001/*
002 * Copyright 2002-2017 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.serializer;
018
019import java.io.IOException;
020import java.io.InputStream;
021import java.io.ObjectInputStream;
022
023import org.springframework.core.ConfigurableObjectInputStream;
024import org.springframework.core.NestedIOException;
025import org.springframework.lang.Nullable;
026
027/**
028 * A default {@link Deserializer} implementation that reads an input stream
029 * using Java serialization.
030 *
031 * @author Gary Russell
032 * @author Mark Fisher
033 * @author Juergen Hoeller
034 * @since 3.0.5
035 * @see ObjectInputStream
036 */
037public class DefaultDeserializer implements Deserializer<Object> {
038
039        @Nullable
040        private final ClassLoader classLoader;
041
042
043        /**
044         * Create a {@code DefaultDeserializer} with default {@link ObjectInputStream}
045         * configuration, using the "latest user-defined ClassLoader".
046         */
047        public DefaultDeserializer() {
048                this.classLoader = null;
049        }
050
051        /**
052         * Create a {@code DefaultDeserializer} for using an {@link ObjectInputStream}
053         * with the given {@code ClassLoader}.
054         * @since 4.2.1
055         * @see ConfigurableObjectInputStream#ConfigurableObjectInputStream(InputStream, ClassLoader)
056         */
057        public DefaultDeserializer(@Nullable ClassLoader classLoader) {
058                this.classLoader = classLoader;
059        }
060
061
062        /**
063         * Read from the supplied {@code InputStream} and deserialize the contents
064         * into an object.
065         * @see ObjectInputStream#readObject()
066         */
067        @Override
068        @SuppressWarnings("resource")
069        public Object deserialize(InputStream inputStream) throws IOException {
070                ObjectInputStream objectInputStream = new ConfigurableObjectInputStream(inputStream, this.classLoader);
071                try {
072                        return objectInputStream.readObject();
073                }
074                catch (ClassNotFoundException ex) {
075                        throw new NestedIOException("Failed to deserialize object type", ex);
076                }
077        }
078
079}