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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
/*
* StringHelper.java
*
* Created on March 3, 2000
*/
package com.sun.jdo.spi.persistence.utility;
import java.util.*;
/**
* NOTE: These utilities have been moved from another (more specific
* package's) utility class so that more classes can have access to them.
* There can be some refactoring work to combine these with some of the
* methods in the StringScanner class.
*
*/
public class StringHelper
{
/**
* constants for escape
*/
private static final char BACKSLASH = '\\';
private static final char QUOTE = '"';
/** Convert an array of objects into a separated string. This method
* assumes there is no instance of the separator in the strings of list.
* @param list The list of objects to be expanded.
* @param beginIndex The index of the first element in the list to be used.
* @param endIndex The index of the last element in the list to be used.
* @param separator The separator to be used between strings.
* @return a string representing the expanded list.
*/
public static String arrayToSeparatedList (List list, int beginIndex,
int endIndex, String separator)
{
StringBuffer result = new StringBuffer();
if (list != null)
{
int i, count = (endIndex + 1);
if ((count > beginIndex) && (list.size() >= count))
result.append(list.get(beginIndex));
for (i = beginIndex + 1; i < count; i++)
result.append(separator + list.get(i));
}
return result.toString();
}
/** Convert an array of objects into a separated string using the default
* separator. This method assumes there is no instance of the separator
* in the strings of list.
* @param list The list of objects to be expanded.
* @param beginIndex The index of the first element in the list to be used.
* @param endIndex The index of the last element in the list to be used.
* @return a string representing the expanded list.
*/
public static String arrayToSeparatedList (List list, int beginIndex,
int endIndex)
{
return arrayToSeparatedList(list, beginIndex, endIndex, ","); // NOI18N
}
/** Convert an array of objects into a separated string using the specified
* separator and the entire array. This method assumes there is no
* instance of the separator in the strings of list.
* @param list The list of objects to be expanded.
* @param separator The separator to be used between strings.
* @return a string representing the expanded list.
*/
public static String arrayToSeparatedList (List list, String separator)
{
return arrayToSeparatedList(list, 0,
((list != null) ? (list.size() - 1) : 0), separator);
}
/** Convert an array of objects into a separated string using the default
* separator and the entire array. This method assumes there is no
* instance of the separator in the strings of list.
* @param list The list of objects to be expanded.
* @return a string representing the expanded list.
*/
public static String arrayToSeparatedList (List list)
{
return arrayToSeparatedList(list, 0,
((list != null) ? (list.size() - 1) : 0));
}
/** Convert a separated string to an array of strings
* @param list The string representing the list of objects.
* @param separator The separator to be used to tokenize strings.
* @return an array representing the tokenized list.
*/
public static List separatedListToArray (String list, String separator)
{
ArrayList result = new ArrayList();
if (list != null)
{
StringTokenizer st = new StringTokenizer(list, separator);
int i, size = st.countTokens();
for (i = 0; i < size; i++)
result.add(st.nextToken());
}
return result;
}
/** Convert a separated string to an array of strings using the default
* separator.
* @param list The string representing the list of objects.
* @return an array representing the tokenized list.
*/
public static List separatedListToArray (String list)
{
return separatedListToArray(list, ","); // NOI18N
}
/** Convert an array of int values into a separated string.
* @param intArray The array of int values to be expanded.
* @param separator The separator to be used between strings.
* @return a string representing the expanded array.
*/
public static String intArrayToSeparatedList(int[] intArray,
String separator)
{
return intArrayToSeparatedList(intArray, 0,
((intArray != null) ? (intArray.length - 1) : 0), separator);
}
/** Convert an array of int values into a separated string.
* @param intArray The array of int values to be expanded.
* @param beginIndex The index of the first element in the array to be used.
* @param endIndex The index of the last element in the array to be used.
* @param separator The separator to be used between strings.
* @return a string representing the expanded array.
*/
public static String intArrayToSeparatedList(int[] intArray, int beginIndex,
int endIndex, String separator)
{
StringBuffer result = new StringBuffer();
if (intArray != null)
{
int count = (endIndex + 1);
if ((count > beginIndex) && (intArray.length >= count))
result.append(intArray[beginIndex]);
for (int i = beginIndex + 1; i < count; i++) {
result.append(separator);
result.append(intArray[i]);
}
}
return result.toString();
}
/** Checks if a string is null or empty.
* @return true if the string is null or empty after trim,
* false otherwirse.
*/
public static boolean isEmpty (String aString)
{
return ((aString == null) || (aString.trim().length() == 0));
}
/** Gets a version of the specified string with the first letter
* capitalized. This can be used to convert a field name to get and set
* method names.
* @param aString the string to be capitalized
* @return a capitalized for the specified string
*/
public static String getCapitalizedString (String aString)
{
if (isEmpty(aString))
return aString;
return Character.toUpperCase(aString.charAt(0)) + aString.substring(1);
}
/** Replaces the first occurence of oldString in string
* with newString. The methods returns either a new string
* instance (in the case oldString is included in the string)
* or the origial string itself (in the case oldString is not
* included).
* @param string the original string.
* @param oldString the string to be replaced.
* @param newString the string the old value is replaced with.
* @return a string derived from the specified this string by replacing the
* first occurence oldString with newString.
*/
public static String replaceFirst (String string, String oldString, String newString)
{
int index = string.indexOf(oldString);
if (index != -1) {
StringBuffer sb = new StringBuffer(string.length());
sb.append(string.substring(0, index));
sb.append(newString);
sb.append(string.substring(index + oldString.length()));
return sb.toString();
}
return string;
}
/** Replaces all occurences of oldString in string
* with newString. The methods returns either a new string
* instance (in the case oldString is included in the string)
* or the origial string itself (in the case oldString is not
* included).
* @param string the original string.
* @param oldString the string to be replaced.
* @param newString the string the old value is replaced with.
* @return a string derived from the specified this string by replacing
* every occurrence of oldString with newString.
*/
public static String replace (String string, String oldString,
String newString)
{
StringBuffer sb = null;
final int l = oldString.length();
int beginIndex = 0;
int index;
while ((index = string.indexOf(oldString, beginIndex)) > -1)
{
// only create the StringBuffer if there's an occurence of oldString
if (sb == null)
{
sb = new StringBuffer(string.length());
}
sb.append(string.substring(beginIndex, index));
sb.append(newString);
beginIndex = index + l;
}
// append the rest if the old value was found at least once
if (sb != null)
{
sb.append(string.substring(beginIndex));
}
return (sb != null ? sb.toString() : string);
}
/**
* Trims trailing spaces from input.
* @param input The input string.
* @return A new string with trailing spaces trimmed. If there are no
* trailing spaces, returns input.
*/
public static String rtrim (String input)
{
String retVal = input;
if (input != null)
{
int lastCharIndex = input.length() - 1;
int originalLastCharIndex = lastCharIndex;
while ((lastCharIndex >= 0) &&
Character.isSpaceChar(input.charAt(lastCharIndex)))
{
lastCharIndex--;
}
if (lastCharIndex != originalLastCharIndex)
{
//We have characters to trim.
retVal = input.substring(0,lastCharIndex + 1);
}
}
return retVal;
}
/**
* Escaping given string by " and \.
* @param str String to be escaped
* @return string escaped by " and \.
*/
public static String escape(String str)
{
if (str == null)
{
return str;
}
else
{
int indS = str.indexOf(BACKSLASH);
int indQ = str.indexOf(QUOTE);
if (indS == -1 && indQ == -1)
{
return str;
}
else
{
StringBuffer buf = new StringBuffer();
char data[] = str.toCharArray();
for (int i = 0; i < data.length; i++)
{
if (BACKSLASH == data[i] || QUOTE == data[i])
{
buf.append(BACKSLASH);
}
buf.append(data[i]);
}
return buf.toString();
}
}
}
}