MathExpr.java revision 2611838bffef5a009ca71e3e9e59a93f29b098ed 
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
17package android.databinding.tool.expr;
18
19import android.databinding.tool.reflection.ModelAnalyzer;
20import android.databinding.tool.reflection.ModelClass;
21
22import java.util.List;
23
24public class MathExpr extends Expr {
25    final String mOp;
26    MathExpr(Expr left, String op, Expr right) {
27        super(left, right);
28        mOp = op;
29    }
30
31    @Override
32    protected String computeUniqueKey() {
33        return join(getLeft().getUniqueKey(), mOp, getRight().getUniqueKey());
34    }
35
36    @Override
37    protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) {
38        if ("+".equals(mOp)) {
39            // TODO we need upper casting etc.
40            if (getLeft().getResolvedType().isString()
41                    || getRight().getResolvedType().isString()) {
42                return modelAnalyzer.findClass(String.class);
43            }
44        }
45        return modelAnalyzer.findCommonParentOf(getLeft().getResolvedType(),
46                getRight().getResolvedType());
47    }
48
49    @Override
50    protected List<Dependency> constructDependencies() {
51        return constructDynamicChildrenDependencies();
52    }
53
54    public String getOp() {
55        return mOp;
56    }
57
58    public Expr getLeft() {
59        return getChildren().get(0);
60    }
61
62    public Expr getRight() {
63        return getChildren().get(1);
64    }
65}
66