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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.metadata.expression;
import java.util.Iterator;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
/**
* A collection filter that yields the first element of the <code>collection</code> for which
* the <code>filter</code> yields <code>true</code>
*/
final class First extends CollectionFilter {
First(Expression collection, LambdaExpression lambda) {
super(collection, lambda);
}
protected Object evaluate(IEvaluationContext context, Iterator<?> itor) {
Variable variable = lambda.getItemVariable();
while (itor.hasNext()) {
Object each = itor.next();
variable.setValue(context, each);
if (lambda.evaluate(context) == Boolean.TRUE)
return each;
}
return null;
}
public int getExpressionType() {
return TYPE_FIRST;
}
public String getOperator() {
return KEYWORD_FIRST;
}
}
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