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&lt;String&gt; powers = {@link org.fest.reflect.core.Reflection#staticMethod(String) staticMethod}("getCommonPowers").{@link StaticMethodName#withReturnType(TypeRef) withReturnType}(new {@link TypeRef TypeRef}&lt;List&lt;String&gt;&gt;() {})
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    }