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Java example source code file (NGramTokenizerFactory.java)

This example Java source code file (NGramTokenizerFactory.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.

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Java - Java tags/keywords

illegalargumentexception, integer, ngramtokenizerfactory, override, tokenizer, tokenizerfactory, tokenpreprocess, unable, unsupportedoperationexception

The NGramTokenizerFactory.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.tokenizerfactory;

import org.deeplearning4j.text.tokenization.tokenizer.NGramTokenizer;
import org.deeplearning4j.text.tokenization.tokenizer.TokenPreProcess;
import org.deeplearning4j.text.tokenization.tokenizer.Tokenizer;

import java.io.InputStream;

 * @author sonali
public class NGramTokenizerFactory implements TokenizerFactory {
    private TokenPreProcess preProcess;
    private Integer minN = 1;
    private Integer maxN = 1;
    private TokenizerFactory tokenizerFactory;

    public NGramTokenizerFactory(TokenizerFactory tokenizerFactory,Integer minN, Integer maxN) {
        this.tokenizerFactory = tokenizerFactory;
        this.minN = minN;
        this.maxN = maxN;

    public Tokenizer create(String toTokenize) {
        if (toTokenize == null || toTokenize.isEmpty()) {
            throw new IllegalArgumentException("Unable to proceed; no sentence to tokenize");

        Tokenizer t1 = tokenizerFactory.create(toTokenize);
        Tokenizer ret = new NGramTokenizer(t1, minN, maxN);
        return ret;

    public Tokenizer create(InputStream toTokenize) {
        throw new UnsupportedOperationException();

    public void setTokenPreProcessor(TokenPreProcess preProcessor) {
        this.preProcess = preProcessor;

     * Returns TokenPreProcessor set for this TokenizerFactory instance
     * @return TokenPreProcessor instance, or null if no preprocessor was defined
    public TokenPreProcess getTokenPreProcessor() {
        return preProcess;

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