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/*******************************************************************************
* Copyright (c) 2009, 2017 Cloudsmith Inc. and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Cloudsmith Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.metadata.expression;
import java.util.*;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
/**
* n-ary <code>intersect</code> operator. The result is the set of elements that were found in all operands.
*/
final class Intersect extends Binary {
Intersect(Expression operand, Expression param) {
super(operand, param);
}
@Override
public Object evaluate(IEvaluationContext context) {
return evaluateAsIterator(context);
}
@Override
public Iterator<?> evaluateAsIterator(IEvaluationContext context) {
Set<?> resultSet = asSet(lhs.evaluate(context), false); // Safe since it will not be modified
Iterator<?> itor = rhs.evaluateAsIterator(context);
Set<Object> retained = new HashSet<>();
while (itor.hasNext()) {
Object value = itor.next();
if (resultSet.contains(value))
retained.add(value);
}
return RepeatableIterator.create(retained);
}
@Override
public int getExpressionType() {
return TYPE_INTERSECT;
}
@Override
public String getOperator() {
return KEYWORD_INTERSECT;
}
@Override
public int getPriority() {
return PRIORITY_COLLECTION;
}
}
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