If the string is longer than 79 characters, split it up by adding newlines in all newline delimited substrings that are longer than 79 characters. - Java java.lang

Java examples for java.lang:String Substring

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Description

If the string is longer than 79 characters, split it up by adding newlines in all newline delimited substrings that are longer than 79 characters.

Demo Code

/* Utilities used to manipulate strings.

 Copyright (c) 2002-2006 The Regents of the University of California.
 All rights reserved.//from  w w  w .  ja va2s .  c  om
 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the above
 copyright notice and the following two paragraphs appear in all copies
 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

 PT_COPYRIGHT_VERSION_2
 COPYRIGHTENDKEY

 */
//package com.java2s;

import java.util.StringTokenizer;

public class Main {
    public static void main(String[] argv) {
        String longName = "java2s.com";
        System.out.println(split(longName));
    }

    /** The line separator string.  Under Windows, this would
     *  be "\r\n"; under Unix, "\n"; Under Macintosh, "\r".
     */
    public static final String LINE_SEPARATOR = System
            .getProperty("line.separator");

    /**  If the string is longer than 79 characters, split it up by
     *  adding newlines in all newline delimited substrings
     *  that are longer than 79 characters.
     *  If the <i>longName</i> argument is null, then the string
     *  "&gt;Unnamed&lt;" is returned.
     *  @see #abbreviate(String)
     *  @see #split(String, int)
     *  @param longName The string to optionally split up
     *  @return Either the original string, or the string with newlines
     *  inserted.
     */
    public static String split(String longName) {
        return split(longName, 79);
    }

    /** If the string is longer than <i>length</i> characters,
     *  split the string up by adding newlines in all
     *  newline delimited substrings that are longer than <i>length</i>
     *  characters.
     *  If the <i>longName</i> argument is null, then the string
     *  "&gt;Unnamed&lt;" is returned.
     *  @see #abbreviate(String)
     *  @see #split(String)
     *  @param longName The string to optionally split.
     *  @param length The maximum length of the sequence of characters
     *  before a newline is inserted.
     *  @return Either the original string, or the string with newlines
     *  inserted.
     */
    public static String split(String longName, int length) {
        if (longName == null) {
            return "<Unnamed>";
        }

        if (longName.length() <= length) {
            return longName;
        }

        StringBuffer results = new StringBuffer();

        // The third argument is true, which means return the delimiters
        // as part of the tokens.
        StringTokenizer tokenizer = new StringTokenizer(longName,
                LINE_SEPARATOR, true);

        while (tokenizer.hasMoreTokens()) {
            String token = tokenizer.nextToken();
            int mark = 0;

            while (mark < (token.length() - length)) {
                // We look for the space from the end of the first length
                // characters.  If we find one, then we use that
                // as the place to insert a newline.
                int lastSpaceIndex = token.substring(mark, mark + length)
                        .lastIndexOf(" ");

                if (lastSpaceIndex < 0) {
                    // No space found, just insert a new line after length
                    results.append(token.substring(mark, mark + length)
                            + LINE_SEPARATOR);
                    mark += length;
                } else {
                    results.append(token.substring(mark, mark
                            + lastSpaceIndex)
                            + LINE_SEPARATOR);
                    mark += (lastSpaceIndex + 1);
                }
            }

            results.append(token.substring(mark));
        }

        return results.toString();
    }
}

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