1 /* 2 * Copyright (C) 2008 The Android Open Source Project 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.android.tools.layoutlib.create; 18 19 import java.util.HashMap; 20 21 /** 22 * Allows stub methods from LayoutLib to be overriden at runtime. 23 * <p/> 24 * Implementation note: all types required by this class(inner/outer classes & interfaces) 25 * must be referenced by the injectClass argument to {@link AsmGenerator} in Main.java; 26 * Otherwise they won't be accessible in layoutlib.jar at runtime. 27 */ 28 public final class OverrideMethod { 29 30 /** Map of method overridden. */ 31 private static HashMap<String, MethodListener> sMethods = new HashMap<String, MethodListener>(); 32 /** Default listener for all method not listed in sMethods. Nothing if null. */ 33 private static MethodListener sDefaultListener = null; 34 35 /** 36 * Sets the default listener for all methods not specifically handled. 37 * Null means to do nothing. 38 */ setDefaultListener(MethodListener listener)39 public static void setDefaultListener(MethodListener listener) { 40 sDefaultListener = listener; 41 } 42 43 /** 44 * Defines or reset a listener for the given method signature. 45 * 46 * @param signature The signature of the method being invoked, composed of the 47 * binary class name followed by the method descriptor (aka argument 48 * types). Example: "com/foo/MyClass/InnerClass/printInt(I)V" 49 * @param listener The new listener. Removes it if null. 50 */ setMethodListener(String signature, MethodListener listener)51 public static void setMethodListener(String signature, MethodListener listener) { 52 if (listener == null) { 53 sMethods.remove(signature); 54 } else { 55 sMethods.put(signature, listener); 56 } 57 } 58 59 /** 60 * Invokes the specific listener for the given signature or the default one if defined. 61 * <p/> 62 * This version invokes the method listener for the void return type. 63 * <p/> 64 * Note: this is not intended to be used by the LayoutLib Bridge. It is intended to be called 65 * by the stubbed methods generated by the LayoutLib_create tool. 66 * 67 * @param signature The signature of the method being invoked, composed of the 68 * binary class name followed by the method descriptor (aka argument 69 * types). Example: "com/foo/MyClass/InnerClass/printInt(I)V". 70 * @param isNative True if the method was a native method. 71 * @param caller The calling object. Null for static methods, "this" for instance methods. 72 */ invokeV(String signature, boolean isNative, Object caller)73 public static void invokeV(String signature, boolean isNative, Object caller) { 74 MethodListener i = sMethods.get(signature); 75 if (i != null) { 76 i.onInvokeV(signature, isNative, caller); 77 } else if (sDefaultListener != null) { 78 sDefaultListener.onInvokeV(signature, isNative, caller); 79 } 80 } 81 82 /** 83 * Invokes the specific listener for the int return type. 84 * @see #invokeV(String, boolean, Object) 85 */ invokeI(String signature, boolean isNative, Object caller)86 public static int invokeI(String signature, boolean isNative, Object caller) { 87 MethodListener i = sMethods.get(signature); 88 if (i != null) { 89 return i.onInvokeI(signature, isNative, caller); 90 } else if (sDefaultListener != null) { 91 return sDefaultListener.onInvokeI(signature, isNative, caller); 92 } 93 return 0; 94 } 95 96 /** 97 * Invokes the specific listener for the long return type. 98 * @see #invokeV(String, boolean, Object) 99 */ invokeL(String signature, boolean isNative, Object caller)100 public static long invokeL(String signature, boolean isNative, Object caller) { 101 MethodListener i = sMethods.get(signature); 102 if (i != null) { 103 return i.onInvokeL(signature, isNative, caller); 104 } else if (sDefaultListener != null) { 105 return sDefaultListener.onInvokeL(signature, isNative, caller); 106 } 107 return 0; 108 } 109 110 /** 111 * Invokes the specific listener for the float return type. 112 * @see #invokeV(String, boolean, Object) 113 */ invokeF(String signature, boolean isNative, Object caller)114 public static float invokeF(String signature, boolean isNative, Object caller) { 115 MethodListener i = sMethods.get(signature); 116 if (i != null) { 117 return i.onInvokeF(signature, isNative, caller); 118 } else if (sDefaultListener != null) { 119 return sDefaultListener.onInvokeF(signature, isNative, caller); 120 } 121 return 0; 122 } 123 124 /** 125 * Invokes the specific listener for the double return type. 126 * @see #invokeV(String, boolean, Object) 127 */ invokeD(String signature, boolean isNative, Object caller)128 public static double invokeD(String signature, boolean isNative, Object caller) { 129 MethodListener i = sMethods.get(signature); 130 if (i != null) { 131 return i.onInvokeD(signature, isNative, caller); 132 } else if (sDefaultListener != null) { 133 return sDefaultListener.onInvokeD(signature, isNative, caller); 134 } 135 return 0; 136 } 137 138 /** 139 * Invokes the specific listener for the object return type. 140 * @see #invokeV(String, boolean, Object) 141 */ invokeA(String signature, boolean isNative, Object caller)142 public static Object invokeA(String signature, boolean isNative, Object caller) { 143 MethodListener i = sMethods.get(signature); 144 if (i != null) { 145 return i.onInvokeA(signature, isNative, caller); 146 } else if (sDefaultListener != null) { 147 return sDefaultListener.onInvokeA(signature, isNative, caller); 148 } 149 return null; 150 } 151 } 152