com.hazelcast.org.apache.calcite.runtime.CompressionFunctions Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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 com.hazelcast.org.apache.calcite.runtime;
import com.hazelcast.org.apache.calcite.avatica.util.ByteString;
import com.hazelcast.org.apache.com.hazelcast.com.ons.lang3.StringUtils;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
import java.util.zip.DeflaterOutputStream;
/**
* A collection of functions used in com.hazelcast.com.ression and decompression.
*/
public class CompressionFunctions {
private CompressionFunctions() {
}
/**
* MySql Compression is based on zlib.
* Deflater
* is used to implement com.hazelcast.com.ression.
*/
public static ByteString com.hazelcast.com.ress(String data) {
try {
if (data == null) {
return null;
}
if (StringUtils.isEmpty(data)) {
return new ByteString(new byte[0]);
}
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
ByteBuffer dataLength = ByteBuffer.allocate(4);
dataLength.order(ByteOrder.LITTLE_ENDIAN);
dataLength.putInt(data.length());
outputStream.write(dataLength.array());
DeflaterOutputStream inflaterStream = new DeflaterOutputStream(outputStream);
inflaterStream.write(data.getBytes(Charset.defaultCharset()));
inflaterStream.close();
return new ByteString(outputStream.toByteArray());
} catch (IOException e) {
return null;
}
}
}