Import Upstream version 0.7.0

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diff --git a/elki/src/main/java/de/lmu/ifi/dbs/elki/result/textwriter/TextWriterWriterInterface.java b/elki/src/main/java/de/lmu/ifi/dbs/elki/result/textwriter/TextWriterWriterInterface.java
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+++ b/elki/src/main/java/de/lmu/ifi/dbs/elki/result/textwriter/TextWriterWriterInterface.java
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+package de.lmu.ifi.dbs.elki.result.textwriter;
+
+/*
+ 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 java.io.IOException;
+
+import de.lmu.ifi.dbs.elki.utilities.exceptions.UnableToComplyException;
+
+/**
+ * Base class for object writers.
+ * 
+ * @author Erich Schubert
+ *
+ * @param <O> Object type (usually the class itself)
+ */
+public abstract class TextWriterWriterInterface<O> {
+  /**
+   * Write a given object to the output stream.
+   * 
+   * @param out Output stream
+   * @param label Label to prefix
+   * @param object object to output
+   * @throws UnableToComplyException on errors
+   * @throws IOException on IO errors
+   */
+  public abstract void write(TextWriterStream out, String label, O object) throws UnableToComplyException, IOException;
+  
+  /**
+   * Non-type-checking version.
+   * 
+   * @param out Output stream
+   * @param label Label to prefix
+   * @param object object to output
+   * @throws UnableToComplyException on errors
+   * @throws IOException on IO errors
+   */
+  @SuppressWarnings("unchecked")
+  public final void writeObject(TextWriterStream out, String label, Object object) throws UnableToComplyException, IOException {
+    write(out, label, (O) object);
+  }
+}
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