Import Upstream version 0.7.0

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diff --git a/elki/src/main/java/de/lmu/ifi/dbs/elki/database/query/distance/DBIDDistanceQuery.java b/elki/src/main/java/de/lmu/ifi/dbs/elki/database/query/distance/DBIDDistanceQuery.java
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+package de.lmu.ifi.dbs.elki.database.query.distance;
+
+/*
+ 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/>.
+ */
+
+import de.lmu.ifi.dbs.elki.database.ids.DBID;
+import de.lmu.ifi.dbs.elki.database.ids.DBIDRef;
+import de.lmu.ifi.dbs.elki.database.relation.Relation;
+import de.lmu.ifi.dbs.elki.distance.distancefunction.DBIDDistanceFunction;
+
+/**
+ * Run a distance query based on DBIDs
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.landmark
+ * @apiviz.uses DBIDDistanceFunction
+ */
+public class DBIDDistanceQuery extends AbstractDatabaseDistanceQuery<DBID> {
+  /**
+   * The distance function we use.
+   */
+  final protected DBIDDistanceFunction distanceFunction;
+
+  /**
+   * Constructor.
+   * 
+   * @param relation Database to use.
+   * @param distanceFunction Our distance function
+   */
+  public DBIDDistanceQuery(Relation<DBID> relation, DBIDDistanceFunction distanceFunction) {
+    super(relation);
+    this.distanceFunction = distanceFunction;
+  }
+
+  @Override
+  public double distance(DBIDRef id1, DBIDRef id2) {
+    if(id1 == null) {
+      throw new UnsupportedOperationException("This distance function can only be used for objects stored in the database.");
+    }
+    if(id2 == null) {
+      throw new UnsupportedOperationException("This distance function can only be used for objects stored in the database.");
+    }
+    return distanceFunction.distance(id1, id2);
+  }
+
+  @Override
+  public DBIDDistanceFunction getDistanceFunction() {
+    return distanceFunction;
+  }
+}
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