| /* |
| * $Id$ |
| * |
| * 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.tiles.request.collection; |
| |
| import static org.apache.tiles.request.collection.CollectionUtil.*; |
| |
| import java.util.Collection; |
| import java.util.Enumeration; |
| import java.util.Iterator; |
| import java.util.LinkedHashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.tiles.request.attribute.AttributeExtractor; |
| |
| /** |
| * Exposes a scope context as a <String, Object> map. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| |
| public class ScopeMap extends ReadOnlyEnumerationMap<Object> { |
| |
| /** |
| * The context to read. |
| */ |
| private AttributeExtractor context; |
| |
| /** |
| * Constructor. |
| * |
| * @param context The servlet context to use. |
| */ |
| public ScopeMap(AttributeExtractor context) { |
| super(context); |
| this.context = context; |
| } |
| |
| |
| /** {@inheritDoc} */ |
| public void clear() { |
| Enumeration<String> keys = context.getKeys(); |
| while (keys.hasMoreElements()) { |
| context.removeValue(keys.nextElement()); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| public Set<Map.Entry<String, Object>> entrySet() { |
| return new ScopeEntrySet(); |
| } |
| |
| /** {@inheritDoc} */ |
| public Set<String> keySet() { |
| return new RemovableKeySet(context); |
| } |
| |
| /** {@inheritDoc} */ |
| public Object put(String key, Object value) { |
| String skey = key(key); |
| Object previous = context.getValue(skey); |
| context.setValue(skey, value); |
| return previous; |
| } |
| |
| /** {@inheritDoc} */ |
| public void putAll(Map<? extends String, ? extends Object> map) { |
| Iterator<? extends String> keys = map.keySet().iterator(); |
| while (keys.hasNext()) { |
| String key = keys.next(); |
| context.setValue(key, map.get(key)); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| public Object remove(Object key) { |
| String skey = key(key); |
| Object previous = context.getValue(skey); |
| context.removeValue(skey); |
| return (previous); |
| } |
| |
| /** |
| * Entry set implementation for {@link ScopeMap}. |
| */ |
| private class ScopeEntrySet extends ReadOnlyEnumerationMap<Object>.ReadOnlyEnumerationMapEntrySet { |
| |
| @Override |
| public boolean add(java.util.Map.Entry<String, Object> e) { |
| String key = e.getKey(); |
| Object value = e.getValue(); |
| Object oldValue = get(key); |
| if (oldValue == null || !oldValue.equals(value)) { |
| context.setValue(key, value); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean addAll( |
| Collection<? extends java.util.Map.Entry<String, Object>> c) { |
| boolean retValue = false; |
| for (Map.Entry<String, Object> entry : c) { |
| retValue |= add(entry); |
| } |
| return retValue; |
| } |
| |
| @Override |
| public void clear() { |
| ScopeMap.this.clear(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public boolean remove(Object o) { |
| Map.Entry<String, Object> entry = (java.util.Map.Entry<String, Object>) o; |
| String key = entry.getKey(); |
| Object currentValue = context.getValue(key); |
| if (currentValue != null && currentValue.equals(entry.getValue())) { |
| context.removeValue(key); |
| return true; |
| } |
| return false; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public boolean removeAll(Collection<?> c) { |
| Collection<Map.Entry<String, Object>> realCollection = (Collection<java.util.Map.Entry<String, Object>>) c; |
| boolean retValue = false; |
| for (Map.Entry<String, Object> entry : realCollection) { |
| retValue |= remove(entry); |
| } |
| return retValue; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public boolean retainAll(Collection<?> c) { |
| Collection<Map.Entry<String, Object>> realCollection = (Collection<java.util.Map.Entry<String, Object>>) c; |
| boolean retValue = false; |
| Set<String> keysToRemove = new LinkedHashSet<String>(); |
| for (Enumeration<String> keys = context.getKeys(); keys.hasMoreElements();) { |
| String key = keys.nextElement(); |
| Object value = context.getValue(key); |
| Map.Entry<String, Object> entry = new MapEntry<String, Object>(key, value, false); |
| if (!realCollection.contains(entry)) { |
| retValue = true; |
| keysToRemove.add(key); |
| } |
| } |
| for (String key : keysToRemove) { |
| context.removeValue(key); |
| } |
| return retValue; |
| } |
| } |
| } |