bayard 2002/10/22 20:35:23 Added: collections/src/test/org/apache/commons/collections TestClassMap.java collections/src/java/org/apache/commons/collections ClassMap.java Log: 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. Revision Changes Path 1.1 jakarta-commons/collections/src/test/org/apache/commons/collections/TestClassMap.java Index: TestClassMap.java =================================================================== /* * $Header: /home/cvs/jakarta-commons/collections/src/test/org/apache/commons/collections/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 [EMAIL PROTECTED] * * 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)); } } 1.1 jakarta-commons/collections/src/java/org/apache/commons/collections/ClassMap.java Index: ClassMap.java =================================================================== /* * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/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 [EMAIL PROTECTED] * * 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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