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: ReferenceOrientationMaker.java 679326 2008-07-24 09:35:34Z vhennebert $ */

package org.apache.fop.fo.properties;

import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;
import org.apache.fop.fo.properties.NumberProperty.Maker;


Custom Maker adding validity check for reference-orientation

/**
 * Custom Maker adding validity check for reference-orientation
 */
public class ReferenceOrientationMaker extends Maker {

    
Constructor

Params:
  • propId – the Constant Id for the property to be made
/**
     * Constructor
     * @param propId the Constant Id for the property to be made
     */
    public ReferenceOrientationMaker(int propId) {
        super(propId);
    }

    
Check the value of the reference-orientation property.
{@inheritDoc}

/**
     * Check the value of the reference-orientation property.
     *
     * {@inheritDoc}
     */
    public Property get(int subpropId, PropertyList propertyList,
                        boolean tryInherit, boolean tryDefault)
            throws PropertyException {

        Property p = super.get(0, propertyList, tryInherit, tryDefault);
        int ro = 0;
        if (p != null) {
            ro = p.getNumeric().getValue();
        }
        if ((Math.abs(ro) % 90) == 0 && (Math.abs(ro) / 90) <= 3) {
            return p;
        } else {
            throw new PropertyException("Illegal property value: "
                    + "reference-orientation=\"" + ro + "\" "
                    + "on " + propertyList.getFObj().getName());
        }
    }

}