| /* |
| * Copyright 2004-2005 the original author or authors. |
| * |
| * 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.codehaus.groovy.grails.commons.metaclass; |
| |
| import groovy.lang.MissingPropertyException; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * A generic dyanmic property for any type |
| * |
| * @author Graeme Rocher |
| * @since Oct 27, 2005 |
| */ |
| public class GenericDynamicProperty extends AbstractDynamicProperty { |
| |
| private Class type; |
| private boolean readyOnly; |
| private Map propertyToInstanceMap = Collections.synchronizedMap(new HashMap()); |
| private Object initialValue; |
| /** |
| * |
| * @param propertyName The name of the property |
| * @param type The type of the property |
| * @param initialValue The initial value of the property |
| * @param readOnly True for read-only property |
| */ |
| public GenericDynamicProperty(String propertyName, Class type,Object initialValue,boolean readOnly) { |
| super(propertyName); |
| if(type == null) |
| throw new IllegalArgumentException("Constructor argument 'type' cannot be null"); |
| this.readyOnly = readOnly; |
| this.type = type;; |
| this.initialValue = initialValue; |
| } |
| /** |
| * |
| * @param propertyName The name of the property |
| * @param type The type of the property |
| * @param readOnly True for read-only property |
| */ |
| public GenericDynamicProperty(String propertyName, Class type,boolean readOnly) { |
| super(propertyName); |
| if(type == null) |
| throw new IllegalArgumentException("Constructor argument 'type' cannot be null"); |
| this.readyOnly = readOnly; |
| this.type = type;; |
| } |
| |
| |
| public Object get(Object object) { |
| String propertyKey = System.identityHashCode(object) + getPropertyName(); |
| if(propertyToInstanceMap.containsKey(propertyKey)) { |
| return propertyToInstanceMap.get(propertyKey); |
| } |
| else if(this.initialValue != null) { |
| propertyToInstanceMap.put(propertyKey, this.initialValue); |
| return this.initialValue; |
| } |
| return null; |
| } |
| |
| public void set(Object object, Object newValue) { |
| if(!readyOnly) { |
| if(newValue == null) { |
| propertyToInstanceMap.put(String.valueOf(System.identityHashCode(object)) + getPropertyName(), null ); |
| } |
| else if(this.type.isInstance(newValue)) |
| propertyToInstanceMap.put(String.valueOf(System.identityHashCode(object)) + getPropertyName(), newValue ); |
| else |
| throw new MissingPropertyException("Property '"+this.getPropertyName()+"' for object '"+object.getClass()+"' cannot be set with value '"+newValue+"'. Incorrect type.",object.getClass()); |
| } |
| else { |
| throw new MissingPropertyException("Property '"+this.getPropertyName()+"' for object '"+object.getClass()+"' is read-only!",object.getClass()); |
| } |
| } |
| } |