/*
* 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.transport.netty;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.bytes.ChannelBufferBytesReference;
import org.elasticsearch.common.io.stream.StreamInput;
import org.jboss.netty.buffer.ChannelBuffer;
import java.io.EOFException;
import java.io.IOException;
/**
* A Netty {@link org.jboss.netty.buffer.ChannelBuffer} based {@link org.elasticsearch.common.io.stream.StreamInput}.
*/
public class ChannelBufferStreamInput extends StreamInput {
private final ChannelBuffer buffer;
private final int startIndex;
private final int endIndex;
public ChannelBufferStreamInput(ChannelBuffer buffer) {
this(buffer, buffer.readableBytes());
}
public ChannelBufferStreamInput(ChannelBuffer buffer, int length) {
if (length > buffer.readableBytes()) {
throw new IndexOutOfBoundsException();
}
this.buffer = buffer;
startIndex = buffer.readerIndex();
endIndex = startIndex + length;
buffer.markReaderIndex();
}
@Override
public BytesReference readBytesReference(int length) throws IOException {
ChannelBufferBytesReference ref = new ChannelBufferBytesReference(buffer.slice(buffer.readerIndex(), length));
buffer.skipBytes(length);
return ref;
}
@Override
public BytesRef readBytesRef(int length) throws IOException {
if (!buffer.hasArray()) {
return super.readBytesRef(length);
}
BytesRef bytesRef = new BytesRef(buffer.array(), buffer.arrayOffset() + buffer.readerIndex(), length);
buffer.skipBytes(length);
return bytesRef;
}
@Override
public int available() throws IOException {
return endIndex - buffer.readerIndex();
}
@Override
public void mark(int readlimit) {
buffer.markReaderIndex();
}
@Override
public boolean markSupported() {
return true;
}
@Override
public int read() throws IOException {
if (available() == 0) {
return -1;
}
return buffer.readByte() & 0xff;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (len == 0) {
return 0;
}
int available = available();
if (available == 0) {
return -1;
}
len = Math.min(available, len);
buffer.readBytes(b, off, len);
return len;
}
@Override
public void reset() throws IOException {
buffer.resetReaderIndex();
}
@Override
public long skip(long n) throws IOException {
if (n > Integer.MAX_VALUE) {
return skipBytes(Integer.MAX_VALUE);
} else {
return skipBytes((int) n);
}
}
public int skipBytes(int n) throws IOException {
int nBytes = Math.min(available(), n);
buffer.skipBytes(nBytes);
return nBytes;
}
@Override
public byte readByte() throws IOException {
return buffer.readByte();
}
@Override
public void readBytes(byte[] b, int offset, int len) throws IOException {
int read = read(b, offset, len);
if (read < len) {
throw new EOFException();
}
}
@Override
public void close() throws IOException {
// nothing to do here
}
}