/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
* add the following below this CDDL HEADER, with the fields enclosed
* by brackets "[]" replaced with your own identifying information:
* Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
*
* Copyright 2008 Sun Microsystems, Inc.
*/
package org.opends.build.tools;
import java.util.StringTokenizer;
/**
*/
public class Utilities {
/**
* The end-of-line character for this platform.
*/
public static final String EOL = System.getProperty("line.separator");
/**
* Inserts line breaks into the provided buffer to wrap text at no more than
* the specified column width. Wrapping will only be done at space boundaries
* and if there are no spaces within the specified width, then wrapping will
* be performed at the first space after the specified column.
*
* @param text The text to be wrapped.
* @param width The maximum number of characters to allow on a line if there
* is a suitable breaking point.
*
* @return The wrapped text.
*/
public static String wrapText(String text, int width)
{
StringBuilder buffer = new StringBuilder();
StringTokenizer lineTokenizer = new StringTokenizer(text, "\r\n", true);
while (lineTokenizer.hasMoreTokens())
{
String line = lineTokenizer.nextToken();
if (line.equals("\r") || line.equals("\n"))
{
// It's an end-of-line character, so append it as-is.
buffer.append(line);
}
else if (line.length() < width)
{
// The line fits in the specified width, so append it as-is.
buffer.append(line);
}
else
{
// The line doesn't fit in the specified width, so it needs to be
// wrapped. Do so at space boundaries.
StringBuilder lineBuffer = new StringBuilder();
StringBuilder delimBuffer = new StringBuilder();
StringTokenizer wordTokenizer = new StringTokenizer(line, " ", true);
while (wordTokenizer.hasMoreTokens())
{
String word = wordTokenizer.nextToken();
if (word.equals(" "))
{
// It's a space, so add it to the delim buffer only if the line
// buffer is not empty.
if (lineBuffer.length() > 0)
{
delimBuffer.append(word);
}
}
else if (word.length() > width)
{
// This is a long word that can't be wrapped, so we'll just have to
// make do.
if (lineBuffer.length() > 0)
{
buffer.append(lineBuffer);
buffer.append(EOL);
lineBuffer = new StringBuilder();
}
buffer.append(word);
if (wordTokenizer.hasMoreTokens())
{
// The next token must be a space, so remove it. If there are
// still more tokens after that, then append an EOL.
wordTokenizer.nextToken();
if (wordTokenizer.hasMoreTokens())
{
buffer.append(EOL);
}
}
if (delimBuffer.length() > 0)
{
delimBuffer = new StringBuilder();
}
}
else
{
// It's not a space, so see if we can fit it on the curent line.
int newLineLength = lineBuffer.length() + delimBuffer.length() +
word.length();
if (newLineLength < width)
{
// It does fit on the line, so add it.
lineBuffer.append(delimBuffer).append(word);
if (delimBuffer.length() > 0)
{
delimBuffer = new StringBuilder();
}
}
else
{
// It doesn't fit on the line, so end the current line and start
// a new one.
buffer.append(lineBuffer);
buffer.append(EOL);
lineBuffer = new StringBuilder();
lineBuffer.append(word);
if (delimBuffer.length() > 0)
{
delimBuffer = new StringBuilder();
}
}
}
}
// If there's anything left in the line buffer, then add it to the
// final buffer.
buffer.append(lineBuffer);
}
}
return buffer.toString();
}
}