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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.datatypes.PercentBase;
import org.apache.fop.fo.properties.Property;
import org.apache.fop.fo.properties.StringProperty;
/**
* Abstract Base class for XSL-FO functions
*/
public abstract class FunctionBase implements Function {
/** {@inheritDoc} */
public int getOptionalArgsCount() {
return 0;
}
/** {@inheritDoc} */
public Property getOptionalArgDefault(int index, PropertyInfo pi) throws PropertyException {
if ( index >= getOptionalArgsCount() ) {
PropertyException e = new PropertyException ( new IndexOutOfBoundsException ( "illegal optional argument index" ) );
e.setPropertyInfo ( pi );
throw e;
} else {
return null;
}
}
/** {@inheritDoc} */
public boolean hasVariableArgs() {
return false;
}
/** {@inheritDoc} */
public PercentBase getPercentBase() {
return null;
}
/**
* @param pi property information instance that applies to property being evaluated
* @return string property whose value is name of property being evaluated
*/
protected final Property getPropertyName ( PropertyInfo pi ) {
return StringProperty.getInstance ( pi.getPropertyMaker().getName() );
}
}
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