Replaces all instances of oldString with newString in string : String replace « Data Type « Java
Replaces all instances of oldString with newString in string
/**
* $Revision: 10205 $
* $Date: 2008-04-11 15:48:27 -0700 (Fri, 11 Apr 2008) $
*
* Copyright (C) 2004-2008 Jive Software. All rights reserved.
*
* This software is published under the terms of the GNU Public License (GPL),
* a copy of which is included in this distribution, or a commercial license
* agreement with Jive.
*/
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.BreakIterator;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
/**
* Utility class to peform common String manipulation algorithms.
*/
public class StringUtils {
// Constants used by escapeHTMLTags
private static final char[] QUOTE_ENCODE = """.toCharArray();
private static final char[] AMP_ENCODE = "&".toCharArray();
private static final char[] LT_ENCODE = "<".toCharArray();
private static final char[] GT_ENCODE = ">".toCharArray();
private StringUtils() {
// Not instantiable.
}
/**
* Replaces all instances of oldString with newString in string.
*
* @param string the String to search to perform replacements on.
* @param oldString the String that should be replaced by newString.
* @param newString the String that will replace all instances of oldString.
* @return a String will all instances of oldString replaced by newString.
*/
public static String replace(String string, String oldString, String newString) {
if (string == null) {
return null;
}
int i = 0;
// Make sure that oldString appears at least once before doing any processing.
if ((i = string.indexOf(oldString, i)) >= 0) {
// Use char []'s, as they are more efficient to deal with.
char[] string2 = string.toCharArray();
char[] newString2 = newString.toCharArray();
int oLength = oldString.length();
StringBuilder buf = new StringBuilder(string2.length);
buf.append(string2, 0, i).append(newString2);
i += oLength;
int j = i;
// Replace all remaining instances of oldString with newString.
while ((i = string.indexOf(oldString, i)) > 0) {
buf.append(string2, j, i - j).append(newString2);
i += oLength;
j = i;
}
buf.append(string2, j, string2.length - j);
return buf.toString();
}
return string;
}
/**
* Replaces all instances of oldString with newString in line with the
* added feature that matches of newString in oldString ignore case.
*
* @param line the String to search to perform replacements on
* @param oldString the String that should be replaced by newString
* @param newString the String that will replace all instances of oldString
* @return a String will all instances of oldString replaced by newString
*/
public static String replaceIgnoreCase(String line, String oldString,
String newString) {
if (line == null) {
return null;
}
String lcLine = line.toLowerCase();
String lcOldString = oldString.toLowerCase();
int i = 0;
if ((i = lcLine.indexOf(lcOldString, i)) >= 0) {
char[] line2 = line.toCharArray();
char[] newString2 = newString.toCharArray();
int oLength = oldString.length();
StringBuilder buf = new StringBuilder(line2.length);
buf.append(line2, 0, i).append(newString2);
i += oLength;
int j = i;
while ((i = lcLine.indexOf(lcOldString, i)) > 0) {
buf.append(line2, j, i - j).append(newString2);
i += oLength;
j = i;
}
buf.append(line2, j, line2.length - j);
return buf.toString();
}
return line;
}
/**
* Replaces all instances of oldString with newString in line with the
* added feature that matches of newString in oldString ignore case.
* The count paramater is set to the number of replaces performed.
*
* @param line the String to search to perform replacements on
* @param oldString the String that should be replaced by newString
* @param newString the String that will replace all instances of oldString
* @param count a value that will be updated with the number of replaces
* performed.
* @return a String will all instances of oldString replaced by newString
*/
public static String replaceIgnoreCase(String line, String oldString,
String newString, int[] count)
{
if (line == null) {
return null;
}
String lcLine = line.toLowerCase();
String lcOldString = oldString.toLowerCase();
int i = 0;
if ((i = lcLine.indexOf(lcOldString, i)) >= 0) {
int counter = 1;
char[] line2 = line.toCharArray();
char[] newString2 = newString.toCharArray();
int oLength = oldString.length();
StringBuilder buf = new StringBuilder(line2.length);
buf.append(line2, 0, i).append(newString2);
i += oLength;
int j = i;
while ((i = lcLine.indexOf(lcOldString, i)) > 0) {
counter++;
buf.append(line2, j, i - j).append(newString2);
i += oLength;
j = i;
}
buf.append(line2, j, line2.length - j);
count[0] = counter;
return buf.toString();
}
return line;
}
/**
* Replaces all instances of oldString with newString in line.
* The count Integer is updated with number of replaces.
*
* @param line the String to search to perform replacements on.
* @param oldString the String that should be replaced by newString.
* @param newString the String that will replace all instances of oldString.
* @return a String will all instances of oldString replaced by newString.
*/
public static String replace(String line, String oldString,
String newString, int[] count)
{
if (line == null) {
return null;
}
int i = 0;
if ((i = line.indexOf(oldString, i)) >= 0) {
int counter = 1;
char[] line2 = line.toCharArray();
char[] newString2 = newString.toCharArray();
int oLength = oldString.length();
StringBuilder buf = new StringBuilder(line2.length);
buf.append(line2, 0, i).append(newString2);
i += oLength;
int j = i;
while ((i = line.indexOf(oldString, i)) > 0) {
counter++;
buf.append(line2, j, i - j).append(newString2);
i += oLength;
j = i;
}
buf.append(line2, j, line2.length - j);
count[0] = counter;
return buf.toString();
}
return line;
}
}
