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package de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization;
/*
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.Collection;
import java.util.Vector;
import de.lmu.ifi.dbs.elki.utilities.ClassGenericsUtil;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.InternalParameterizationErrors;
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.constraints.GlobalParameterConstraint;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.Parameter;
import de.lmu.ifi.dbs.elki.utilities.pairs.Pair;
/**
* This configuration can be "rewound" to allow the same values to be consumed
* multiple times, by different classes. This is used in best-effort
* parameterization when some instances might not apply given the actual data,
* e.g. in visualization classes.
*
* @author Erich Schubert
*/
// TODO: Can we merge MergedParameterization and TrackParameters into one?
public class MergedParameterization implements Parameterization {
/**
* The parameterization we get the new values from.
*/
final private Parameterization inner;
/**
* Parameters we used before, but have rewound
*/
final private ListParameterization current;
/**
* Parameters to rewind.
*/
final private java.util.Vector<Pair<OptionID, Object>> used;
/**
* Constructor.
*
* @param child Child parameterization to wrap.
*/
public MergedParameterization(Parameterization child) {
super();
this.inner = child;
this.current = new ListParameterization();
this.used = new java.util.Vector<Pair<OptionID, Object>>();
}
/**
* Constructor for descending
*
* @param inner Child parameterization to use.
* @param current Current parameterization to re-used
* @param used Used parameters list.
*/
private MergedParameterization(Parameterization inner, ListParameterization current, Vector<Pair<OptionID, Object>> used) {
super();
this.inner = inner;
this.current = current;
this.used = used;
}
/**
* Rewind the configuration to the initial situation
*/
public void rewind() {
synchronized(used) {
for(Pair<OptionID, Object> pair : used) {
current.addParameter(pair.first, pair.second);
}
used.removeAllElements();
}
}
@Override
public boolean setValueForOption(Parameter<?, ?> opt) throws ParameterException {
try {
if(current.setValueForOption(opt)) {
used.add(new Pair<OptionID, Object>(opt.getOptionID(), opt.getValue()));
return true;
}
}
catch(ParameterException e) {
current.reportError(e);
}
if(inner.setValueForOption(opt)) {
used.add(new Pair<OptionID, Object>(opt.getOptionID(), opt.getValue()));
return true;
}
used.add(new Pair<OptionID, Object>(opt.getOptionID(), opt.getDefaultValue()));
return false;
}
@Override
public Parameterization descend(Object option) {
// We should descend into current, too - but the API doesn't give us a
// ListParameterization then!
return new MergedParameterization(inner.descend(option), current, used);
}
@Override
public Collection<ParameterException> getErrors() {
return current.getErrors();
}
@Override
public boolean hasErrors() {
return current.hasErrors();
}
@Override
public void reportError(ParameterException e) {
inner.reportError(e);
}
@Override
public boolean grab(Parameter<?, ?> opt) {
try {
if (setValueForOption(opt)) {
return true;
}
// Try default value instead.
if (opt.tryDefaultValue()) {
return true;
}
// No value available.
return false;
}
catch(ParameterException e) {
reportError(e);
return false;
}
}
@Override
public boolean hasUnusedParameters() {
return inner.hasUnusedParameters();
}
@Override
public boolean checkConstraint(GlobalParameterConstraint constraint) {
// TODO: does checkConstraint work here reliably?
return inner.checkConstraint(constraint);
}
@Override
public <C> C tryInstantiate(Class<C> r, Class<?> c) {
try {
return ClassGenericsUtil.tryInstantiate(r, c, this);
}
catch(Exception e) {
reportError(new InternalParameterizationErrors("Error instantiating internal class: "+c.getName(), e));
return null;
}
}
@Override
public <C> C tryInstantiate(Class<C> c) {
try {
return ClassGenericsUtil.tryInstantiate(c, c, this);
}
catch(Exception e) {
reportError(new InternalParameterizationErrors("Error instantiating internal class: "+c.getName(), e));
return null;
}
}
}
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