1 files changed, 57 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/query/IQueryResult.java b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/query/IQueryResult.java
new file mode 100644
index 000000000..12e0cbf1c
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/query/IQueryResult.java
@@ -0,0 +1,57 @@
+/******************************************************************************* 
+* Copyright (c) 2009 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> {
+	/**
+	 * 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.
+	 */
+	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 supertype of the runtime type of every collected object
+	 */
+	public T[] toArray(Class<? extends 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> unmodifiableSet();
+}