| /* |
| * 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.lang.reflect.Field; |
| import java.lang.reflect.Method; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Dictionary; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * @author $Id$ |
| */ |
| abstract class DynamicMapLikeFacade<K, V> implements Map<K,V> { |
| protected final ConvertingImpl convertingImpl; |
| |
| protected DynamicMapLikeFacade(ConvertingImpl convertingImpl) { |
| this.convertingImpl = convertingImpl; |
| } |
| |
| @Override |
| public int size() { |
| return keySet().size(); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return size() == 0; |
| } |
| |
| @Override |
| public boolean containsKey(Object key) { |
| return keySet().contains(key); |
| } |
| |
| @Override |
| public boolean containsValue(Object value) { |
| for (Entry<K,V> entry : entrySet()) { |
| if (value == null) { |
| if (entry.getValue() == null) { |
| return true; |
| } |
| } else if (value.equals(entry.getValue())) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public V put(K key, V value) { |
| // Should never be called; the delegate should swap to a copy in this |
| // case |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public V remove(Object key) { |
| // Should never be called; the delegate should swap to a copy in this |
| // case |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void putAll(Map< ? extends K, ? extends V> m) { |
| // Should never be called; the delegate should swap to a copy in this |
| // case |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void clear() { |
| // Should never be called; the delegate should swap to a copy in this |
| // case |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public Collection<V> values() { |
| List<V> res = new ArrayList<>(); |
| |
| for (Map.Entry<K,V> entry : entrySet()) { |
| res.add(entry.getValue()); |
| } |
| return res; |
| } |
| |
| @Override |
| public Set<Entry<K,V>> entrySet() { |
| Set<K> ks = keySet(); |
| |
| Set<Entry<K,V>> res = new LinkedHashSet<>(ks.size()); |
| |
| for (K k : ks) { |
| V v = get(k); |
| res.add(new MapDelegate.MapEntry<K,V>(k, v)); |
| } |
| return res; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| |
| sb.append('{'); |
| boolean first = true; |
| for (Map.Entry<K,V> entry : entrySet()) { |
| if (first) |
| first = false; |
| else |
| sb.append(", "); |
| |
| sb.append(entry.getKey()); |
| sb.append('='); |
| sb.append(entry.getValue()); |
| } |
| sb.append('}'); |
| |
| return sb.toString(); |
| } |
| } |
| |
| class DynamicBeanFacade extends DynamicMapLikeFacade<String,Object> { |
| private Map<String,Method> keys = null; |
| private final Object backingObject; |
| private final Class< ? > beanClass; |
| |
| DynamicBeanFacade(Object backingObject, Class< ? > beanClass, |
| ConvertingImpl convertingImpl) { |
| super(convertingImpl); |
| this.backingObject = backingObject; |
| this.beanClass = beanClass; |
| } |
| |
| @Override |
| public Object get(Object key) { |
| Method m = getKeys().get(key); |
| try { |
| return m.invoke(backingObject); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Override |
| public Set<String> keySet() { |
| return getKeys().keySet(); |
| } |
| |
| private Map<String,Method> getKeys() { |
| if (keys == null) |
| keys = Util.getBeanKeys(beanClass); |
| |
| return keys; |
| } |
| } |
| |
| class DynamicDictionaryFacade<K, V> extends DynamicMapLikeFacade<K,V> { |
| private final Dictionary<K,V> backingObject; |
| |
| DynamicDictionaryFacade(Dictionary<K,V> backingObject, |
| ConvertingImpl convertingImpl) { |
| super(convertingImpl); |
| this.backingObject = backingObject; |
| } |
| |
| @Override |
| public V get(Object key) { |
| return backingObject.get(key); |
| } |
| |
| @Override |
| public Set<K> keySet() { |
| return new HashSet<>(Collections.list(backingObject.keys())); |
| } |
| } |
| |
| class DynamicMapFacade<K, V> extends DynamicMapLikeFacade<K,V> { |
| private final Map<K,V> backingObject; |
| |
| DynamicMapFacade(Map<K,V> backingObject, ConvertingImpl convertingImpl) { |
| super(convertingImpl); |
| this.backingObject = backingObject; |
| } |
| |
| @Override |
| public V get(Object key) { |
| return backingObject.get(key); |
| } |
| |
| @Override |
| public Set<K> keySet() { |
| Map<K,V> m = backingObject; |
| return m.keySet(); |
| } |
| } |
| |
| class DynamicDTOFacade extends DynamicMapLikeFacade<String,Object> { |
| private Map<String,Field> keys = null; |
| private final Object backingObject; |
| private final Class< ? > dtoClass; |
| |
| DynamicDTOFacade(Object backingObject, Class< ? > dtoClass, |
| ConvertingImpl converting) { |
| super(converting); |
| this.backingObject = backingObject; |
| this.dtoClass = dtoClass; |
| } |
| |
| @Override |
| public Object get(Object key) { |
| Field f = getKeys().get(key); |
| if (f == null) |
| return null; |
| |
| try { |
| return f.get(backingObject); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Override |
| public Set<String> keySet() { |
| return getKeys().keySet(); |
| } |
| |
| private Map<String,Field> getKeys() { |
| if (keys == null) |
| keys = Util.getDTOKeys(dtoClass); |
| |
| return keys; |
| } |
| } |
| |
| class DynamicInterfaceFacade extends DynamicMapLikeFacade<String,Object> { |
| private Map<String,Set<Method>> keys = null; |
| private final Object backingObject; |
| private final Class< ? > theInterface; |
| |
| DynamicInterfaceFacade(Object backingObject, Class< ? > intf, |
| ConvertingImpl convertingImpl) { |
| super(convertingImpl); |
| this.backingObject = backingObject; |
| this.theInterface = intf; |
| } |
| |
| @Override |
| public Object get(Object key) { |
| Set<Method> set = getKeys().get(key); |
| if (set == null) |
| return null; |
| for (Iterator<Method> iterator = set.iterator(); iterator.hasNext();) { |
| Method m = iterator.next(); |
| if (m.getParameterTypes().length > 0) |
| continue; |
| try { |
| return m.invoke(backingObject); |
| } catch (Exception e) { |
| if (RuntimeException.class |
| .isAssignableFrom(e.getCause().getClass())) |
| throw ((RuntimeException) e.getCause()); |
| throw new RuntimeException(e); |
| } |
| } |
| throw new ConversionException("Missing no-arg method for key: " + key); |
| } |
| |
| @Override |
| public Set<String> keySet() { |
| return getKeys().keySet(); |
| } |
| |
| private Map<String,Set<Method>> getKeys() { |
| if (keys == null) |
| keys = Util.getInterfaceKeys(theInterface, backingObject); |
| |
| return keys; |
| } |
| } |