001 /* 002 * Created on Nov 23, 2009 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 005 * in compliance with the License. You may obtain a copy of the License at 006 * 007 * http://www.apache.org/licenses/LICENSE-2.0 008 * 009 * Unless required by applicable law or agreed to in writing, software distributed under the License 010 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 011 * or implied. See the License for the specific language governing permissions and limitations under 012 * the License. 013 * 014 * Copyright @2009 the original author or authors. 015 */ 016 package org.fest.reflect.beanproperty; 017 018 import static org.fest.reflect.beanproperty.Invoker.newInvoker; 019 020 import org.fest.reflect.exception.ReflectionError; 021 022 /** 023 * Understands the type of a property to access using Bean Instrospection. 024 * <p> 025 * The following is an example of proper usage of this class: 026 * <pre> 027 * // Retrieves the value of the property "name" 028 * String name = {@link org.fest.reflect.core.Reflection#property(String) property}("name").{@link PropertyName#ofType(Class) ofType}(String.class).{@link PropertyType#in(Object) in}(person).{@link Invoker#get() get}(); 029 * 030 * // Sets the value of the property "name" to "Yoda" 031 * {@link org.fest.reflect.core.Reflection#property(String) property}("name").{@link PropertyName#ofType(Class) ofType}(String.class).{@link PropertyType#in(Object) in}(person).{@link Invoker#set(Object) set}("Yoda"); 032 * </pre> 033 * </p> 034 * 035 * @param <T> the generic type of the property. 036 * 037 * @author Alex Ruiz 038 * 039 * @since 1.2 040 */ 041 public class PropertyType<T> { 042 043 static <T> PropertyType<T> newPropertyType(String name, Class<T> type) { 044 if (type == null) throw new NullPointerException("The type of the property to access should not be null"); 045 return new PropertyType<T>(name, type); 046 } 047 048 private final String name; 049 private final Class<T> type; 050 051 private PropertyType(String name, Class<T> type) { 052 this.name = name; 053 this.type = type; 054 } 055 056 /** 057 * Returns a new property invoker. A property invoker is capable of accessing (read/write) the underlying property. 058 * @param target the object containing the property of interest. 059 * @return the created property invoker. 060 * @throws NullPointerException if the given target is <code>null</code>. 061 * @throws ReflectionError if a property with a matching name and type cannot be found. 062 */ 063 public Invoker<T> in(Object target) { 064 if (target == null) throw new NullPointerException("Target should not be null"); 065 return newInvoker(name, type, target); 066 } 067 }