org.springframework.amqp.support.postprocessor.GZipPostProcessor.java Source code

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Here is the source code for org.springframework.amqp.support.postprocessor.GZipPostProcessor.java

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/*
 * Copyright 2014-2019 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.springframework.amqp.support.postprocessor;

import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.GZIPOutputStream;

/**
 * A post processor that uses a {@link GZIPOutputStream} to compress the message body.
 * Sets {@link org.springframework.amqp.core.MessageProperties#SPRING_AUTO_DECOMPRESS} to
 * true by default.
 *
 * @author Gary Russell
 * @since 1.4.2
 */
public class GZipPostProcessor extends AbstractDeflaterPostProcessor {

    public GZipPostProcessor() {
        super();
    }

    public GZipPostProcessor(boolean autoDecompress) {
        super(autoDecompress);
    }

    @Override
    protected OutputStream getCompressorStream(OutputStream zipped) throws IOException {
        return new SettableLevelGZIPOutputStream(zipped, getLevel());
    }

    @Override
    protected String getEncoding() {
        return "gzip";
    }

    private static final class SettableLevelGZIPOutputStream extends GZIPOutputStream {

        SettableLevelGZIPOutputStream(OutputStream out, int level) throws IOException {
            super(out);
            this.def.setLevel(level);
        }

    }

}