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/*******************************************************************************
* Copyright (c) 2009 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.ql.expression;
import java.util.Iterator;
import org.eclipse.equinox.internal.provisional.p2.metadata.query.Collector;
import org.eclipse.equinox.internal.provisional.p2.metadata.query.IMatchQuery;
import org.eclipse.equinox.p2.metadata.query.IQuery;
import org.eclipse.equinox.p2.ql.IEvaluationContext;
import org.eclipse.equinox.p2.ql.QLContextQuery;
final class WrappedIQuery extends Function {
public WrappedIQuery(Expression[] operands) {
super(assertLength(operands, 1, 3, KEYWORD_IQUERY));
assertNotBoolean(operands[0], "parameter"); //$NON-NLS-1$
assertNotCollection(operands[0], "parameter"); //$NON-NLS-1$
}
public Object evaluate(IEvaluationContext context) {
Object query = operands[0].evaluate(context);
if (query instanceof IMatchQuery) {
if (operands.length > 2)
throw new IllegalArgumentException("iquery third argument cannot be combined with a match query"); //$NON-NLS-1$
Object value = null;
if (operands.length > 1)
value = operands[1].evaluate(context);
else
value = Variable.ITEM.evaluate(context);
return Boolean.valueOf(((IMatchQuery) query).isMatch(value));
}
if (!(query instanceof IQuery))
throw new IllegalArgumentException("iquery first argument must be an IQuery instance"); //$NON-NLS-1$
Collector collector = null;
if (operands.length == 3) {
Object cobj = operands[2].evaluate(context);
if (cobj instanceof Collector)
collector = (Collector) cobj;
else if (cobj == null)
collector = new Collector();
else
throw new IllegalArgumentException("iquery third argument must be a collector"); //$NON-NLS-1$
}
Iterator iterator = null;
if (operands.length > 1)
iterator = operands[1].evaluateAsIterator(context);
else
iterator = Variable.EVERYTHING.evaluateAsIterator(context);
if (collector == null) {
if (query instanceof QLContextQuery)
return ((QLContextQuery) query).evaluate(iterator);
collector = new Collector();
}
return ((IQuery) query).perform(iterator, collector);
}
String getOperator() {
return KEYWORD_IQUERY;
}
}
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