1 /*
2  * Copyright (C) 2010 Google, Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.google.inject.persist.finder;
18 
19 import java.lang.reflect.Method;
20 
21 /**
22  * Utility that helps you introspect dynamic finder methods.
23  *
24  * @author dhanji@gmail.com (Dhanji R. Prasanna)
25  */
26 public final class DynamicFinder {
27   private final Method method;
28   private final Finder finder;
29 
DynamicFinder(Method method)30   public DynamicFinder(Method method) {
31     this.method = method;
32     this.finder = method.getAnnotation(Finder.class);
33   }
34 
35   /**
36    * Returns some metadata if the method is annotated {@code @Finder} or null.
37    *
38    * @param method a method you want to test as a dynamic finder
39    */
from(Method method)40   public static DynamicFinder from(Method method) {
41     return method.isAnnotationPresent(Finder.class) ? new DynamicFinder(method) : null;
42   }
43 
metadata()44   public Finder metadata() {
45     return finder;
46   }
47 }
48