1 files changed, 92 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/utilities/optionhandling/constraints/NoDuplicateValueGlobalConstraint.java b/src/de/lmu/ifi/dbs/elki/utilities/optionhandling/constraints/NoDuplicateValueGlobalConstraint.java
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+++ b/src/de/lmu/ifi/dbs/elki/utilities/optionhandling/constraints/NoDuplicateValueGlobalConstraint.java
@@ -0,0 +1,92 @@
+package de.lmu.ifi.dbs.elki.utilities.optionhandling.constraints;
+/*
+This file is part of ELKI:
+Environment for Developing KDD-Applications Supported by Index-Structures
+
+Copyright (C) 2011
+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.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import de.lmu.ifi.dbs.elki.utilities.optionhandling.OptionUtil;
+import de.lmu.ifi.dbs.elki.utilities.optionhandling.ParameterException;
+import de.lmu.ifi.dbs.elki.utilities.optionhandling.WrongParameterValueException;
+import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.NumberParameter;
+import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.Parameter;
+
+/**
+ * Global parameter constraint specifying that parameters of a list of number
+ * parameters ({@link NumberParameter}) are not allowed to have the same value.
+ * 
+ * @author Steffi Wanka
+ */
+public class NoDuplicateValueGlobalConstraint implements GlobalParameterConstraint {
+  /**
+   * List of number parameters to be checked.
+   */
+  private List<? extends Parameter<?, ?>> parameters;
+
+  /**
+   * Constructs a Not-Equal-Value global parameter constraint. That is, the
+   * elements of a list of number parameters are not allowed to have equal
+   * values.
+   * 
+   * @param parameters list of number parameters to be tested
+   */
+  public NoDuplicateValueGlobalConstraint(List<? extends Parameter<?, ?>> parameters) {
+    this.parameters = parameters;
+  }
+
+  /**
+   * Constructs a Not-Equal-Value global parameter constraint. That is, the
+   * elements of a list of number parameters are not allowed to have equal
+   * values.
+   * 
+   * @param parameters list of number parameters to be tested
+   */
+  public NoDuplicateValueGlobalConstraint(Parameter<?, ?>... parameters) {
+    this.parameters = Arrays.asList(parameters);
+  }
+
+  /**
+   * Checks if the elements of the list of number parameters do have different
+   * values. If not, a parameter exception is thrown.
+   * 
+   */
+  @Override
+  public void test() throws ParameterException {
+    Set<Object> numbers = new HashSet<Object>();
+
+    for(Parameter<?, ?> param : parameters) {
+      if(param.isDefined()) {
+        if(!numbers.add(param.getValue())) {
+          throw new WrongParameterValueException("Global Parameter Constraint Error:\n" + "Parameters " + OptionUtil.optionsNamesToString(parameters) + " must have different values. Current values: " + OptionUtil.parameterNamesAndValuesToString(parameters) + ".\n");
+        }
+      }
+    }
+  }
+
+  @Override
+  public String getDescription() {
+    return "Parameters " + OptionUtil.optionsNamesToString(parameters) + " must have different values.";
+  }
+}
+\ No newline at end of file