impl.com.sun.xml.bind.WhiteSpaceProcessor Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of ehcache Show documentation
Show all versions of ehcache Show documentation
Ehcache is an open source, standards-based cache used to boost performance,
offload the database and simplify scalability. Ehcache is robust, proven and full-featured and
this has made it the most widely-used Java-based cache.
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 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.
*/
package com.sun.xml.bind;
/**
* Processes white space normalization.
*
* @since 1.0
*/
public abstract class WhiteSpaceProcessor {
// benchmarking (see test/src/ReplaceTest.java in the CVS Attic)
// showed that this code is slower than the current code.
//
// public static String replace(String text) {
// final int len = text.length();
// StringBuffer result = new StringBuffer(len);
//
// for (int i = 0; i < len; i++) {
// char ch = text.charAt(i);
// if (isWhiteSpace(ch))
// result.append(' ');
// else
// result.append(ch);
// }
//
// return result.toString();
// }
public static String replace(String text) {
return replace( (CharSequence)text ).toString();
}
/**
* @since 2.0
*/
public static CharSequence replace(CharSequence text) {
int i=text.length()-1;
// look for the first whitespace char.
while( i>=0 && !isWhiteSpaceExceptSpace(text.charAt(i)) )
i--;
if( i<0 )
// no such whitespace. replace(text)==text.
return text;
// we now know that we need to modify the text.
// allocate a char array to do it.
StringBuilder buf = new StringBuilder(text);
buf.setCharAt(i--,' ');
for( ; i>=0; i-- )
if( isWhiteSpaceExceptSpace(buf.charAt(i)))
buf.setCharAt(i,' ');
return new String(buf);
}
/**
* Equivalent of {@link String#trim()}.
* @since 2.0
*/
public static CharSequence trim(CharSequence text) {
int len = text.length();
int start = 0;
while( startstart && isWhiteSpace(text.charAt(end)) )
end--;
if(start==0 && end==len-1)
return text; // no change
else
return text.subSequence(start,end+1);
}
public static String collapse(String text) {
return collapse( (CharSequence)text ).toString();
}
/**
* This is usually the biggest processing bottleneck.
*
* @since 2.0
*/
public static CharSequence collapse(CharSequence text) {
int len = text.length();
// most of the texts are already in the collapsed form.
// so look for the first whitespace in the hope that we will
// never see it.
int s=0;
while(s 0 && result.charAt(len - 1) == ' ')
result.setLength(len - 1);
// whitespaces are already collapsed,
// so all we have to do is to remove the last one character
// if it's a whitespace.
return result;
}
/**
* Returns true if the specified string is all whitespace.
*/
public static final boolean isWhiteSpace(CharSequence s) {
for( int i=s.length()-1; i>=0; i-- )
if(!isWhiteSpace(s.charAt(i)))
return false;
return true;
}
/** returns true if the specified char is a white space character. */
public static final boolean isWhiteSpace(char ch) {
// most of the characters are non-control characters.
// so check that first to quickly return false for most of the cases.
if( ch>0x20 ) return false;
// other than we have to do four comparisons.
return ch == 0x9 || ch == 0xA || ch == 0xD || ch == 0x20;
}
/**
* Returns true if the specified char is a white space character
* but not 0x20.
*/
protected static final boolean isWhiteSpaceExceptSpace(char ch) {
// most of the characters are non-control characters.
// so check that first to quickly return false for most of the cases.
if( ch>=0x20 ) return false;
// other than we have to do four comparisons.
return ch == 0x9 || ch == 0xA || ch == 0xD;
}
}