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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.expr;
     18 
     19 import android.databinding.tool.reflection.ModelAnalyzer;
     20 import android.databinding.tool.reflection.ModelClass;
     21 import android.databinding.tool.writer.KCode;
     22 
     23 import java.util.List;
     24 
     25 public class InstanceOfExpr extends Expr {
     26     final String mTypeStr;
     27     ModelClass mType;
     28 
     29     InstanceOfExpr(Expr left, String type) {
     30         super(left);
     31         mTypeStr = type;
     32     }
     33 
     34     @Override
     35     protected String computeUniqueKey() {
     36         return join("instanceof", super.computeUniqueKey(), mTypeStr);
     37     }
     38 
     39     @Override
     40     protected KCode generateCode() {
     41         return new KCode()
     42                 .app("", getExpr().toCode())
     43                 .app(" instanceof ")
     44                 .app(getType().toJavaCode());
     45     }
     46 
     47     @Override
     48     public Expr cloneToModel(ExprModel model) {
     49         return model.instanceOfOp(getExpr().cloneToModel(model), mTypeStr);
     50     }
     51 
     52     @Override
     53     protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) {
     54         mType = modelAnalyzer.findClass(mTypeStr, getModel().getImports());
     55         return modelAnalyzer.loadPrimitive("boolean");
     56     }
     57 
     58     @Override
     59     protected List<Dependency> constructDependencies() {
     60         return constructDynamicChildrenDependencies();
     61     }
     62 
     63     public Expr getExpr() {
     64         return getChildren().get(0);
     65     }
     66 
     67     public ModelClass getType() {
     68         return mType;
     69     }
     70 
     71     @Override
     72     public String getInvertibleError() {
     73         return "two-way binding can't target a value with the 'instanceof' operator";
     74     }
     75 
     76     @Override
     77     public String toString() {
     78         return getExpr().toString() + " instanceof " + mTypeStr;
     79     }
     80 }
     81