mirror of
https://github.com/yacy/yacy_search_server.git
synced 2024-09-19 00:01:41 +02:00
d27adc2b92
NullPointerException occurred when using and Identificator instance which encountered and error in its constructor. This error could be caused by a missing "langdetect" folder in the current folder of the main process, or by simultaneous first calls to the constructor, initializing concurrently the DetectorFactory.langlist. Fixes the mantis 714 (http://mantis.tokeek.de/view.php?id=714)
109 lines
3.4 KiB
Java
109 lines
3.4 KiB
Java
// Identificator.java
|
|
// -----------------------
|
|
// (C) by Marc Nause; marc.nause@audioattack.de
|
|
// first published on http://www.yacy.net
|
|
// Braunschweig, Germany, 2008
|
|
//
|
|
// $LastChangedDate$
|
|
// $LastChangedRevision$
|
|
// $LastChangedBy$
|
|
//
|
|
// 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.language;
|
|
|
|
import java.util.ArrayList;
|
|
|
|
import com.cybozu.labs.langdetect.Detector;
|
|
import com.cybozu.labs.langdetect.DetectorFactory;
|
|
import com.cybozu.labs.langdetect.LangDetectException;
|
|
import com.cybozu.labs.langdetect.Language;
|
|
|
|
import net.yacy.cora.util.ConcurrentLog;
|
|
|
|
/**
|
|
* This class can try to identify the language a text is written in.
|
|
*/
|
|
public final class Identificator {
|
|
|
|
private Detector detector;
|
|
private Language language;
|
|
|
|
/**
|
|
* Default constructor. Requires the DetectorFactory language profiles to be loaded before.
|
|
*/
|
|
public Identificator() {
|
|
try {
|
|
this.detector = DetectorFactory.create();
|
|
} catch (LangDetectException e) {
|
|
ConcurrentLog.logException(e);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Append a word to the text to be analyzed.
|
|
* Analysis takes letter case into account (this means word should not be upper- or lower cased)
|
|
* @param word
|
|
*/
|
|
public void add(final String word) {
|
|
if (word == null || this.detector == null) {
|
|
return;
|
|
}
|
|
this.detector.append(" " + word); // detector internally caches text up to maxtextlen = default = 10000 chars
|
|
}
|
|
|
|
/**
|
|
* Get the detected language with highest probability
|
|
* if detection probability is above 0.3 (30%)
|
|
* Underlying detector differentiates zh-cn and zh-tw, these are returned as zh here.
|
|
* @return 2 char language code (ISO 639-1)
|
|
*/
|
|
public String getLanguage() {
|
|
if(this.detector != null) {
|
|
try {
|
|
ArrayList<Language> probabilities = this.detector.getProbabilities();
|
|
if(probabilities.isEmpty()) return null;
|
|
this.language = this.detector.getProbabilities().get(0);
|
|
} catch (LangDetectException e) {
|
|
// this contains mostly the message "no features in text"
|
|
//ConcurrentLog.logException(e);
|
|
return null;
|
|
}
|
|
// Return language only if probability is higher than 30% to account for missing language profiles
|
|
if (this.language.prob > 0.3) {
|
|
if (this.language.lang.length() == 2) {
|
|
return this.language.lang;
|
|
}
|
|
return this.language.lang.substring(0,2);
|
|
}
|
|
}
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
/**
|
|
* Get the probability of the detected language (returned by {@link #getLanguage()})
|
|
* @return 0.0 to 1.0
|
|
*/
|
|
public double getProbability() {
|
|
if (language != null) {
|
|
return language.prob;
|
|
}
|
|
return 0.0;
|
|
}
|
|
|
|
}
|