1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.data.provider;
import java.util.Comparator;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Stream;
import com.vaadin.data.TreeData;
import com.vaadin.server.SerializableComparator;
import com.vaadin.server.SerializableFunction;
import com.vaadin.server.SerializablePredicate;
/**
* {@link HierarchicalDataProvider} wrapper for {@link TreeData}.
*
* @author Vaadin Ltd
* @since 8.1
*
* @param <T>
* data type
*/
public class TreeDataProvider<T>
extends AbstractHierarchicalDataProvider<T, SerializablePredicate<T>>
implements InMemoryDataProvider<T> {
private final TreeData<T> treeData;
private SerializablePredicate<T> filter = null;
private SerializableComparator<T> sortOrder = null;
/**
* Constructs a new TreeDataProvider.
* <p>
* All changes made to the given {@link TreeData} object will also be
* visible through this data provider.
*
* @param treeData
* the backing {@link TreeData} for this provider, not
* {@code null}
*/
public TreeDataProvider(TreeData<T> treeData) {
Objects.requireNonNull(treeData, "treeData cannot be null");
this.treeData = treeData;
}
/**
* Return the underlying hierarchical data of this provider.
*
* @return the underlying data of this provider
*/
public TreeData<T> getTreeData() {
return treeData;
}
@Override
public boolean hasChildren(T item) {
if (!treeData.contains(item)) {
throw new IllegalArgumentException("Item " + item
+ " could not be found in the backing TreeData. "
+ "Did you forget to refresh this data provider after item removal?");
}
return !treeData.getChildren(item).isEmpty();
}
@Override
public int getChildCount(
HierarchicalQuery<T, SerializablePredicate<T>> query) {
return (int) fetchChildren(query).count();
}
@Override
public Stream<T> fetchChildren(
HierarchicalQuery<T, SerializablePredicate<T>> query) {
if (!treeData.contains(query.getParent())) {
throw new IllegalArgumentException("The queried item "
+ query.getParent()
+ " could not be found in the backing TreeData. "
+ "Did you forget to refresh this data provider after item removal?");
}
Stream<T> childStream = getFilteredStream(
treeData.getChildren(query.getParent()).stream(),
query.getFilter());
Optional<Comparator<T>> comparing = Stream
.of(query.getInMemorySorting(), sortOrder)
.filter(c -> c != null)
.reduce((c1, c2) -> c1.thenComparing(c2));
if (comparing.isPresent()) {
childStream = childStream.sorted(comparing.get());
}
return childStream.skip(query.getOffset()).limit(query.getLimit());
}
@Override
public SerializablePredicate<T> getFilter() {
return filter;
}
@Override
public void setFilter(SerializablePredicate<T> filter) {
this.filter = filter;
refreshAll();
}
@Override
public SerializableComparator<T> getSortComparator() {
return sortOrder;
}
@Override
public void setSortComparator(SerializableComparator<T> comparator) {
sortOrder = comparator;
refreshAll();
}
@Override
public <C> DataProvider<T, C> withConvertedFilter(
SerializableFunction<C, SerializablePredicate<T>> filterConverter) {
Objects.requireNonNull(filterConverter,
"Filter converter can't be null");
return new DataProviderWrapper<T, C, SerializablePredicate<T>>(this) {
@Override
protected SerializablePredicate<T> getFilter(Query<T, C> query) {
return query.getFilter().map(filterConverter).orElse(null);
}
@Override
public int size(Query<T, C> t) {
if (t instanceof HierarchicalQuery<?, ?>) {
return dataProvider.size(new HierarchicalQuery<>(
t.getOffset(), t.getLimit(), t.getSortOrders(),
t.getInMemorySorting(), getFilter(t),
((HierarchicalQuery<T, C>) t).getParent()));
}
throw new IllegalArgumentException(
"Hierarchical data provider doesn't support non-hierarchical queries");
}
@Override
public Stream<T> fetch(Query<T, C> t) {
if (t instanceof HierarchicalQuery<?, ?>) {
return dataProvider.fetch(new HierarchicalQuery<>(
t.getOffset(), t.getLimit(), t.getSortOrders(),
t.getInMemorySorting(), getFilter(t),
((HierarchicalQuery<T, C>) t).getParent()));
}
throw new IllegalArgumentException(
"Hierarchical data provider doesn't support non-hierarchical queries");
}
};
}
private Stream<T> getFilteredStream(Stream<T> stream,
Optional<SerializablePredicate<T>> queryFilter) {
if (filter != null) {
stream = stream.filter(filter);
}
return queryFilter.map(stream::filter).orElse(stream);
}
}
|
