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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.datatypes.PercentBaseContext;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.flow.table.Table;
import org.apache.fop.fo.properties.Property;
import org.apache.fop.fo.properties.TableColLength;
/**
* Class modelling the proportional-column-width function. See Sec. 5.10.4 of
* the XSL-FO standard.
*/
public class PPColWidthFunction extends FunctionBase {
/**
* @return 1 (the number of arguments for the proportional-column-width
* function)
*/
public int nbArgs() {
return 1;
}
/**
* @return the {@link PercentBase} for the proportional-column-width()
* function
*/
public PercentBase getPercentBase() {
return new PPColWidthPercentBase();
}
/**
*
* @param args array of arguments for this function
* @param pInfo PropertyInfo for this function
* @return numeric Property containing the units of proportional measure
* for this column
* @throws PropertyException for non-numeric operand, or if the parent
* element is not a table-column
*/
public Property eval(Property[] args,
PropertyInfo pInfo) throws PropertyException {
Number d = args[0].getNumber();
if (d == null) {
throw new PropertyException("Non numeric operand to "
+ "proportional-column-width() function.");
}
PropertyList pList = pInfo.getPropertyList();
if (!"fo:table-column".equals(pList.getFObj().getName())) {
throw new PropertyException("proportional-column-width() function "
+ "may only be used on fo:table-column.");
}
Table t = (Table) pList.getParentFObj();
if (t.isAutoLayout()) {
throw new PropertyException("proportional-column-width() function "
+ "may only be used when fo:table has "
+ "table-layout=\"fixed\".");
}
return new TableColLength(d.doubleValue(), pInfo.getFO());
}
private static class PPColWidthPercentBase implements PercentBase {
/** {@inheritDoc} */
public int getBaseLength(PercentBaseContext context) throws PropertyException {
return 0;
}
/** {@inheritDoc} */
public double getBaseValue() {
//make sure percentage-arguments are interpreted
//as numerics (1% = 1 * 0.01)
return 1;
}
/** {@inheritDoc} */
public int getDimension() {
return 0;
}
}
}
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