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
|
/*
* Copyright 2000-2013 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;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import com.vaadin.data.Container.Indexed;
import com.vaadin.server.AbstractExtension;
import com.vaadin.shared.data.DataProviderRpc;
import com.vaadin.shared.data.DataProviderState;
import com.vaadin.shared.data.DataRequestRpc;
import com.vaadin.ui.components.grid.Grid;
/**
* Provides Vaadin server-side container data source to a
* {@link com.vaadin.client.ui.grid.GridConnector}. This is currently
* implemented as an Extension hardcoded to support a specific connector type.
* This will be changed once framework support for something more flexible has
* been implemented.
*
* @since 7.2
* @author Vaadin Ltd
*/
public class RpcDataProviderExtension extends AbstractExtension {
private final Indexed container;
/**
* Creates a new data provider using the given container.
*
* @param container
* the container to make available
*/
public RpcDataProviderExtension(Indexed container) {
this.container = container;
// TODO support for reacting to events from the container added later
registerRpc(new DataRequestRpc() {
@Override
public void requestRows(int firstRow, int numberOfRows) {
pushRows(firstRow, numberOfRows);
}
});
getState().containerSize = container.size();
}
private void pushRows(int firstRow, int numberOfRows) {
List<?> itemIds = container.getItemIds(firstRow, numberOfRows);
Collection<?> propertyIds = container.getContainerPropertyIds();
List<String[]> rows = new ArrayList<String[]>(itemIds.size());
for (Object itemId : itemIds) {
rows.add(getRowData(propertyIds, itemId));
}
getRpcProxy(DataProviderRpc.class).setRowData(firstRow, rows);
}
private String[] getRowData(Collection<?> propertyIds, Object itemId) {
Item item = container.getItem(itemId);
String[] row = new String[propertyIds.size()];
int i = 0;
for (Object propertyId : propertyIds) {
Object value = item.getItemProperty(propertyId).getValue();
String stringValue = String.valueOf(value);
row[i++] = stringValue;
}
return row;
}
@Override
protected DataProviderState getState() {
return (DataProviderState) super.getState();
}
/**
* Makes the data source available to the given {@link Grid} component.
*
* @param component
* the remote data grid component to extend
*/
public void extend(Grid component) {
super.extend(component);
}
/**
* Informs the client side that new rows have been inserted into the data
* source.
*
* @param index
* the index at which new rows have been inserted
* @param count
* the number of rows inserted at <code>index</code>
*/
public void insertRowData(int index, int count) {
getState().containerSize += count;
getRpcProxy(DataProviderRpc.class).insertRowData(index, count);
}
/**
* Informs the client side that rows have been removed from the data source.
*
* @param firstIndex
* the index of the first row removed
* @param count
* the number of rows removed
*/
public void removeRowData(int firstIndex, int count) {
getState().containerSize -= count;
getRpcProxy(DataProviderRpc.class).removeRowData(firstIndex, count);
}
/**
* Informs the client side that data of a row has been modified in the data
* source.
*
* @param index
* the index of the row that was updated
*/
public void updateRowData(int index) {
/*
* TODO: ignore duplicate requests for the same index during the same
* roundtrip.
*/
Object itemId = container.getIdByIndex(index);
String[] row = getRowData(container.getContainerPropertyIds(), itemId);
getRpcProxy(DataProviderRpc.class).setRowData(index,
Collections.singletonList(row));
}
}
|
