TernaryExpr.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.ArrayList;
23import java.util.BitSet;
24import java.util.List;
25
26public class TernaryExpr extends Expr {
27    TernaryExpr(Expr pred, Expr ifTrue, Expr ifFalse) {
28        super(pred, ifTrue, ifFalse);
29    }
30
31    public Expr getPred() {
32        return getChildren().get(0);
33    }
34
35    public Expr getIfTrue() {
36        return getChildren().get(1);
37    }
38
39    public Expr getIfFalse() {
40        return getChildren().get(2);
41    }
42
43    @Override
44    protected String computeUniqueKey() {
45        return "?:" + super.computeUniqueKey();
46    }
47
48    @Override
49    protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) {
50        return modelAnalyzer.findCommonParentOf(getIfTrue().getResolvedType(),
51                getIfFalse().getResolvedType());
52    }
53
54    @Override
55    protected List<Dependency> constructDependencies() {
56        List<Dependency> deps = new ArrayList<>();
57        Expr predExpr = getPred();
58        if (predExpr.isDynamic()) {
59            final Dependency pred = new Dependency(this, predExpr);
60            pred.setMandatory(true);
61            deps.add(pred);
62        }
63        Expr ifTrueExpr = getIfTrue();
64        if (ifTrueExpr.isDynamic()) {
65            deps.add(new Dependency(this, ifTrueExpr, predExpr, true));
66        }
67        Expr ifFalseExpr = getIfFalse();
68        if (ifFalseExpr.isDynamic()) {
69            deps.add(new Dependency(this, ifFalseExpr, predExpr, false));
70        }
71        return deps;
72    }
73
74    @Override
75    protected BitSet getPredicateInvalidFlags() {
76        return getPred().getInvalidFlags();
77    }
78
79    @Override
80    public boolean isConditional() {
81        return true;
82    }
83}
84