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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 ComparisonExpr extends Expr {
     26     final String mOp;
     27     ComparisonExpr(String op, Expr left, Expr right) {
     28         super(left, right);
     29         mOp = op;
     30     }
     31 
     32     @Override
     33     protected String computeUniqueKey() {
     34         return join(mOp, super.computeUniqueKey());
     35     }
     36 
     37     @Override
     38     protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) {
     39         return modelAnalyzer.loadPrimitive("boolean");
     40     }
     41 
     42     @Override
     43     protected List<Dependency> constructDependencies() {
     44         return constructDynamicChildrenDependencies();
     45     }
     46 
     47     public String getOp() {
     48         return mOp;
     49     }
     50 
     51     public Expr getLeft() {
     52         return getChildren().get(0);
     53     }
     54 
     55     public Expr getRight() {
     56         return getChildren().get(1);
     57     }
     58 
     59     @Override
     60     public boolean isEqualityCheck() {
     61         return "==".equals(mOp.trim());
     62     }
     63 
     64     @Override
     65     protected KCode generateCode(boolean expand) {
     66         return new KCode().app("", getLeft().toCode(expand))
     67         .app(" ").app(getOp()).app(" ")
     68         .app("", getRight().toCode(expand));
     69     }
     70 
     71     @Override
     72     public String getInvertibleError() {
     73         return "Comparison operators are not valid as targets of two-way binding";
     74     }
     75 }
     76