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      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.CallbackArgExpr;
     20 import android.databinding.tool.expr.CallbackExprModel;
     21 import android.databinding.tool.expr.Expr;
     22 import android.databinding.tool.expr.ExprModel;
     23 import android.databinding.tool.expr.FieldAccessExpr;
     24 import android.databinding.tool.expr.IdentifierExpr;
     25 import android.databinding.tool.processing.ErrorMessages;
     26 import android.databinding.tool.processing.Scope;
     27 import android.databinding.tool.processing.scopes.LocationScopeProvider;
     28 import android.databinding.tool.reflection.ModelAnalyzer;
     29 import android.databinding.tool.reflection.ModelClass;
     30 import android.databinding.tool.solver.ExecutionPath;
     31 import android.databinding.tool.store.Location;
     32 import android.databinding.tool.store.SetterStore;
     33 import android.databinding.tool.store.SetterStore.BindingGetterCall;
     34 import android.databinding.tool.store.SetterStore.BindingSetterCall;
     35 import android.databinding.tool.util.L;
     36 
     37 import java.util.ArrayList;
     38 import java.util.List;
     39 
     40 public class InverseBinding implements LocationScopeProvider {
     41 
     42     private final String mName;
     43     private final Expr mExpr;
     44     private final BindingTarget mTarget;
     45     private BindingGetterCall mGetterCall;
     46     private final ArrayList<FieldAccessExpr> mChainedExpressions = new ArrayList<FieldAccessExpr>();
     47     private final CallbackExprModel mCallbackExprModel;
     48     private final Expr mInverseExpr;
     49     private final CallbackArgExpr mVariableExpr;
     50     private final ExecutionPath mExecutionPath;
     51 
     52     public InverseBinding(BindingTarget target, String name, Expr expr, String bindingClassName) {
     53         mTarget = target;
     54         mName = name;
     55         mCallbackExprModel = new CallbackExprModel(expr.getModel());
     56         mExpr = expr.cloneToModel(mCallbackExprModel);
     57         setGetterCall(mExpr);
     58         mVariableExpr = mCallbackExprModel.callbackArg("callbackArg_0");
     59         ModelAnalyzer modelAnalyzer = ModelAnalyzer.getInstance();
     60         ModelClass type = modelAnalyzer.findClass(getGetterCall().getGetterType(), null);
     61         mVariableExpr.setClassFromCallback(type);
     62         mVariableExpr.setUserDefinedType(getGetterCall().getGetterType());
     63         mInverseExpr =
     64                 mExpr.generateInverse(mCallbackExprModel, mVariableExpr, bindingClassName);
     65         mExecutionPath = ExecutionPath.createRoot();
     66         mInverseExpr.toExecutionPath(mExecutionPath);
     67         mCallbackExprModel.seal();
     68     }
     69 
     70     public InverseBinding(BindingTarget target, String name, BindingGetterCall getterCall) {
     71         mTarget = target;
     72         mName = name;
     73         mExpr = null;
     74         mCallbackExprModel = null;
     75         mInverseExpr = null;
     76         mVariableExpr = null;
     77         mExecutionPath = null;
     78         setGetterCall(getterCall);
     79     }
     80 
     81     @Override
     82     public List<Location> provideScopeLocation() {
     83         if (mExpr != null) {
     84             return mExpr.getLocations();
     85         } else {
     86             return mChainedExpressions.get(0).getLocations();
     87         }
     88     }
     89 
     90     private void setGetterCall(BindingGetterCall getterCall) {
     91         mGetterCall = getterCall;
     92     }
     93 
     94     public void addChainedExpression(FieldAccessExpr expr) {
     95         mChainedExpressions.add(expr);
     96     }
     97 
     98     public boolean isOnBinder() {
     99         return mTarget.getResolvedType().isViewDataBinding();
    100     }
    101 
    102     private void setGetterCall(Expr expr) {
    103         try {
    104             Scope.enter(mTarget);
    105             Scope.enter(this);
    106             ModelClass viewType = mTarget.getResolvedType();
    107             final SetterStore setterStore = SetterStore.get(ModelAnalyzer.getInstance());
    108             final ModelClass resolvedType = expr == null ? null : expr.getResolvedType();
    109             mGetterCall = setterStore.getGetterCall(mName, viewType, resolvedType,
    110                     expr.getModel().getImports());
    111             if (mGetterCall == null) {
    112                 L.e(ErrorMessages.CANNOT_FIND_GETTER_CALL, mName,
    113                         expr == null ? "Unknown" : mExpr.getResolvedType(),
    114                         mTarget.getResolvedType());
    115             }
    116         } finally {
    117             Scope.exit();
    118             Scope.exit();
    119         }
    120     }
    121 
    122     public SetterStore.BindingGetterCall getGetterCall() {
    123         return mGetterCall;
    124     }
    125 
    126     public BindingTarget getTarget() {
    127         return mTarget;
    128     }
    129 
    130     public Expr getExpr() {
    131         return mExpr;
    132     }
    133 
    134     public Expr getInverseExpr() {
    135         return mInverseExpr;
    136     }
    137 
    138     public IdentifierExpr getVariableExpr() {
    139         return mVariableExpr;
    140     }
    141 
    142     public ExecutionPath getExecutionPath() {
    143         return mExecutionPath;
    144     }
    145 
    146     public CallbackExprModel getCallbackExprModel() {
    147         return mCallbackExprModel;
    148     }
    149 
    150     public List<FieldAccessExpr> getChainedExpressions() {
    151         return mChainedExpressions;
    152     }
    153 
    154     public String getBindingAdapterInstanceClass() {
    155         return getGetterCall().getBindingAdapterInstanceClass();
    156     }
    157 
    158     /**
    159      * The min api level in which this binding should be executed.
    160      * <p>
    161      * This should be the minimum value among the dependencies of this binding.
    162      */
    163     public int getMinApi() {
    164         final BindingGetterCall getterCall = getGetterCall();
    165         return Math.max(getterCall.getMinApi(), getterCall.getEvent().getMinApi());
    166     }
    167 
    168     public BindingSetterCall getEventSetter() {
    169         final BindingGetterCall getterCall = getGetterCall();
    170         return getterCall.getEvent();
    171     }
    172 
    173     public String getName() {
    174         return mName;
    175     }
    176 
    177     public String getEventAttribute() {
    178         return getGetterCall().getEventAttribute();
    179     }
    180 
    181     public ExprModel getModel() {
    182         if (mExpr != null) {
    183             return mExpr.getModel();
    184         }
    185         return mChainedExpressions.get(0).getModel();
    186     }
    187 }
    188