Initial version.

PR: 31699

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@198062 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/src/java/org/apache/fop/fo/StaticPropertyList.java b/src/java/org/apache/fop/fo/StaticPropertyList.java
new file mode 100755 (executable)
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+++ b/src/java/org/apache/fop/fo/StaticPropertyList.java
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+/*
+ * Copyright 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.
+ */
+package org.apache.fop.fo;
+
+import org.apache.fop.fo.properties.Property;
+
+/**
+ * A very fast implementation of PropertyList that uses arrays to store
+ * the explit set properties and another array to store cached values.
+ */
+public class StaticPropertyList extends PropertyList {
+       private Property[] explicit;
+       private 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;
+    }
+
+    /**
+     * 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) {
+        Property p = values[propId];
+        if (p == null) {
+            p = values[propId] = super.get(propId, bTryInherit, bTryDefault);
+        }
+        return p;
+    }
+}