/* * 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; } }