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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.properties;
import org.apache.fop.datatypes.Length;
import org.apache.fop.datatypes.Numeric;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;
/**
* Superclass for properties wrapping a Length value.
*/
abstract public class LengthProperty extends Property
implements Length, Numeric
{
/**
* Inner class for making instances of LengthProperty
*/
public static class Maker extends PropertyMaker {
private boolean autoOk = false;
/**
* @param propId the id of the property for which a Maker should be created
*/
public Maker(int propId) {
super(propId);
}
/**
* @see PropertyMaker#convertProperty
*/
public Property convertProperty(Property p,
PropertyList propertyList,
FObj fo) throws PropertyException {
Property prop = super.convertProperty(p, propertyList, fo);
if (prop != null) {
return prop;
}
if (p instanceof EnumProperty) {
return new EnumLength(p);
}
if (p instanceof LengthProperty) {
return p;
}
Length val = p.getLength();
if (val != null) {
return (Property) val;
}
return convertPropertyDatatype(p, propertyList, fo);
}
}
/**
* Return the number of table units which are included in this
* length specification.
* This will always be 0 unless the property specification used
* the proportional-column-width() function (only only table
* column FOs).
* <p>If this value is not 0, the actual value of the Length cannot
* be known without looking at all of the columns in the table to
* determine the value of a "table-unit".
* @return The number of table units which are included in this
* length specification.
*/
public double getTableUnits() {
return 0.0;
}
/**
* Return the numeric dimension. Length always a dimension of 1.
*/
public int getDimension() {
return 1;
}
/**
* @return this.length cast as a Numeric
*/
public Numeric getNumeric() {
return this;
}
/**
* @return this.length
*/
public Length getLength() {
return this;
}
/**
* @return this.length cast as an Object
*/
public Object getObject() {
return this;
}
}
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