001 /* 002 * Created on Aug 17, 2007 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 @2007-2009 the original author or authors. 015 */ 016 package org.fest.reflect.method; 017 018 import static org.fest.reflect.method.Invoker.newInvoker; 019 020 import org.fest.reflect.reference.TypeRef; 021 022 /** 023 * Understands the parameter types of the static method to invoke. 024 * <p> 025 * The following is an example of proper usage of this class: 026 * <pre> 027 * // Equivalent to call 'Jedi.setCommonPower("Jump")' 028 * {@link org.fest.reflect.core.Reflection#staticMethod(String) staticMethod}("setCommonPower").{@link StaticMethodName#withParameterTypes(Class...) withParameterTypes}(String.class) 029 * .{@link StaticMethodParameterTypes#in(Class) in}(Jedi.class) 030 * .{@link Invoker#invoke(Object...) invoke}("Jump"); 031 * 032 * // Equivalent to call 'Jedi.addPadawan()' 033 * {@link org.fest.reflect.core.Reflection#staticMethod(String) staticMethod}("addPadawan").{@link StaticMethodName#in(Class) in}(Jedi.class).{@link Invoker#invoke(Object...) invoke}(); 034 * 035 * // Equivalent to call 'Jedi.commonPowerCount()' 036 * String name = {@link org.fest.reflect.core.Reflection#staticMethod(String) staticMethod}("commonPowerCount").{@link StaticMethodName#withReturnType(Class) withReturnType}(String.class) 037 * .{@link StaticMethodReturnType#in(Class) in}(Jedi.class) 038 * .{@link Invoker#invoke(Object...) invoke}(); 039 * 040 * // Equivalent to call 'Jedi.getCommonPowers()' 041 * List<String> powers = {@link org.fest.reflect.core.Reflection#staticMethod(String) staticMethod}("getCommonPowers").{@link StaticMethodName#withReturnType(TypeRef) withReturnType}(new {@link TypeRef TypeRef}<List<String>>() {}) 042 * .{@link StaticMethodReturnTypeRef#in(Class) in}(Jedi.class) 043 * .{@link Invoker#invoke(Object...) invoke}(); 044 * </pre> 045 * </p> 046 * 047 * @param <T> the generic type of the static method's return type. 048 * 049 * @author Alex Ruiz 050 */ 051 public final class StaticMethodParameterTypes<T> { 052 053 static <T> StaticMethodParameterTypes<T> newParameterTypes(String name, Class<?>[] parameterTypes) { 054 if (parameterTypes == null) 055 throw new NullPointerException("The array of parameter types for the static method to access should not be null"); 056 return new StaticMethodParameterTypes<T>(name, parameterTypes); 057 } 058 059 private final String name; 060 private final Class<?>[] parameterTypes; 061 062 private StaticMethodParameterTypes(String name, Class<?>[] parameterTypes) { 063 this.name = name; 064 this.parameterTypes = parameterTypes; 065 } 066 067 /** 068 * Creates a new method invoker. 069 * @param target the class containing the static method to invoke. 070 * @return the created method invoker. 071 * @throws NullPointerException if the given target is <code>null</code>. 072 */ 073 public Invoker<T> in(Class<?> target) { 074 return newInvoker(name, target, parameterTypes); 075 } 076 }