blob: 67567cdc60354bc51a8e55672adb7623dd965dd6 (
plain) (
blame)
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
|
/*******************************************************************************
* Copyright (c) 2009, 2017 Cloudsmith Inc. 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:
* Cloudsmith Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.metadata.expression;
import java.util.Iterator;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
import org.eclipse.equinox.p2.query.IMatchQuery;
import org.eclipse.equinox.p2.query.IQuery;
public final class WrappedIQuery extends Function {
/**
* <p>The WrappedIQuery constructor takes an array with one or two arguments.
* The first argument must evaluate to an instance of {@link IQuery}. The second
* argument is optional. The following applies:</p><ul>
* <li>If first argument evaluates to an instance of {@link IMatchQuery}, then
* a provided second argument assumed to be the candidate to match. The
* variable <code>this</code> will be used if no second argument is not provided.</li>
* <li>For all other types of queries the second argument must evaluate
* to an iterator. If it is not provided, it defaults to the variable
* <code>everything</code>.
* </ul>
* @param operands
*/
public WrappedIQuery(Expression[] operands) {
super(assertLength(operands, 1, 2, KEYWORD_IQUERY));
}
@Override
@SuppressWarnings("unchecked")
public Object evaluate(IEvaluationContext context) {
Object query = operands[0].evaluate(context);
if (query instanceof IMatchQuery<?>) {
Object value = null;
if (operands.length > 1)
value = operands[1].evaluate(context);
else
value = ExpressionFactory.THIS.evaluate(context);
return Boolean.valueOf(((IMatchQuery<Object>) query).isMatch(value));
}
if (!(query instanceof IQuery<?>))
throw new IllegalArgumentException("iquery first argument must be an IQuery instance"); //$NON-NLS-1$
Iterator<?> iterator = null;
if (operands.length > 1)
iterator = operands[1].evaluateAsIterator(context);
else
iterator = ExpressionFactory.EVERYTHING.evaluateAsIterator(context);
return ((IQuery<Object>) query).perform((Iterator<Object>) iterator);
}
@Override
public String getOperator() {
return KEYWORD_IQUERY;
}
@Override
public boolean isReferenceTo(Variable variable) {
Object firstOp = operands[0];
if (firstOp instanceof Literal) {
Object query = ((Literal) firstOp).value;
return (query instanceof IMatchQuery<?>) ? variable == ExpressionFactory.THIS : variable == ExpressionFactory.EVERYTHING;
}
return false;
}
@Override
int countAccessToEverything() {
return isReferenceTo(ExpressionFactory.EVERYTHING) ? 1 : 0;
}
}
|
