/**
* Copyright (c) 2012, The National Archives <pronom@nationalarchives.gsi.gov.uk>
* All rights reserved.
*
* 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.
*
* * Neither the name of the The National Archives nor the
* names of its contributors may 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 HOLDER 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 uk.gov.nationalarchives.droid.command.archive;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URI;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.apache.commons.compress.compressors.gzip.GzipUtils;
import uk.gov.nationalarchives.droid.command.ResultPrinter;
import uk.gov.nationalarchives.droid.command.action.CommandExecutionException;
import uk.gov.nationalarchives.droid.container.ContainerSignatureDefinitions;
import uk.gov.nationalarchives.droid.core.BinarySignatureIdentifier;
import uk.gov.nationalarchives.droid.core.interfaces.IdentificationRequest;
import uk.gov.nationalarchives.droid.core.interfaces.IdentificationResultCollection;
import uk.gov.nationalarchives.droid.core.interfaces.RequestIdentifier;
import uk.gov.nationalarchives.droid.core.interfaces.resource.GZipIdentificationRequest;
import uk.gov.nationalarchives.droid.core.interfaces.resource.RequestMetaData;
/**
* Identifier for files held in a GZIP archive.
*
* @author rbrennan
*/
public class GZipArchiveContentIdentifier {
private static final long SIZE = 12L;
private static final long TIME = 13L;
private BinarySignatureIdentifier binarySignatureIdentifier;
private ContainerSignatureDefinitions containerSignatureDefinitions;
private String path;
private String slash;
private String slash1;
private File tmpDir;
/**
*
* @param binarySignatureIdentifier binary signature identifier
* @param containerSignatureDefinitions container signatures
* @param path current archive path
* @param slash local path element delimiter
* @param slash1 local first container prefix delimiter
*/
public GZipArchiveContentIdentifier(final BinarySignatureIdentifier binarySignatureIdentifier,
final ContainerSignatureDefinitions containerSignatureDefinitions,
final String path, final String slash, final String slash1) {
synchronized (this) {
this.binarySignatureIdentifier = binarySignatureIdentifier;
this.containerSignatureDefinitions = containerSignatureDefinitions;
this.path = path;
this.slash = slash;
this.slash1 = slash1;
if (tmpDir == null) {
tmpDir = new File(System.getProperty("java.io.tmpdir"));
}
}
}
/**
* @param uri The URI of the file to identify
* @param request The Identification Request
* @throws CommandExecutionException When an exception happens during execution
* @throws CommandExecutionException When an exception happens during archive file input/output
*/
public final void identify(final URI uri, final IdentificationRequest request)
throws CommandExecutionException {
final String newPath = "gzip:" + slash1 + path + request.getFileName() + "!" + slash;
slash1 = "";
final URI newUri = URI.create(GzipUtils.getUncompressedFilename(uri.toString()));
final RequestIdentifier identifier = new RequestIdentifier(newUri);
final RequestMetaData metaData = new RequestMetaData(SIZE, TIME, uri.getPath());
final GZipIdentificationRequest gzRequest = new GZipIdentificationRequest(
metaData, identifier, tmpDir);
GzipCompressorInputStream gzin = null;
try {
gzin = new GzipCompressorInputStream(
new FileInputStream(request.getSourceFile()));
gzRequest.open(gzin);
final IdentificationResultCollection gzResults =
binarySignatureIdentifier.matchBinarySignatures(gzRequest);
final ResultPrinter resultPrinter = new ResultPrinter(binarySignatureIdentifier,
containerSignatureDefinitions, newPath, slash, slash1, true);
resultPrinter.print(gzResults, gzRequest);
} catch (IOException ioe) {
System.err.println(ioe + " (" + newPath + ")"); // continue after corrupt archive
} finally {
if (gzin != null) {
try {
gzin.close();
} catch (IOException ioe) {
throw new CommandExecutionException(ioe.getMessage(), ioe);
}
}
}
}
}