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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) 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.utilities.optionhandling.ParameterException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.WrongParameterValueException;
/**
* Length constraint for a
* {@link de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.StringParameter}
* .
*
* @author Erich Schubert
*
* @apiviz.uses de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.StringParameter
*/
public class StringLengthConstraint implements ParameterConstraint<String> {
/**
* Minimum length
*/
int minlength;
/**
* Maximum length
*/
int maxlength;
/**
* Constructor with minimum and maximum length.
*
* @param minlength Minimum length, may be 0 for no limit
* @param maxlength Maximum length, may be -1 for no limit
*/
public StringLengthConstraint(int minlength, int maxlength) {
super();
this.minlength = minlength;
this.maxlength = maxlength;
}
/**
* Checks if the given string value of the string parameter is within the
* length restrictions. If not, a parameter exception is thrown.
*/
@Override
public void test(String t) throws ParameterException {
if(t.length() < minlength) {
throw new WrongParameterValueException("Parameter Constraint Error.\n" + "Parameter value length must be at least " + minlength + ".");
}
if(maxlength > 0 && t.length() > maxlength) {
throw new WrongParameterValueException("Parameter Constraint Error.\n" + "Parameter value length must be at most " + maxlength + ".");
}
}
@Override
public String getDescription(String parameterName) {
if(maxlength > 0) {
return parameterName + " has length " + minlength + " to " + maxlength + ".";
}
else {
return parameterName + " has length of at least " + minlength + ".";
}
}
}
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