/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.bytes;
import com.google.common.base.Charsets;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.common.io.Channels;
import org.elasticsearch.common.io.stream.BytesStreamInput;
import org.elasticsearch.common.io.stream.StreamInput;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.channels.GatheringByteChannel;
/**
* A bytes array reference that caches the hash code.
*/
public class HashedBytesArray implements BytesReference {
private final byte[] bytes;
/**
* Cache the hash code for the string
*/
private int hash; // Defaults to 0
public HashedBytesArray(byte[] bytes) {
this.bytes = bytes;
}
@Override
public byte get(int index) {
return bytes[index];
}
@Override
public int length() {
return bytes.length;
}
@Override
public BytesReference slice(int from, int length) {
if (from < 0 || (from + length) > bytes.length) {
throw new ElasticsearchIllegalArgumentException("can't slice a buffer with length [" + bytes.length + "], with slice parameters from [" + from + "], length [" + length + "]");
}
return new BytesArray(bytes, from, length);
}
@Override
public StreamInput streamInput() {
return new BytesStreamInput(bytes, false);
}
@Override
public void writeTo(OutputStream os) throws IOException {
os.write(bytes);
}
@Override
public void writeTo(GatheringByteChannel channel) throws IOException {
Channels.writeToChannel(bytes, 0, bytes.length, channel);
}
@Override
public byte[] toBytes() {
return bytes;
}
@Override
public BytesArray toBytesArray() {
return new BytesArray(bytes);
}
@Override
public BytesArray copyBytesArray() {
byte[] copy = new byte[bytes.length];
System.arraycopy(bytes, 0, copy, 0, bytes.length);
return new BytesArray(copy);
}
@Override
public ChannelBuffer toChannelBuffer() {
return ChannelBuffers.wrappedBuffer(bytes, 0, bytes.length);
}
@Override
public boolean hasArray() {
return true;
}
@Override
public byte[] array() {
return bytes;
}
@Override
public int arrayOffset() {
return 0;
}
@Override
public String toUtf8() {
if (bytes.length == 0) {
return "";
}
return new String(bytes, Charsets.UTF_8);
}
@Override
public BytesRef toBytesRef() {
return new BytesRef(bytes);
}
@Override
public BytesRef copyBytesRef() {
byte[] copy = new byte[bytes.length];
System.arraycopy(bytes, 0, copy, 0, bytes.length);
return new BytesRef(copy);
}
@Override
public int hashCode() {
if (hash == 0) {
hash = Helper.bytesHashCode(this);
}
return hash;
}
@Override
public boolean equals(Object obj) {
return Helper.bytesEqual(this, (BytesReference) obj);
}
}