001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // 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 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.util.io; 016 017 import java.io.IOException; 018 import java.io.InputStream; 019 import java.io.ObjectInputStream; 020 import java.io.ObjectStreamClass; 021 022 import org.apache.hivemind.ClassResolver; 023 import org.apache.hivemind.util.Defense; 024 025 /** 026 * Specialized subclass of {@link java.io.ObjectInputStream}that knows how to resolve classes with 027 * a non-default class loader (represented by an instance of 028 * {@link org.apache.hivemind.ClassResolver}). 029 * 030 * @author Howard Lewis Ship 031 * @since 3.0 032 */ 033 034 public class ResolvingObjectInputStream extends ObjectInputStream 035 { 036 private ClassResolver _resolver; 037 038 public ResolvingObjectInputStream(ClassResolver resolver, InputStream input) throws IOException 039 { 040 super(input); 041 042 Defense.notNull(resolver, "resolver"); 043 044 _resolver = resolver; 045 } 046 047 /** 048 * Overrides the default implementation to have the resource resolver find the class. 049 */ 050 051 protected Class resolveClass(ObjectStreamClass v) throws IOException, ClassNotFoundException 052 { 053 return _resolver.findClass(v.getName()); 054 } 055 }