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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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-nearest-specified-value function. See Sec. 5.10.4
* of the XSL-FO standard.
*/
public class FromNearestSpecifiedValueFunction extends FunctionBase {
/** {@inheritDoc} */
public int getRequiredArgsCount() {
return 0;
}
@Override
/** {@inheritDoc} */
public int getOptionalArgsCount() {
return 1;
}
@Override
/** {@inheritDoc} */
public Property getOptionalArgDefault(int index, PropertyInfo pi) throws PropertyException {
if (index == 0) {
return getPropertyName(pi);
} else {
return super.getOptionalArgDefault(index, pi);
}
}
/** {@inheritDoc} */
public Property eval(Property[] args, PropertyInfo pInfo) throws PropertyException {
String propName = args[0].getString();
if (propName == null) {
throw new PropertyException(
"Incorrect parameter to from-nearest-specified-value function");
}
// NOTE: special cases for shorthand property
// Should return COMPUTED VALUE
int propId = FOPropertyMapping.getPropertyId(propName);
if (propId < 0) {
throw new PropertyException(
"Unknown property name used with inherited-property-value function: "
+ propName);
}
return pInfo.getPropertyList().getNearestSpecified(propId);
}
}
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