Source Code Cross Referenced for pdfParser.java in  » Search-Engine » yacy » de » anomic » plasma » parser » pdf » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » yacy » de.anomic.plasma.parser.pdf 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        //pdfParser.java 
002:        //------------------------
003:        //part of YaCy
004:        //(C) by Michael Peter Christen; mc@anomic.de
005:        //first published on http://www.anomic.de
006:        //Frankfurt, Germany, 2005
007:        //
008:        //this file is contributed by Martin Thelian
009:        //last major change: 24.04.2005
010:        //
011:        //This program is free software; you can redistribute it and/or modify
012:        //it under the terms of the GNU General Public License as published by
013:        //the Free Software Foundation; either version 2 of the License, or
014:        //(at your option) any later version.
015:        //
016:        //This program is distributed in the hope that it will be useful,
017:        //but WITHOUT ANY WARRANTY; without even the implied warranty of
018:        //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
019:        //GNU General Public License for more details.
020:        //
021:        //You should have received a copy of the GNU General Public License
022:        //along with this program; if not, write to the Free Software
023:        //Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
024:        //
025:        //Using this software in any meaning (reading, learning, copying, compiling,
026:        //running) means that you agree that the Author(s) is (are) not responsible
027:        //for cost, loss of data or any harm that may be caused directly or indirectly
028:        //by usage of this softare or this documentation. The usage of this software
029:        //is on your own risk. The installation and usage (starting/running) of this
030:        //software may allow other people or application to access your computer and
031:        //any attached devices and is highly dependent on the configuration of the
032:        //software which must be done by the user of the software; the author(s) is
033:        //(are) also not responsible for proper configuration and usage of the
034:        //software, even if provoked by documentation provided together with
035:        //the software.
036:        //
037:        //Any changes to this file according to the GPL as documented in the file
038:        //gpl.txt aside this file in the shipment you received can be done to the
039:        //lines that follows this copyright notice here, but changes must not be
040:        //done inside the copyright notive above. A re-distribution must contain
041:        //the intact and unchanged copyright notice.
042:        //Contributions and changes to the program code must be marked as such.
043:
044:        package de.anomic.plasma.parser.pdf;
045:
046:        import java.io.File;
047:        import java.io.FileOutputStream;
048:        import java.io.InputStream;
049:        import java.io.OutputStreamWriter;
050:        import java.io.Writer;
051:        import java.util.Hashtable;
052:
053:        import org.pdfbox.pdfparser.PDFParser;
054:        import org.pdfbox.pdmodel.PDDocument;
055:        import org.pdfbox.pdmodel.PDDocumentInformation;
056:        import org.pdfbox.pdmodel.encryption.StandardDecryptionMaterial;
057:        import org.pdfbox.util.PDFTextStripper;
058:
059:        import de.anomic.plasma.plasmaCrawlEURL;
060:        import de.anomic.plasma.plasmaParserDocument;
061:        import de.anomic.plasma.parser.AbstractParser;
062:        import de.anomic.plasma.parser.Parser;
063:        import de.anomic.plasma.parser.ParserException;
064:        import de.anomic.server.serverCharBuffer;
065:        import de.anomic.yacy.yacyURL;
066:
067:        public class pdfParser extends AbstractParser implements  Parser {
068:
069:            /**
070:             * a list of mime types that are supported by this parser class
071:             * @see #getSupportedMimeTypes()
072:             */
073:            public static final Hashtable<String, String> SUPPORTED_MIME_TYPES = new Hashtable<String, String>();
074:            static {
075:                SUPPORTED_MIME_TYPES.put("application/pdf", "pdf");
076:            }
077:
078:            /**
079:             * a list of library names that are needed by this parser
080:             * @see Parser#getLibxDependences()
081:             */
082:            private static final String[] LIBX_DEPENDENCIES = new String[] {
083:                    "PDFBox-0.7.3.jar", "FontBox-0.1.0-dev.jar",
084:                    "bcprov-jdk14-132.jar" };
085:
086:            public pdfParser() {
087:                super (LIBX_DEPENDENCIES);
088:                this .parserName = "Acrobat Portable Document Parser";
089:            }
090:
091:            public Hashtable<String, String> getSupportedMimeTypes() {
092:                return SUPPORTED_MIME_TYPES;
093:            }
094:
095:            public plasmaParserDocument parse(yacyURL location,
096:                    String mimeType, String charset, InputStream source)
097:                    throws ParserException, InterruptedException {
098:
099:                PDDocument theDocument = null;
100:                Writer writer = null;
101:                File writerFile = null;
102:                try {
103:                    // reducing thread priority
104:                    Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
105:
106:                    // deactivating the logging for jMimeMagic
107:                    //            Logger theLogger = Logger.getLogger("org.pdfbox");
108:                    //            theLogger.setLevel(Level.INFO);            
109:
110:                    String docTitle = null, docSubject = null, docAuthor = null, docKeywordStr = null;
111:
112:                    // check for interruption
113:                    checkInterruption();
114:
115:                    // creating a pdf parser
116:                    PDFParser parser = new PDFParser(source);
117:                    parser.parse();
118:
119:                    // check for interruption
120:                    checkInterruption();
121:
122:                    // creating a text stripper
123:                    PDFTextStripper stripper = new PDFTextStripper();
124:                    theDocument = parser.getPDDocument();
125:
126:                    if (theDocument.isEncrypted()) {
127:                        theDocument
128:                                .openProtection(new StandardDecryptionMaterial(
129:                                        ""));
130:                        if (!theDocument.getCurrentAccessPermission()
131:                                .canExtractContent())
132:                            throw new ParserException("Document is encrypted",
133:                                    location,
134:                                    plasmaCrawlEURL.DENIED_DOCUMENT_ENCRYPTED);
135:                    }
136:
137:                    // extracting some metadata
138:                    PDDocumentInformation theDocInfo = theDocument
139:                            .getDocumentInformation();
140:                    if (theDocInfo != null) {
141:                        docTitle = theDocInfo.getTitle();
142:                        docSubject = theDocInfo.getSubject();
143:                        docAuthor = theDocInfo.getAuthor();
144:                        docKeywordStr = theDocInfo.getKeywords();
145:                    }
146:
147:                    // creating a writer for output
148:                    if ((this .contentLength == -1)
149:                            || (this .contentLength > Parser.MAX_KEEP_IN_MEMORY_SIZE)) {
150:                        writerFile = File.createTempFile("pdfParser", ".tmp");
151:                        writer = new OutputStreamWriter(new FileOutputStream(
152:                                writerFile), "UTF-8");
153:                    } else {
154:                        writer = new serverCharBuffer();
155:                    }
156:
157:                    stripper.writeText(theDocument, writer);
158:                    theDocument.close();
159:                    theDocument = null;
160:                    writer.close();
161:
162:                    String[] docKeywords = null;
163:                    if (docKeywordStr != null)
164:                        docKeywords = docKeywordStr.split(" |,");
165:
166:                    plasmaParserDocument theDoc = null;
167:
168:                    if (writer instanceof  serverCharBuffer) {
169:                        byte[] contentBytes = ((serverCharBuffer) writer)
170:                                .toString().getBytes("UTF-8");
171:                        theDoc = new plasmaParserDocument(location, mimeType,
172:                                "UTF-8", docKeywords,
173:                                (docTitle == null) ? docSubject : docTitle,
174:                                docAuthor, null, null, contentBytes, null, null);
175:                    } else {
176:                        theDoc = new plasmaParserDocument(location, mimeType,
177:                                "UTF-8", docKeywords,
178:                                (docTitle == null) ? docSubject : docTitle,
179:                                docAuthor, null, null, writerFile, null, null);
180:                    }
181:
182:                    return theDoc;
183:                } catch (Exception e) {
184:                    if (e instanceof  InterruptedException)
185:                        throw (InterruptedException) e;
186:                    if (e instanceof  ParserException)
187:                        throw (ParserException) e;
188:
189:                    // close the writer
190:                    if (writer != null)
191:                        try {
192:                            writer.close();
193:                        } catch (Exception ex) {/* ignore this */
194:                        }
195:
196:                    // delete the file
197:                    if (writerFile != null)
198:                        try {
199:                            writerFile.delete();
200:                        } catch (Exception ex) {/* ignore this */
201:                        }
202:
203:                    throw new ParserException(
204:                            "Unexpected error while parsing pdf file. "
205:                                    + e.getMessage(), location);
206:                } finally {
207:                    if (theDocument != null)
208:                        try {
209:                            theDocument.close();
210:                        } catch (Exception e) {/* ignore this */
211:                        }
212:                    if (writer != null)
213:                        try {
214:                            writer.close();
215:                        } catch (Exception e) {/* ignore this */
216:                        }
217:                    Thread.currentThread().setPriority(Thread.NORM_PRIORITY);
218:                }
219:            }
220:
221:            public void reset() {
222:                // Nothing todo here at the moment
223:                super.reset();
224:            }
225:
226:        }
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