1090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/* 27dd252788645e940eada959bdde927426e2531c9Paul Duffin * Copyright (C) 2012 The Guava Authors 3090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 4090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Licensed under the Apache License, Version 2.0 (the "License"); 5090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * you may not use this file except in compliance with the License. 6090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * You may obtain a copy of the License at 7090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 8090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 9090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 10090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Unless required by applicable law or agreed to in writing, software 11090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 12090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * See the License for the specific language governing permissions and 14090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * limitations under the License. 15090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 16090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 177dd252788645e940eada959bdde927426e2531c9Paul Duffinpackage com.google.common.reflect; 18090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkArgument; 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 217dd252788645e940eada959bdde927426e2531c9Paul Duffinimport java.lang.reflect.ParameterizedType; 227dd252788645e940eada959bdde927426e2531c9Paul Duffinimport java.lang.reflect.Type; 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 24090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/** 257dd252788645e940eada959bdde927426e2531c9Paul Duffin * Captures the actual type of {@code T}. 26090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 277dd252788645e940eada959bdde927426e2531c9Paul Duffin * @author Ben Yu 28090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 297dd252788645e940eada959bdde927426e2531c9Paul Duffinabstract class TypeCapture<T> { 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 317dd252788645e940eada959bdde927426e2531c9Paul Duffin /** Returns the captured type. */ 327dd252788645e940eada959bdde927426e2531c9Paul Duffin final Type capture() { 337dd252788645e940eada959bdde927426e2531c9Paul Duffin Type superclass = getClass().getGenericSuperclass(); 340888a09821a98ac0680fad765217302858e70fa4Paul Duffin checkArgument(superclass instanceof ParameterizedType, 350888a09821a98ac0680fad765217302858e70fa4Paul Duffin "%s isn't parameterized", superclass); 367dd252788645e940eada959bdde927426e2531c9Paul Duffin return ((ParameterizedType) superclass).getActualTypeArguments()[0]; 37090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson } 38090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson} 39