1 files changed, 76 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/FilteredDistanceResultAdapter.java b/src/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/FilteredDistanceResultAdapter.java
new file mode 100644
index 00000000..9a8a2ddc
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+++ b/src/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/FilteredDistanceResultAdapter.java
@@ -0,0 +1,76 @@
+package de.lmu.ifi.dbs.elki.evaluation.scores.adapter;
+
+/*
+ This file is part of ELKI:
+ Environment for Developing KDD-Applications Supported by Index-Structures
+
+ Copyright (C) 2014
+ 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.DBIDRef;
+import de.lmu.ifi.dbs.elki.database.ids.DBIDUtil;
+import de.lmu.ifi.dbs.elki.database.ids.DoubleDBIDListIter;
+
+/**
+ * This adapter is used to process a list of (double, DBID) objects, but allows
+ * skipping one object in the ranking. The list <em>must</em> be sorted
+ * appropriately, the score is only used to detect ties.
+ * 
+ * @author Erich Schubert
+ */
+public class FilteredDistanceResultAdapter extends DistanceResultAdapter {
+  /**
+   * DBID to skip (usually: query object).
+   */
+  DBIDRef skip;
+
+  /**
+   * Constructor
+   * 
+   * @param iter Iterator for distance results
+   * @param skip DBID to skip (reference must remain stable!)
+   */
+  public FilteredDistanceResultAdapter(DoubleDBIDListIter iter, DBIDRef skip) {
+    super(iter);
+    this.skip = skip;
+    if(iter.valid() && DBIDUtil.equal(iter, skip)) {
+      iter.advance();
+    }
+  }
+
+  @Override
+  public DistanceResultAdapter advance() {
+    super.advance();
+    if(iter.valid() && DBIDUtil.equal(iter, skip)) {
+      iter.advance();
+    }
+    return this;
+  }
+
+  @Deprecated
+  @Override
+  public int hashCode() {
+    return super.hashCode();
+  }
+
+  @Deprecated
+  @Override
+  public boolean equals(Object obj) {
+    return super.equals(obj);
+  }
+}
+\ No newline at end of file