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/*******************************************************************************
* Copyright (c) 2009, 2017 EclipseSource 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:
* EclipseSource - initial API and implementation
******************************************************************************/
package org.eclipse.equinox.p2.query;
import java.util.Iterator;
import java.util.Set;
/**
* An IQueryResult represents the results of a query.
*
* @since 2.0
*/
public interface IQueryResult<T> extends IQueryable<T>, Iterable<T> {
/**
* Returns whether this QueryResult is empty.
* @return <code>true</code> if this QueryResult has accepted any results,
* and <code>false</code> otherwise.
*/
public boolean isEmpty();
/**
* Returns an iterator on the collected objects.
*
* @return an iterator of the collected objects.
*/
@Override
public Iterator<T> iterator();
/**
* Returns the collected objects as an array
*
* @param clazz The type of array to return
* @return The array of results
* @throws ArrayStoreException the runtime type of the specified array is
* not a super-type of the runtime type of every collected object
*/
public T[] toArray(Class<T> clazz);
/**
* Creates a new Set copy with the contents of this query result. The
* copy can be altered without any side effects on its origin.
* @return A detached copy of the result.
*/
public Set<T> toSet();
/**
* Returns a Set backed by this query result. The set is immutable.
* @return A Set backed by this query result.
*/
public Set<T> toUnmodifiableSet();
}
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