Mega Code Archive
Left justify the contents of the string, ensuring that the supplied string begins at the first character and that the resulting
<![CDATA[
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/*
* JBoss DNA (http://www.jboss.org/dna)
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
* See the AUTHORS.txt file in the distribution for a full listing of
* individual contributors.
*
* JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA
* is licensed to you 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.
*
* JBoss DNA 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
/**
* Utilities for string processing and manipulation.
*/
public class StringUtil {
/**
* Left justify the contents of the string, ensuring that the supplied string begins at the first character and that the
* resulting string is of the desired length. If the supplied string is longer than the desired width, it is truncated to the
* specified length. If the supplied string is shorter than the desired width, the padding character is added to the end of
* the string one or more times such that the length is that specified. All leading and trailing whitespace is removed.
*
* @param str the string to be left justified; if null, an empty string is used
* @param width the desired width of the string; must be positive
* @param padWithChar the character to use for padding, if needed
* @return the left justified string
* @see #setLength(String, int, char)
*/
public static String justifyLeft( String str,
final int width,
char padWithChar ) {
return justifyLeft(str, width, padWithChar, true);
}
protected static String justifyLeft(String str, final int width, char padWithChar,
boolean trimWhitespace) {
// Trim the leading and trailing whitespace ...
str = str != null ? (trimWhitespace ? str.trim() : str) : "";
int addChars = width - str.length();
if (addChars < 0) {
// truncate
return str.subSequence(0, width).toString();
}
// Write the content ...
final StringBuilder sb = new StringBuilder();
sb.append(str);
// Append the whitespace ...
while (addChars > 0) {
sb.append(padWithChar);
--addChars;
}
return sb.toString();
}
}
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