1 // Copyright 2015 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 package org.chromium.base; 6 7 import org.chromium.base.annotations.CalledByNative; 8 9 /** 10 * A simple single-argument callback to handle the result of a computation. 11 * 12 * @param <T> The type of the computation's result. 13 */ 14 public abstract class Callback<T> { 15 /** 16 * Invoked with the result of a computation. 17 */ onResult(T result)18 public abstract void onResult(T result); 19 20 @SuppressWarnings("unchecked") 21 @CalledByNative onResultFromNative(Object result)22 private void onResultFromNative(Object result) { 23 onResult((T) result); 24 } 25 26 @SuppressWarnings("unchecked") 27 @CalledByNative onResultFromNative(boolean result)28 private void onResultFromNative(boolean result) { 29 onResult((T) Boolean.valueOf(result)); 30 } 31 32 @SuppressWarnings("unchecked") 33 @CalledByNative onResultFromNative(int result)34 private void onResultFromNative(int result) { 35 onResult((T) Integer.valueOf(result)); 36 } 37 } 38