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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) 2012
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.ArrayList;
import java.util.List;
import de.lmu.ifi.dbs.elki.utilities.ClassGenericsUtil;
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;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
/**
* Parameter that represents a list of objects (in contrast to a class list parameter, they will be instanced at most once.)
*
* @author Erich Schubert
*
* @param <C> Class type
*/
// TODO: add missing constructors.
public class ObjectListParameter<C> extends ClassListParameter<C> {
/**
* Cache for the generated instances.
*/
private ArrayList<C> instances = null;
/**
* Constructor with optional flag.
*
* @param optionID Option ID
* @param restrictionClass Restriction class
* @param optional optional flag
*/
public ObjectListParameter(OptionID optionID, Class<?> restrictionClass, boolean optional) {
super(optionID, restrictionClass, optional);
}
/**
* Constructor for non-optional.
*
* @param optionID Option ID
* @param restrictionClass Restriction class
*/
public ObjectListParameter(OptionID optionID, Class<?> restrictionClass) {
super(optionID, restrictionClass);
}
/** {@inheritDoc} */
@Override
public String getSyntax() {
return "<object_1|class_1,...,object_n|class_n>";
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
@Override
protected List<Class<? extends C>> parseValue(Object obj) throws ParameterException {
if(obj == null) {
throw new UnspecifiedParameterException("Parameter Error.\n" + "No value for parameter \"" + getName() + "\" " + "given.");
}
if (List.class.isInstance(obj)) {
List<?> l = (List<?>) obj;
ArrayList<C> inst = new ArrayList<C>(l.size());
ArrayList<Class<? extends C>> classes = new ArrayList<Class<? extends C>>(l.size());
for (Object o : l) {
// does the given objects class fit?
if (restrictionClass.isInstance(o)) {
inst.add((C) o);
classes.add((Class<? extends C>) o.getClass());
} else if (o instanceof Class) {
if (restrictionClass.isAssignableFrom((Class<?>)o)) {
inst.add(null);
classes.add((Class<? extends C>) o);
} else {
throw new WrongParameterValueException(this, ((Class<?>)o).getName(), "Given class not a subclass / implementation of " + restrictionClass.getName());
}
} else {
throw new WrongParameterValueException(this, o.getClass().getName(), "Given instance not an implementation of " + restrictionClass.getName());
}
}
this.instances = inst;
return super.parseValue(classes);
}
// Did we get a single instance?
try {
C inst = restrictionClass.cast(obj);
this.instances = new ArrayList<C>(1);
this.instances.add(inst);
return super.parseValue(inst.getClass());
} catch (ClassCastException e) {
// Continue
}
return super.parseValue(obj);
}
/** {@inheritDoc} */
@Override
public List<C> instantiateClasses(Parameterization config) {
if (instances == null) {
// instantiateClasses will descend itself.
instances = new ArrayList<C>(super.instantiateClasses(config));
} else {
Parameterization cfg = null;
for (int i = 0; i < instances.size(); i++) {
if (instances.get(i) == null) {
Class<? extends C> cls = getValue().get(i);
try {
// Descend at most once, and only when needed
if (cfg == null) {
cfg = config.descend(this);
}
C instance = ClassGenericsUtil.tryInstantiate(restrictionClass, cls, cfg);
instances.set(i, instance);
}
catch(Exception e) {
config.reportError(new WrongParameterValueException(this, cls.getName(), e));
}
}
}
}
return new ArrayList<C>(instances);
}
}
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