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This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.
/*
* 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 java.io.IOException;
import java.util.Arrays;
/**
* Similar class to the {@link String} class except that it internally stores
* data using a compressed representation in order to require less permanent
* memory. Note that the compressed string might still sometimes need to be
* decompressed in order to perform equality checks or to compute hash codes.
*/
public final class CompressedString {
private final byte[] bytes;
private int hashCode;
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());
assert CompressorFactory.compressor(bytes) != null;
}
}
public CompressedString(byte[] data, int offset, int length) throws IOException {
this(new BytesArray(data, offset, length));
}
public CompressedString(byte[] data) throws IOException {
this(data, 0, data.length);
}
public CompressedString(String str) throws IOException {
this(new BytesArray(new BytesRef(str)));
}
/** Return the compressed bytes. */
public byte[] compressed() {
return this.bytes;
}
/** Return the uncompressed bytes. */
public byte[] uncompressed() {
Compressor compressor = CompressorFactory.compressor(bytes);
assert compressor != null;
try {
return compressor.uncompress(bytes, 0, bytes.length);
} catch (IOException e) {
throw new IllegalStateException("Cannot decompress compressed string", e);
}
}
public String string() throws IOException {
return new BytesRef(uncompressed()).utf8ToString();
}
public static CompressedString readCompressedString(StreamInput in) throws IOException {
byte[] bytes = new byte[in.readVInt()];
in.readBytes(bytes, 0, bytes.length);
return new CompressedString(bytes);
}
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(compressed(), that.compressed())) {
return true;
}
return Arrays.equals(uncompressed(), that.uncompressed());
}
@Override
public int hashCode() {
if (hashCode == 0) {
int h = Arrays.hashCode(uncompressed());
if (h == 0) {
h = 1;
}
hashCode = h;
}
return hashCode;
}
@Override
public String toString() {
try {
return string();
} catch (IOException e) {
return "_na_";
}
}
}