/*
* 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.datatypes;
import org.apache.fop.fo.expr.PropertyException;
/**
* Interface for objects that can be used as base objects for percentage
* computations
*/
public interface PercentBase {
/**
* Determines whether a numeric property is created or one with a percentage
* base.
* @return 0 for length, 1 for percentage
*/
int getDimension();
/**
* @return the base value (this will be used as the base to which a percentage will be
* applied to compute the length of the referencing item)
*/
double getBaseValue();
/**
* @param context The context for percentage evaluation
* @return the integer size in millipoints of the object (this will be used
* as the base to which a percentage will be applied to compute the length
* of the referencing item)
* @throws PropertyException if a problem occurs during evaluation of this
* value.
*/
int getBaseLength(PercentBaseContext context) throws PropertyException;
}