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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*******************************************************************************
* Copyright (c) 2016 Tasktop Technologies and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.core.externalization;
import java.util.Collection;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.mylyn.commons.core.StatusHandler;
import org.eclipse.mylyn.internal.tasks.core.AbstractTask;
import org.eclipse.mylyn.internal.tasks.core.AbstractTaskCategory;
import org.eclipse.mylyn.internal.tasks.core.AbstractTaskContainer;
import org.eclipse.mylyn.internal.tasks.core.ITransferList;
import org.eclipse.mylyn.internal.tasks.core.RepositoryModel;
import org.eclipse.mylyn.internal.tasks.core.RepositoryQuery;
import org.eclipse.mylyn.tasks.core.IRepositoryElement;
import org.eclipse.mylyn.tasks.core.IRepositoryManager;
import org.w3c.dom.Document;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.google.common.base.Strings;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
public class SaxTaskListHandler extends DefaultHandler {
private final ITransferList taskList;
private final RepositoryModel repositoryModel;
private final IRepositoryManager repositoryManager;
private final Multimap<AbstractTask, String> subTasks;
private final Multimap<RepositoryQuery, String> queryResults;
private final Multimap<AbstractTaskCategory, String> categorizedTasks;
private SaxTaskListElementBuilder<? extends IRepositoryElement> currentBuilder;
private final SaxOrphanBuilder orphanBuilder;
public SaxTaskListHandler(ITransferList taskList, RepositoryModel repositoryModel,
IRepositoryManager repositoryManager) throws CoreException {
this.taskList = taskList;
this.repositoryModel = repositoryModel;
this.repositoryManager = repositoryManager;
this.subTasks = HashMultimap.create();
this.queryResults = HashMultimap.create();
this.categorizedTasks = HashMultimap.create();
this.orphanBuilder = new SaxOrphanBuilder();
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
switch (localName) {
case TaskListExternalizationConstants.NODE_TASK:
checkState(currentBuilder == null, "Cannot begin reading a task while reading another task list element."); //$NON-NLS-1$
currentBuilder = new SaxTaskBuilder(repositoryModel, repositoryManager);
currentBuilder.beginItem(attributes);
break;
case TaskListExternalizationConstants.NODE_QUERY:
checkState(currentBuilder == null, "Cannot begin reading a query while reading another task list element."); //$NON-NLS-1$
currentBuilder = new SaxQueryBuilder(repositoryModel, repositoryManager);
currentBuilder.beginItem(attributes);
break;
case TaskListExternalizationConstants.NODE_CATEGORY:
checkState(currentBuilder == null,
"Cannot begin reading a category while reading another task list element."); //$NON-NLS-1$
currentBuilder = new SaxCategoryBuilder(taskList);
currentBuilder.beginItem(attributes);
break;
case TaskListExternalizationConstants.NODE_ATTRIBUTE:
if (isOK(currentBuilder) && !currentBuilder.isAcceptingAttributeValues()) {
currentBuilder.startAttribute(attributes);
}
break;
case TaskListExternalizationConstants.NODE_SUB_TASK:
checkState(currentBuilder instanceof SaxTaskBuilder, "Cannot read a sub task hit unless reading a task"); //$NON-NLS-1$
recordHit(attributes, subTasks, (SaxTaskBuilder) currentBuilder);
break;
case TaskListExternalizationConstants.NODE_QUERY_HIT:
checkState(currentBuilder instanceof SaxQueryBuilder, "Cannot read a query hit unless reading a query"); //$NON-NLS-1$
recordHit(attributes, queryResults, (SaxQueryBuilder) currentBuilder);
break;
case TaskListExternalizationConstants.NODE_TASK_REFERENCE:
checkState(currentBuilder instanceof SaxCategoryBuilder,
"Cannot read a category hit unless reading a category"); //$NON-NLS-1$
recordHit(attributes, categorizedTasks, (SaxCategoryBuilder) currentBuilder);
break;
default:
break;
}
// don't attempt to make the root element an orphan
if (!TaskListExternalizationConstants.NODE_TASK_LIST.equals(localName)) {
orphanBuilder.startElement(localName, attributes);
}
}
@Override
public void characters(char ch[], int start, int length) throws SAXException {
if (isOK(currentBuilder) && currentBuilder.isAcceptingAttributeValues()) {
currentBuilder.acceptAttributeValueContent(ch, start, length);
}
orphanBuilder.acceptCharacters(ch, start, length);
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
switch (localName) {
case TaskListExternalizationConstants.NODE_TASK:
case TaskListExternalizationConstants.NODE_QUERY:
case TaskListExternalizationConstants.NODE_CATEGORY:
commitCurrentTopLevelElement();
currentBuilder = null;
break;
case TaskListExternalizationConstants.NODE_ATTRIBUTE:
if (isOK(currentBuilder) && currentBuilder.isAcceptingAttributeValues()) {
currentBuilder.endAttribute();
}
break;
case TaskListExternalizationConstants.NODE_TASK_LIST:
applyContainmentToTaskList(subTasks);
applyContainmentToTaskList(queryResults);
applyContainmentToTaskList(categorizedTasks);
break;
default:
break;
}
orphanBuilder.endElement();
}
private <T extends IRepositoryElement> void recordHit(Attributes attributes, Multimap<T, String> hitMap,
SaxTaskListElementBuilder<T> builder) {
String handle = attributes.getValue(TaskListExternalizationConstants.KEY_HANDLE);
if (!Strings.isNullOrEmpty(handle) && isOK(builder)) {
hitMap.put(builder.getItem(), handle);
}
}
private void commitCurrentTopLevelElement() throws SAXException {
checkState(currentBuilder != null,
"Cannot finish reading a task list element without a corresponding builder."); //$NON-NLS-1$
if (isOK(currentBuilder)) {
currentBuilder.addToTaskList(taskList);
} else {
if (!currentBuilder.getErrors().isOK()) {
StatusHandler.log(currentBuilder.getErrors());
}
orphanBuilder.commitOrphan();
}
}
private <T extends AbstractTaskContainer> void applyContainmentToTaskList(Multimap<T, String> containment) {
for (T container : containment.keySet()) {
Collection<String> handles = containment.get(container);
for (String handle : handles) {
AbstractTask subTask = taskList.getTask(handle);
if (subTask != null) {
taskList.addTask(subTask, container);
}
}
}
}
private boolean isOK(SaxTaskListElementBuilder<?> builder) {
return builder != null && builder.getErrors().isOK() && builder.getItem() != null;
}
public Document getOrphans() {
return orphanBuilder.getOrphans();
}
private void checkState(boolean condition, String message) throws SAXException {
if (!condition) {
throw new SAXException(message);
}
}
}
|
