// SurrogateReader.java
// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 15.04.2009 on http://yacy.net
//
// $LastChangedDate: 2011-05-17 10:57:49 +0200 (Di, 17. Mai 2011) $
// $LastChangedRevision: 7727 $
// $LastChangedBy: orbiter $
//
// LICENSE
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.yacy.document.content;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.zip.GZIPInputStream;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import net.yacy.kelondro.logging.Log;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
public class SurrogateReader extends DefaultHandler implements Runnable {
// definition of the surrogate main element
public final static String SURROGATES_MAIN_ELEMENT_NAME =
"surrogates";
public final static String SURROGATES_MAIN_ELEMENT_OPEN =
"<" + SURROGATES_MAIN_ELEMENT_NAME +
" xmlns:dc=\"http://purl.org/dc/elements/1.1/\"" +
" xmlns:yacy=\"http://yacy.net/\"" +
" xmlns:geo=\"http://www.w3.org/2003/01/geo/wgs84_pos#\">";
public final static String SURROGATES_MAIN_ELEMENT_CLOSE =
"</" + SURROGATES_MAIN_ELEMENT_NAME + ">";
// class variables
private final StringBuilder buffer;
private boolean parsingValue;
private DCEntry surrogate;
private String elementName;
private final BlockingQueue<DCEntry> surrogates;
private SAXParser saxParser;
private final InputSource inputSource;
private final InputStream inputStream;
public SurrogateReader(final InputStream stream, int queueSize) throws IOException {
this.buffer = new StringBuilder(300);
this.parsingValue = false;
this.surrogate = null;
this.elementName = null;
this.surrogates = new ArrayBlockingQueue<DCEntry>(queueSize);
Reader reader = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
this.inputSource = new InputSource(reader);
this.inputSource.setEncoding("UTF-8");
this.inputStream = stream;
final SAXParserFactory factory = SAXParserFactory.newInstance();
try {
this.saxParser = factory.newSAXParser();
} catch (ParserConfigurationException e) {
Log.logException(e);
throw new IOException(e.getMessage());
} catch (SAXException e) {
Log.logException(e);
throw new IOException(e.getMessage());
}
}
public void run() {
try {
this.saxParser.parse(this.inputSource, this);
} catch (SAXParseException e) {
Log.logException(e);
} catch (SAXException e) {
Log.logException(e);
} catch (IOException e) {
Log.logException(e);
} finally {
try {
this.surrogates.put(DCEntry.poison);
} catch (InterruptedException e1) {
Log.logException(e1);
}
try {
this.inputStream.close();
} catch (IOException e) {
Log.logException(e);
}
}
}
public void startElement(final String uri, final String name, String tag, final Attributes atts) throws SAXException {
if (tag == null) return;
tag = tag.toLowerCase();
if ("record".equals(tag) || "document".equals(tag)) {
this.surrogate = new DCEntry();
} else if ("element".equals(tag)) {
this.elementName = atts.getValue("name");
} else if ("value".equals(tag)) {
this.buffer.setLength(0);
this.parsingValue = true;
} else if (tag.startsWith("dc:") || tag.startsWith("geo:")) {
// parse dublin core attribute
this.elementName = tag;
this.parsingValue = true;
}
}
public void endElement(final String uri, final String name, String tag) {
if (tag == null) return;
tag = tag.toLowerCase();
if ("record".equals(tag) || "document".equals(tag)) {
//System.out.println("A Title: " + this.surrogate.title());
try {
this.surrogates.put(this.surrogate);
} catch (InterruptedException e) {
Log.logException(e);
} finally {
//System.out.println("B Title: " + this.surrogate.title());
this.surrogate = null;
this.buffer.setLength(0);
this.parsingValue = false;
}
} else if ("element".equals(tag)) {
this.buffer.setLength(0);
this.parsingValue = false;
} else if ("value".equals(tag)) {
//System.out.println("BUFFER-SIZE=" + buffer.length());
final String value = buffer.toString().trim();
if (this.elementName != null) {
this.surrogate.put(this.elementName, value);
}
this.buffer.setLength(0);
this.parsingValue = false;
} else if (tag.startsWith("dc:") || tag.startsWith("geo:")) {
final String value = buffer.toString().trim();
if (this.elementName != null && tag.equals(this.elementName)) {
value.replaceAll(";", ",");
String oldcontent = this.surrogate.get(this.elementName);
if (oldcontent == null) {
this.surrogate.put(this.elementName, value);
} else {
this.surrogate.put(this.elementName, oldcontent + ";" + value);
}
}
this.buffer.setLength(0);
this.parsingValue = false;
}
}
public void characters(final char ch[], final int start, final int length) {
if (parsingValue) {
buffer.append(ch, start, length);
}
}
public DCEntry take() {
try {
return this.surrogates.take();
} catch (InterruptedException e) {
Log.logException(e);
return null;
}
}
public static void main(String[] args) {
File f = new File(args[0]);
SurrogateReader sr;
try {
InputStream is = new BufferedInputStream(new FileInputStream(f));
if (f.getName().endsWith(".gz")) is = new GZIPInputStream(is);
sr = new SurrogateReader(is, 1);
Thread t = new Thread(sr, "Surrogate-Reader " + f.getAbsolutePath());
t.start();
DCEntry s;
while ((s = sr.take()) != DCEntry.poison) {
System.out.println("Title: " + s.getTitle());
System.out.println("Date: " + s.getDate());
System.out.println("Creator: " + s.getCreator());
System.out.println("Publisher: " + s.getPublisher());
System.out.println("URL: " + s.getIdentifier(true));
System.out.println("Language: " + s.getLanguage());
System.out.println("Body: " + s.getDescription());
}
} catch (IOException e) {
Log.logException(e);
}
}
}