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JSF components and utilities that can be used with any JSF implementation.
This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build
changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this
version of the Tomahawk library.
The newest version!
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.myfaces.shared_tomahawk.util;
import java.util.ArrayList;
/**
* Implements utility functions for the String class
*
*
* Emphasis on performance and reduced memory allocation/garbage collection
* in exchange for longer more complex code.
*
*
* @author Anton Koinov (latest modification by $Author: lu4242 $)
* @version $Revision: 1239799 $ $Date: 2012-02-02 15:00:42 -0500 (Thu, 02 Feb 2012) $
*/
public final class StringUtils
{
private StringUtils()
{
// utility class, no instantiation
}
//~ Methods ------------------------------------------------------------------------------------
/**
* Checks that the string represents a floating point number that CANNOT be
* in exponential notation
*
* @param str the string to check
*
* @return boolean
*/
public static boolean isFloatNoExponent(String str)
{
int len = str.length();
if (len == 0)
{
return false;
}
// skip first char if sign char
char c = str.charAt(0);
int i = ((c == '-') || (c == '+')) ? 1 : 0;
// is it only a sign?
if (i >= len)
{
return false;
}
boolean decimalPointFound = false;
do
{
c = str.charAt(i);
if (c == '.')
{
// is this a second dot?
if (decimalPointFound)
{
return false;
}
decimalPointFound = true;
}
else if (!Character.isDigit(c))
{
return false;
}
i++;
}
while (i < len);
return true;
}
public static boolean isFloatWithOptionalExponent(String str)
{
int len = str.length();
if (len == 0)
{
return false;
}
// skip first char if sign char
char c = str.charAt(0);
int i = ((c == '-') || (c == '+')) ? 1 : 0;
// is it only a sign?
if (i >= len)
{
return false;
}
boolean exponentFound = false;
boolean decimalPointFound = false;
do
{
c = str.charAt(i);
switch (c)
{
case '.':
// is this a second one, are we in the exponent?
if (decimalPointFound || exponentFound)
{
return false;
}
decimalPointFound = true;
break;
case 'e':
case 'E':
// is this a second one?
if (exponentFound)
{
return false;
}
exponentFound = true;
// check for exponent sign
c = str.charAt(i + 1);
if ((c == '-') || (c == '+'))
{
i++;
}
break;
default:
if (!Character.isDigit(c))
{
return false;
}
}
i++;
}
while (i < len);
return true;
}
public static boolean isInteger(String str)
{
int len = str.length();
if (len == 0)
{
return false;
}
// skip first char if sign char
char c = str.charAt(0);
int i = ((c == '-') || (c == '+')) ? 1 : 0;
// is it only a sign?
if (i >= len)
{
return false;
}
do
{
if (!Character.isDigit(str.charAt(i)))
{
return false;
}
i++;
}
while (i < len);
return true;
}
public static boolean isUnsignedInteger(String str)
{
int len = str.length();
if (len == 0)
{
return false;
}
for (int i = 0; i < len; i++)
{
if (!Character.isDigit(str.charAt(i)))
{
return false;
}
}
return true;
}
/**
* Undoubles the quotes inside the string
Example:
*
* hello""world becomes hello"world
*
*
* @param str input string to dequote
* @param quote the quoting char
*
* @return dequoted string
*/
public static String dequote(String str, char quote)
{
// Is there anything to dequote?
if (str == null)
{
return null;
}
return dequote(str, 0, str.length(), quote);
}
/**
* Undoubles the quotes inside a substring
Example:
*
* hello""world becomes hello"world
*
* WARNING: scan for quote may continue to the end of the string, make sure
* that either charAt(end + 1) == quote or end =
* str.lentgth(). If in doubt call
* dequote(str.substring(begin, end), quote)
*
* @param str input string from which to get the substring, must not be
* null
* @param begin begin index for substring
* @param end end index for substring
* @param quote the quoting char
*
* @return dequoted string
*
* @throws IllegalArgumentException if string is incorrectly quoted
*/
public static String dequote(String str, int begin, int end, char quote)
{
// Is there anything to dequote?
if (begin == end)
{
return "";
}
int endInt = str.indexOf(quote, begin);
// If no quotes, return the original string
// and save StringBuilder allocation/char copying
if (endInt < 0)
{
return str.substring(begin, end);
}
StringBuilder sb = new StringBuilder(end - begin);
int beginInt = begin; // need begin later
do
{
if (((endInt + 1) >= end) || (str.charAt(endInt + 1) != quote))
{
throw new IllegalArgumentException(
"Internal quote not doubled in string '"
+ str.substring(begin, end) + "'");
}
sb.append(substring(str, beginInt, endInt)).append(quote);
beginInt = endInt + 2;
endInt = str.indexOf(quote, beginInt);
}
while ((endInt >= 0) && (endInt < end));
return sb.append(substring(str, beginInt, end)).toString();
}
/**
* Removes the surrounding quote and any double quote inside the string
* Example:
*
* "hello""world" becomes hello"world
*
*
* @param str input string to dequote
* @param quote the quoting char
*
* @return dequoted String
*/
public static String dequoteFull(String str, char quote)
{
if (str == null)
{
return null;
}
return dequoteFull(str, 0, str.length(), quote);
}
public static String dequoteFull(String str, int begin, int end, char quote)
{
// If empty substring, return empty string
if (begin == end)
{
return "";
}
// If not quoted, return string
if (str.charAt(begin) != quote)
{
return str.substring(begin, end);
}
int endInt = end - 1;
if ((str.length() < 2) || (str.charAt(endInt) != quote))
{
throw new IllegalArgumentException(
"Closing quote missing in string '"
+ substring(str, begin, end) + "'");
}
return dequote(str, begin + 1, endInt, quote);
}
public static String replace(String str, String repl, String with)
{
int lastindex = 0;
int pos = str.indexOf(repl);
// If no replacement needed, return the original string
// and save StringBuilder allocation/char copying
if (pos < 0)
{
return str;
}
int len = repl.length();
int lendiff = with.length() - repl.length();
StringBuilder out =
new StringBuilder((lendiff <= 0) ? str.length()
: (str.length() + (10 * lendiff)));
while(pos >= 0)
{
out.append(substring(str, lastindex, pos)).append(with);
lastindex = pos + len;
pos = str.indexOf(repl, lastindex);
}
return out.append(substring(str, lastindex, str.length())).toString();
}
public static String replace(String str, char repl, String with)
{
int pos = str.indexOf(repl);
// If no replacement needed, return the original string
// and save StringBuilder allocation/char copying
if (pos < 0)
{
return str;
}
int len = str.length();
int lendiff = with.length() - 1;
StringBuilder out =
new StringBuilder((lendiff <= 0) ? str.length()
: (str.length() + (10 * lendiff)));
int lastindex = 0;
while( pos >= 0)
{
out.append(substring(str, lastindex, pos)).append(with);
lastindex = pos + 1;
pos = str.indexOf(repl, lastindex);
}
return out.append(substring(str, lastindex, len)).toString();
}
public static StringBuffer replace(
StringBuffer out, String s, String repl, String with)
{
int lastindex = 0;
int len = repl.length();
int index = s.indexOf(repl);
while (index >= 0)
{
// we have search string at position index
out.append(substring(s, lastindex, index)).append(with);
lastindex = index + len;
index = s.indexOf(repl, lastindex);
}
return out.append(substring(s, lastindex, len));
}
public static StringBuilder replace(
StringBuilder out, String s, String repl, String with)
{
int lastindex = 0;
int len = repl.length();
int index = s.indexOf(repl);
while (index >= 0)
{
// we have search string at position index
out.append(substring(s, lastindex, index)).append(with);
lastindex = index + len;
index = s.indexOf(repl, lastindex);
}
return out.append(substring(s, lastindex, len));
}
/**
* Split a string into an array of strings arround a character separator.
* This function will be efficient for longer strings
*
* @param str the string to be split
* @param separator the separator character
*
* @return array of string subparts
*/
public static String[] splitLongString(String str, char separator)
{
int len = (str == null) ? 0 : str.length();
if (str == null || len == 0)
{
return ArrayUtils.EMPTY_STRING_ARRAY;
}
int oldPos = 0;
ArrayList list = new ArrayList();
int pos = str.indexOf(separator);
while(pos >= 0)
{
list.add(substring(str, oldPos, pos));
oldPos = (pos + 1);
pos = str.indexOf(separator, oldPos);
}
list.add(substring(str, oldPos, len));
return (String[]) list.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
}
/**
* Split a string into an array of strings arround a character separator.
* Each element can be optionally quoted by the quote character.
* This function will be efficient for long strings
*
* @param str the string to be split
* @param separator the separator character
* @param quote the quote character
*
* @return array of string subparts
*
* @throws IllegalArgumentException DOCUMENT ME!
*/
public static String[] splitLongString(
String str, char separator, char quote)
{
int len = (str == null) ? 0 : str.length();
if (str == null || len == 0)
{
return ArrayUtils.EMPTY_STRING_ARRAY;
}
int oldPos = 0;
ArrayList list = new ArrayList();
for (int pos = 0; pos < len; oldPos = ++pos)
{
// Skip quoted text, if any
while ((pos < len) && (str.charAt(pos) == quote))
{
pos = str.indexOf(quote, pos + 1) + 1;
if (pos == 0)
{
throw new IllegalArgumentException(
"Closing quote missing in string '" + str + "'");
}
}
boolean quoted;
if (pos != oldPos)
{
quoted = true;
if ((pos < len) && (str.charAt(pos) != separator))
{
throw new IllegalArgumentException(
"Separator must follow closing quote in string '"
+ str + "'");
}
}
else
{
quoted = false;
pos = str.indexOf(separator, pos);
if (pos < 0)
{
pos = len;
}
}
list.add(
quoted ? dequote(str, oldPos + 1, pos - 1, quote)
: substring(str, oldPos, pos));
}
return (String[]) list.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
}
/**
* Split a string into an array of strings arround a character separator.
* This function will be efficient for short strings, for longer strings,
* another approach may be better
*
* @param str the string to be split
* @param separator the separator character
*
* @return array of string subparts
*/
public static String[] splitShortString(String str, char separator)
{
int len = (str == null) ? 0 : str.length();
if (str == null || len == 0)
{
return org.apache.myfaces.shared_tomahawk.util.ArrayUtils.EMPTY_STRING_ARRAY;
}
int lastTokenIndex = 0;
// Step 1: how many substrings?
// We exchange double scan time for less memory allocation
for (int pos = str.indexOf(separator);
pos >= 0; pos = str.indexOf(separator, pos + 1))
{
lastTokenIndex++;
}
// Step 2: allocate exact size array
String[] list = new String[lastTokenIndex + 1];
int oldPos = 0;
// Step 3: retrieve substrings
int pos = str.indexOf(separator);
int i = 0;
while (pos >= 0)
{
list[i++] = substring(str, oldPos, pos);
oldPos = (pos + 1);
pos = str.indexOf(separator, oldPos);
}
list[lastTokenIndex] = substring(str, oldPos, len);
return list;
}
/**
* Split a string into an array of strings arround a character separator.
* Each element can be optionally quoted by the quote character.
* This function will be efficient for short strings, for longer strings,
* another approach may be better
*
* @param str the string to be split
* @param separator the separator character
* @param quote the quote character
*
* @return array of string subparts
*
* @throws IllegalArgumentException DOCUMENT ME!
*/
public static String[] splitShortString(
String str, char separator, char quote)
{
int len = (str == null) ? 0 : str.length();
if (str == null || len == 0)
{
return ArrayUtils.EMPTY_STRING_ARRAY;
}
// Step 1: how many substrings?
// We exchange double scan time for less memory allocation
int tokenCount = 0;
for (int pos = 0; pos < len; pos++)
{
tokenCount++;
int oldPos = pos;
// Skip quoted text, if any
while ((pos < len) && (str.charAt(pos) == quote))
{
pos = str.indexOf(quote, pos + 1) + 1;
// pos == 0 is not found (-1 returned by indexOf + 1)
if (pos == 0)
{
throw new IllegalArgumentException(
"Closing quote missing in string '" + str + "'");
}
}
if (pos != oldPos)
{
if ((pos < len) && (str.charAt(pos) != separator))
{
throw new IllegalArgumentException(
"Separator must follow closing quote in strng '"
+ str + "'");
}
}
else
{
pos = str.indexOf(separator, pos);
if (pos < 0)
{
break;
}
}
}
// Main loop will finish one substring short when last char is separator
if (str.charAt(len - 1) == separator)
{
tokenCount++;
}
// Step 2: allocate exact size array
String[] list = new String[tokenCount];
// Step 3: retrieve substrings
// Note: on this pass we do not check for correctness,
// since we have already done so
tokenCount--; // we want to stop one token short
int oldPos = 0;
for (int pos = 0, i = 0; i < tokenCount; i++, oldPos = ++pos)
{
boolean quoted;
// Skip quoted text, if any
while (str.charAt(pos) == quote)
{
pos = str.indexOf(quote, pos + 1) + 1;
}
if (pos != oldPos)
{
quoted = true;
if (str.charAt(pos) != separator)
{
throw new IllegalArgumentException(
"Separator must follow closing quote in strng '"
+ str + "'");
}
}
else
{
quoted = false;
pos = str.indexOf(separator, pos);
}
list[i] =
quoted ? dequote(str, oldPos + 1, pos - 1, quote)
: substring(str, oldPos, pos);
}
list[tokenCount] = dequoteFull(str, oldPos, len, quote);
return list;
}
public static String substring(String str, int begin, int end)
{
if (begin == end)
{
return "";
}
return str.substring(begin, end);
}
public static String[] trim(String[] strings)
{
if (strings == null)
{
return null;
}
for (int i = 0, len = strings.length; i < len; i++)
{
strings[i] = strings[i].trim();
}
return strings;
}
/**
* Returns the minimum index >= 0, if any
*
*
* Use to find the first of two characters in a string:
* minIndex(s.indexOf('/'), indexOf('\'))
*
*
*/
public static int minIndex(int a, int b)
{
return (a < 0) ? b
: (b < 0) ? a
: (a < b) ? a : b;
}
}