1 /* 2 * Copyright (C) 2015 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.expr.Expr; 20 import android.databinding.tool.expr.ExprModel; 21 import android.databinding.tool.processing.Scope; 22 import android.databinding.tool.processing.scopes.FileScopeProvider; 23 import android.databinding.tool.processing.scopes.LocationScopeProvider; 24 import android.databinding.tool.reflection.ModelAnalyzer; 25 import android.databinding.tool.reflection.ModelClass; 26 import android.databinding.tool.store.Location; 27 import android.databinding.tool.store.ResourceBundle; 28 import android.databinding.tool.store.SetterStore; 29 import android.databinding.tool.util.L; 30 import android.databinding.tool.util.Preconditions; 31 32 import java.util.ArrayList; 33 import java.util.Arrays; 34 import java.util.HashMap; 35 import java.util.List; 36 import java.util.Map; 37 38 public class BindingTarget implements LocationScopeProvider { 39 List<Binding> mBindings = new ArrayList<Binding>(); 40 ExprModel mModel; 41 ModelClass mResolvedClass; 42 43 // if this target presents itself in multiple layout files with different view types, 44 // it receives an interface type and should use it in the getter instead. 45 private ResourceBundle.BindingTargetBundle mBundle; 46 BindingTarget(ResourceBundle.BindingTargetBundle bundle)47 public BindingTarget(ResourceBundle.BindingTargetBundle bundle) { 48 mBundle = bundle; 49 } 50 isUsed()51 public boolean isUsed() { 52 return mBundle.isUsed(); 53 } 54 addBinding(String name, Expr expr)55 public void addBinding(String name, Expr expr) { 56 mBindings.add(new Binding(this, name, expr)); 57 } 58 getInterfaceType()59 public String getInterfaceType() { 60 return mBundle.getInterfaceType() == null ? mBundle.getFullClassName() : mBundle.getInterfaceType(); 61 } 62 63 @Override provideScopeLocation()64 public List<Location> provideScopeLocation() { 65 return mBundle.provideScopeLocation(); 66 } 67 getId()68 public String getId() { 69 return mBundle.getId(); 70 } 71 getTag()72 public String getTag() { 73 return mBundle.getTag(); 74 } 75 getOriginalTag()76 public String getOriginalTag() { 77 return mBundle.getOriginalTag(); 78 } 79 getViewClass()80 public String getViewClass() { 81 return mBundle.getFullClassName(); 82 } 83 getResolvedType()84 public ModelClass getResolvedType() { 85 if (mResolvedClass == null) { 86 mResolvedClass = ModelAnalyzer.getInstance().findClass(mBundle.getFullClassName(), 87 mModel.getImports()); 88 } 89 return mResolvedClass; 90 } 91 getIncludedLayout()92 public String getIncludedLayout() { 93 return mBundle.getIncludedLayout(); 94 } 95 isBinder()96 public boolean isBinder() { 97 return getIncludedLayout() != null; 98 } 99 supportsTag()100 public boolean supportsTag() { 101 return !SetterStore.get(ModelAnalyzer.getInstance()) 102 .isUntaggable(mBundle.getFullClassName()); 103 } 104 getBindings()105 public List<Binding> getBindings() { 106 return mBindings; 107 } 108 getModel()109 public ExprModel getModel() { 110 return mModel; 111 } 112 setModel(ExprModel model)113 public void setModel(ExprModel model) { 114 mModel = model; 115 } 116 117 /** 118 * Called after BindingTarget is finalized. 119 * <p> 120 * We traverse all bindings and ask SetterStore to figure out if any can be combined. 121 * When N bindings are combined, they are demoted from being a binding expression and a new 122 * ArgList expression is added as the new binding expression that depends on others. 123 */ resolveMultiSetters()124 public void resolveMultiSetters() { 125 L.d("resolving multi setters for %s", getId()); 126 final SetterStore setterStore = SetterStore.get(ModelAnalyzer.getInstance()); 127 final String[] attributes = new String[mBindings.size()]; 128 final ModelClass[] types = new ModelClass[mBindings.size()]; 129 for (int i = 0; i < mBindings.size(); i ++) { 130 Binding binding = mBindings.get(i); 131 try { 132 Scope.enter(binding); 133 attributes[i] = binding.getName(); 134 types[i] = binding.getExpr().getResolvedType(); 135 } finally { 136 Scope.exit(); 137 } 138 } 139 final List<SetterStore.MultiAttributeSetter> multiAttributeSetterCalls = setterStore 140 .getMultiAttributeSetterCalls(attributes, getResolvedType(), types); 141 if (multiAttributeSetterCalls.isEmpty()) { 142 return; 143 } 144 final Map<String, Binding> lookup = new HashMap<String, Binding>(); 145 for (Binding binding : mBindings) { 146 String name = binding.getName(); 147 if (name.startsWith("android:")) { 148 lookup.put(name, binding); 149 } else { 150 int ind = name.indexOf(":"); 151 if (ind == -1) { 152 lookup.put(name, binding); 153 } else { 154 lookup.put(name.substring(ind + 1), binding); 155 } 156 } 157 } 158 List<MergedBinding> mergeBindings = new ArrayList<MergedBinding>(); 159 for (final SetterStore.MultiAttributeSetter setter : multiAttributeSetterCalls) { 160 L.d("resolved %s", setter); 161 final List<Binding> mergedBindings = new ArrayList<>(); 162 for (String attribute : setter.attributes) { 163 Binding binding = lookup.get(attribute); 164 Preconditions.checkNotNull(binding, "cannot find binding for %s", attribute); 165 mergedBindings.add(binding); 166 } 167 168 for (Binding binding : mergedBindings) { 169 binding.getExpr().setBindingExpression(false); 170 mBindings.remove(binding); 171 } 172 MergedBinding mergedBinding = new MergedBinding(getModel(), setter, this, 173 mergedBindings); 174 mergeBindings.add(mergedBinding); 175 } 176 for (MergedBinding binding : mergeBindings) { 177 mBindings.add(binding); 178 } 179 } 180 } 181