mirror of
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daf0f74361
search profiling showed, that a major amount of time is wasted by computing url hashes. The computation does an intranet-check, which needs a DNS lookup. This caused that each urlhash computation needed 100-200 milliseconds, which caused remote searches to delay at least 1 second more that necessary. The solution to this problem is to attach a URL hash to the URL data structure, because that means that the url hash value can be filled after retrieval of the URL from the database. The redesign of the url/urlhash management caused a major redesign of many parts of the software. Since some parts had been decided to be given up they had been removed during this change to avoid unnecessary maintenance of unused code. git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4074 6c8d7289-2bf4-0310-a012-ef5d649a1542
308 lines
12 KiB
Java
308 lines
12 KiB
Java
//psParser.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@anomic.de
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2007
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//
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//this file is contributed by Martin Thelian
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//last major change: 15.09.2005
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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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//
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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notive above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma.parser.ps;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.util.Hashtable;
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import de.anomic.plasma.plasmaParserDocument;
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import de.anomic.plasma.parser.AbstractParser;
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import de.anomic.plasma.parser.Parser;
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import de.anomic.plasma.parser.ParserException;
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import de.anomic.server.serverFileUtils;
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import de.anomic.yacy.yacyURL;
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public class psParser extends AbstractParser implements Parser {
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/**
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* a list of mime types that are supported by this parser class
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* @see #getSupportedMimeTypes()
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*/
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public static final Hashtable SUPPORTED_MIME_TYPES = new Hashtable();
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static {
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SUPPORTED_MIME_TYPES.put("application/postscript","ps");
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SUPPORTED_MIME_TYPES.put("text/postscript","ps");
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}
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/**
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* a list of library names that are needed by this parser
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* @see Parser#getLibxDependences()
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*/
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private static final String[] LIBX_DEPENDENCIES = new String[] {};
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private static Object modeScan = new Object();
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private static boolean modeScanDone = false;
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private static String parserMode = "java";
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public psParser() {
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super(LIBX_DEPENDENCIES);
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this.parserName = "PostScript Document Parser";
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if (!modeScanDone) synchronized (modeScan) {
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if (testForPs2Ascii()) parserMode = "ps2ascii";
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else parserMode = "java";
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modeScanDone = true;
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}
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}
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public Hashtable getSupportedMimeTypes() {
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return SUPPORTED_MIME_TYPES;
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}
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public boolean testForPs2Ascii() {
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try {
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String procOutputLine = null;
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StringBuffer procOutput = new StringBuffer();
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Process ps2asciiProc = Runtime.getRuntime().exec(new String[]{"ps2ascii", "--version"});
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BufferedReader stdOut = new BufferedReader(new InputStreamReader(ps2asciiProc.getInputStream()));
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while ((procOutputLine = stdOut.readLine()) != null) {
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procOutput.append(procOutputLine).append(", ");
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}
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int returnCode = ps2asciiProc.waitFor();
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return (returnCode == 0);
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} catch (Exception e) {
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if (this.theLogger != null) this.theLogger.logInfo("ps2ascii not found. Switching to java parser mode.");
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return false;
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}
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}
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public plasmaParserDocument parse(yacyURL location, String mimeType, String charset, File sourceFile) throws ParserException, InterruptedException {
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File outputFile = null;
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try {
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// creating a temp file for the output
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outputFile = super.createTempFile("ascii.txt");
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// decide with parser mode to use
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if (parserMode.equals("ps2ascii")) {
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parseUsingPS2ascii(sourceFile,outputFile);
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} else {
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parseUsingJava(sourceFile,outputFile);
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}
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// return result
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plasmaParserDocument theDoc = new plasmaParserDocument(
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location,
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mimeType,
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"UTF-8",
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null,
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null,
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"",
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null,
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null,
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outputFile,
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null,
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null);
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return theDoc;
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} catch (Exception e) {
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if (e instanceof InterruptedException) throw (InterruptedException) e;
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if (e instanceof ParserException) throw (ParserException) e;
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// delete temp file
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if (outputFile != null) outputFile.delete();
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// throw exception
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throw new ParserException("Unexpected error while parsing ps file. " + e.getMessage(),location);
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}
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}
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public void parseUsingJava (File inputFile, File outputFile) throws Exception {
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BufferedReader reader = null;
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BufferedWriter writer = null;
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try {
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reader = new BufferedReader(new FileReader(inputFile));
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writer = new BufferedWriter(new FileWriter(outputFile));
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String versionInfoLine = reader.readLine();
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String version = versionInfoLine.substring(versionInfoLine.length()-3);
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int ichar = 0;
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boolean isComment = false;
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boolean isText = false;
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if (version.startsWith("2")) {
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boolean isConnector = false;
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while ((ichar = reader.read()) > 0) {
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if (isConnector) {
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if (ichar < 108) {
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writer.write(' ');
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}
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isConnector = false;
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} else if (ichar == '%') {
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isComment = true;
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} else if (ichar == '\n' && isComment) {
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isComment = false;
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} else if (ichar == ')' && isText ) {
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isConnector = true;
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isText = false;
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} else if (isText) {
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writer.write((char)ichar);
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} else if (ichar == '(' && !isComment) {
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isText = true;
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}
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}
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} else if (version.startsWith("3")) {
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StringBuffer stmt = new StringBuffer();
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boolean isBMP = false;
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boolean isStore = false;
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int store = 0;
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while ((ichar = reader.read()) > 0) {
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if (ichar == '%') {
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isComment = true;
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} else if (ichar == '\n' && isComment){
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isComment = false;
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} else if (ichar == ')' && isText ) {
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isText = false;
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} else if (isText && !isBMP) {
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writer.write((char)ichar);
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} else if (ichar == '(' && !isComment && !isBMP) {
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isText = true;
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} else if (isStore) {
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if (store == 9 || ichar == ' ' || ichar == 10) {
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isStore = false;
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store = 0;
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if (stmt.toString().equals("BEGINBITM")) {
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isText = false;
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isBMP = true;
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} else if (stmt.toString().equals("ENDBITMAP")) {
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isBMP = false;
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}
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stmt.delete(0,stmt.length());
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}
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else {
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stmt.append((char)ichar);
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store++;
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}
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} else if (!isComment && !isStore && (ichar == 66 || ichar == 69)) {
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isStore = true;
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stmt.append((char)ichar);
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store++;
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}
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}
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} else {
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throw new Exception("Unsupported Postscript version '" + version + "'.");
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}
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} finally {
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if (reader != null) try { reader.close(); } catch (Exception e) {/* */}
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if (writer != null) try { writer.close(); } catch (Exception e) {/* */}
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}
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}
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/**
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* This function requires the ghostscript-library
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* @param inputFile
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* @param outputFile
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* @throws Exception
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*/
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private void parseUsingPS2ascii(File inputFile, File outputFile) throws Exception {
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int execCode = 0;
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StringBuffer procErr = null;
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try {
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String procOutputLine = null;
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StringBuffer procOut = new StringBuffer();
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procErr = new StringBuffer();
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Process ps2asciiProc = Runtime.getRuntime().exec(new String[]{"ps2ascii", inputFile.getAbsolutePath(),outputFile.getAbsolutePath()});
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BufferedReader stdOut = new BufferedReader(new InputStreamReader(ps2asciiProc.getInputStream()));
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BufferedReader stdErr = new BufferedReader(new InputStreamReader(ps2asciiProc.getErrorStream()));
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while ((procOutputLine = stdOut.readLine()) != null) {
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procOut.append(procOutputLine);
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}
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while ((procOutputLine = stdErr.readLine()) != null) {
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procErr.append(procOutputLine);
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}
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execCode = ps2asciiProc.waitFor();
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} catch (Exception e) {
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String errorMsg = "Unable to convert ps to ascii. " + e.getMessage();
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this.theLogger.logSevere(errorMsg);
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throw new Exception(errorMsg);
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}
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if (execCode != 0) throw new Exception("Unable to convert ps to ascii. ps2ascii returned statuscode " + execCode + "\n" + procErr.toString());
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}
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public void reset() {
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// Nothing todo here at the moment
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super.reset();
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}
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public plasmaParserDocument parse(yacyURL location, String mimeType, String charset, InputStream source) throws ParserException, InterruptedException {
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File tempFile = null;
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try {
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// creating a tempfile
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tempFile = super.createTempFile("temp.ps");
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tempFile.deleteOnExit();
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// copying inputstream into file
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serverFileUtils.copy(source,tempFile);
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// parsing the file
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return parse(location,mimeType,charset,tempFile);
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} catch (Exception e) {
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if (e instanceof InterruptedException) throw (InterruptedException) e;
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if (e instanceof ParserException) throw (ParserException) e;
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throw new ParserException("Unable to parse the ps file. " + e.getMessage(),location, e);
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} finally {
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if (tempFile != null) try{ tempFile.delete(); }catch(Exception e) {/* */}
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}
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}
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}
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