org.xmlpull.infoset.xpath.jaxen.function.StringFunction Maven / Gradle / Ivy
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/*
* $Header: /l/extreme/cvs/codes/xpp5/xis5/infoset_xpath_jaxen/org/xmlpull/infoset/xpath/jaxen/function/StringFunction.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 string(object)
*
* @author bob mcwhirter (bob @ werken.com)
*/
public class StringFunction implements Function
{
public Object call(Context context,
List args) throws FunctionCallException
{
int size = args.size();
if ( size == 0 )
{
return evaluate( context.getNodeSet(),
context.getNavigator() );
}
else if ( size == 1 )
{
return evaluate( args.get(0),
context.getNavigator() );
}
throw new FunctionCallException( "string() requires one argument." );
}
public static String evaluate(Object obj,
Navigator nav)
{
if ( obj == null )
{
return "";
}
if ( obj instanceof String)
{
return (String) obj;
}
else if ( nav.isElement( obj ) )
{
return nav.getElementStringValue( obj );
}
else if ( nav.isAttribute( obj ) )
{
return nav.getAttributeStringValue( obj );
}
else if ( nav.isText( obj ) )
{
return nav.getTextStringValue( obj );
}
else if ( nav.isProcessingInstruction( obj ) )
{
return nav.getProcessingInstructionData( obj );
}
else if ( nav.isComment( obj ) )
{
return nav.getCommentStringValue( obj );
}
else if ( nav.isNamespace( obj ) )
{
return nav.getNamespaceStringValue( obj );
}
else if (obj instanceof List)
{
List list = (List) obj;
int size = list.size();
if ( size > 0 ) {
// the XPath string() function only returns the
// string value of the first node in a nodeset
return evaluate( list.get(0),
nav );
}
}
else if ( obj instanceof Boolean )
{
return obj.toString();
}
else if ( obj instanceof Integer )
{
return obj.toString();
}
else if ( obj instanceof Double )
{
Double num = (Double) obj;
if ( num.isNaN() )
{
return "NaN";
}
else if ( num.isInfinite() )
{
if ( num.intValue() < 0 )
{
return "-Infinity";
}
else
{
return "Infinity";
}
}
else if( num.floatValue() == num.intValue() ) // strip .0
{
return Integer.toString( num.intValue() );
}
else
{
return num.toString();
}
}
return "";
}
}