1 /* 2 * Copyright (C) 2016 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 android.databinding.tool; 18 19 import android.databinding.tool.reflection.ModelClass; 20 import android.databinding.tool.reflection.ModelMethod; 21 import android.databinding.tool.util.L; 22 import android.databinding.tool.util.Preconditions; 23 24 /** 25 * As data-binding finds lambda expressions, it creates classes that can wrap those callbacks 26 * into methods that can be called into the ViewDataBinding classes. 27 * <p> 28 * The model keeps track of these wrappers and at the end data-binding generates all of them. 29 * These are stripped from library projects and re-generated. 30 */ 31 public class CallbackWrapper { 32 public static String SOURCE_ID = "sourceId"; 33 public static String ARG_PREFIX = "callbackArg_"; 34 public final ModelClass klass; 35 public final ModelMethod method; 36 public final String key; 37 private static final String PACKAGE = "android.databinding.generated.callback"; 38 private static final String LISTENER_NAME = "Listener"; 39 private String mClassName; 40 private String mListenerMethodName; 41 private boolean mInitialized; 42 43 public CallbackWrapper(ModelClass klass, ModelMethod method) { 44 this.klass = klass; 45 this.method = method; 46 this.key = uniqueKey(klass, method); 47 } 48 49 public void prepare(String className, String listenerMethodName) { 50 if (mInitialized) { 51 L.e("trying to initialize listener wrapper twice."); 52 } 53 mInitialized = true; 54 mClassName = className; 55 mListenerMethodName = listenerMethodName; 56 } 57 58 public String getPackage() { 59 return PACKAGE; 60 } 61 62 public String getClassName() { 63 Preconditions.check(mInitialized, "Listener wrapper is not initialized yet."); 64 return mClassName; 65 } 66 67 public String getListenerInterfaceName() { 68 return LISTENER_NAME; 69 } 70 71 public String getListenerMethodName() { 72 Preconditions.check(mInitialized, "Listener wrapper is not initialized yet."); 73 return mListenerMethodName; 74 } 75 76 public static String uniqueKey(ModelClass klass, ModelMethod method) { 77 String base = klass.getCanonicalName() + "#" + method.getName(); 78 for (ModelClass param : method.getParameterTypes()) { 79 base += param + ","; 80 } 81 return base; 82 } 83 84 public String getCannonicalName() { 85 return getPackage() + "." + getClassName(); 86 } 87 88 public String getCannonicalListenerName() { 89 return getPackage() + "." + getClassName() + "." + getListenerInterfaceName(); 90 } 91 92 public String constructForIdentifier(int listenerId) { 93 return "new " + getCannonicalName() + "(this, " + listenerId + ")"; 94 } 95 96 public int getMinApi() { 97 return Math.min(method.getMinApi(), klass.getMinApi()); 98 } 99 } 100
