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/*
* $Id: FromParentFunction.java,v 1.3 2003/03/05 21:59:47 jeremias Exp $
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, 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 following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* 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
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, 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 Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.fo.expr;
import org.apache.fop.fo.Property;
import org.apache.fop.fo.FOPropertyMapping;
/**
* Class modelling the from-parent Property Value function. See Sec. 5.10.4 of
* the XSL-FO spec.
*/
public class FromParentFunction extends FunctionBase {
/**
* @return 1 (maximum arguments for the from-parent function)
*/
public int nbArgs() {
return 1;
}
/**
* @param args array of arguments, which should either be empty, or the
* first of which should contain an NCName corresponding to property name
* @param pInfo PropertyInfo object to be evaluated
* @return property containing the computed value
* @throws PropertyException if the arguments are incorrect
*/
public Property eval(Property[] args,
PropertyInfo pInfo) throws PropertyException {
String propName = args[0].getString();
if (propName == null) {
throw new PropertyException("Incorrect parameter to from-parent function");
}
// NOTE: special cases for shorthand property
// Should return COMPUTED VALUE
/*
* For now, this is the same as inherited-property-value(propName)
* (The only difference I can see is that this could work for
* non-inherited properties too. Perhaps the result is different for
* a property line line-height which "inherits specified"???
*/
return pInfo.getPropertyList().getFromParent(FOPropertyMapping.getPropertyId(propName));
}
}
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