1 files changed, 66 insertions, 0 deletions
diff --git a/elki/src/main/java/de/lmu/ifi/dbs/elki/utilities/datastructures/iterator/ArrayIter.java b/elki/src/main/java/de/lmu/ifi/dbs/elki/utilities/datastructures/iterator/ArrayIter.java
new file mode 100644
index 00000000..d3deb054
--- /dev/null
+++ b/elki/src/main/java/de/lmu/ifi/dbs/elki/utilities/datastructures/iterator/ArrayIter.java
@@ -0,0 +1,66 @@
+package de.lmu.ifi.dbs.elki.utilities.datastructures.iterator;
+
+/*
+ This file is part of ELKI:
+ Environment for Developing KDD-Applications Supported by Index-Structures
+
+ Copyright (C) 2015
+ 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/>.
+ */
+
+/**
+ * Array iterators can also go backwards and seek.
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.excludeSubtypes
+ */
+public interface ArrayIter extends Iter {
+  @Override
+  ArrayIter advance();
+
+  /**
+   * Moves the iterator forward or backward by the given offset.
+   * 
+   * @param count offset to move forward or backwards
+   * @return Iterator
+   */
+  ArrayIter advance(int count);
+
+  /**
+   * Moves the iterator backward to the previous entry.
+   * 
+   * @return Iterator
+   */
+  ArrayIter retract();
+
+  /**
+   * Moves the iterator to the given position
+   * 
+   * @param off Seek offset
+   * @return Iterator
+   */
+  ArrayIter seek(int off);
+
+  /**
+   * Get current iterator offset.
+   * 
+   * @return Iterator position
+   */
+  int getOffset();
+}