| /* |
| * |
| * 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.royale.abc; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * A custom container with the following properties: |
| * <li>Ordered by entry, so iteration is in the order objects are added. |
| * <li>Optimized for reverse lookup of entry to index. |
| */ |
| public class EntryOrderedStore<T> implements Iterable<T> |
| { |
| /** |
| * This list holds the data in insertion order |
| */ |
| private final List<T> data = new ArrayList<T>(); |
| |
| /** |
| * This map enables the fast lookup: maps data records to index |
| */ |
| private final Map<T, Integer> index = new HashMap<T, Integer>(); |
| |
| @Override |
| public Iterator<T> iterator() |
| { |
| return data.iterator(); |
| } |
| |
| /** |
| * adds things |
| */ |
| public void add(T record) |
| { |
| int nextIndex = data.size(); |
| data.add(record); |
| index.put(record, nextIndex); |
| } |
| |
| /** |
| * Looks up a record, and returns the index |
| */ |
| public int getId(T record) |
| { |
| // Historic convention. Don't know if this is ever done any more |
| if (null == record) |
| return 0; |
| |
| Integer id = index.get(record); |
| if (id != null) |
| return id; |
| |
| throw new IllegalArgumentException("Unable to find record index for " + record); |
| } |
| |
| public int size() |
| { |
| assert data.size() == index.size(); |
| return data.size(); |
| } |
| } |