1 files changed, 69 insertions, 0 deletions
diff --git a/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/iterators/EmptyIterator.java b/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/iterators/EmptyIterator.java
new file mode 100644
index 0000000000..f06e2e03d8
--- /dev/null
+++ b/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/iterators/EmptyIterator.java
@@ -0,0 +1,69 @@
+/*******************************************************************************
+ * Copyright (c) 2005, 2010 Oracle. 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:
+ *     Oracle - initial API and implementation
+ ******************************************************************************/
+package org.eclipse.jpt.common.utility.internal.iterators;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import org.eclipse.jpt.common.utility.internal.StringTools;
+
+/**
+ * An <code>EmptyIterator</code> is just that.
+ * 
+ * @param <E> the type of elements (not) returned by the iterator
+ * 
+ * @see org.eclipse.jpt.common.utility.internal.iterables.EmptyIterable
+ */
+public final class EmptyIterator<E>
+	implements Iterator<E>
+{
+
+	// singleton
+	@SuppressWarnings("rawtypes")
+	private static final EmptyIterator INSTANCE = new EmptyIterator();
+
+	/**
+	 * Return the singleton.
+	 */
+	@SuppressWarnings("unchecked")
+	public static <T> Iterator<T> instance() {
+		return INSTANCE;
+	}
+
+	/**
+	 * Ensure single instance.
+	 */
+	private EmptyIterator() {
+		super();
+	}
+
+	public boolean hasNext() {
+		return false;
+	}
+
+	public E next() {
+		throw new NoSuchElementException();
+	}
+
+	public void remove() {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public String toString() {
+		return StringTools.buildToStringFor(this);
+	}
+
+	private static final long serialVersionUID = 1L;
+	private Object readResolve() {
+		// replace this object with the singleton
+		return INSTANCE;
+	}
+
+}