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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.expression;
import java.util.Iterator;
import org.eclipse.equinox.internal.p2.metadata.expression.*;
import org.eclipse.equinox.internal.p2.ql.MatchIteratorFilter;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
import org.eclipse.equinox.p2.ql.IQLExpression;
/**
* An expression that yields a new collection consisting of all elements of the
* <code>collection</code> for which the <code>filter</code> yields <code>true</code>.
*/
final class Select extends CollectionFilter implements IQLExpression {
Select(Expression collection, LambdaExpression lambda) {
super(collection, lambda);
}
protected Object evaluate(IEvaluationContext context, Iterator<?> itor) {
return evaluateAsIterator(context, itor);
}
protected Iterator<?> evaluateAsIterator(final IEvaluationContext context, Iterator<?> itor) {
return new MatchIteratorFilter<Object>(itor) {
protected boolean isMatch(Object val) {
lambda.getItemVariable().setValue(context, val);
return lambda.evaluate(context) == Boolean.TRUE;
}
};
}
public int getExpressionType() {
return TYPE_SELECT;
}
public String getOperator() {
return IQLConstants.KEYWORD_SELECT;
}
boolean isCollection() {
return true;
}
}
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