Import Upstream version 0.4.0~beta1

1 files changed, 104 insertions, 0 deletions

diff --git a/src/de/lmu/ifi/dbs/elki/utilities/iterator/ReverseListIterator.java b/src/de/lmu/ifi/dbs/elki/utilities/iterator/ReverseListIterator.java
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+++ b/src/de/lmu/ifi/dbs/elki/utilities/iterator/ReverseListIterator.java
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+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.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+
+/**
+ * Reverse iterator for lists.
+ * 
+ * @author Erich Schubert
+ * 
+ * @param <E> Element type
+ */
+public class ReverseListIterator<E> implements Iterator<E>, ListIterator<E> {
+  /**
+   * The actual iterator
+   */
+  final ListIterator<E> iter;
+
+  /**
+   * Constructor.
+   * 
+   * @param iter List iterator
+   */
+  public ReverseListIterator(ListIterator<E> iter) {
+    this.iter = iter;
+  }
+
+  /**
+   * Constructor.
+   * 
+   * @param list Existing list
+   */
+  public ReverseListIterator(List<E> list) {
+    this.iter = list.listIterator(list.size());
+  }
+
+  @Override
+  public boolean hasNext() {
+    return iter.hasPrevious();
+  }
+
+  @Override
+  public E next() {
+    return iter.previous();
+  }
+
+  @Override
+  public void remove() {
+    iter.remove();
+  }
+
+  @Override
+  public boolean hasPrevious() {
+    return iter.hasNext();
+  }
+
+  @Override
+  public E previous() {
+    return iter.next();
+  }
+
+  @Override
+  public int nextIndex() {
+    return iter.previousIndex();
+  }
+
+  @Override
+  public int previousIndex() {
+    return iter.nextIndex();
+  }
+
+  @Override
+  public void set(E e) {
+    iter.set(e);
+  }
+
+  @Override
+  public void add(E e) {
+    iter.add(e);
+  }
+}
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