/*
* Copyright 2013 Cloudera Inc.
*
* 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
*
* 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.kitesdk.morphline.tika.decompress;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import org.apache.commons.compress.compressors.CompressorException;
import org.apache.commons.compress.compressors.CompressorInputStream;
import org.apache.commons.compress.compressors.CompressorStreamFactory;
import org.apache.commons.compress.compressors.gzip.GzipUtils;
import org.apache.tika.io.CloseShieldInputStream;
import org.apache.tika.mime.MediaType;
import org.kitesdk.morphline.api.Command;
import org.kitesdk.morphline.api.CommandBuilder;
import org.kitesdk.morphline.api.MorphlineContext;
import org.kitesdk.morphline.api.MorphlineRuntimeException;
import org.kitesdk.morphline.api.Record;
import org.kitesdk.morphline.base.Fields;
import org.kitesdk.morphline.stdio.AbstractParser;
import org.kitesdk.morphline.shaded.com.google.common.io.Closeables;
import com.typesafe.config.Config;
/**
* Command that decompresses the first attachment. Implementation adapted from Tika CompressorParser.
*/
public final class DecompressBuilder implements CommandBuilder {
@Override
public Collection<String> getNames() {
return Collections.singletonList("decompress");
}
@Override
public Command build(Config config, Command parent, Command child, MorphlineContext context) {
return new Decompress(this, config, parent, child, context);
}
///////////////////////////////////////////////////////////////////////////////
// Nested classes:
///////////////////////////////////////////////////////////////////////////////
private static final class Decompress extends AbstractParser {
private boolean decompressConcatenated = false; // TODO remove as obsolete
private static final MediaType BZIP = MediaType.application("x-bzip");
private static final MediaType BZIP2 = MediaType.application("x-bzip2");
private static final MediaType GZIP = MediaType.application("x-gzip");
private static final MediaType XZ = MediaType.application("x-xz");
private static final MediaType PACK = MediaType.application("application/x-java-pack200");
private static final Set<MediaType> SUPPORTED_TYPES =
MediaType.set(BZIP, BZIP2, GZIP, XZ, PACK);
public Decompress(CommandBuilder builder, Config config, Command parent, Command child, MorphlineContext context) {
super(builder, config, parent, child, context);
if (!config.hasPath(SUPPORTED_MIME_TYPES)) {
// for (MediaType mediaType : new CompressorParser().getSupportedTypes(new ParseContext())) {
for (MediaType mediaType : SUPPORTED_TYPES) {
addSupportedMimeType(mediaType.toString());
}
}
validateArguments();
}
@Override
protected boolean doProcess(Record record, InputStream stream) {
EmbeddedExtractor extractor = new EmbeddedExtractor();
String name = (String) record.getFirstValue(Fields.ATTACHMENT_NAME);
if (name != null) {
if (name.endsWith(".tbz")) {
name = name.substring(0, name.length() - 4) + ".tar";
} else if (name.endsWith(".tbz2")) {
name = name.substring(0, name.length() - 5) + ".tar";
} else if (name.endsWith(".bz")) {
name = name.substring(0, name.length() - 3);
} else if (name.endsWith(".bz2")) {
name = name.substring(0, name.length() - 4);
} else if (name.endsWith(".xz")) {
name = name.substring(0, name.length() - 3);
} else if (name.endsWith(".pack")) {
name = name.substring(0, name.length() - 5);
} else if (name.length() > 0) {
name = GzipUtils.getUncompressedFilename(name);
}
}
// At the end we want to close the compression stream to release
// any associated resources, but the underlying document stream
// should not be closed
stream = new CloseShieldInputStream(stream);
// Ensure that the stream supports the mark feature
stream = new BufferedInputStream(stream);
CompressorInputStream cis;
try {
CompressorStreamFactory factory = new CompressorStreamFactory();
cis = factory.createCompressorInputStream(stream);
} catch (CompressorException e) {
throw new MorphlineRuntimeException("Unable to uncompress document stream", e);
}
try {
return extractor.parseEmbedded(cis, record, name, getChild());
} finally {
Closeables.closeQuietly(cis);
}
}
}
}