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/*
 * Copyright (c) 2010-2025 Haifeng Li. All rights reserved.
 *
 * Smile 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 3 of the License, or
 * (at your option) any later version.
 *
 * Smile 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 Smile. If not, see .
 */
package smile.nlp;

/**
 * The terms in a text.
 *
 * @author Haifeng Li
 */
public interface TextTerms {
    
    /**
     * Returns the number of words.
     * @return the number of words.
     */
    int size();

    /**
     * Returns the iterator of the words of the document.
     * The stop words and punctuations may be removed.
     * @return the iterator of the words of the document.
     */
    Iterable words();

    /**
     * Returns the iterator of unique words.
     * @return the iterator of unique words.
     */
    Iterable unique();

    /**
     * Returns the term frequency.
     * @param term the term.
     * @return the term frequency.
     */
    int tf(String term);

    /**
     * Returns the maximum term frequency over all terms in the document.
     * @return the maximum term frequency.
     */
    int maxtf();

}