/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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 com.facebook.presto.jdbc.internal.netty.handler.codec.serialization;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import com.facebook.presto.jdbc.internal.netty.buffer.ChannelBuffer;
import com.facebook.presto.jdbc.internal.netty.buffer.ChannelBufferOutputStream;
import com.facebook.presto.jdbc.internal.netty.buffer.ChannelBuffers;
/**
* An {@link ObjectOutput} which is interoperable with {@link ObjectDecoder}
* and {@link ObjectDecoderInputStream}.
*/
public class ObjectEncoderOutputStream extends OutputStream implements
ObjectOutput {
private final DataOutputStream out;
private final int estimatedLength;
/**
* Creates a new {@link ObjectOutput} with the estimated length of 512
* bytes.
*
* @param out
* the {@link OutputStream} where the serialized form will be
* written out
*/
public ObjectEncoderOutputStream(OutputStream out) {
this(out, 512);
}
/**
* Creates a new {@link ObjectOutput}.
*
* @param out
* the {@link OutputStream} where the serialized form will be
* written out
*
* @param estimatedLength
* the estimated byte length of the serialized form of an object.
* If the length of the serialized form exceeds this value, the
* internal buffer will be expanded automatically at the cost of
* memory bandwidth. If this value is too big, it will also waste
* memory bandwidth. To avoid unnecessary memory copy or allocation
* cost, please specify the properly estimated value.
*/
public ObjectEncoderOutputStream(OutputStream out, int estimatedLength) {
if (out == null) {
throw new NullPointerException("out");
}
if (estimatedLength < 0) {
throw new IllegalArgumentException("estimatedLength: " + estimatedLength);
}
if (out instanceof DataOutputStream) {
this.out = (DataOutputStream) out;
} else {
this.out = new DataOutputStream(out);
}
this.estimatedLength = estimatedLength;
}
public void writeObject(Object obj) throws IOException {
ChannelBufferOutputStream bout = new ChannelBufferOutputStream(
ChannelBuffers.dynamicBuffer(estimatedLength));
ObjectOutputStream oout = new CompactObjectOutputStream(bout);
oout.writeObject(obj);
oout.flush();
oout.close();
ChannelBuffer buffer = bout.buffer();
int objectSize = buffer.readableBytes();
writeInt(objectSize);
buffer.getBytes(0, this, objectSize);
}
@Override
public void write(int b) throws IOException {
out.write(b);
}
@Override
public void close() throws IOException {
out.close();
}
@Override
public void flush() throws IOException {
out.flush();
}
public final int size() {
return out.size();
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
out.write(b, off, len);
}
@Override
public void write(byte[] b) throws IOException {
out.write(b);
}
public final void writeBoolean(boolean v) throws IOException {
out.writeBoolean(v);
}
public final void writeByte(int v) throws IOException {
out.writeByte(v);
}
public final void writeBytes(String s) throws IOException {
out.writeBytes(s);
}
public final void writeChar(int v) throws IOException {
out.writeChar(v);
}
public final void writeChars(String s) throws IOException {
out.writeChars(s);
}
public final void writeDouble(double v) throws IOException {
out.writeDouble(v);
}
public final void writeFloat(float v) throws IOException {
out.writeFloat(v);
}
public final void writeInt(int v) throws IOException {
out.writeInt(v);
}
public final void writeLong(long v) throws IOException {
out.writeLong(v);
}
public final void writeShort(int v) throws IOException {
out.writeShort(v);
}
public final void writeUTF(String str) throws IOException {
out.writeUTF(str);
}
}