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Java example source code file (DictionaryBasedBreakIteratorBuilder.java)

This example Java source code file (DictionaryBasedBreakIteratorBuilder.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

charset, dictionarybasedbreakiteratorbuilder, object, rulebasedbreakiteratorbuilder, string, util

The DictionaryBasedBreakIteratorBuilder.java Java example source code

/*
 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package build.tools.generatebreakiteratordata;

import java.util.Hashtable;
import java.util.Vector;

/**
 * The Builder class for DictionaryBasedBreakIterator inherits almost all of
 * its functionality from RuleBasedBreakIteratorBuilder, but extends it with
 * extra logic to handle the "<dictionary>" token.
 */
class DictionaryBasedBreakIteratorBuilder extends RuleBasedBreakIteratorBuilder {

    /**
     * A list of flags indicating which character categories are contained in
     * the dictionary file (this is used to determine which ranges of characters
     * to apply the dictionary to)
     */
    private boolean[] categoryFlags;

    /**
     * A CharSet that contains all the characters represented in the dictionary
     */
    private CharSet dictionaryChars = new CharSet();
    private String dictionaryExpression = "";

    public DictionaryBasedBreakIteratorBuilder(String description) {
        super(description);
    }

    /**
     * We override handleSpecialSubstitution() to add logic to handle
     * the <dictionary> tag.  If we see a substitution named "",
     * parse the substitution expression and store the result in
     * dictionaryChars.
     */
    protected void handleSpecialSubstitution(String replace, String replaceWith,
                                             int startPos, String description) {
        super.handleSpecialSubstitution(replace, replaceWith, startPos, description);

        if (replace.equals("<dictionary>")) {
            if (replaceWith.charAt(0) == '(') {
                error("Dictionary group can't be enclosed in (", startPos, description);
            }
            dictionaryExpression = replaceWith;
            dictionaryChars = CharSet.parseString(replaceWith);
        }
    }

    /**
     * The other half of the logic to handle the dictionary characters happens
     * here. After the inherited builder has derived the real character
     * categories, we set up the categoryFlags array in the iterator. This array
     * contains "true" for every character category that includes a dictionary
     * character.
     */
    protected void buildCharCategories(Vector<String> tempRuleList) {
        super.buildCharCategories(tempRuleList);

        categoryFlags = new boolean[categories.size()];
        for (int i = 0; i < categories.size(); i++) {
            CharSet cs = categories.elementAt(i);
            if (!(cs.intersection(dictionaryChars).empty())) {
                categoryFlags[i] = true;
            }
        }
    }

    // This function is actually called by
    // RuleBasedBreakIteratorBuilder.buildCharCategories(), which is called by
    // the function above. This gives us a way to create a separate character
    // category for the dictionary characters even when
    // RuleBasedBreakIteratorBuilder isn't making a distinction.
    protected void mungeExpressionList(Hashtable<String, Object> expressions) {
        expressions.put(dictionaryExpression, dictionaryChars);
    }

    void makeFile(String filename) {
        super.setAdditionalData(super.toByteArray(categoryFlags));
        super.makeFile(filename);
    }
}

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