ClassMap around a passed in Map.
*/
static public Map wrap(Map m) {
return new ClassMap(m);
}
/**
* Construct a ClassMap using a default internal Map of a
* HashMap.
*/
public ClassMap() {
this(new HashMap());
}
private ClassMap(Map m) {
super(m);
}
/**
* Get the object from the map. If the key is not
* a Class object, then it uses the Class of the object.
* Inheritence is used to decide which value to return, so
* if a value is not in the map for the Class of the passed
* in key, then it checks the inheritence tree of the Class
* by first checking the interface tree and then checking
* the superclass.
*/
public Object get(Object key) {
if(key == null) {
return null;
}
Class clss = null;
if(key instanceof Class) {
clss = (Class)key;
} else {
clss = key.getClass();
}
Object obj = super.get(clss);
if(obj == null) {
// if this is null, let's go up the inheritence tree
obj = getInterfaces(clss);
if(obj == null) {
obj = getSuperclass(clss);
}
}
return obj;
}
private Object getInterfaces(Class clss) {
if(clss == null) {
return null;
}
Object obj = null;
Class[] interfaces = clss.getInterfaces();
for(int i=0; i<interfaces.length; i++) {
obj = (Object)super.get(interfaces[i]);
if(obj != null) {
return obj;
}
obj = getInterfaces(interfaces[i]);
if(obj != null) {
return obj;
}
obj = getSuperclass(interfaces[i]);
if(obj != null) {
return obj;
}
}
return null;
}
private Object getSuperclass(Class clss) {
if(clss == null) {
return null;
}
Object obj = null;
Class superclass = clss.getSuperclass();
obj = (Object)super.get(superclass);
if(obj != null) {
return obj;
}
obj = getInterfaces(superclass);
if(obj != null) {
return obj;
}
obj = getSuperclass(superclass);
if(obj != null) {
return obj;
}
return null;
}
}

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src/test/org/apache/commons/collections/TestClassMap.java Normal file
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/*
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/test/org/apache/commons/collections/Attic/TestClassMap.java,v 1.1 2002/10/23 03:35:22 bayard Exp $
* $Revision: 1.1 $
* $Date: 2002/10/23 03:35:22 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2001 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 acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements 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 Group.
*
* 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/>.
*
*/
package org.apache.commons.collections;
import java.util.Map;
import junit.framework.*;
/**
* Test cases for ClassMap
*
* @author <a href="mailto:bayard@apache.org">Henri Yandell</a>
*/
public class TestClassMap extends TestMap {
public TestClassMap(String testName) {
super(testName);
}
public static Test suite() {
return BulkTest.makeSuite(TestClassMap.class);
}
public Object[] getSampleKeys() {
Object[] keys = new Object[] {
Integer.TYPE,
Class.class,
Integer.class,
Double.TYPE,
Number.class,
String.class,
java.util.Date.class
};
return keys;
}
public Object[] getSampleValues() {
Object[] values = new Object[] {
"int",
"Class",
"Integer",
"double",
"Number",
"String",
"java.util.Date"
};
return values;
}
public Map makeEmptyMap() {
return new ClassMap();
}
public void testClassMapInheritenceGet() {
ClassMap map = (ClassMap)makeFullMap();
assertTrue(map.get(java.util.Date.class) == map.get(java.sql.Date.class));
assertTrue(map.get(Number.class) != map.get(Integer.class));
}
}