Java String Wrap getWrappedLine(String line, int lineLength)

Description

Inserts newlines at or before lineLength at spaces or commas.

License

Open Source License

Parameter

Parameter	Description
line	the line to word-wrap
lineLength	the maximum length any segment should be.

Return

a line with newlines inserted

Declaration

public static String getWrappedLine(String line, int lineLength) 

Method Source Code

//package com.java2s;
/*/* w  w  w. j ava2  s  . c om*/
 * Copyright (C) 2001-2004 Colin Bell
 * colbell@users.sourceforge.net
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import java.util.ArrayList;
import java.util.Iterator;

public class Main {
    /**
     * Inserts newlines at or before lineLength at spaces or commas. If no space 
     * or comma can be found, the resultant line will not be broken up by 
     * newlines.
     * 
     * @param line the line to word-wrap
     * @param lineLength the maximum length any segment should be. 
     * @return a line with newlines inserted
     */
    public static String getWrappedLine(String line, int lineLength) {
        if (line.length() <= lineLength) {
            return line;
        }
        StringBuffer result = new StringBuffer();
        char[] lineChars = line.toCharArray();
        int lastBreakCharIdx = -1;
        ArrayList<Integer> breakPoints = new ArrayList<Integer>();

        // look for places to break the string
        for (int i = 0; i < lineChars.length; i++) {
            char curr = lineChars[i];
            if (curr == ' ' || curr == ',') {
                lastBreakCharIdx = i;
            }
            if (i > 0 && (i % lineLength == 0) && lastBreakCharIdx != -1) {
                breakPoints.add(Integer.valueOf(lastBreakCharIdx));
            }
        }
        if (lastBreakCharIdx != lineChars.length) {
            breakPoints.add(Integer.valueOf(lineChars.length));
        }
        int lastBreakPointIdx = 0;
        for (Iterator<Integer> iter = breakPoints.iterator(); iter.hasNext();) {
            int breakPointIdx = (iter.next()).intValue() + 1;
            if (breakPointIdx > line.length()) {
                breakPointIdx = line.length();
            }
            String part = line.substring(lastBreakPointIdx, breakPointIdx);
            result.append(part.trim());
            if (!part.trim().endsWith("\\n")) {
                result.append("\n");
            }
            lastBreakPointIdx = breakPointIdx;
        }
        return result.toString();
    }
}

Related

1. getWordWrappedText(int maxWidth, String... lines)
2. lineWrap(String text, int width, boolean shiftNewLines)
3. wordWrap(final String rawString, final int lineLength)
4. wordWrap(String entry)
5. wordWrap(String input, int width)