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package de.lmu.ifi.dbs.elki.result;
/*
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 java.util.ArrayList;
import de.lmu.ifi.dbs.elki.logging.Logging;
import de.lmu.ifi.dbs.elki.utilities.datastructures.hierarchy.HashMapHierarchy;
import de.lmu.ifi.dbs.elki.utilities.datastructures.hierarchy.Hierarchy;
import de.lmu.ifi.dbs.elki.utilities.datastructures.hierarchy.ModifiableHierarchy;
/**
* Class to store a hierarchy of result objects.
*
* @author Erich Schubert
*/
// TODO: add listener merging!
public class ResultHierarchy extends HashMapHierarchy<Result> {
/**
* Logger
*/
private static final Logging LOG = Logging.getLogger(ResultHierarchy.class);
/**
* Holds the listener.
*/
private ArrayList<ResultListener> listenerList = new ArrayList<>();
/**
* Constructor.
*/
public ResultHierarchy() {
super();
}
@Override
public boolean add(Result parent, Result child) {
boolean changed = super.add(parent, child);
if(changed && child instanceof HierarchicalResult) {
HierarchicalResult hr = (HierarchicalResult) child;
ModifiableHierarchy<Result> h = hr.getHierarchy();
// Merge hierarchy
hr.setHierarchy(this);
// Add children of child
for(Hierarchy.Iter<Result> iter = h.iterChildren(hr); iter.valid(); iter.advance()) {
Result desc = iter.get();
this.add(hr, desc);
if(desc instanceof HierarchicalResult) {
((HierarchicalResult) desc).setHierarchy(this);
}
}
}
fireResultAdded(child, parent);
return changed;
}
@Override
public boolean remove(Result parent, Result child) {
boolean changed = super.remove(parent, child);
fireResultRemoved(child, parent);
return changed;
}
/**
* Register a result listener.
*
* @param listener Result listener.
*/
public void addResultListener(ResultListener listener) {
listenerList.add(listener);
}
/**
* Remove a result listener.
*
* @param listener Result listener.
*/
public void removeResultListener(ResultListener listener) {
listenerList.remove(listener);
}
/**
* Signal that a result has changed (public API)
*
* @param res Result that has changed.
*/
public void resultChanged(Result res) {
fireResultChanged(res);
}
/**
* Informs all registered {@link ResultListener} that a new result was added.
*
* @param child New child result added
* @param parent Parent result that was added to
*/
private void fireResultAdded(Result child, Result parent) {
if(LOG.isDebugging()) {
LOG.debug("Result added: " + child + " <- " + parent);
}
for(int i = listenerList.size(); --i >= 0;) {
listenerList.get(i).resultAdded(child, parent);
}
}
/**
* Informs all registered {@link ResultListener} that a result has changed.
*
* @param current Result that has changed
*/
private void fireResultChanged(Result current) {
if(LOG.isDebugging()) {
LOG.debug("Result changed: " + current);
}
for(int i = listenerList.size(); --i >= 0;) {
listenerList.get(i).resultChanged(current);
}
}
/**
* Informs all registered {@link ResultListener} that a new result has been
* removed.
*
* @param child result that has been removed
* @param parent Parent result that has been removed
*/
private void fireResultRemoved(Result child, Result parent) {
if(LOG.isDebugging()) {
LOG.debug("Result removed: " + child + " <- " + parent);
}
for(int i = listenerList.size(); --i >= 0;) {
listenerList.get(i).resultRemoved(child, parent);
}
}
}
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