Java tutorial
/* * This program 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ /* * Tokenizer.java * Copyright (C) 2007-2012 University of Waikato, Hamilton, New Zealand */ package weka.core.tokenizers; import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.Serializable; import java.util.Enumeration; import java.util.Vector; import weka.core.Option; import weka.core.OptionHandler; import weka.core.RevisionHandler; /** * A superclass for all tokenizer algorithms. * * @author FracPete (fracpete at waikato dot ac dot nz) * @version $Revision$ */ public abstract class Tokenizer implements Enumeration<String>, OptionHandler, Serializable, RevisionHandler { /** Added to avoid warning */ private static final long serialVersionUID = 7781271062738973996L; /** * Returns a string describing the stemmer * * @return a description suitable for displaying in the explorer/experimenter * gui */ public abstract String globalInfo(); /** * Returns an enumeration of all the available options.. * * @return an enumeration of all available options. */ @Override public Enumeration<Option> listOptions() { return (new Vector<Option>()).elements(); } /** * Gets the current option settings for the OptionHandler. * * @return the list of current option settings as an array of strings */ @Override public String[] getOptions() { return new String[0]; } /** * Sets the OptionHandler's options using the given list. All options will be * set (or reset) during this call (i.e. incremental setting of options is not * possible). * * @param options the list of options as an array of strings * @throws Exception if an option is not supported */ @Override public void setOptions(String[] options) throws Exception { // nothing in this class } /** * Tests if this enumeration contains more elements. * * @return true if and only if this enumeration object contains at least one * more element to provide; false otherwise. */ @Override public abstract boolean hasMoreElements(); /** * Returns the next element of this enumeration if this enumeration object has * at least one more element to provide. * * @return the next element of this enumeration. */ @Override public abstract String nextElement(); /** * Sets the string to tokenize. Tokenization happens immediately. * * @param s the string to tokenize */ public abstract void tokenize(String s); /** * initializes the given tokenizer with the given options and runs the * tokenizer over all the remaining strings in the options array. If no * strings remained in the option string then data is read from stdin, line by * line. * * @param tokenizer the tokenizer to use * @param options the options for the tokenizer * @return the tokenized strings * @throws Exception if setting of options or tokenization fails */ public static String[] tokenize(Tokenizer tokenizer, String[] options) throws Exception { Vector<String> result; Vector<String> tmpResult; Vector<String> data; int i; boolean processed; BufferedReader reader; String line; result = new Vector<String>(); // init tokenizer tokenizer.setOptions(options); // for storing the data to process data = new Vector<String>(); // run over all un-processed strings in the options array processed = false; for (i = 0; i < options.length; i++) { if (options[i].length() != 0) { processed = true; data.add(options[i]); } } // if no strings in option string then read from stdin if (!processed) { reader = new BufferedReader(new InputStreamReader(System.in)); while ((line = reader.readLine()) != null) { data.add(line); } } // process data for (i = 0; i < data.size(); i++) { tmpResult = new Vector<String>(); tokenizer.tokenize(data.get(i)); while (tokenizer.hasMoreElements()) { tmpResult.add(tokenizer.nextElement()); } // add to result result.addAll(tmpResult); } return result.toArray(new String[result.size()]); } /** * initializes the given tokenizer with the given options and runs the * tokenizer over all the remaining strings in the options array. The * generated tokens are then printed to stdout. If no strings remained in the * option string then data is read from stdin, line by line. * * @param tokenizer the tokenizer to use * @param options the options for the tokenizer */ public static void runTokenizer(Tokenizer tokenizer, String[] options) { String[] result; int i; try { result = tokenize(tokenizer, options); for (i = 0; i < result.length; i++) { System.out.println(result[i]); } } catch (Exception e) { e.printStackTrace(); } } }