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Java example source code file (PosUimaTokenizer.java)

This example Java source code file (PosUimaTokenizer.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

a-z, analysisengine, arraylist, cas, collection, english, list, none, override, posuimatokenizer, runtimeexception, string, tokenpreprocess, util

The PosUimaTokenizer.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    Licensed under the Apache License, Version 2.0 (the "License");
 *  *    you may not use this file except in compliance with the License.
 *  *    You may obtain a copy of the License at
 *  *
 *  *        http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  *    Unless required by applicable law or agreed to in writing, software
 *  *    distributed under the License is distributed on an "AS IS" BASIS,
 *  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  *    See the License for the specific language governing permissions and
 *  *    limitations under the License.
 *
 */

package org.deeplearning4j.text.tokenization.tokenizer;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import lombok.NonNull;
import org.apache.uima.analysis_engine.AnalysisEngine;
import org.apache.uima.cas.CAS;
import org.apache.uima.fit.factory.AnalysisEngineFactory;
import org.apache.uima.fit.util.JCasUtil;
import org.cleartk.token.type.Sentence;
import org.cleartk.token.type.Token;
import org.deeplearning4j.text.annotator.PoStagger;
import org.deeplearning4j.text.annotator.SentenceAnnotator;
import org.deeplearning4j.text.annotator.StemmerAnnotator;
import org.deeplearning4j.text.annotator.TokenizerAnnotator;

/**
 * Filter by part of speech tag.
 * Any not valid part of speech tags
 * become NONE
 * @author Adam Gibson
 *
 */
public class PosUimaTokenizer  implements Tokenizer {

    private static AnalysisEngine engine;
    private List<String> tokens;
    private Collection<String> allowedPosTags;
    private int index;
    private static CAS cas;
    private TokenPreProcess preProcessor;
    private boolean stripNones = false;

    public PosUimaTokenizer(String tokens,AnalysisEngine engine,Collection<String> allowedPosTags) {
        this(tokens, engine, allowedPosTags, false);
    }

    public PosUimaTokenizer(String tokens,AnalysisEngine engine,Collection<String> allowedPosTags, boolean stripNones) {
        if(PosUimaTokenizer.engine == null)
            PosUimaTokenizer.engine = engine;
        this.allowedPosTags = allowedPosTags;
        this.tokens = new ArrayList<String>();
        this.stripNones = stripNones;
        try {
            if(cas == null)
                cas = engine.newCAS();

            cas.reset();
            cas.setDocumentText(tokens);
            PosUimaTokenizer.engine.process(cas);
            for(Sentence s : JCasUtil.select(cas.getJCas(), Sentence.class)) {
                for(Token t : JCasUtil.selectCovered(Token.class,s)) {
                    //add NONE for each invalid token
                    if(valid(t))
                        if(t.getLemma() != null)
                            this.tokens.add(t.getLemma());
                        else if(t.getStem() != null)
                            this.tokens.add(t.getStem());
                        else
                            this.tokens.add(t.getCoveredText());
                    else
                        this.tokens.add("NONE");
                }
            }




        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    private boolean valid(Token token) {
        String check = token.getCoveredText();
        if(check.matches("<[A-Z]+>") || check.matches(""))
            return false;
        else if(token.getPos() != null && !this.allowedPosTags.contains(token.getPos()))
            return false;
        return true;
    }



    @Override
    public boolean hasMoreTokens() {
        return index < tokens.size();
    }

    @Override
    public int countTokens() {
        return tokens.size();
    }

    @Override
    public String nextToken() {
        String ret = tokens.get(index); // preProcessor != null ? preProcessor.preProcess(tokens.get(index)) : tokens.get(index);
        index++;
        return ret;
    }

    @Override
    public List<String> getTokens() {
        List<String> tokens = new ArrayList();
        while(hasMoreTokens()) {
            String nextT = nextToken();
            if (stripNones && nextT.equals("NONE"))
                continue;
            tokens.add(preProcessor != null ? preProcessor.preProcess(nextT) : nextT);
        }
        return tokens;
    }

    public static AnalysisEngine defaultAnalysisEngine()  {
        try {
            return AnalysisEngineFactory.createEngine(AnalysisEngineFactory.createEngineDescription(SentenceAnnotator.getDescription(), TokenizerAnnotator.getDescription(), PoStagger.getDescription("en"), StemmerAnnotator.getDescription("English")));
        }catch(Exception e) {
            throw new RuntimeException(e);
        }
    }

	@Override
	public void setTokenPreProcessor(@NonNull TokenPreProcess tokenPreProcessor) {
		this.preProcessor = tokenPreProcessor;
	}




}

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