| /* |
| * 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. |
| */ |
| 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. |
| * @param propId The property ID |
| */ |
| public Property get(int propId, boolean bTryInherit, boolean bTryDefault) |
| throws PropertyException |
| { |
| Property p = values[propId]; |
| if (p == null) { |
| p = values[propId] = super.get(propId, bTryInherit, bTryDefault); |
| } |
| return p; |
| } |
| } |