package org.opends.build.tools;
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import org.opends.messages.Message;
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import java.util.StringTokenizer;
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/**
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*/
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public class Utilities {
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/**
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* The end-of-line character for this platform.
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*/
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public static final String EOL = System.getProperty("line.separator");
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/**
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* Inserts line breaks into the provided buffer to wrap text at no more than
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* the specified column width. Wrapping will only be done at space boundaries
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* and if there are no spaces within the specified width, then wrapping will
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* be performed at the first space after the specified column.
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*
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* @param text The text to be wrapped.
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* @param width The maximum number of characters to allow on a line if there
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* is a suitable breaking point.
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*
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* @return The wrapped text.
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*/
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public static String wrapText(String text, int width)
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{
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StringBuilder buffer = new StringBuilder();
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StringTokenizer lineTokenizer = new StringTokenizer(text, "\r\n", true);
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while (lineTokenizer.hasMoreTokens())
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{
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String line = lineTokenizer.nextToken();
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if (line.equals("\r") || line.equals("\n"))
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{
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// It's an end-of-line character, so append it as-is.
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buffer.append(line);
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}
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else if (line.length() < width)
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{
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// The line fits in the specified width, so append it as-is.
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buffer.append(line);
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}
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else
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{
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// The line doesn't fit in the specified width, so it needs to be
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// wrapped. Do so at space boundaries.
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StringBuilder lineBuffer = new StringBuilder();
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StringBuilder delimBuffer = new StringBuilder();
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StringTokenizer wordTokenizer = new StringTokenizer(line, " ", true);
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while (wordTokenizer.hasMoreTokens())
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{
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String word = wordTokenizer.nextToken();
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if (word.equals(" "))
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{
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// It's a space, so add it to the delim buffer only if the line
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// buffer is not empty.
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if (lineBuffer.length() > 0)
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{
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delimBuffer.append(word);
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}
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}
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else if (word.length() > width)
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{
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// This is a long word that can't be wrapped, so we'll just have to
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// make do.
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if (lineBuffer.length() > 0)
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{
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buffer.append(lineBuffer);
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buffer.append(EOL);
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lineBuffer = new StringBuilder();
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}
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buffer.append(word);
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if (wordTokenizer.hasMoreTokens())
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{
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// The next token must be a space, so remove it. If there are
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// still more tokens after that, then append an EOL.
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wordTokenizer.nextToken();
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if (wordTokenizer.hasMoreTokens())
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{
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buffer.append(EOL);
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}
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}
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if (delimBuffer.length() > 0)
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{
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delimBuffer = new StringBuilder();
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}
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}
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else
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{
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// It's not a space, so see if we can fit it on the curent line.
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int newLineLength = lineBuffer.length() + delimBuffer.length() +
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word.length();
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if (newLineLength < width)
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{
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// It does fit on the line, so add it.
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lineBuffer.append(delimBuffer).append(word);
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if (delimBuffer.length() > 0)
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{
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delimBuffer = new StringBuilder();
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}
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}
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else
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{
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// It doesn't fit on the line, so end the current line and start
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// a new one.
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buffer.append(lineBuffer);
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buffer.append(EOL);
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lineBuffer = new StringBuilder();
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lineBuffer.append(word);
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if (delimBuffer.length() > 0)
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{
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delimBuffer = new StringBuilder();
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}
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}
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}
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}
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// If there's anything left in the line buffer, then add it to the
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// final buffer.
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buffer.append(lineBuffer);
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}
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}
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return buffer.toString();
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}
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}
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