1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.commons.proxy.factory.util; 19 20 import java.lang.reflect.Method; 21 import java.lang.reflect.Modifier; 22 import java.util.Collection; 23 import java.util.HashMap; 24 import java.util.HashSet; 25 import java.util.Iterator; 26 import java.util.Map; 27 import java.util.Set; 28 29 /** 30 * A useful superclass for {@link ProxyClassGenerator} implementations. 31 * 32 * @author James Carman 33 * @since 1.0 34 */ 35 public abstract class AbstractProxyClassGenerator implements ProxyClassGenerator 36 { 37 //---------------------------------------------------------------------------------------------------------------------- 38 // Static Methods 39 //---------------------------------------------------------------------------------------------------------------------- 40 41 /** 42 * Returns all methods that a proxy class must implement from the proxy interfaces. This method makes sure there 43 * are no method signature clashes. For methods with the same signature (name and parameter types), the one 44 * encountered first will be returned in the result. Final methods are also excluded from the result. 45 * 46 * @param proxyClasses the interfaces the proxy class must implement 47 * @return all methods that the proxy class must implement 48 */ 49 public static Method[] getImplementationMethods( Class[] proxyClasses ) 50 { 51 final Map signatureMethodMap = new HashMap(); 52 final Set finalizedSignatures = new HashSet(); 53 for( int i = 0; i < proxyClasses.length; i++ ) 54 { 55 Class proxyInterface = proxyClasses[i]; 56 final Method[] methods = proxyInterface.getMethods(); 57 for( int j = 0; j < methods.length; j++ ) 58 { 59 final MethodSignature signature = new MethodSignature( methods[j] ); 60 if( Modifier.isFinal( methods[j].getModifiers() ) ) 61 { 62 finalizedSignatures.add( signature ); 63 } 64 else if( !signatureMethodMap.containsKey( signature ) ) 65 { 66 signatureMethodMap.put( signature, methods[j] ); 67 } 68 } 69 } 70 final Collection resultingMethods = signatureMethodMap.values(); 71 for( Iterator i = finalizedSignatures.iterator(); i.hasNext(); ) 72 { 73 MethodSignature signature = ( MethodSignature ) i.next(); 74 resultingMethods.remove( signatureMethodMap.get( signature ) ); 75 } 76 return ( Method[] ) resultingMethods.toArray( new Method[resultingMethods.size()] ); 77 } 78 } 79