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package de.lmu.ifi.dbs.elki.algorithm;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
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.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import de.lmu.ifi.dbs.elki.data.type.TypeInformation;
import de.lmu.ifi.dbs.elki.database.Database;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.distance.distancefunction.DistanceFunction;
import de.lmu.ifi.dbs.elki.logging.Logging;
import de.lmu.ifi.dbs.elki.result.Result;
import de.lmu.ifi.dbs.elki.utilities.exceptions.APIViolationException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.ObjectParameter;
/**
* <p>
* This class serves also as a model of implementing an algorithm within this
* framework. Any Algorithm that makes use of these flags may extend this class.
* </p>
*
* @author Arthur Zimek
*
* @apiviz.landmark
* @apiviz.excludeSubtypes
*
* @param <R> the result type
*/
public abstract class AbstractAlgorithm<R extends Result> implements Algorithm {
/**
* Constructor.
*/
protected AbstractAlgorithm() {
super();
}
@SuppressWarnings("unchecked")
@Override
public R run(Database database) {
final Object[] relations1;
final Class<?>[] signature1;
final Object[] relations2;
final Class<?>[] signature2;
// Build candidate method signatures
{
final TypeInformation[] inputs = getInputTypeRestriction();
relations1 = new Object[inputs.length + 1];
signature1 = new Class<?>[inputs.length + 1];
relations2 = new Object[inputs.length];
signature2 = new Class<?>[inputs.length];
// First parameter is the database
relations1[0] = database;
signature1[0] = Database.class;
// Other parameters are the bound relations
for(int i = 0; i < inputs.length; i++) {
// TODO: don't bind the same relation twice?
// But sometimes this is wanted (e.g. using projected distances)
relations1[i + 1] = database.getRelation(inputs[i]);
signature1[i + 1] = Relation.class;
relations2[i] = database.getRelation(inputs[i]);
signature2[i] = Relation.class;
}
}
// Find appropriate run method.
Method runmethod1 = null;
Method runmethod2 = null;
try {
runmethod1 = this.getClass().getMethod("run", signature1);
runmethod2 = null;
}
catch(SecurityException e) {
throw new APIViolationException("Security exception finding an appropriate 'run' method.", e);
}
catch(NoSuchMethodException e) {
runmethod1 = null;
// Try without "database" parameter.
try {
runmethod2 = this.getClass().getMethod("run", signature2);
}
catch(NoSuchMethodException e2) {
runmethod2 = null;
}
catch(SecurityException e2) {
throw new APIViolationException("Security exception finding an appropriate 'run' method.", e2);
}
}
if(runmethod1 != null) {
try {
StringBuffer buf = new StringBuffer();
for(Class<?> cls : signature1) {
buf.append(cls.toString()).append(",");
}
return (R) runmethod1.invoke(this, relations1);
}
catch(IllegalArgumentException e) {
throw new APIViolationException("Invoking the real 'run' method failed.", e);
}
catch(IllegalAccessException e) {
throw new APIViolationException("Invoking the real 'run' method failed.", e);
}
catch(InvocationTargetException e) {
if(e.getTargetException() instanceof RuntimeException) {
throw (RuntimeException) e.getTargetException();
}
throw new APIViolationException("Invoking the real 'run' method failed: " + e.getTargetException().toString(), e.getTargetException());
}
}
else if(runmethod2 != null) {
try {
StringBuffer buf = new StringBuffer();
for(Class<?> cls : signature1) {
buf.append(cls.toString()).append(",");
}
return (R) runmethod2.invoke(this, relations2);
}
catch(IllegalArgumentException e) {
throw new APIViolationException("Invoking the real 'run' method failed.", e);
}
catch(IllegalAccessException e) {
throw new APIViolationException("Invoking the real 'run' method failed.", e);
}
catch(InvocationTargetException e) {
if(e.getTargetException() instanceof RuntimeException) {
throw (RuntimeException) e.getTargetException();
}
throw new APIViolationException("Invoking the real 'run' method failed: " + e.getTargetException().toString(), e.getTargetException());
}
}
else {
throw new APIViolationException("No appropriate 'run' method found.");
}
}
/**
* Get the input type restriction used for negotiating the data query.
*
* @return Type restriction
*/
@Override
public abstract TypeInformation[] getInputTypeRestriction();
/**
* Get the (STATIC) logger for this class.
*
* @return the static logger
*/
abstract protected Logging getLogger();
/**
* Make a default distance function configuration option
*
* @param <F> Distance function type
* @param defaultDistanceFunction Default value
* @param restriction Restriction class
* @return Parameter object
*/
public static <F extends DistanceFunction<?, ?>> ObjectParameter<F> makeParameterDistanceFunction(Class<?> defaultDistanceFunction, Class<?> restriction) {
return new ObjectParameter<F>(AbstractDistanceBasedAlgorithm.DISTANCE_FUNCTION_ID, restriction, defaultDistanceFunction);
}
}
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