org.elasticsearch.util.io.stream.BytesStreamInput Maven / Gradle / Ivy
/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.util.io.stream;
import org.elasticsearch.util.Unicode;
import java.io.EOFException;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
public class BytesStreamInput extends StreamInput {
protected byte buf[];
protected int pos;
protected int count;
public BytesStreamInput(byte buf[]) {
this.buf = buf;
this.pos = 0;
this.count = buf.length;
}
@Override public byte readByte() throws IOException {
if (pos >= count) {
throw new EOFException();
}
return buf[pos++];
}
@Override public void readBytes(byte[] b, int offset, int len) throws IOException {
if (pos >= count) {
throw new EOFException();
}
if (pos + len > count) {
len = count - pos;
}
if (len <= 0) {
throw new EOFException();
}
System.arraycopy(buf, pos, b, offset, len);
pos += len;
}
@Override public String readUTF() throws IOException {
int length = readVInt();
if (pos + length > count) {
throw new EOFException();
}
String str = Unicode.fromBytes(buf, pos, length);
pos += length;
return str;
}
@Override public void reset() throws IOException {
pos = 0;
}
@Override public void close() throws IOException {
// nothing to do here...
}
}