TwoWayListenerExpr.java revision d3f2b9229472c9dae9bf4ae8b3e2d653b5653b01 
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 */
16package android.databinding.tool.expr;
17
18import android.databinding.InverseBindingListener;
19import android.databinding.tool.InverseBinding;
20import android.databinding.tool.reflection.ModelAnalyzer;
21import android.databinding.tool.reflection.ModelClass;
22import android.databinding.tool.writer.KCode;
23import android.databinding.tool.writer.LayoutBinderWriterKt;
24
25import java.util.List;
26
27/**
28 * TwoWayListenerExpr is used to set the event listener for a two-way binding expression.
29 */
30public class TwoWayListenerExpr extends Expr {
31    final InverseBinding mInverseBinding;
32
33    public TwoWayListenerExpr(InverseBinding inverseBinding) {
34        mInverseBinding = inverseBinding;
35    }
36
37    @Override
38    protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) {
39        return modelAnalyzer.findClass(InverseBindingListener.class);
40    }
41
42    @Override
43    protected List<Dependency> constructDependencies() {
44        return constructDynamicChildrenDependencies();
45    }
46
47    @Override
48    protected KCode generateCode(boolean expand) {
49        final String fieldName = LayoutBinderWriterKt.getFieldName(mInverseBinding);
50        return new KCode(fieldName);
51    }
52
53    @Override
54    protected String computeUniqueKey() {
55        return "event(" + mInverseBinding.getEventAttribute() + ", " +
56                System.identityHashCode(mInverseBinding) + ")";
57    }
58
59    @Override
60    public String getInvertibleError() {
61        return "Inverted expressions are already inverted!";
62    }
63}
64