com.emc.codec.compression.deflate.DeflateCodec Maven / Gradle / Ivy

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/*
 * Copyright (c) 2015, EMC Corporation.
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * + Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * + Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * + The name of EMC Corporation may not be used to endorse or promote
 * products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

package com.emc.codec.compression.deflate;

import com.emc.codec.AbstractCodec;
import com.emc.codec.EncodeInputStream;
import com.emc.codec.EncodeOutputStream;
import com.emc.codec.compression.CompressionConstants;
import com.emc.codec.compression.CompressionMetadata;
import com.emc.codec.compression.CompressionUtil;
import com.emc.codec.util.CodecUtil;

import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import java.util.zip.InflaterInputStream;
import java.util.zip.InflaterOutputStream;

public class DeflateCodec extends AbstractCodec {
    public static final String SUBSPEC = "Deflate";
    public static final int PRIORITY = 100;

    public static String encodeSpec(int compressionLevel) {
        return CompressionUtil.getEncodeSpec(SUBSPEC, compressionLevel);
    }

    @Override
    public boolean canProcess(String encodeSpec) {
        String algorithm = CodecUtil.getEncodeAlgorithm(encodeSpec);
        return CompressionConstants.COMPRESSION_TYPE.equals(CodecUtil.getEncodeType(encodeSpec))
                && algorithm != null && algorithm.startsWith(SUBSPEC);
    }

    @Override
    public String getDefaultEncodeSpec() {
        return encodeSpec(CompressionConstants.DEFAULT_COMPRESSION_LEVEL);
    }

    @Override
    public int getPriority() {
        return PRIORITY;
    }

    @Override
    public CompressionMetadata createEncodeMetadata(String encodeSpec, Map metaMap) {
        return new CompressionMetadata(encodeSpec, metaMap);
    }

    @Override
    public long getDecodedSize(CompressionMetadata metadata) {
        return metadata.getOriginalSize();
    }

    @Override
    public OutputStream getDecodingStream(OutputStream originalStream, CompressionMetadata encodeInfo,
                                          Map codecProperties) {
        return new InflaterOutputStream(originalStream);
    }

    @Override
    public InputStream getDecodingStream(InputStream originalStream, CompressionMetadata encodeInfo,
                                         Map codecProperties) {
        return new InflaterInputStream(originalStream);
    }

    @Override
    public boolean isSizePredictable() {
        return false;
    }

    @Override
    public long getEncodedSize(long originalSize, String encodeSpec, Map codecProperties) {
        throw new UnsupportedOperationException("compressed size is unpredictable");
    }

    @Override
    public EncodeOutputStream getEncodingStream(OutputStream originalStream, String encodeSpec,
                                                                     Map codecProperties) {
        if (!canEncode(encodeSpec)) throw new IllegalArgumentException("cannot process " + encodeSpec);
        int compressionLevel = CompressionUtil.getCompressionLevel(encodeSpec, CompressionConstants.DEFAULT_COMPRESSION_LEVEL);
        return new DeflateOutputStream(originalStream, encodeSpec, compressionLevel);
    }

    @Override
    public EncodeInputStream getEncodingStream(InputStream originalStream, String encodeSpec,
                                                                    Map codecProperties) {
        if (!canEncode(encodeSpec)) throw new IllegalArgumentException("cannot process " + encodeSpec);
        int compressionLevel = CompressionUtil.getCompressionLevel(encodeSpec, CompressionConstants.DEFAULT_COMPRESSION_LEVEL);
        return new DeflateInputStream(originalStream, encodeSpec, compressionLevel);
    }
}