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/*
* 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.fo;
import org.apache.fop.fo.expr.PropertyException;
import org.apache.fop.fo.properties.Property;
/**
* A very fast implementation of PropertyList that uses arrays to store
* the explicit set properties and another array to store cached values.
*/
public class StaticPropertyList extends PropertyList {
private final Property[] explicit;
private final Property[] values;
/**
* Construct a StaticPropertyList.
* @param fObjToAttach The FObj object.
* @param parentPropertyList The parent property list.
*/
public StaticPropertyList(FObj fObjToAttach, PropertyList parentPropertyList) {
super(fObjToAttach, parentPropertyList);
explicit = new Property[Constants.PROPERTY_COUNT + 1];
values = new Property[Constants.PROPERTY_COUNT + 1];
}
/**
* Return the value explicitly specified on this FO.
* @param propId The ID of the property whose value is desired.
* @return The value if the property is explicitly set, otherwise null.
*/
public Property getExplicit(int propId) {
return explicit[propId];
}
/**
* Set an value defined explicitly on this FO.
* @param propId The ID of the property whose value is desired.
* @param value The value of the property to set.
*/
public void putExplicit(int propId, Property value) {
explicit[propId] = value;
if (values[propId] != null) { // if the cached value is set overwrite it
values[propId] = value;
}
}
/**
* Override PropertyList.get() and provides fast caching of previously
* retrieved property values.
* {@inheritDoc}
*/
public Property get(int propId, boolean bTryInherit, boolean bTryDefault)
throws PropertyException {
Property p = values[propId];
if (p == null) {
p = super.get(propId, bTryInherit, bTryDefault);
values[propId] = p;
}
return p;
}
}
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