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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.ql;
import java.util.Iterator;
/**
* A collection filter that yields true if the <code>filter</code> yields true for
* any of the elements of the <code>collection</code>
*/
public final class Exists extends CollectionFilter {
public static final String OPERATOR = "exists"; //$NON-NLS-1$
public Exists(Expression collection, LambdaExpression lambda) {
super(collection, lambda);
}
Object evaluate(ExpressionContext context, VariableScope scope, Iterator itor) {
while (itor.hasNext()) {
scope.setEach(variable, itor.next());
if (lambda.evaluate(context, scope) == Boolean.TRUE)
return Boolean.TRUE;
}
return Boolean.FALSE;
}
String getOperator() {
return OPERATOR;
}
}
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