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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 package android.databinding.tool.expr;
     17 
     18 import android.databinding.InverseBindingListener;
     19 import android.databinding.tool.InverseBinding;
     20 import android.databinding.tool.reflection.ModelAnalyzer;
     21 import android.databinding.tool.reflection.ModelClass;
     22 import android.databinding.tool.writer.KCode;
     23 import android.databinding.tool.writer.LayoutBinderWriterKt;
     24 
     25 import java.util.List;
     26 
     27 /**
     28  * TwoWayListenerExpr is used to set the event listener for a two-way binding expression.
     29  */
     30 public class TwoWayListenerExpr extends Expr {
     31     final InverseBinding mInverseBinding;
     32 
     33     public TwoWayListenerExpr(InverseBinding inverseBinding) {
     34         mInverseBinding = inverseBinding;
     35     }
     36 
     37     @Override
     38     protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) {
     39         return modelAnalyzer.findClass(InverseBindingListener.class);
     40     }
     41 
     42     @Override
     43     protected List<Dependency> constructDependencies() {
     44         return constructDynamicChildrenDependencies();
     45     }
     46 
     47     @Override
     48     protected KCode generateCode() {
     49         final String fieldName = LayoutBinderWriterKt.getFieldName(mInverseBinding);
     50         return new KCode(fieldName);
     51     }
     52 
     53     @Override
     54     public Expr cloneToModel(ExprModel model) {
     55         return model.twoWayListenerExpr(mInverseBinding);
     56     }
     57 
     58     @Override
     59     protected String computeUniqueKey() {
     60         return "event(" + mInverseBinding.getEventAttribute() + ", " +
     61                 System.identityHashCode(mInverseBinding) + ")";
     62     }
     63 
     64     @Override
     65     public String getInvertibleError() {
     66         return "Inverted expressions are already inverted!";
     67     }
     68 }
     69