1 files changed, 97 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/utilities/iterator/UnmodifiableListIterator.java b/src/de/lmu/ifi/dbs/elki/utilities/iterator/UnmodifiableListIterator.java
new file mode 100644
index 00000000..224f95a1
--- /dev/null
+++ b/src/de/lmu/ifi/dbs/elki/utilities/iterator/UnmodifiableListIterator.java
@@ -0,0 +1,97 @@
+package de.lmu.ifi.dbs.elki.utilities.iterator;
+/*
+This file is part of ELKI:
+Environment for Developing KDD-Applications Supported by Index-Structures
+
+Copyright (C) 2011
+Ludwig-Maximilians-Universität München
+Lehr- und Forschungseinheit für Datenbanksysteme
+ELKI Development Team
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+import java.util.ListIterator;
+
+/**
+ * Iterator proxy that does not allow modifications.
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.stereotype decorator
+ * @apiviz.composedOf ListIterator oneway - - decorates
+ * 
+ * @param <T>
+ */
+public final class UnmodifiableListIterator<T> implements ListIterator<T> {
+  /**
+   * Real iterator
+   */
+  private ListIterator<T> inner;
+
+  /**
+   * Constructor.
+   * 
+   * @param inner Real iterator to proxy.
+   */
+  public UnmodifiableListIterator(ListIterator<T> inner) {
+    super();
+    this.inner = inner;
+  }
+
+  @Override
+  public boolean hasNext() {
+    return inner.hasNext();
+  }
+
+  @Override
+  public T next() {
+    return inner.next();
+  }
+
+  @Override
+  public boolean hasPrevious() {
+    return inner.hasPrevious();
+  }
+
+  @Override
+  public T previous() {
+    return inner.previous();
+  }
+
+  @Override
+  public int nextIndex() {
+    return inner.nextIndex();
+  }
+
+  @Override
+  public int previousIndex() {
+    return inner.previousIndex();
+  }
+
+  @Override
+  public void remove() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void add(@SuppressWarnings("unused") T e) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void set(@SuppressWarnings("unused") T e) {
+    throw new UnsupportedOperationException();
+  }
+}
+\ No newline at end of file