- /*
- * Copyright 2000-2004 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.tools.ant.util;
-
- import java.util.Hashtable;
- import java.util.Enumeration;
-
- /** Hashtable implementation that allows delayed construction
- * of expensive objects
- *
- * All operations that need access to the full list of objects
- * will call initAll() first. Get and put are cheap.
- *
- * @since Ant 1.6
- */
- public class LazyHashtable extends Hashtable {
- protected boolean initAllDone = false;
-
- public LazyHashtable() {
- super();
- }
-
- /** Used to be part of init. It must be done once - but
- * we delay it until we do need _all_ tasks. Otherwise we
- * just get the tasks that we need, and avoid costly init.
- */
- protected void initAll() {
- if (initAllDone) {
- return;
- }
- initAllDone = true;
- }
-
-
- public Enumeration elements() {
- initAll();
- return super.elements();
- }
-
- public boolean isEmpty() {
- initAll();
- return super.isEmpty();
- }
-
- public int size() {
- initAll();
- return super.size();
- }
-
- public boolean contains(Object value) {
- initAll();
- return super.contains(value);
- }
-
- public boolean containsKey(Object value) {
- initAll();
- return super.containsKey(value);
- }
-
- /**
- * Delegates to {@link #contains contains}.
- */
- public boolean containsValue(Object value) {
- return contains(value);
- }
-
- public Enumeration keys() {
- initAll();
- return super.keys();
- }
-
- // XXX Unfortunately JDK1.2 adds entrySet(), keySet(), values() -
- // implementing this requires a small hack, we can add it later.
- }