Import Upstream version 0.7.0

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diff --git a/elki/src/main/java/de/lmu/ifi/dbs/elki/utilities/datastructures/arraylike/ExtendedArray.java b/elki/src/main/java/de/lmu/ifi/dbs/elki/utilities/datastructures/arraylike/ExtendedArray.java
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+++ b/elki/src/main/java/de/lmu/ifi/dbs/elki/utilities/datastructures/arraylike/ExtendedArray.java
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+package de.lmu.ifi.dbs.elki.utilities.datastructures.arraylike;
+
+/*
+ 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/>.
+ */
+
+/**
+ * Class to extend an array with a single element virtually.
+ * 
+ * @author Erich Schubert
+ * 
+ * @param <T> Object type
+ */
+public class ExtendedArray<T> implements ArrayAdapter<T, ExtendedArray<T>> {
+  /**
+   * The array
+   */
+  final Object array;
+
+  /**
+   * The array adapter
+   */
+  final ArrayAdapter<T, Object> getter;
+
+  /**
+   * The extra element
+   */
+  final T extra;
+
+  /**
+   * Our size
+   */
+  final int size;
+
+  /**
+   * Constructor.
+   * 
+   * @param array Original array
+   * @param getter Adapter for array
+   * @param extra Extra element
+   */
+  protected ExtendedArray(Object array, ArrayAdapter<T, Object> getter, T extra) {
+    super();
+    this.array = array;
+    this.getter = getter;
+    this.extra = extra;
+    this.size = getter.size(array) + 1;
+  }
+
+  @Override
+  public int size(ExtendedArray<T> array) {
+    assert (this == array);
+    return size;
+  }
+
+  @Override
+  public T get(ExtendedArray<T> array, int off) throws IndexOutOfBoundsException {
+    assert (this == array);
+    if(off == size - 1) {
+      return extra;
+    }
+    return getter.get(this.array, off);
+  }
+
+  /**
+   * Static wrapper that has a nicer generics signature.
+   * 
+   * @param array Array to extend
+   * @param getter Getter for array
+   * @param extra Extra element
+   * @return Extended array
+   */
+  @SuppressWarnings("unchecked")
+  public static <T, A> ExtendedArray<T> extend(A array, ArrayAdapter<T, A> getter, T extra) {
+    return new ExtendedArray<>(array, (ArrayAdapter<T, Object>) getter, extra);
+  }
+}
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