com.moz.fiji.schema.tools.synth.NGramSynthesizer.java Source code

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Here is the source code for com.moz.fiji.schema.tools.synth.NGramSynthesizer.java

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/**
 * (c) Copyright 2012 WibiData, Inc.
 *
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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 com.moz.fiji.schema.tools.synth;

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

import org.apache.commons.lang.StringUtils;

import com.moz.fiji.annotations.ApiAudience;

/**
 * Generates n-grams.
 */
@ApiAudience.Private
public final class NGramSynthesizer implements Synthesizer<String> {
    /** The number of words in the n-gram. */
    private int mN;
    /** A word synthesizer. */
    private WordSynthesizer mWordSynthesizer;

    /**
     * Constructs a new n-gram synthesizer.
     *
     * @param wordSynthesizer A synthesizer to generate the words in the n-grams.
     * @param n The number of words in the n-gram.
     */
    public NGramSynthesizer(WordSynthesizer wordSynthesizer, int n) {
        mN = n;
        mWordSynthesizer = wordSynthesizer;
    }

    @Override
    public String synthesize() {
        // Pick n words from the dictionary.
        List<String> grams = new ArrayList<String>(mN);
        for (int i = 0; i < mN; i++) {
            grams.add(mWordSynthesizer.synthesize());
        }
        return StringUtils.join(grams, " ");
    }
}