http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * 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: BoxPropShorthandParser.java 679326 2008-07-24 09:35:34Z vhennebert $ */

package org.apache.fop.fo.properties;

import org.apache.fop.fo.FOPropertyMapping;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;


Shorthand property parser for Box properties

/**
 * Shorthand property parser for Box properties
 */
public class BoxPropShorthandParser extends GenericShorthandParser {

    
Default constructor.

/**
     * Default constructor.
     */
    public BoxPropShorthandParser() {
    }

    
Stores 1 to 4 values of same type.
Set the given property based on the number of values set.
Example: padding, border-width, border-color, border-style, margin
{@inheritDoc}
int, Property, PropertyMaker, PropertyList)

/**
     * Stores 1 to 4 values of same type.
     * Set the given property based on the number of values set.
     * Example: padding, border-width, border-color, border-style, margin
     * {@inheritDoc}
     * int, Property, PropertyMaker, PropertyList)
     */
    protected Property convertValueForProperty(int propId,
                                               Property property,
                                               PropertyMaker maker,
                                               PropertyList propertyList)
                throws PropertyException {
        String name = FOPropertyMapping.getPropertyName(propId);
        Property p = null;
        int count = property.getList().size();
        if (name.indexOf("-top") >= 0) {
            p = getElement(property, 0);
        } else if (name.indexOf("-right") >= 0) {
            p = getElement(property, count > 1 ? 1 : 0);
        } else if (name.indexOf("-bottom") >= 0) {
            p = getElement(property, count > 2 ? 2 : 0);
        } else if (name.indexOf("-left") >= 0) {
            p = getElement(property, count > 3 ? 3 : (count > 1 ? 1 : 0));
        }
        // if p not null, try to convert it to a value of the correct type
        if (p != null) {
            return maker.convertShorthandProperty(propertyList, p, null);
        }
        return p;
    }

}