Utils.java Source code

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Here is the source code for Utils.java

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/*
 * $Id: Utilities.java,v 1.11 2008/10/14 22:31:46 rah003 Exp $
 *
 * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

import java.text.BreakIterator;
import java.util.StringTokenizer;

/**
 * Contribution from NetBeans: Issue #319-swingx.
 * 
 * 
 * PENDING: need to reconcile with OS, JVM... added as-is because needed the
 * shortcut handling to fix #
 * 
 * @author apple
 */
public class Utils {

    /**
     * Wrap multi-line strings (and get the individual lines).
     * 
     * @param original
     *          the original string to wrap
     * @param width
     *          the maximum width of lines
     * @param breakIterator
     *          breaks original to chars, words, sentences, depending on what
     *          instance you provide.
     * @param removeNewLines
     *          if <code>true</code>, any newlines in the original string are
     *          ignored
     * @return the lines after wrapping
     */
    public static String[] wrapStringToArray(String original, int width, BreakIterator breakIterator,
            boolean removeNewLines) {
        if (original.length() == 0) {
            return new String[] { original };
        }

        String[] workingSet;

        // substitute original newlines with spaces,
        // remove newlines from head and tail
        if (removeNewLines) {
            original = trimString(original);
            original = original.replace('\n', ' ');
            workingSet = new String[] { original };
        } else {
            StringTokenizer tokens = new StringTokenizer(original, "\n"); // NOI18N
            int len = tokens.countTokens();
            workingSet = new String[len];

            for (int i = 0; i < len; i++) {
                workingSet[i] = tokens.nextToken();
            }
        }

        if (width < 1) {
            width = 1;
        }

        if (original.length() <= width) {
            return workingSet;
        }

        widthcheck: {
            boolean ok = true;

            for (int i = 0; i < workingSet.length; i++) {
                ok = ok && (workingSet[i].length() < width);

                if (!ok) {
                    break widthcheck;
                }
            }

            return workingSet;
        }

        java.util.ArrayList<String> lines = new java.util.ArrayList<String>();

        int lineStart = 0; // the position of start of currently processed line in
                           // the original string

        for (int i = 0; i < workingSet.length; i++) {
            if (workingSet[i].length() < width) {
                lines.add(workingSet[i]);
            } else {
                breakIterator.setText(workingSet[i]);

                int nextStart = breakIterator.next();
                int prevStart = 0;

                do {
                    while (((nextStart - lineStart) < width) && (nextStart != BreakIterator.DONE)) {
                        prevStart = nextStart;
                        nextStart = breakIterator.next();
                    }

                    if (nextStart == BreakIterator.DONE) {
                        nextStart = prevStart = workingSet[i].length();
                    }

                    if (prevStart == 0) {
                        prevStart = nextStart;
                    }

                    lines.add(workingSet[i].substring(lineStart, prevStart));

                    lineStart = prevStart;
                    prevStart = 0;
                } while (lineStart < workingSet[i].length());

                lineStart = 0;
            }
        }

        String[] s = new String[lines.size()];

        return (String[]) lines.toArray(s);
    }

    private static String trimString(String s) {
        int idx = 0;
        char c;
        final int slen = s.length();

        if (slen == 0) {
            return s;
        }

        do {
            c = s.charAt(idx++);
        } while (((c == '\n') || (c == '\r')) && (idx < slen));

        s = s.substring(--idx);
        idx = s.length() - 1;

        if (idx < 0) {
            return s;
        }

        do {
            c = s.charAt(idx--);
        } while (((c == '\n') || (c == '\r')) && (idx >= 0));

        return s.substring(0, idx + 2);
    }
}