As suggested by LA_FORGE on mantis 781 (http://mantis.tokeek.de/view.php?id=781)pull/218/head
luccioman
6 years ago
parent
8ce9c066bf
commit
685122363d
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Licensing of XZ for Java
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========================
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All the files in this package have been written by Lasse Collin
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and/or Igor Pavlov. All these files have been put into the
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public domain. You can do whatever you want with these files.
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This software is provided "as is", without any warranty.
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// AbstractCompressorParser.java
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// ---------------------------
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// Copyright 2018 by luccioman; https://github.com/luccioman
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.document.parser;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.MalformedURLException;
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import java.util.Date;
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import java.util.Set;
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import org.apache.commons.compress.compressors.CompressorInputStream;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.document.id.MultiProtocolURL;
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import net.yacy.document.AbstractParser;
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import net.yacy.document.Document;
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import net.yacy.document.Parser;
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import net.yacy.document.TextParser;
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import net.yacy.document.VocabularyScraper;
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/**
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* Base class for parsing compressed files relying on Apache commons-compress
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* tools.
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*/
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public abstract class AbstractCompressorParser extends AbstractParser implements Parser {
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/** Crawl depth applied when parsing internal compressed content */
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protected static final int DEFAULT_DEPTH = 999;
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/**
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* @param name the human readable name of the parser
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*/
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public AbstractCompressorParser(final String name) {
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super(name);
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}
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/**
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* @param source an open input stream on a compressed source
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* @return a sub class of CompressorInputStream capable of uncompressing the source
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* on the fly
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* @throws IOException when an error occurred when trying to open the compressed
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* stream
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*/
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protected abstract CompressorInputStream createDecompressStream(final InputStream source) throws IOException;
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/**
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* Maps the given name of a compressed file to the name that the
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* file should have after uncompression. For example, for "file.txt.xz", "file.txt" is returned.
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*
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* @param filename name of a compressed file
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* @return name of the corresponding uncompressed file
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*/
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protected abstract String getUncompressedFilename(final String filename);
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@Override
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public Document[] parse(final DigestURL location, final String mimeType, final String charset,
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final Set<String> ignoreClassNames, final VocabularyScraper scraper, final int timezoneOffset,
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final InputStream source) throws Parser.Failure, InterruptedException {
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return parseWithLimits(location, mimeType, charset, scraper, timezoneOffset, source, Integer.MAX_VALUE,
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Long.MAX_VALUE);
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}
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@Override
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public Document[] parseWithLimits(final DigestURL location, final String mimeType, final String charset,
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final Set<String> ignoreClassNames, final VocabularyScraper scraper, final int timezoneOffset,
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final InputStream source, final int maxLinks, final long maxBytes) throws Parser.Failure {
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Document maindoc;
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final CompressorInputStream compressedInStream;
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try {
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compressedInStream = createDecompressStream(source);
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} catch (final IOException | RuntimeException e) {
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throw new Parser.Failure("Unexpected error while parsing compressed file. " + e.getMessage(), location);
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}
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try {
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// create maindoc for this archive, register with supplied url & mime
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maindoc = AbstractCompressorParser.createMainDocument(location, mimeType, charset, this);
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final Document[] docs = this.parseCompressedInputStream(location, null, ignoreClassNames, timezoneOffset,
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AbstractCompressorParser.DEFAULT_DEPTH, compressedInStream, maxLinks, maxBytes);
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if (docs != null) {
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maindoc.addSubDocuments(docs);
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if (docs.length > 0 && docs[0].isPartiallyParsed()) {
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maindoc.setPartiallyParsed(true);
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}
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}
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} catch (final Parser.Failure e) {
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throw e;
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} catch (final IOException | RuntimeException e) {
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throw new Parser.Failure("Unexpected error while parsing compressed file. " + e.getMessage(), location);
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}
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return new Document[] { maindoc };
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}
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/**
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* Create the main parsed document for the compressed document at the given URL
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* and Media type
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*
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* @param location the parsed resource URL
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* @param mimeType the media type of the resource
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* @param charset the charset name if known
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* @param parser an instance of CompressorParser that is registered as the
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* parser origin of the document
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* @return a Document instance
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*/
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protected static Document createMainDocument(final DigestURL location, final String mimeType, final String charset,
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final AbstractCompressorParser parser) {
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final String filename = location.getFileName();
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return new Document(location, mimeType, charset, parser, null, null,
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AbstractParser
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.singleList(filename.isEmpty() ? location.toTokens() : MultiProtocolURL.unescape(filename)), // title
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null, null, null, null, 0.0d, 0.0d, (Object) null, null, null, null, false, new Date());
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}
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/**
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* Parse content in an open stream uncompressing on the fly a compressed
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* resource.
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*
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* @param location the URL of the compressed resource
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* @param charset the charset name if known
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* @param ignoreClassNames an eventual set of CSS class names whose matching
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* html elements content should be ignored
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* @param timezoneOffset the local time zone offset
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* @param compressedInStream an open stream uncompressing on the fly the
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* compressed content
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* @param maxLinks the maximum total number of links to parse and add
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* to the result documents
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* @param maxBytes the maximum number of content bytes to process
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* @return a list of documents that result from parsing the source, with empty
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* or null text.
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* @throws Parser.Failure when the parser processing failed
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*/
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protected Document[] parseCompressedInputStream(final DigestURL location, final String charset,
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final Set<String> ignoreClassNames, final int timezoneOffset, final int depth,
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final CompressorInputStream compressedInStream, final int maxLinks, final long maxBytes) throws Failure {
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final String compressedFileName = location.getFileName();
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final String contentfilename = getUncompressedFilename(compressedFileName);
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final String mime = TextParser.mimeOf(MultiProtocolURL.getFileExtension(contentfilename));
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try {
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/*
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* Use the uncompressed file name for sub parsers to not unnecessarily use again
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* this same uncompressing parser
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*/
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final String locationPath = location.getPath();
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final String contentPath = locationPath.substring(0, locationPath.length() - compressedFileName.length())
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+ contentfilename;
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final DigestURL contentLocation = new DigestURL(location.getProtocol(), location.getHost(),
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location.getPort(), contentPath);
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/*
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* Rely on the supporting parsers to respect the maxLinks and maxBytes limits on
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* compressed content
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*/
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return TextParser.parseWithLimits(contentLocation, mime, charset, ignoreClassNames, timezoneOffset, depth,
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-1, compressedInStream, maxLinks, maxBytes);
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} catch (final MalformedURLException e) {
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throw new Parser.Failure("Unexpected error while parsing compressed file. " + e.getMessage(), location);
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}
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}
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@Override
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public boolean isParseWithLimitsSupported() {
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return true;
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}
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}
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@ -0,0 +1,66 @@
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// XZParser.java
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// ---------------------------
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// Copyright 2018 by luccioman; https://github.com/luccioman
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.document.parser;
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import java.io.IOException;
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import java.io.InputStream;
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import org.apache.commons.compress.compressors.CompressorInputStream;
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import org.apache.commons.compress.compressors.xz.XZCompressorInputStream;
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import org.apache.commons.compress.compressors.xz.XZUtils;
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import net.yacy.kelondro.util.MemoryControl;
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/**
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* Parser for xz archives. Uncompresses and parses the content and adds it to
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* the created main parsed document.
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*
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* @see <a href="https://tukaani.org/xz/format.html">xz file format website</a>
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*/
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public class XZParser extends AbstractCompressorParser {
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public XZParser() {
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super("XZ Compressed Archive Parser");
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this.SUPPORTED_EXTENSIONS.add("xz");
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this.SUPPORTED_EXTENSIONS.add("txz");
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this.SUPPORTED_MIME_TYPES.add("application/x-xz");
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}
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@Override
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protected CompressorInputStream createDecompressStream(final InputStream source) throws IOException {
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/*
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* Limit the size dedicated to reading compressed blocks to at most 25% of the
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* available memory. Eventual stricter limits should be handled by the caller
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* (see for example crawler.[protocol].maxFileSize configuration setting).
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*/
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final long availableMemory = MemoryControl.available();
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final long maxKBytes = (long) (availableMemory * 0.25 / 1024.0);
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return new XZCompressorInputStream(source, false, (int) Math.min(Integer.MAX_VALUE, maxKBytes));
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}
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@Override
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protected String getUncompressedFilename(final String filename) {
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return XZUtils.getUncompressedFilename(filename);
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}
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}
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@ -0,0 +1,246 @@
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// XZParserTest.java
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// ---------------------------
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// Copyright 2018 by luccioman; https://github.com/luccioman
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.document.parser;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertTrue;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertEquals;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.util.Collection;
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import org.junit.Test;
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import net.yacy.cora.document.id.AnchorURL;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.document.Document;
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import net.yacy.document.Parser.Failure;
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import net.yacy.document.VocabularyScraper;
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/**
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* Unit tests for the {@link XZParser} class
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*
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* @author luccioman
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*
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*/
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public class XZParserTest {
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/** Folder containing test files */
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private static final File TEST_FOLER = new File("test", "parsertest");
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/**
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* Unit test for the XZParser.parse() function with some small bzip2 test files.
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*
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* @throws Failure when a file could not be parsed
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* @throws InterruptedException when the test was interrupted before its
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* termination
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* @throws IOException when a read/write error occurred
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*/
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@Test
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public void testParse() throws Failure, InterruptedException, IOException {
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final String[] fileNames = { "umlaute_html_utf8.html.xz", "umlaute_linux.txt.xz" };
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final XZParser parser = new XZParser();
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for (final String fileName : fileNames) {
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final DigestURL location = new DigestURL("http://localhost/" + fileName);
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try (final FileInputStream inStream = new FileInputStream(new File(TEST_FOLER, fileName));) {
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final Document[] documents = parser.parse(location, "application/x-xz", StandardCharsets.UTF_8.name(),
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new VocabularyScraper(), 0, inStream);
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assertNotNull("Parser result must not be null for file " + fileName, documents);
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assertNotNull("Parsed text must not be empty for file " + fileName, documents[0].getTextString());
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assertTrue("Parsed text must contain test word with umlaut char" + fileName,
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documents[0].getTextString().contains("Maßkrügen"));
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final Collection<AnchorURL> anchors = documents[0].getAnchors();
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assertNotNull("Detected URLS must not be null for file " + fileName, anchors);
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assertEquals("One URL must have been detected for file " + fileName, 1, anchors.size());
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assertTrue(anchors.iterator().next().toString().startsWith("http://localhost/umlaute_"));
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}
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}
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}
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/**
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* Testing parse integration with the tar parser on a test txz archive.
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*
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* @throws Failure when a file could not be parsed
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* @throws InterruptedException when the test was interrupted before its
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* termination
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* @throws IOException when a read/write error occurred
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*/
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@Test
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public void testParseTxz() throws Failure, InterruptedException, IOException {
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final String fileName = "umlaute_html_xml_txt_gnu.txz";
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final XZParser parser = new XZParser();
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final DigestURL location = new DigestURL("http://localhost/" + fileName);
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try (final FileInputStream inStream = new FileInputStream(new File(TEST_FOLER, fileName));) {
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final Document[] documents = parser.parse(location, "application/x-xz", StandardCharsets.UTF_8.name(),
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new VocabularyScraper(), 0, inStream);
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assertNotNull("Parser result must not be null for file " + fileName, documents);
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final String parsedText = documents[0].getTextString();
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assertNotNull("Parsed text must not be empty for file " + fileName, parsedText);
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assertTrue("Parsed text must contain test word with umlaut char in file " + fileName,
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parsedText.contains("Maßkrügen"));
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assertTrue(parsedText.contains("Example link in ISO-8859-1 encoded HTML"));
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assertTrue(parsedText.contains("Example link in UTF-8 encoded HTML"));
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assertTrue(parsedText.contains("URL reference in raw text file"));
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assertTrue(parsedText.contains("UTF-8 encoded XML test file"));
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final Collection<AnchorURL> detectedAnchors = documents[0].getAnchors();
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assertNotNull(detectedAnchors);
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assertEquals("Parsed URLs must contains all URLs from each test file included in the archive", 5,
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detectedAnchors.size());
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assertTrue(detectedAnchors.contains(new AnchorURL("http://www.w3.org/1999/02/22-rdf-syntax-ns#")));
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assertTrue(detectedAnchors.contains(new AnchorURL("http://purl.org/dc/elements/1.1/")));
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assertTrue(detectedAnchors.contains(new AnchorURL("http://localhost/umlaute_html_iso.html")));
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assertTrue(detectedAnchors.contains(new AnchorURL("http://localhost/umlaute_html_utf8.html")));
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assertTrue(detectedAnchors.contains(new AnchorURL("http://localhost/umlaute_linux.txt")));
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}
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}
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/**
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* Unit test for the XZParser.parseWithLimits() function with some small xz test
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* files which content is within limits.
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*
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* @throws Failure when a file could not be parsed
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* @throws InterruptedException when the test was interrupted before its
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* termination
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* @throws IOException when a read/write error occurred
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*/
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@Test
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public void testParseWithLimits() throws Failure, InterruptedException, IOException {
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final String[] fileNames = { "umlaute_html_utf8.html.xz", "umlaute_linux.txt.xz" };
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final XZParser parser = new XZParser();
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for (final String fileName : fileNames) {
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final DigestURL location = new DigestURL("http://localhost/" + fileName);
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try (final FileInputStream inStream = new FileInputStream(new File(TEST_FOLER, fileName));) {
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final Document[] documents = parser.parseWithLimits(location, "application/x-xz",
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StandardCharsets.UTF_8.name(), new VocabularyScraper(), 0, inStream, 10000, 10000);
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assertNotNull("Parser result must not be null for file " + fileName, documents);
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assertNotNull("Parsed text must not be empty for file " + fileName, documents[0].getTextString());
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assertTrue("Parsed text must contain test word with umlaut char" + fileName,
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documents[0].getTextString().contains("Maßkrügen"));
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final Collection<AnchorURL> anchors = documents[0].getAnchors();
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assertNotNull("Detected URLs must not be null for file " + fileName, anchors);
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assertEquals("One URL must have been detected for file " + fileName, 1, anchors.size());
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assertTrue(anchors.iterator().next().toString().startsWith("http://localhost/umlaute_"));
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assertFalse("Parse document must not be marked as partially parsed for file " + fileName,
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documents[0].isPartiallyParsed());
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}
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}
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}
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/**
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* Unit test for the XZParser.parseWithLimits() when maxLinks limit is exceeded
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*
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* @throws Failure when a file could not be parsed
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* @throws InterruptedException when the test was interrupted before its
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* termination
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* @throws IOException when a read/write error occurred
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*/
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@Test
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public void testParseWithLimitsLinksExceeded() throws Failure, InterruptedException, IOException {
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final String[] fileNames = { "umlaute_html_utf8.html.xz", "umlaute_linux.txt.xz" };
|
||||
final XZParser parser = new XZParser();
|
||||
|
||||
/* maxLinks limit exceeded */
|
||||
for (final String fileName : fileNames) {
|
||||
final DigestURL location = new DigestURL("http://localhost/" + fileName);
|
||||
try (final FileInputStream inStream = new FileInputStream(new File(TEST_FOLER, fileName));) {
|
||||
final Document[] documents = parser.parseWithLimits(location, "application/x-xz",
|
||||
StandardCharsets.UTF_8.name(), new VocabularyScraper(), 0, inStream, 0, Long.MAX_VALUE);
|
||||
assertNotNull("Parser result must not be null for file " + fileName, documents);
|
||||
assertNotNull("Parsed text must not be empty for file " + fileName, documents[0].getTextString());
|
||||
assertTrue("Parsed text must contain test word with umlaut char" + fileName,
|
||||
documents[0].getTextString().contains("Maßkrügen"));
|
||||
final Collection<AnchorURL> anchors = documents[0].getAnchors();
|
||||
assertTrue("Detected URLs must be empty for file " + fileName, anchors == null || anchors.isEmpty());
|
||||
assertTrue("Parsed document must be marked as partially parsed for file " + fileName,
|
||||
documents[0].isPartiallyParsed());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Unit test for the XZParser.parseWithLimits() when maxBytes limit is exceeded
|
||||
*
|
||||
* @throws Failure when a file could not be parsed
|
||||
* @throws InterruptedException when the test was interrupted before its
|
||||
* termination
|
||||
* @throws IOException when a read/write error occurred
|
||||
*/
|
||||
@Test
|
||||
public void testParseWithLimitsBytesExceeded() throws Failure, InterruptedException, IOException {
|
||||
final String[] fileNames = { "umlaute_html_utf8.html.xz", "umlaute_linux.txt.xz" };
|
||||
final XZParser parser = new XZParser();
|
||||
|
||||
String fileName = fileNames[0];
|
||||
|
||||
DigestURL location = new DigestURL("http://localhost/" + fileName);
|
||||
try (final FileInputStream inStream = new FileInputStream(new File(TEST_FOLER, fileName));) {
|
||||
/*
|
||||
* The bytes limit is set to let parsing the beginning text part, but stop
|
||||
* before reaching the <a> tag
|
||||
*/
|
||||
final long maxBytes = 258;
|
||||
final Document[] documents = parser.parseWithLimits(location, "application/x-xz",
|
||||
StandardCharsets.UTF_8.name(), new VocabularyScraper(), 0, inStream, Integer.MAX_VALUE, maxBytes);
|
||||
assertNotNull("Parser result must not be null for file " + fileName, documents);
|
||||
assertNotNull("Parsed text must not be empty for file " + fileName, documents[0].getTextString());
|
||||
assertTrue("Parsed text must contain test word with umlaut char" + fileName,
|
||||
documents[0].getTextString().contains("Maßkrügen"));
|
||||
final Collection<AnchorURL> anchors = documents[0].getAnchors();
|
||||
assertTrue("Detected URLs must be empty for file " + fileName, anchors == null || anchors.isEmpty());
|
||||
assertTrue("Parsed document must be marked as partially parsed for file " + fileName,
|
||||
documents[0].isPartiallyParsed());
|
||||
}
|
||||
|
||||
fileName = fileNames[1];
|
||||
location = new DigestURL("http://localhost/" + fileName);
|
||||
try (final FileInputStream inStream = new FileInputStream(new File(TEST_FOLER, fileName));) {
|
||||
/*
|
||||
* The bytes limit is set to let parsing the beginning of the text, but stop
|
||||
* before reaching the URL
|
||||
*/
|
||||
final long maxBytes = 65;
|
||||
final Document[] documents = parser.parseWithLimits(location, "application/x-xz",
|
||||
StandardCharsets.UTF_8.name(), new VocabularyScraper(), 0, inStream, Integer.MAX_VALUE, maxBytes);
|
||||
assertNotNull("Parser result must not be null for file " + fileName, documents);
|
||||
assertNotNull("Parsed text must not be empty for file " + fileName, documents[0].getTextString());
|
||||
assertTrue("Parsed text must contain test word with umlaut char" + fileName,
|
||||
documents[0].getTextString().contains("Maßkrügen"));
|
||||
final Collection<AnchorURL> anchors = documents[0].getAnchors();
|
||||
assertTrue("Detected URLs must be empty for file " + fileName, anchors == null || anchors.isEmpty());
|
||||
assertTrue("Parsed document must be marked as partially parsed for file " + fileName,
|
||||
documents[0].isPartiallyParsed());
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
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Reference in new issue