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274 lines
11 KiB
274 lines
11 KiB
//AbstractParser.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@yacy.net
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2005
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//
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//this file was contributed by Martin Thelian
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//last major change: $LastChangedDate$ by $LastChangedBy$
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//Revision: $LastChangedRevision$
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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 de.anomic.plasma.parser;
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import java.io.BufferedInputStream;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.InputStream;
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import de.anomic.kelondro.util.Log;
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import de.anomic.plasma.plasmaParser;
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import de.anomic.plasma.plasmaParserDocument;
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import de.anomic.server.serverThread;
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import de.anomic.yacy.yacyURL;
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/**
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* New classes implementing the {@link de.anomic.plasma.parser.Parser} interface
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* can extend this class to inherit all functions already implemented in this class.
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* @author Martin Thelian
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* @version $LastChangedRevision$ / $LastChangedDate$
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*/
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public abstract class AbstractParser implements Parser{
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/**
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* a list of library names that are needed by this parser
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*/
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protected String[] libxDependencies = null;
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/**
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* the logger class that should be used by the parser module for logging
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* purposes.
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*/
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protected Log theLogger = null;
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/**
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* Version number of the parser
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*/
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protected String parserVersionNr = "0.1";
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/**
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* Parser name
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*/
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protected String parserName = this.getClass().getName();
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/**
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* The source file file size in bytes if the source document was passed
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* in as file
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*/
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protected long contentLength = -1;
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/**
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* The Constructor of this class.
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*/
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public AbstractParser(final String[] libxDependencies) {
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super();
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this.libxDependencies = libxDependencies;
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}
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/**
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* Set the content length of the source file.
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* This value is needed by some parsers to decide
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* if the parsed text could be hold in memory
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*/
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public void setContentLength(final long length) {
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this.contentLength = length;
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}
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/**
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* Check if the parser was interrupted.
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* @throws InterruptedException if the parser was interrupted
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*/
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public static final void checkInterruption() throws InterruptedException {
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final Thread currentThread = Thread.currentThread();
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if ((currentThread instanceof serverThread) && ((serverThread)currentThread).shutdownInProgress()) throw new InterruptedException("Shutdown in progress ...");
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if (currentThread.isInterrupted()) throw new InterruptedException("Shutdown in progress ...");
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}
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public final File createTempFile(final String name) throws IOException {
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String parserClassName = this.getClass().getName();
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int idx = parserClassName.lastIndexOf(".");
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if (idx != -1) {
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parserClassName = parserClassName.substring(idx+1);
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}
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// getting the file extension
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idx = name.lastIndexOf("/");
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final String fileName = (idx != -1) ? name.substring(idx+1) : name;
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idx = fileName.lastIndexOf(".");
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final String fileExt = (idx > -1) ? fileName.substring(idx+1) : "";
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// creates the temp file
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final File tempFile = File.createTempFile(parserClassName + "_" + ((idx>-1)?fileName.substring(0,idx):fileName), (fileExt.length()>0)?"."+fileExt:fileExt);
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return tempFile;
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}
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public int parseDir(final yacyURL location, final String prefix, final File dir, final plasmaParserDocument doc)
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throws ParserException, InterruptedException, IOException {
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if (!dir.isDirectory())
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throw new ParserException("tried to parse ordinary file " + dir + " as directory", location);
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final String[] files = dir.list();
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int result = 0;
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for (int i=0; i<files.length; i++) {
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checkInterruption();
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final File file = new File(dir, files[i]);
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this.theLogger.logFine("parsing file " + location + "#" + file + " in archive...");
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if (file.isDirectory()) {
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result += parseDir(location, prefix, file, doc);
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} else try {
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final yacyURL url = yacyURL.newURL(location, "/" + prefix + "/"
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// XXX: workaround for relative paths within document
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+ file.getPath().substring(file.getPath().indexOf(File.separatorChar) + 1)
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+ "/" + file.getName());
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final plasmaParserDocument subdoc = new plasmaParser().parseSource(
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url,
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plasmaParser.getMimeTypeByFileExt(files[i].substring(files[i].indexOf('.') + 1)),
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null, file);
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// TODO: change anchors back to use '#' after archive name
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doc.addSubDocument(subdoc);
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subdoc.close();
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result++;
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} catch (final ParserException e) {
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this.theLogger.logInfo("unable to parse file " + file + " in " + location + ", skipping");
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}
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}
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return result;
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}
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/**
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* Parsing a document available as byte array.
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* @param location the origin of the document
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* @param mimeType the mimetype of the document
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* @param charset the supposed charset of the document or <code>null</code> if unkown
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* @param source the content byte array
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* @return a {@link plasmaParserDocument} containing the extracted plain text of the document
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* and some additional metadata.
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* @throws ParserException if the content could not be parsed properly
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*
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* @see de.anomic.plasma.parser.Parser#parse(de.anomic.net.URL, java.lang.String, byte[])
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*/
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public plasmaParserDocument parse(
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final yacyURL location,
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final String mimeType,
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final String charset,
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final byte[] source
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) throws ParserException, InterruptedException {
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ByteArrayInputStream contentInputStream = null;
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try {
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// convert the byte array into a stream
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contentInputStream = new ByteArrayInputStream(source);
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// parse the stream
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return this.parse(location,mimeType,charset,contentInputStream);
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} finally {
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if (contentInputStream != null) {
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try {
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contentInputStream.close();
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contentInputStream = null;
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} catch (final Exception e){ /* ignore this */}
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}
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}
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}
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/**
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* Parsing a document stored in a {@link File}
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* @param location the origin of the document
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* @param mimeType the mimetype of the document
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* @param charset the supposed charset of the document or <code>null</code> if unkown
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* @param sourceFile the file containing the content of the document
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* @return a {@link plasmaParserDocument} containing the extracted plain text of the document
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* and some additional metadata.
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* @throws ParserException if the content could not be parsed properly
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*
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* @see de.anomic.plasma.parser.Parser#parse(de.anomic.net.URL, java.lang.String, java.io.File)
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*/
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public plasmaParserDocument parse(
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final yacyURL location,
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final String mimeType,
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final String charset,
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final File sourceFile
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) throws ParserException, InterruptedException {
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BufferedInputStream contentInputStream = null;
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try {
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// getting the file size of the document
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this.contentLength = sourceFile.length();
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// create a stream from the file
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contentInputStream = new BufferedInputStream(new FileInputStream(sourceFile));
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// parse the stream
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return this.parse(location, mimeType, charset, contentInputStream);
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} catch (final FileNotFoundException e) {
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throw new ParserException("Unexpected error while parsing file. " + e.getMessage(),location);
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} finally {
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if (contentInputStream != null) try{contentInputStream.close();}catch(final Exception e){/* ignore this */}
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}
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}
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/**
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* Parsing a document available as {@link InputStream}
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* @param location the origin of the document
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* @param mimeType the mimetype of the document
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* @param charset the supposed charset of the document or <code>null</code> if unkown
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* @param source the {@link InputStream} containing the document content
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* @return a {@link plasmaParserDocument} containing the extracted plain text of the document
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* and some additional metadata.
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* @throws ParserException if the content could not be parsed properly
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*
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* @see de.anomic.plasma.parser.Parser#parse(de.anomic.net.URL, java.lang.String, java.io.InputStream)
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*/
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public abstract plasmaParserDocument parse(yacyURL location, String mimeType, String charset, InputStream source) throws ParserException, InterruptedException;
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/**
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* @return Returns a list of library names that are needed by this parser
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* @see de.anomic.plasma.parser.Parser#getLibxDependences()
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*/
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public String[] getLibxDependences() {
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return this.libxDependencies;
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}
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/**
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* Setting the logger that should be used by this parser class ...
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*/
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public void setLogger(final Log log) {
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this.theLogger = log;
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}
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/**
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* Returns the version number of the parser
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* @return parser version number
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*/
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public String getVersion() {
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return this.parserVersionNr;
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}
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/**
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* Return the name of the parser
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*/
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public String getName() {
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return this.parserName;
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}
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public void reset() {
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this.contentLength = -1;
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}
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}
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