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package de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2013
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.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.OptionID;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.ParameterException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.UnspecifiedParameterException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.WrongParameterValueException;
/**
* Parameter class for a parameter specifying a pattern.
*
* @author Steffi Wanka
* @author Erich Schubert
*/
public class PatternParameter extends AbstractParameter<Pattern> {
/**
* Constructs a pattern parameter with the given optionID, and default value.
*
* @param optionID the unique id of the parameter
* @param defaultValue the default value of the parameter
*/
public PatternParameter(OptionID optionID, Pattern defaultValue) {
super(optionID, defaultValue);
}
/**
* Constructs a pattern parameter with the given optionID, and default value.
*
* @param optionID the unique id of the parameter
* @param defaultValue the default value of the parameter
*/
public PatternParameter(OptionID optionID, String defaultValue) {
super(optionID, Pattern.compile(defaultValue, Pattern.CASE_INSENSITIVE));
}
/**
* Constructs a pattern parameter with the given optionID.
*
* @param optionID the unique id of the parameter
*/
public PatternParameter(OptionID optionID) {
super(optionID);
}
@Override
public String getValueAsString() {
return getValue().toString();
}
@Override
protected Pattern parseValue(Object obj) throws ParameterException {
if(obj == null) {
throw new UnspecifiedParameterException(this);
}
if(obj instanceof Pattern) {
return (Pattern) obj;
}
if(obj instanceof String) {
try {
return Pattern.compile((String) obj, Pattern.CASE_INSENSITIVE);
}
catch(PatternSyntaxException e) {
throw new WrongParameterValueException("Given pattern \"" + obj + "\" for parameter \"" + getName() + "\" is no valid regular expression!");
}
}
throw new WrongParameterValueException("Given pattern \"" + obj + "\" for parameter \"" + getName() + "\" is of unknown type!");
}
/**
* Returns a string representation of the parameter's type.
*
* @return "<pattern>"
*/
@Override
public String getSyntax() {
return "<pattern>";
}
}
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