/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.
*/
/*
* $Id: FuncTranslate.java,v 1.2.4.1 2005/09/14 20:18:45 jeffsuttor Exp $
*/
package com.sun.org.apache.xpath.internal.functions;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.objects.XObject;
import com.sun.org.apache.xpath.internal.objects.XString;
/**
* Execute the Translate() function.
* @xsl.usage advanced
*/
public class FuncTranslate extends Function3Args
{
static final long serialVersionUID = -1672834340026116482L;
/**
* Execute the function. The function must return
* a valid object.
* @param xctxt The current execution context.
* @return A valid XObject.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{
String theFirstString = m_arg0.execute(xctxt).str();
String theSecondString = m_arg1.execute(xctxt).str();
String theThirdString = m_arg2.execute(xctxt).str();
int theFirstStringLength = theFirstString.length();
int theThirdStringLength = theThirdString.length();
// A vector to contain the new characters. We'll use it to construct
// the result string.
StringBuffer sbuffer = new StringBuffer();
for (int i = 0; i < theFirstStringLength; i++)
{
char theCurrentChar = theFirstString.charAt(i);
int theIndex = theSecondString.indexOf(theCurrentChar);
if (theIndex < 0)
{
// Didn't find the character in the second string, so it
// is not translated.
sbuffer.append(theCurrentChar);
}
else if (theIndex < theThirdStringLength)
{
// OK, there's a corresponding character in the
// third string, so do the translation...
sbuffer.append(theThirdString.charAt(theIndex));
}
else
{
// There's no corresponding character in the
// third string, since it's shorter than the
// second string. In this case, the character
// is removed from the output string, so don't
// do anything.
}
}
return new XString(sbuffer.toString());
}
}