/*
* 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: BodyStartFunction.java 426576 2006-07-28 15:44:37Z jeremias $ */
package org.apache.fop.fo.expr;
import org.apache.fop.datatypes.Numeric;
import org.apache.fop.fo.Constants;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.flow.ListItem;
import org.apache.fop.fo.properties.Property;
/**
* Class corresponding to the body-start Property Value function. See Sec.
* 5.10.4 of the XSL-FO spec.
*/
public class BodyStartFunction extends FunctionBase {
/**
* @return 0 (there are no arguments for body-start)
*/
public int nbArgs() {
return 0;
}
/**
* @param args array of arguments (none are used, but this is required by
* the Function interface)
* @param pInfo PropertyInfo object to be evaluated
* @return numeric object containing the calculated body-start value
* @throws PropertyException if called from outside of an fo:list-item
*/
public Property eval(Property[] args,
PropertyInfo pInfo) throws PropertyException {
Numeric distance =
pInfo.getPropertyList().get(Constants.PR_PROVISIONAL_DISTANCE_BETWEEN_STARTS).getNumeric();
PropertyList pList = pInfo.getPropertyList();
while (pList != null && !(pList.getFObj() instanceof ListItem)) {
pList = pList.getParentPropertyList();
}
if (pList == null) {
throw new PropertyException("body-start() called from outside an fo:list-item");
}
Numeric startIndent = pList.get(Constants.PR_START_INDENT).getNumeric();
return (Property) NumericOp.addition(distance, startIndent);
}
}