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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) 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 de.lmu.ifi.dbs.elki.math.random.RandomFactory;
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.WrongParameterValueException;
/**
* Parameter for random generators and/or random seeds.
*
* @author Erich Schubert
*/
public class RandomParameter extends AbstractParameter<RandomParameter, RandomFactory> {
/**
* Seed value, if used
*/
Long seed = null;
/**
* Constructor without default.
*
* @param optionID Option ID
*/
public RandomParameter(OptionID optionID) {
super(optionID, RandomFactory.DEFAULT);
}
/**
* Constructor with default value. The default value may be {@code null},
* which means a new random will be generated.
*
* @param optionID Option ID
* @param defaultValue Default value. If {@code null}, a new random object
* will be created.
*/
public RandomParameter(OptionID optionID, RandomFactory defaultValue) {
super(optionID, defaultValue);
}
/**
* Constructor with default seed value.
*
* @param optionID Option ID
* @param seed Default seed.
*/
public RandomParameter(OptionID optionID, long seed) {
super(optionID, true);
this.seed = Long.valueOf(seed);
}
@Override
public String getSyntax() {
return "<long|Random>";
}
@Override
public void setValue(Object obj) throws ParameterException {
// This is a bit hackish. Set both seed and random (via super.setValue())
if (obj instanceof RandomFactory) {
seed = null;
} else if (obj instanceof Long) {
seed = (Long) obj;
obj = RandomFactory.get(seed);
} else if (obj instanceof Number) {
seed = Long.valueOf(((Number) obj).longValue());
obj = RandomFactory.get(seed);
} else if ("global random".equals(obj)) {
obj = RandomFactory.DEFAULT;
} else {
try {
seed = Long.valueOf(obj.toString());
obj = RandomFactory.get(seed);
} catch (NullPointerException e) {
throw new WrongParameterValueException("Wrong parameter format! Parameter \"" + getName() + "\" requires a long seed value or a random generator factory, read: " + obj + "!\n");
} catch (NumberFormatException e) {
throw new WrongParameterValueException("Wrong parameter format! Parameter \"" + getName() + "\" requires a long seed value or a random generator factory, read: " + obj + "!\n");
}
}
super.setValue(obj);
}
@Override
protected RandomFactory parseValue(Object obj) throws ParameterException {
if (obj instanceof RandomFactory) {
return (RandomFactory) obj;
}
if (obj instanceof Long) {
return RandomFactory.get((Long) obj);
}
if (obj instanceof Number) {
return RandomFactory.get(Long.valueOf(((Number) obj).longValue()));
}
try {
return RandomFactory.get(Long.valueOf(obj.toString()));
} catch (NullPointerException e) {
throw new WrongParameterValueException("Wrong parameter format! Parameter \"" + getName() + "\" requires a long seed value or a random generator factory, read: " + obj + "!\n");
} catch (NumberFormatException e) {
throw new WrongParameterValueException("Wrong parameter format! Parameter \"" + getName() + "\" requires a long seed value or a random generator factory, read: " + obj + "!\n");
}
}
@Override
public Object getGivenValue() {
Object r = super.getGivenValue();
if (r != null && seed != null) {
super.givenValue = RandomFactory.get(seed);
r = super.givenValue;
}
return r;
}
@Override
public String getValueAsString() {
return (seed != null) ? seed.toString() : "null";
}
@Override
public String getDefaultValueAsString() {
if (defaultValue == RandomFactory.DEFAULT) {
return "global random";
}
return super.getDefaultValueAsString();
}
}
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