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/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.apache.river.api.io; import java.io.IOException; import java.io.InputStream; import java.io.ObjectInputStream; import java.security.AccessController; import java.security.PrivilegedAction; /** * PortableObjectInputStream, an extension to Java serialization that allows * for immutable and safely constructed objects * * @author Peter. * @since 3.0.0 */ public class PortableObjectInputStream extends ObjectInputStream { public static ObjectInputStream create(InputStream in) throws IOException{ PortableObjectInputStream result = new PortableObjectInputStream(in); AccessController.doPrivileged(new EnableResolveObject(result)); return result; } /** * Caller must have SerializablePermission("enableSubstitution") to call * this method. * * @param in * @throws IOException */ protected PortableObjectInputStream(InputStream in) throws IOException{ super(in); } private void enableResolveObject(){ super.enableResolveObject(true); } protected Object resolveObject(Object o) throws IOException{ if (o instanceof PortableFactory) return ((PortableFactory)o).create(); return o; } private static class EnableResolveObject implements PrivilegedAction{ private final PortableObjectInputStream in; EnableResolveObject(PortableObjectInputStream in){ this.in = in; } @Override public Object run() { in.enableResolveObject(); return null; } } }