| /* |
| * Copyright (c) OSGi Alliance (2017). All Rights Reserved. |
| * |
| * 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.osgi.util.converter; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Dictionary; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * @author $Id$ |
| */ |
| class MapDelegate<K, V> implements Map<K,V> { |
| // not synchronized. Worst that can happen is that cloning is done more than |
| // once, which is harmless. |
| private volatile boolean cloned = false; |
| private final ConvertingImpl convertingImpl; |
| Map<K,V> delegate; |
| |
| private MapDelegate(ConvertingImpl converting, Map<K,V> del) { |
| convertingImpl = converting; |
| delegate = del; |
| } |
| |
| static MapDelegate<String,Object> forBean(Object b, Class< ? > beanClass, |
| ConvertingImpl converting) { |
| return new MapDelegate<>(converting, |
| new DynamicBeanFacade(b, beanClass, converting)); |
| } |
| |
| static <K, V> Map<K,V> forMap(Map<K,V> m, ConvertingImpl converting) { |
| return new MapDelegate<>(converting, |
| new DynamicMapFacade<>(m, converting)); |
| } |
| |
| static <K, V> MapDelegate<K,V> forDictionary(Dictionary<K,V> d, |
| ConvertingImpl converting) { |
| return new MapDelegate<>(converting, |
| new DynamicDictionaryFacade<>(d, converting)); |
| } |
| |
| static MapDelegate<String,Object> forDTO(Object obj, Class< ? > dtoClass, |
| ConvertingImpl converting) { |
| return new MapDelegate<>(converting, |
| new DynamicDTOFacade(obj, dtoClass, converting)); |
| } |
| |
| static MapDelegate<String,Object> forInterface(Object obj, Class< ? > intf, |
| ConvertingImpl converting) { |
| return new MapDelegate<>(converting, |
| new DynamicInterfaceFacade(obj, intf, converting)); |
| } |
| |
| @Override |
| public int size() { |
| // Need to convert the entire map to get the size |
| Set<Object> keys = new HashSet<>(); |
| |
| Set<K> ks = delegate.keySet(); |
| for (K key : ks) { |
| keys.add(getConvertedKey(key)); |
| } |
| |
| return keys.size(); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return delegate.isEmpty(); |
| } |
| |
| @Override |
| public boolean containsKey(Object key) { |
| return keySet().contains(key); |
| } |
| |
| @Override |
| public boolean containsValue(Object value) { |
| return values().contains(value); |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public V get(Object key) { |
| V val = null; |
| if (internalKeySet().contains(key)) { |
| val = delegate.get(key); |
| } |
| |
| if (val == null) { |
| key = findConvertedKey(internalKeySet(), key); |
| val = delegate.get(key); |
| } |
| |
| if (val == null) |
| return null; |
| else |
| return (V) getConvertedValue(val); |
| } |
| |
| private Object getConvertedKey(Object key) { |
| return convertingImpl.convertMapKey(key); |
| } |
| |
| private Object getConvertedValue(Object val) { |
| return convertingImpl.convertMapValue(val); |
| } |
| |
| private Object findConvertedKey(Set< ? > keySet, Object key) { |
| for (Object k : keySet) { |
| if (key.equals(k)) |
| return k; |
| } |
| |
| for (Object k : keySet) { |
| Object c = convertingImpl.converter.convert(k).to(key.getClass()); |
| if (c != null && c.equals(key)) |
| return k; |
| } |
| return key; |
| } |
| |
| @Override |
| public V put(K key, V value) { |
| cloneDelegate(); |
| |
| return delegate.put(key, value); |
| } |
| |
| @Override |
| public V remove(Object key) { |
| cloneDelegate(); |
| |
| return delegate.remove(key); |
| } |
| |
| @Override |
| public void putAll(Map< ? extends K, ? extends V> m) { |
| cloneDelegate(); |
| |
| delegate.putAll(m); |
| } |
| |
| @Override |
| public void clear() { |
| cloned = true; |
| delegate = new HashMap<>(); |
| } |
| |
| private Set<K> internalKeySet() { |
| return delegate.keySet(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public Set<K> keySet() { |
| Set<K> keys = new HashSet<>(); |
| for (Object key : internalKeySet()) { |
| keys.add((K) getConvertedKey(key)); |
| } |
| return keys; |
| } |
| |
| @Override |
| public Collection<V> values() { |
| List<V> values = new ArrayList<>(); |
| for (Map.Entry<K,V> entry : entrySet()) { |
| values.add(entry.getValue()); |
| } |
| return values; |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public Set<java.util.Map.Entry<K,V>> entrySet() { |
| Set<Map.Entry<K,V>> result = new HashSet<>(); |
| for (Map.Entry< ? , ? > entry : delegate.entrySet()) { |
| K key = (K) findConvertedKey(internalKeySet(), entry.getKey()); |
| V val = (V) getConvertedValue(entry.getValue()); |
| result.add(new MapEntry<K,V>(key, val)); |
| } |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| return delegate.equals(o); |
| } |
| |
| @Override |
| public int hashCode() { |
| return delegate.hashCode(); |
| } |
| |
| private void cloneDelegate() { |
| if (cloned) { |
| return; |
| } else { |
| cloned = true; |
| delegate = new HashMap<>(delegate); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return delegate.toString(); |
| } |
| |
| static class MapEntry<K, V> implements Map.Entry<K,V> { |
| private final K key; |
| private final V value; |
| |
| MapEntry(K k, V v) { |
| key = k; |
| value = v; |
| } |
| |
| @Override |
| public K getKey() { |
| return key; |
| } |
| |
| @Override |
| public V getValue() { |
| return value; |
| } |
| |
| @Override |
| public V setValue(V value) { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| } |