BracketExpr.java revision fead9ca09b117136b35bc5bf137340a754f9eddd 
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 BracketExpr extends Expr {
25
26    public static enum BracketAccessor {
27        ARRAY,
28        LIST,
29        MAP,
30    }
31
32    private BracketAccessor mAccessor;
33
34    BracketExpr(Expr target, Expr arg) {
35        super(target, arg);
36    }
37
38    @Override
39    protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) {
40        ModelClass targetType = getTarget().resolveType(modelAnalyzer);
41        if (targetType.isArray()) {
42            mAccessor = BracketAccessor.ARRAY;
43        } else if (targetType.isList()) {
44            mAccessor = BracketAccessor.LIST;
45        } else if (targetType.isMap()) {
46            mAccessor = BracketAccessor.MAP;
47        } else {
48            throw new IllegalArgumentException("Cannot determine variable type used in [] " +
49                    "expression. Cast the value to List, Map, " +
50                    "or array. Type detected: " + targetType.toJavaCode());
51        }
52        return targetType.getComponentType();
53    }
54
55    @Override
56    protected List<Dependency> constructDependencies() {
57        return constructDynamicChildrenDependencies();
58    }
59
60    protected String computeUniqueKey() {
61        return sUniqueKeyJoiner.join(getTarget().computeUniqueKey(), "$", getArg().computeUniqueKey(), "$");
62    }
63
64    public Expr getTarget() {
65        return getChildren().get(0);
66    }
67
68    public Expr getArg() {
69        return getChildren().get(1);
70    }
71
72    public BracketAccessor getAccessor() {
73        return mAccessor;
74    }
75
76    public boolean argCastsInteger() {
77        return Object.class.equals(getArg().getResolvedType());
78    }
79}
80