/*
* 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.compress;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Streamable;
import java.io.IOException;
import java.util.Arrays;
/**
*
*/
public class CompressedString implements Streamable {
private byte[] bytes;
CompressedString() {
}
/**
* Constructor assuming the data provided is compressed (UTF8). It uses the provided
* array without copying it.
*/
public CompressedString(byte[] compressed) {
this.bytes = compressed;
}
public CompressedString(BytesReference data) throws IOException {
Compressor compressor = CompressorFactory.compressor(data);
if (compressor != null) {
// already compressed...
this.bytes = data.toBytes();
} else {
BytesArray bytesArray = data.toBytesArray();
this.bytes = CompressorFactory.defaultCompressor().compress(bytesArray.array(), bytesArray.arrayOffset(), bytesArray.length());
}
}
/**
* Constructs a new compressed string, assuming the bytes are UTF8, by copying it over.
*
* @param data The byte array
* @param offset Offset into the byte array
* @param length The length of the data
* @throws IOException
*/
public CompressedString(byte[] data, int offset, int length) throws IOException {
Compressor compressor = CompressorFactory.compressor(data, offset, length);
if (compressor != null) {
// already compressed...
this.bytes = Arrays.copyOfRange(data, offset, offset + length);
} else {
// default to LZF
this.bytes = CompressorFactory.defaultCompressor().compress(data, offset, length);
}
}
public CompressedString(String str) throws IOException {
BytesRef result = new BytesRef(str);
this.bytes = CompressorFactory.defaultCompressor().compress(result.bytes, result.offset, result.length);
}
public byte[] compressed() {
return this.bytes;
}
public byte[] uncompressed() throws IOException {
Compressor compressor = CompressorFactory.compressor(bytes);
return compressor.uncompress(bytes, 0, bytes.length);
}
public String string() throws IOException {
return new BytesRef(uncompressed()).utf8ToString();
}
public static CompressedString readCompressedString(StreamInput in) throws IOException {
CompressedString compressedString = new CompressedString();
compressedString.readFrom(in);
return compressedString;
}
@Override
public void readFrom(StreamInput in) throws IOException {
bytes = new byte[in.readVInt()];
in.readBytes(bytes, 0, bytes.length);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeVInt(bytes.length);
out.writeBytes(bytes);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CompressedString that = (CompressedString) o;
if (!Arrays.equals(bytes, that.bytes)) return false;
return true;
}
@Override
public int hashCode() {
return bytes != null ? Arrays.hashCode(bytes) : 0;
}
@Override
public String toString() {
try {
return string();
} catch (IOException e) {
return "_na_";
}
}
}