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: ValidationPercentBaseContext.java 1617052 2014-08-10 06:55:01Z gadams $ */

package org.apache.fop.datatypes;

import org.apache.fop.fo.FObj;


This base context is used during validation when the actual base values are still unknown
but should still already be checked. The actual value returned is not so important in this
case. But it's important that zero and non-zero values can be distinguished.


Example: A table with collapsing border model has no padding. The Table FO should be able
to check if non-zero values (even percentages) have been specified.

/**
 * This base context is used during validation when the actual base values are still unknown
 * but should still already be checked. The actual value returned is not so important in this
 * case. But it's important that zero and non-zero values can be distinguished.
 * <p>
 * Example: A table with collapsing border model has no padding. The Table FO should be able
 * to check if non-zero values (even percentages) have been specified.
 */
public final class ValidationPercentBaseContext implements PercentBaseContext {

    
Main constructor.

/**
     * Main constructor.
     */
    private ValidationPercentBaseContext() {
    }

    
Returns the value for the given lengthBase.
{@inheritDoc}

/**
     * Returns the value for the given lengthBase.
     * {@inheritDoc}
     */
    public int getBaseLength(int lengthBase, FObj fobj) {
        //Simply return a dummy value which produces a non-zero value when a non-zero percentage
        //was specified.
        return 100000;
    }

    private static PercentBaseContext pseudoContextForValidation = new ValidationPercentBaseContext();

    
Returns:a base context for validation purposes. See class description.
/** @return a base context for validation purposes. See class description. */
    public static PercentBaseContext getPseudoContext() {
        return pseudoContextForValidation;
    }

}