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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.fo.expr;
import org.apache.fop.fo.FOPropertyMapping;
import org.apache.fop.fo.properties.Property;
/**
* 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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