1 files changed, 53 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/query/CollectionResult.java b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/query/CollectionResult.java
new file mode 100644
index 000000000..688fd651d
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/query/CollectionResult.java
@@ -0,0 +1,53 @@
+/*******************************************************************************
+ * Copyright (c) 2010 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.p2.query;
+
+import java.lang.reflect.Array;
+import java.util.*;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.equinox.internal.p2.core.helpers.CollectionUtils;
+
+public class CollectionResult<T> implements IQueryResult<T> {
+	private final Collection<T> collection;
+
+	public CollectionResult(Collection<T> collection) {
+		this.collection = collection == null ? CollectionUtils.<T> emptySet() : collection;
+	}
+
+	public IQueryResult<T> query(IQuery<T> query, IProgressMonitor monitor) {
+		return query.perform(iterator());
+	}
+
+	public boolean isEmpty() {
+		return collection.isEmpty();
+	}
+
+	public Iterator<T> iterator() {
+		return collection.iterator();
+	}
+
+	public T[] toArray(Class<? extends T> clazz) {
+		int size = collection.size();
+		@SuppressWarnings("unchecked")
+		T[] result = (T[]) Array.newInstance(clazz, size);
+		if (size != 0)
+			collection.toArray(result);
+		return result;
+	}
+
+	public Set<T> toSet() {
+		return new HashSet<T>(collection);
+	}
+
+	public Set<T> unmodifiableSet() {
+		return collection instanceof Set<?> ? Collections.<T> unmodifiableSet((Set<T>) collection) : toSet();
+	}
+}