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JPPF, the open source grid computing solution
/*
* JPPF.
* Copyright (C) 2005-2015 JPPF Team.
* http://www.jppf.org
*
* Licensed 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.jppf.serialization;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import org.jppf.io.IO;
/**
* Utility methods for serializing and deserializing data
* @author Laurent Cohen
* @exclude
*/
public final class SerializationUtils
{
/**
* Instantiation of this class is not permitted.
*/
private SerializationUtils()
{
}
/**
* Serialize an int value into an array of bytes.
* @param value the int value to serialize.
* @return an array of bytes filled with the value's representation.
*/
public static byte[] writeInt(final int value)
{
//return writeInt(value, new byte[4], 0);
return writeInt(value, IO.LENGTH_BUFFER_POOL.get(), 0);
}
/**
* Serialize an int value into an array of bytes.
* @param value the int value to serialize.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return an array of bytes filled with the value's representation, starting at the specified offset.
*/
public static byte[] writeBoolean(final boolean value, final byte[] data, final int offset)
{
data[offset] = value ? (byte) 1 : 0;
return data;
}
/**
* Serialize an int value into an array of bytes.
* @param value the int value to serialize.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return an array of bytes filled with the value's representation, starting at the specified offset.
*/
public static byte[] writeChar(final char value, final byte[] data, final int offset)
{
int pos = offset;
data[pos++] = (byte) ((value >>> 8) & 0xFF);
data[pos++] = (byte) ((value ) & 0xFF);
return data;
}
/**
* Serialize an int value into an array of bytes.
* @param value the int value to serialize.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return an array of bytes filled with the value's representation, starting at the specified offset.
*/
public static byte[] writeShort(final short value, final byte[] data, final int offset)
{
int pos = offset;
data[pos++] = (byte) ((value >>> 8) & 0xFF);
data[pos++] = (byte) ((value ) & 0xFF);
return data;
}
/**
* Serialize an int value into an array of bytes.
* @param value the int value to serialize.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return an array of bytes filled with the value's representation, starting at the specified offset.
*/
public static byte[] writeInt(final int value, final byte[] data, final int offset)
{
int pos = offset;
data[pos++] = (byte) ((value >>> 24) & 0xFF);
data[pos++] = (byte) ((value >>> 16) & 0xFF);
data[pos++] = (byte) ((value >>> 8) & 0xFF);
data[pos++] = (byte) ((value ) & 0xFF);
return data;
}
/**
* Serialize a long value into an array of bytes.
* @param value the int value to serialize.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return an array of bytes filled with the value's representation, starting at the specified offset.
*/
public static byte[] writeLong(final long value, final byte[] data, final int offset)
{
int pos = offset;
data[pos++] = (byte) ((value >>> 56) & 0xFF);
data[pos++] = (byte) ((value >>> 48) & 0xFF);
data[pos++] = (byte) ((value >>> 40) & 0xFF);
data[pos++] = (byte) ((value >>> 32) & 0xFF);
data[pos++] = (byte) ((value >>> 24) & 0xFF);
data[pos++] = (byte) ((value >>> 16) & 0xFF);
data[pos++] = (byte) ((value >>> 8) & 0xFF);
data[pos++] = (byte) ((value ) & 0xFF);
return data;
}
/**
* Serialize an int value to a stream.
* @param value the int value to serialize.
* @param os the stream to write to.
* @throws IOException if an error occurs while writing the data.
*/
public static void writeInt(final int value, final OutputStream os) throws IOException
{
os.write((byte) ((value >>> 24) & 0xFF));
os.write((byte) ((value >>> 16) & 0xFF));
os.write((byte) ((value >>> 8) & 0xFF));
os.write((byte) ((value ) & 0xFF));
}
/**
* Write an integer value to a channel.
* @param channel the channel to write to.
* @param value the value to write.
* @throws IOException if an error occurs while writing the data.
*/
public static void writeInt(final WritableByteChannel channel, final int value) throws IOException
{
ByteBuffer buf = ByteBuffer.allocate(4);
buf.putInt(value);
buf.flip();
int count = 0;
while (count < 4)
{
int n = 0;
while (n == 0) n = channel.write(buf);
if (n < 0) throw new ClosedChannelException();
count += n;
}
}
/**
* Read an integer value from a channel.
* @param channel the channel to read from.
* @return the value read from the channel.
* @throws IOException if an error occurs while reading the data.
*/
public static int readInt(final ReadableByteChannel channel) throws IOException
{
ByteBuffer buf = ByteBuffer.allocate(4);
int count = 0;
while (count < 4)
{
int n = 0;
while (n == 0) n = channel.read(buf);
if (n < 0) throw new ClosedChannelException();
count += n;
}
buf.flip();
return buf.getInt();
}
/**
* Deserialize an int value from an array of bytes.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return the int value read from the array of bytes
*/
public static boolean readBoolean(final byte[] data, final int offset)
{
return data[offset] != 0;
}
/**
* Deserialize an int value from an array of bytes.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return the int value read from the array of bytes
*/
public static char readChar(final byte[] data, final int offset)
{
int pos = offset;
int result = (data[pos++] & 0xFF) << 8;
result += (data[pos++] & 0xFF);
return (char) result;
}
/**
* Deserialize an int value from an array of bytes.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return the int value read from the array of bytes
*/
public static short readShort(final byte[] data, final int offset)
{
int pos = offset;
int result = (data[pos++] & 0xFF) << 8;
result += (data[pos++] & 0xFF);
return (short) result;
}
/**
* Deserialize an int value from an array of bytes.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return the int value read from the array of bytes
*/
public static int readInt(final byte[] data, final int offset)
{
int pos = offset;
int result = (data[pos++] & 0xFF) << 24;
result += (data[pos++] & 0xFF) << 16;
result += (data[pos++] & 0xFF) << 8;
result += (data[pos++] & 0xFF);
return result;
}
/**
* Deserialize an int value from an array of bytes.
* @param data the array of bytes into which to serialize the value.
* @param offset the position in the array of byte at which the serialization should start.
* @return the int value read from the array of bytes
*/
public static long readLong(final byte[] data, final int offset)
{
int pos = offset;
long result = (long) (data[pos++] & 0xFF) << 56;
result += (long) (data[pos++] & 0xFF) << 48;
result += (long) (data[pos++] & 0xFF) << 40;
result += (long) (data[pos++] & 0xFF) << 32;
result += (long) (data[pos++] & 0xFF) << 24;
result += (long) (data[pos++] & 0xFF) << 16;
result += (long) (data[pos++] & 0xFF) << 8;
result += (data[pos++] & 0xFF);
return result;
}
/**
* Deserialize an int value from a stream.
* @param is the stream to read from.
* @return the int value read from the stream.
* @throws IOException if an error occurs while reading the data.
*/
public static int readInt(final InputStream is) throws IOException
{
int result = (is.read() & 0xFF) << 24;
result += (is.read() & 0xFF) << 16;
result += (is.read() & 0xFF) << 8;
result += (is.read() & 0xFF);
return result;
}
/**
* Deserialize an int value from a stream.
* @param is the stream to read from.
* @return the int value read from the stream.
* @throws IOException if an error occurs while reading the data.
*/
public static long readLong(final InputStream is) throws IOException
{
long result = (long) (is.read() & 0xFF) << 56;
result += (long) (is.read() & 0xFF) << 48;
result += (long) (is.read() & 0xFF) << 40;
result += (long) (is.read() & 0xFF) << 32;
result += (long) (is.read() & 0xFF) << 24;
result += (long) (is.read() & 0xFF) << 16;
result += (long) (is.read() & 0xFF) << 8;
result += (is.read() & 0xFF);
return result;
}
}
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