001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau.transform; 014 015import static org.apache.juneau.internal.ClassUtils.*; 016 017import java.lang.reflect.*; 018import java.util.*; 019 020import org.apache.juneau.*; 021import org.apache.juneau.annotation.*; 022import org.apache.juneau.parser.*; 023import org.apache.juneau.reflect.*; 024import org.apache.juneau.serializer.*; 025 026/** 027 * Specialized {@link PojoSwap} for {@link Surrogate} classes. 028 * 029 * @param <T> The class type that this transform applies to. 030 * @param <F> The transformed class type. 031 */ 032public class SurrogateSwap<T,F> extends PojoSwap<T,F> { 033 034 private Constructor<F> constructor; // public F(T t); 035 private Method unswapMethod; // public T build(); 036 037 /** 038 * Constructor. 039 * 040 * @param forClass The normal class. 041 * @param constructor The constructor on the surrogate class that takes the normal class as a parameter. 042 * @param unswapMethod The static method that converts surrogate objects into normal objects. 043 */ 044 protected SurrogateSwap(Class<T> forClass, Constructor<F> constructor, Method unswapMethod) { 045 super(forClass, constructor.getDeclaringClass()); 046 this.constructor = constructor; 047 this.unswapMethod = unswapMethod; 048 } 049 050 /** 051 * Given the specified surrogate class, return the list of POJO swaps. 052 * 053 * <p> 054 * A transform is returned for each public 1-arg constructor found. 055 * Returns an empty list if no public 1-arg constructors are found. 056 * 057 * @param c The surrogate class. 058 * @return The list of POJO swaps that apply to this class. 059 */ 060 @SuppressWarnings({"unchecked", "rawtypes"}) 061 public static List<SurrogateSwap<?,?>> findPojoSwaps(Class<?> c) { 062 List<SurrogateSwap<?,?>> l = new LinkedList<>(); 063 ClassInfo ci = getClassInfo(c); 064 for (ConstructorInfo cc : ci.getPublicConstructors()) { 065 if (cc.getAnnotation(BeanIgnore.class) == null && cc.hasNumParams(1) && cc.isPublic()) { 066 Class<?> pt = cc.getRawParamType(0); 067 if (! pt.equals(c.getDeclaringClass())) { 068 // Find the unswap method if there is one. 069 Method unswapMethod = null; 070 for (MethodInfo m : ci.getPublicMethods()) { 071 if (m.getReturnType().is(pt) && m.isPublic()) 072 unswapMethod = m.inner(); 073 } 074 075 l.add(new SurrogateSwap(pt, cc.inner(), unswapMethod)); 076 } 077 } 078 } 079 return l; 080 } 081 082 @Override /* PojoSwap */ 083 public F swap(BeanSession session, T o) throws SerializeException { 084 try { 085 return constructor.newInstance(o); 086 } catch (Exception e) { 087 throw new SerializeException(e); 088 } 089 } 090 091 @Override /* PojoSwap */ 092 @SuppressWarnings("unchecked") 093 public T unswap(BeanSession session, F f, ClassMeta<?> hint) throws ParseException { 094 if (unswapMethod == null) 095 throw new ParseException("unswap() method not implement on surrogate class ''{1}''", 096 f.getClass().getName(), getNormalClass().getFullName()); 097 try { 098 return (T)unswapMethod.invoke(f); 099 } catch (Exception e) { 100 throw new ParseException(e); 101 } 102 } 103}