Import Upstream version 0.6.5~20141030

1 files changed, 127 insertions, 0 deletions

diff --git a/src/de/lmu/ifi/dbs/elki/parallel/processor/DoubleMinMaxProcessor.java b/src/de/lmu/ifi/dbs/elki/parallel/processor/DoubleMinMaxProcessor.java
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+++ b/src/de/lmu/ifi/dbs/elki/parallel/processor/DoubleMinMaxProcessor.java
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+package de.lmu.ifi.dbs.elki.parallel.processor;
+
+/*
+ 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.math.DoubleMinMax;
+import de.lmu.ifi.dbs.elki.parallel.Executor;
+import de.lmu.ifi.dbs.elki.parallel.variables.SharedDouble;
+
+/**
+ * Sink collecting minimum and maximum values.
+ * 
+ * @author Erich Schubert
+ *
+ * @apiviz.has Instance
+ * @apiviz.uses SharedDouble
+ * @apiviz.has DoubleMinMax
+ */
+public class DoubleMinMaxProcessor implements Processor {
+  /**
+   * The central data store.
+   */
+  DoubleMinMax minmax = new DoubleMinMax();
+
+  /**
+   * Input channel
+   */
+  SharedDouble input;
+
+  /**
+   * Constructor.
+   */
+  public DoubleMinMaxProcessor() {
+    super();
+  }
+
+  /**
+   * Connect an input channel.
+   * 
+   * @param input Input channel
+   */
+  public void connectInput(SharedDouble input) {
+    this.input = input;
+  }
+
+  @Override
+  public Instance instantiate(Executor executor) {
+    return new Instance(executor.getInstance(input));
+  }
+
+  @Override
+  public void cleanup(Processor.Instance inst) {
+    merge(((Instance) inst).minmax);
+  }
+
+  /**
+   * Merge the result of an instance.
+   * 
+   * @param minmax Minmax value
+   */
+  protected synchronized void merge(DoubleMinMax minmax) {
+    this.minmax.put(minmax.getMin());
+    this.minmax.put(minmax.getMax());
+  }
+
+  /**
+   * Get the minmax object.
+   * 
+   * @return Minmax object
+   */
+  public DoubleMinMax getMinMax() {
+    return minmax;
+  }
+
+  /**
+   * Instance for a particular sub-channel / part of the data set.
+   * 
+   * @author Erich Schubert
+   */
+  private static class Instance implements Processor.Instance {
+    /**
+     * The central data store.
+     */
+    private DoubleMinMax minmax = new DoubleMinMax();
+
+    /**
+     * Input channel instance
+     */
+    private SharedDouble.Instance input;
+
+    /**
+     * Constructor.
+     * 
+     * @param input Input channel instance.
+     */
+    public Instance(SharedDouble.Instance input) {
+      super();
+      this.input = input;
+    }
+
+    @Override
+    public void map(DBIDRef id) {
+      minmax.put(input.doubleValue());
+    }
+  }
+}