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/*******************************************************************************
* Copyright (c) 2009, 2010 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.metadata.expression.IExpression;
/**
*/
final class Collect extends CollectionFilter {
final class CollectIterator implements Iterator<Object> {
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);
}
public Object evaluate(IEvaluationContext context, Iterator<?> itor) {
return evaluateAsIterator(context, itor);
}
public Iterator<?> evaluateAsIterator(IEvaluationContext context, Iterator<?> itor) {
return new CollectIterator(context, itor);
}
public int getExpressionType() {
return TYPE_COLLECT;
}
public String getOperator() {
return KEYWORD_COLLECT;
}
}
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