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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.datatypes.Numeric;
import org.apache.fop.fo.Constants;
import org.apache.fop.fo.FONode;
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();
FONode item = pInfo.getFO();
while (item != null && !(item instanceof ListItem)) {
item = item.getParent();
}
if (item == null) {
throw new PropertyException("body-start() called from outside an fo:list-item");
}
Numeric startIndent =
((ListItem)item).propertyList.get(Constants.PR_START_INDENT).getNumeric();
return (Property) NumericOp.addition(distance, startIndent);
}
}
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