com.bigdata.io.SerializerUtil Maven / Gradle / Ivy
/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
[email protected]
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Feb 12, 2007
*/
package com.bigdata.io;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.nio.ByteBuffer;
/**
* Helper utilities for (de-)serialization of {@link Serializable} objects using
* the Java serialization mechanisms.
*
* @author Bryan Thompson
* @version $Id$
*/
public class SerializerUtil {
/**
* An {@link IStreamSerializer} that uses java default serialization.
*/
public static final IStreamSerializer STREAMS = new IStreamSerializer() {
/**
*
*/
private static final long serialVersionUID = -2625456835905636703L;
public Object deserialize(ObjectInput in) {
try {
return in.readObject();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
public void serialize(ObjectOutput out, Object obj) {
try {
out.writeObject(obj);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
/**
* Always returns the same reference.
*/
private Object readResolve() throws ObjectStreamException {
return STREAMS;
}
private void writeObject(java.io.ObjectOutputStream out)
throws IOException {
// NOP
}
private void readObject(java.io.ObjectInputStream in)
throws IOException, ClassNotFoundException {
// NOP
}
};
/**
* An {@link IRecordSerializer} wrapper for the static methods declared by
* the {@link SerializerUtil}.
*/
public static final IRecordSerializer RECORDS = new IRecordSerializer() {
/**
*
*/
private static final long serialVersionUID = -2625456835905636703L;
public Object deserialize(byte[] data) {
return SerializerUtil.deserialize(data);
}
public byte[] serialize(Object obj) {
return SerializerUtil.serialize(obj);
}
/**
* Always returns the same reference.
*/
private Object readResolve() throws ObjectStreamException {
return RECORDS;
}
private void writeObject(java.io.ObjectOutputStream out)
throws IOException {
// NOP
}
private void readObject(java.io.ObjectInputStream in)
throws IOException, ClassNotFoundException {
// NOP
}
};
/**
* Serialize an object using the Java serialization mechanisms.
*
* @param obj
* A {@link Serializable} object.
*
* @return The serialized object state.
*/
static final public byte[] serialize(final Object obj) {
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
final ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(obj);
oos.flush();
oos.close();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
return baos.toByteArray();
}
/**
* De-serialize an object using the Java serialization mechanisms.
*
* @param b
* A byte[] containing a serialized object.
*
* @return The de-serialized object -or- null iff the byte[]
* reference is null.
*/
static final public Object deserialize(byte[] b) {
if (b == null)
return null;
return deserialize(b, 0, b.length);
}
/**
* De-serialize an object using the Java serialization mechanisms.
*
* @param b
* A byte[] containing a serialized object.
* @param off
* The offset of the first byte to de-serialize.
* @param len
* The #of bytes in the object record.
*
* @return The de-serialized object.
*/
static final public Object deserialize(final byte[] b, final int off, final int len) {
final ByteArrayInputStream bais = new ByteArrayInputStream(b, off, len);
try {
final ObjectInputStream ois = new ObjectInputStream(bais);
return ois.readObject();
} catch (Exception ex) {
/*
* Note: an error here is often an attempt to deserialize an empty
* byte[].
*/
throw new RuntimeException("off=" + off + ", len=" + len, ex);
}
}
/**
* De-serialize an object using the Java serialization mechanisms.
*
* @param is
* The input stream from which to read the serialized data.
*
* @return The de-serialized object.
*/
static final public Object deserialize(final InputStream is) {
try {
final ObjectInputStream ois = new ObjectInputStream(is);
return ois.readObject();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
/**
* De-serialize an object using the Java serialization mechanisms.
*
* @param buf
* A buffer containing a serialized object. The bytes from
* {@link ByteBuffer#position()} to {@link ByteBuffer#limit()}
* will be de-serialized and the position will be advanced to the
* limit.
*
* @return The de-serialized object.
*/
static final public Object deserialize(final ByteBuffer buf) {
if (true && buf.hasArray()) {
final int off = buf.arrayOffset() + buf.position();
final int len = buf.remaining();
final Object ret = deserialize(buf.array(), off, len);
buf.position(buf.limit());
return ret;
}
final ByteBufferInputStream bais = new ByteBufferInputStream(buf);
try {
final ObjectInputStream ois = new ObjectInputStream(bais);
return ois.readObject();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
}
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