| /******************************************************************************* |
| * 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.p2.ql.IEvaluationContext; |
| import org.eclipse.equinox.p2.ql.IExpression; |
| |
| /** |
| */ |
| final class Collect extends CollectionFilter { |
| final class CollectIterator implements Iterator { |
| private final IEvaluationContext context; |
| |
| private final IExpression variable; |
| |
| private final Iterator innerIterator; |
| |
| public CollectIterator(IEvaluationContext context, Iterator iterator) { |
| this.context = context; |
| this.variable = lambda.getItemVariable(); |
| this.innerIterator = iterator; |
| } |
| |
| public boolean hasNext() { |
| return innerIterator.hasNext(); |
| } |
| |
| public Object next() { |
| context.setValue(variable, innerIterator.next()); |
| return lambda.evaluate(context); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| Collect(Expression collection, LambdaExpression lambda) { |
| super(collection, lambda); |
| } |
| |
| Object evaluate(IEvaluationContext context, Iterator itor) { |
| return evaluateAsIterator(context, itor); |
| } |
| |
| Iterator evaluateAsIterator(IEvaluationContext context, Iterator itor) { |
| return new CollectIterator(context, itor); |
| } |
| |
| public int getExpressionType() { |
| return TYPE_COLLECT; |
| } |
| |
| String getOperator() { |
| return KEYWORD_COLLECT; |
| } |
| |
| boolean isCollection() { |
| return true; |
| } |
| } |