Java tutorial
/* * Copyright 2006-2014 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.kordamp.ezmorph.object; import org.apache.commons.lang.builder.HashCodeBuilder; import org.kordamp.ezmorph.MorphException; import org.kordamp.ezmorph.MorpherRegistry; import org.kordamp.ezmorph.ObjectMorpher; import java.util.HashMap; import java.util.Map; /** * An all-purpose Morpher that can morph to several classes.<br> * Because this Morpher accepts any class and morphs to Object it should not be * added to a MorpherRegistry as it may be too generic for some cases and may * result in unwanted transformations. * * @author Andres Almiray */ public class SwitchingMorpher implements ObjectMorpher { private Map<Class<?>, Class<?>> classMap = new HashMap<Class<?>, Class<?>>(); private MorpherRegistry morpherRegistry; public SwitchingMorpher(Map<Class<?>, Class<?>> classMap, MorpherRegistry morpherRegistry) { this.morpherRegistry = morpherRegistry; if (classMap == null || classMap.isEmpty()) { throw new MorphException("Must specify at least one mapping"); } this.classMap.putAll(classMap); } public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null) { return false; } if (!(obj instanceof SwitchingMorpher)) { return false; } SwitchingMorpher other = (SwitchingMorpher) obj; if (classMap.size() != other.classMap.size()) { return false; } for (Map.Entry<Class<?>, Class<?>> entry : classMap.entrySet()) { if (!other.classMap.containsKey(entry.getKey())) { return false; } if (!entry.getValue().equals(other.classMap.get(entry.getKey()))) { return false; } } return true; } public int hashCode() { HashCodeBuilder builder = new HashCodeBuilder(); for (Map.Entry<Class<?>, Class<?>> entry : classMap.entrySet()) { builder.append(entry.getKey()); builder.append(entry.getValue()); } return builder.toHashCode(); } public Object morph(Object value) { if (value == null) { return null; } Class target = (Class) classMap.get(value.getClass()); return morpherRegistry.morph(target, value); } public Class<?> morphsTo() { return Object.class; } public boolean supports(Class<?> clazz) { return true; } }