| /******************************************************************************* |
| * 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; |
| } |
| } |