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Java example source code file (LabelAwareListSentenceIterator.java)

This example Java source code file (LabelAwareListSentenceIterator.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

ioexception, labelawarelistsentenceiterator, labelawaresentenceiterator, list, override, sentencepreprocessor, string, stringgrid, util

The LabelAwareListSentenceIterator.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.sentenceiterator.labelaware;

import org.deeplearning4j.util.StringGrid;
import org.deeplearning4j.text.sentenceiterator.SentencePreProcessor;

import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;

/**
 * Iterates over an input stream with the textual format:
 * label delimiter text
 *
 * @author Adam Gibson
 */
public class LabelAwareListSentenceIterator implements LabelAwareSentenceIterator {

    private int currPosition;
    private List<String> labels;
    private List<String> text;
    private String currentLabel;
    private SentencePreProcessor sentencePreProcessor;

    /**
     * Initializes the sentence iterator with the given args, note that this will close the input stream for you
     * @param is the input stream (this will be closed)
     * @param delimiter the delimiter (tab comma,...)
     * @param labelPosition the position of the label on each line
     * @param textPosition the position of the text on each line
     * @throws IOException
     */
    public LabelAwareListSentenceIterator(InputStream is,String delimiter,int labelPosition,int textPosition) throws IOException {
        StringGrid grid = StringGrid.fromInput(is,delimiter);
        labels = grid.getColumn(labelPosition);
        text = grid.getColumn(textPosition);


        is.close();

    }

    /**
     * Same as calling (is,\t,0,1)
     * @param is the input stream to read lines from
     * @throws IOException
     */
    public LabelAwareListSentenceIterator(InputStream is) throws IOException {
        this(is,"\t",0,1);
    }

    /**
     * Same as calling (is,\t,0,1)
     * @param is the input stream to read lines from
     * @param sep the separator for the file
     * @throws IOException
     */
    public LabelAwareListSentenceIterator(InputStream is,String sep) throws IOException {
        this(is,sep,0,1);
    }




    /**
     * Returns the current label for nextSentence()
     *
     * @return the label for nextSentence()
     */
    @Override
    public synchronized String currentLabel() {
        return currentLabel;
    }

    @Override
    public List<String> currentLabels() {
        return Arrays.asList(currentLabel);
    }

    /**
     * Gets the next sentence or null
     * if there's nothing left (Do yourself a favor and
     * check hasNext() )
     *
     * @return the next sentence in the iterator
     */
    @Override
    public  String nextSentence() {
        String ret = text.get(currPosition);
        currentLabel = labels.get(currPosition);
        if(sentencePreProcessor != null)
            ret = sentencePreProcessor.preProcess(ret);
        currPosition++;
        return ret;
    }

    /**
     * Same idea as {@link java.util.Iterator}
     *
     * @return whether there's anymore sentences left
     */
    @Override
    public synchronized  boolean hasNext() {
        return currPosition < text.size();
    }

    /**
     * Resets the iterator to the beginning
     */
    @Override
    public void reset() {
        currPosition = 0;

    }

    /**
     * Allows for any finishing (closing of input streams or the like)
     */
    @Override
    public void finish() {
         //no op
    }

    @Override
    public SentencePreProcessor getPreProcessor() {
        return sentencePreProcessor;
    }

    @Override
    public void setPreProcessor(SentencePreProcessor preProcessor) {
        this.sentencePreProcessor = preProcessor;
    }
}

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