org.xmlpull.infoset.xpath.jaxen.function.TranslateFunction Maven / Gradle / Ivy
/*
* $Header: /l/extreme/cvs/codes/xpp5/xis5/infoset_xpath_jaxen/org/xmlpull/infoset/xpath/jaxen/function/TranslateFunction.java,v 1.1 2005/05/16 23:59:24 aslom Exp $
* $Revision: 1.1 $
* $Date: 2005/05/16 23:59:24 $
*
* ====================================================================
*
* Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions, and the disclaimer that follows
* these conditions in the documentation and/or other materials
* provided with the distribution.
*
* 3. The name "Jaxen" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact [email protected].
*
* 4. Products derived from this software may not be called "Jaxen", nor
* may "Jaxen" appear in their name, without prior written permission
* from the Jaxen Project Management ([email protected]).
*
* In addition, we request (but do not require) that you include in the
* end-user documentation provided with the redistribution and/or in the
* software itself an acknowledgement equivalent to the following:
* "This product includes software developed by the
* Jaxen Project (http://www.jaxen.org/)."
* Alternatively, the acknowledgment may be graphical using the logos
* available at http://www.jaxen.org/
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* ====================================================================
* This software consists of voluntary contributions made by many
* individuals on behalf of the Jaxen Project and was originally
* created by bob mcwhirter and
* James Strachan . For more information on the
* Jaxen Project, please see 4.2 string translate(string,string,string)
*
* The translation is done thru a HashMap.
* Performance tip (for anyone who needs to improve the performance of this particular function):
* Cache the HashMaps, once they are constructed.
*
* @author Jan Dvorak ( jan.dvorak @ mathan.cz )
*
*/
public class TranslateFunction implements Function
{
public Object call(Context context,
List args) throws FunctionCallException
{
if (args.size() == 3)
{
return evaluate( args.get(0),
args.get(1),
args.get(2),
context.getNavigator() );
}
throw new FunctionCallException( "translate() requires three arguments." );
}
public static String evaluate(Object strArg,
Object fromArg,
Object toArg,
Navigator nav)
{
String inStr = StringFunction.evaluate( strArg, nav );
String fromStr = StringFunction.evaluate( fromArg, nav );
String toStr = StringFunction.evaluate( toArg, nav );
// Initialize the mapping in a HashMap
Map charMap = new HashMap();
int fromLen = fromStr.length();
int toLen = toStr.length();
for ( int i = 0; i < fromLen; ++i ) {
String cFrom = fromStr.substring( i, i+1 ).intern();
if ( charMap.containsKey( cFrom ) ) {
// We've seen the character before, ignore
continue;
}
if ( i < toLen ) {
Character cTo = new Character( toStr.charAt( i ) );
// Will change
charMap.put( cFrom, cTo );
} else {
// Will delete
charMap.put( cFrom, null );
}
}
// Process the input string thru the map
StringBuffer outStr = new StringBuffer( inStr.length() );
int inLen = inStr.length();
for ( int i = 0; i < inLen; ++i ) {
String cIn = inStr.substring( i, i+1 );
if ( charMap.containsKey( cIn ) ) {
Character cTo = (Character) charMap.get( cIn );
if ( cTo != null ) {
outStr.append( cTo.charValue() );
}
} else {
outStr.append( cIn );
}
}
return new String( outStr );
}
}