001/* 002 * Copyright 2002-2014 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.core.type.filter; 018 019import org.springframework.util.ClassUtils; 020 021/** 022 * A simple filter which matches classes that are assignable to a given type. 023 * 024 * @author Rod Johnson 025 * @author Mark Fisher 026 * @author Ramnivas Laddad 027 * @since 2.5 028 */ 029public class AssignableTypeFilter extends AbstractTypeHierarchyTraversingFilter { 030 031 private final Class<?> targetType; 032 033 034 /** 035 * Create a new AssignableTypeFilter for the given type. 036 * @param targetType the type to match 037 */ 038 public AssignableTypeFilter(Class<?> targetType) { 039 super(true, true); 040 this.targetType = targetType; 041 } 042 043 044 @Override 045 protected boolean matchClassName(String className) { 046 return this.targetType.getName().equals(className); 047 } 048 049 @Override 050 protected Boolean matchSuperClass(String superClassName) { 051 return matchTargetType(superClassName); 052 } 053 054 @Override 055 protected Boolean matchInterface(String interfaceName) { 056 return matchTargetType(interfaceName); 057 } 058 059 protected Boolean matchTargetType(String typeName) { 060 if (this.targetType.getName().equals(typeName)) { 061 return true; 062 } 063 else if (Object.class.getName().equals(typeName)) { 064 return false; 065 } 066 else if (typeName.startsWith("java")) { 067 try { 068 Class<?> clazz = ClassUtils.forName(typeName, getClass().getClassLoader()); 069 return this.targetType.isAssignableFrom(clazz); 070 } 071 catch (Throwable ex) { 072 // Class not regularly loadable - can't determine a match that way. 073 } 074 } 075 return null; 076 } 077 078}