Coverage Summary for Class: TypeCapture (com.google.common.reflect)

1 /*
2  * Copyright (C) 2012 The Guava Authors
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5  * in compliance with the License. You may obtain a copy of the License at
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the License
10  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11  * or implied. See the License for the specific language governing permissions and limitations under
12  * the License.
13  */
14 
15 package com.google.common.reflect;
16 
17 import static com.google.common.base.Preconditions.checkArgument;
18 
19 import java.lang.reflect.ParameterizedType;
20 import java.lang.reflect.Type;
21 
22 /**
23  * Captures the actual type of {@code T}.
24  *
25  * @author Ben Yu
26  */
27 @ElementTypesAreNonnullByDefault
28 abstract class TypeCapture<T> {
29 
30   /** Returns the captured type. */
31   final Type capture() {
32     Type superclass = getClass().getGenericSuperclass();
33     checkArgument(superclass instanceof ParameterizedType, "%s isn't parameterized", superclass);
34     return ((ParameterizedType) superclass).getActualTypeArguments()[0];
35   }
36 }