org.apache.commons.lang.SerializationUtils Maven / Gradle / Ivy
/*
* 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.commons.lang;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
/**
* Assists with the serialization process and performs additional functionality based
* on serialization.
*
*
* - Deep clone using serialization
*
- Serialize managing finally and IOException
*
- Deserialize managing finally and IOException
*
*
* This class throws exceptions for invalid null inputs.
* Each method documents its behaviour in more detail.
*
* @author Nissim Karpenstein
* @author Janek Bogucki
* @author Daniel L. Rall
* @author Stephen Colebourne
* @author Jeff Varszegi
* @author Gary Gregory
* @since 1.0
* @version $Id: SerializationUtils.java 512889 2007-02-28 18:18:20Z dlr $
*/
public class SerializationUtils {
/**
* SerializationUtils instances should NOT be constructed in standard programming.
* Instead, the class should be used as SerializationUtils.clone(object).
*
* This constructor is public to permit tools that require a JavaBean instance
* to operate.
* @since 2.0
*/
public SerializationUtils() {
super();
}
// Clone
//-----------------------------------------------------------------------
/**
* Deep clone an Object using serialization.
*
* This is many times slower than writing clone methods by hand
* on all objects in your object graph. However, for complex object
* graphs, or for those that don't support deep cloning this can
* be a simple alternative implementation. Of course all the objects
* must be Serializable.
*
* @param object the Serializable object to clone
* @return the cloned object
* @throws SerializationException (runtime) if the serialization fails
*/
public static Object clone(Serializable object) {
return deserialize(serialize(object));
}
// Serialize
//-----------------------------------------------------------------------
/**
* Serializes an Object to the specified stream.
*
* The stream will be closed once the object is written.
* This avoids the need for a finally clause, and maybe also exception
* handling, in the application code.
*
* The stream passed in is not buffered internally within this method.
* This is the responsibility of your application if desired.
*
* @param obj the object to serialize to bytes, may be null
* @param outputStream the stream to write to, must not be null
* @throws IllegalArgumentException if outputStream is null
* @throws SerializationException (runtime) if the serialization fails
*/
public static void serialize(Serializable obj, OutputStream outputStream) {
if (outputStream == null) {
throw new IllegalArgumentException("The OutputStream must not be null");
}
ObjectOutputStream out = null;
try {
// stream closed in the finally
out = new ObjectOutputStream(outputStream);
out.writeObject(obj);
} catch (IOException ex) {
throw new SerializationException(ex);
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException ex) {
// ignore close exception
}
}
}
/**
* Serializes an Object to a byte array for
* storage/serialization.
*
* @param obj the object to serialize to bytes
* @return a byte[] with the converted Serializable
* @throws SerializationException (runtime) if the serialization fails
*/
public static byte[] serialize(Serializable obj) {
ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
serialize(obj, baos);
return baos.toByteArray();
}
// Deserialize
//-----------------------------------------------------------------------
/**
* Deserializes an Object from the specified stream.
*
* The stream will be closed once the object is written. This
* avoids the need for a finally clause, and maybe also exception
* handling, in the application code.
*
* The stream passed in is not buffered internally within this method.
* This is the responsibility of your application if desired.
*
* @param inputStream the serialized object input stream, must not be null
* @return the deserialized object
* @throws IllegalArgumentException if inputStream is null
* @throws SerializationException (runtime) if the serialization fails
*/
public static Object deserialize(InputStream inputStream) {
if (inputStream == null) {
throw new IllegalArgumentException("The InputStream must not be null");
}
ObjectInputStream in = null;
try {
// stream closed in the finally
in = new ObjectInputStream(inputStream);
return in.readObject();
} catch (ClassNotFoundException ex) {
throw new SerializationException(ex);
} catch (IOException ex) {
throw new SerializationException(ex);
} finally {
try {
if (in != null) {
in.close();
}
} catch (IOException ex) {
// ignore close exception
}
}
}
/**
* Deserializes a single Object from an array of bytes.
*
* @param objectData the serialized object, must not be null
* @return the deserialized object
* @throws IllegalArgumentException if objectData is null
* @throws SerializationException (runtime) if the serialization fails
*/
public static Object deserialize(byte[] objectData) {
if (objectData == null) {
throw new IllegalArgumentException("The byte[] must not be null");
}
ByteArrayInputStream bais = new ByteArrayInputStream(objectData);
return deserialize(bais);
}
}