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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) 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.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.ParameterException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.WrongParameterValueException;
/**
* Parameter constraint specifying that a parameter list
* is not allowed to have duplicate values.
*
* @author Arthur Zimek
*/
public class ListParameterNoDuplicateValueConstraint<T extends Object> implements ParameterConstraint<List<T>> {
/**
* Constructs a Not-Equal-Value parameter constraint. That is, the
* elements of a list of parameter values are not allowed to have equal
* values.
*
*/
public ListParameterNoDuplicateValueConstraint() {
}
/**
* Checks if the elements of the list of parameter values do have different
* values. If not, a parameter exception is thrown.
*
*/
@Override
public void test(List<T> list) throws ParameterException {
Set<T> values = new HashSet<>();
for(T pv : list) {
if(!values.add(pv)) {
Object[] parametervaluesarr = list.toArray();
throw new WrongParameterValueException("Global Parameter Constraint Error:\n" + "Parameter values must have different values. Current values: " + Arrays.deepToString(parametervaluesarr) + ".\n");
}
}
}
@Override
public String getDescription(String parameterName) {
return "Values for parameter "+parameterName+" must have different values.";
}
}
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