TernaryExpr.java revision e52882df6130221462bf07f5f2b52de5c4b0f8de 
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;
21import android.databinding.tool.writer.KCode;
22
23import java.util.ArrayList;
24import java.util.BitSet;
25import java.util.List;
26
27public class TernaryExpr extends Expr {
28    TernaryExpr(Expr pred, Expr ifTrue, Expr ifFalse) {
29        super(pred, ifTrue, ifFalse);
30    }
31
32    public Expr getPred() {
33        return getChildren().get(0);
34    }
35
36    public Expr getIfTrue() {
37        return getChildren().get(1);
38    }
39
40    public Expr getIfFalse() {
41        return getChildren().get(2);
42    }
43
44    @Override
45    protected String computeUniqueKey() {
46        return "?:" + super.computeUniqueKey();
47    }
48
49    @Override
50    protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) {
51        return modelAnalyzer.findCommonParentOf(getIfTrue().getResolvedType(),
52                getIfFalse().getResolvedType());
53    }
54
55    @Override
56    protected List<Dependency> constructDependencies() {
57        List<Dependency> deps = new ArrayList<>();
58        Expr predExpr = getPred();
59        if (predExpr.isDynamic()) {
60            final Dependency pred = new Dependency(this, predExpr);
61            pred.setMandatory(true);
62            deps.add(pred);
63        }
64        Expr ifTrueExpr = getIfTrue();
65        if (ifTrueExpr.isDynamic()) {
66            deps.add(new Dependency(this, ifTrueExpr, predExpr, true));
67        }
68        Expr ifFalseExpr = getIfFalse();
69        if (ifFalseExpr.isDynamic()) {
70            deps.add(new Dependency(this, ifFalseExpr, predExpr, false));
71        }
72        return deps;
73    }
74
75    @Override
76    protected BitSet getPredicateInvalidFlags() {
77        return getPred().getInvalidFlags();
78    }
79
80    @Override
81    protected KCode generateCode() {
82        return new KCode()
83                .app("", getPred().toCode())
84                .app(" ? ", getIfTrue().toCode())
85                .app(" : ", getIfFalse().toCode());
86
87    }
88
89    @Override
90    public boolean isConditional() {
91        return true;
92    }
93}
94