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
|
/*******************************************************************************
* Copyright (c) 2009, 2010 EclipseSource 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:
* EclipseSource - initial API and implementation
******************************************************************************/
package org.eclipse.equinox.p2.query;
import java.util.*;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.equinox.internal.p2.core.helpers.CollectionUtils;
import org.eclipse.equinox.internal.p2.metadata.InstallableUnit;
import org.eclipse.equinox.internal.p2.metadata.expression.CompoundIterator;
import org.eclipse.equinox.internal.p2.metadata.index.CompoundIndex;
import org.eclipse.equinox.internal.p2.metadata.index.IndexProvider;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
import org.eclipse.equinox.p2.metadata.KeyWithLocale;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
import org.eclipse.equinox.p2.metadata.expression.IExpression;
import org.eclipse.equinox.p2.metadata.index.IIndex;
import org.eclipse.equinox.p2.metadata.index.IIndexProvider;
/**
* A queryable that holds a number of other IQueryables and provides
* a mechanism for querying the entire set.
* @since 2.0
*/
public class CompoundQueryable<T> extends IndexProvider<T> {
static class PassThroughIndex<T> implements IIndex<T> {
private final Iterator<T> iterator;
public PassThroughIndex(Iterator<T> iterator) {
this.iterator = iterator;
}
public Iterator<T> getCandidates(IEvaluationContext ctx, IExpression variable, IExpression booleanExpr) {
return iterator;
}
}
private IQueryable<T>[] queryables;
private CompoundQueryable(IQueryable<T>[] queryables) {
this.queryables = queryables;
}
/**
* Creates a queryable that combines the given collection of input queryables
*
* @param queryables The collection of queryables to be combined
*/
@SuppressWarnings("unchecked")
public CompoundQueryable(Collection<? extends IQueryable<T>> queryables) {
this(queryables.toArray(new IQueryable[queryables.size()]));
}
/**
* Creates a queryable that combines the two provided input queryables
*
* @param query1 The first queryable
* @param query2 The second queryable
*/
@SuppressWarnings("unchecked")
public CompoundQueryable(IQueryable<T> query1, IQueryable<T> query2) {
this(new IQueryable[] {query1, query2});
}
/**
* Creates a queryable that combines the three provided input queryables
*
* @param query1 The first queryable
* @param query2 The second queryable
* @param query3 The third queryable
*/
@SuppressWarnings("unchecked")
public CompoundQueryable(IQueryable<T> query1, IQueryable<T> query2, IQueryable<T> query3) {
this(new IQueryable[] {query1, query2, query3});
}
public IIndex<T> getIndex(String memberName) {
// Check that at least one of the queryable can present an index
// for the given member.
boolean found = false;
for (IQueryable<T> queryable : queryables) {
if (queryable instanceof IIndexProvider<?>) {
@SuppressWarnings("unchecked")
IIndexProvider<T> ip = (IIndexProvider<T>) queryable;
if (ip.getIndex(memberName) != null) {
found = true;
break;
}
}
}
if (!found)
// Nobody had an index for this member
return null;
ArrayList<IIndex<T>> indexes = new ArrayList<IIndex<T>>(queryables.length);
for (IQueryable<T> queryable : queryables) {
if (queryable instanceof IIndexProvider<?>) {
@SuppressWarnings("unchecked")
IIndexProvider<T> ip = (IIndexProvider<T>) queryable;
IIndex<T> index = ip.getIndex(memberName);
if (index != null)
indexes.add(index);
else
indexes.add(new PassThroughIndex<T>(ip.everything()));
} else {
indexes.add(new PassThroughIndex<T>(getIteratorFromQueryable(queryable)));
}
}
return indexes.size() == 1 ? indexes.get(0) : new CompoundIndex<T>(indexes);
}
public Iterator<T> everything() {
if (queryables.length == 0)
return CollectionUtils.<T> emptySet().iterator();
if (queryables.length == 1)
return getIteratorFromQueryable(queryables[0]);
ArrayList<Iterator<T>> iterators = new ArrayList<Iterator<T>>(queryables.length);
for (IQueryable<T> queryable : queryables)
iterators.add(getIteratorFromQueryable(queryable));
return new CompoundIterator<T>(iterators.iterator());
}
public Object getManagedProperty(Object client, String memberName, Object key) {
for (IQueryable<T> queryable : queryables) {
if (queryable instanceof IIndexProvider<?>) {
@SuppressWarnings("unchecked")
IIndexProvider<T> ip = (IIndexProvider<T>) queryable;
Object value = ip.getManagedProperty(client, memberName, key);
if (value != null)
return value;
}
}
// When asked for translatedProperties we should return from the IU when the property is not found.
if (client instanceof IInstallableUnit && memberName.equals(InstallableUnit.MEMBER_TRANSLATED_PROPERTIES)) {
IInstallableUnit iu = (IInstallableUnit) client;
return key instanceof KeyWithLocale ? iu.getProperty(((KeyWithLocale) key).getKey()) : iu.getProperty(key.toString());
}
return null;
}
static class IteratorCapture<T> implements IQuery<T> {
private Iterator<T> capturedIterator;
public IQueryResult<T> perform(Iterator<T> iterator) {
capturedIterator = iterator;
return Collector.emptyCollector();
}
public IExpression getExpression() {
return null;
}
Iterator<T> getCapturedIterator() {
return capturedIterator == null ? CollectionUtils.<T> emptySet().iterator() : capturedIterator;
}
}
private static <T> Iterator<T> getIteratorFromQueryable(IQueryable<T> queryable) {
if (queryable instanceof IIndexProvider<?>) {
@SuppressWarnings("unchecked")
IIndexProvider<T> ip = (IIndexProvider<T>) queryable;
return ip.everything();
}
IteratorCapture<T> capture = new IteratorCapture<T>();
queryable.query(capture, new NullProgressMonitor());
return capture.getCapturedIterator();
}
}
|
