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

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Here is the source code for org.springframework.amqp.support.postprocessor.ZipPostProcessor.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.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * A post processor that uses a {@link ZipOutputStream} 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 ZipPostProcessor extends AbstractDeflaterPostProcessor {

    public ZipPostProcessor() {
        super();
    }

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

    @Override
    protected OutputStream getCompressorStream(OutputStream zipped) throws IOException {
        ZipOutputStream zipper = new SettableLevelZipOutputStream(zipped, getLevel());
        zipper.putNextEntry(new ZipEntry("amqp"));
        return zipper;
    }

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

    private static final class SettableLevelZipOutputStream extends ZipOutputStream {

        SettableLevelZipOutputStream(OutputStream zipped, int level) {
            super(zipped);
            this.setLevel(level);
        }

    }

}