package de.lmu.ifi.dbs.elki.result;

/*
 This file is part of ELKI:
 Environment for Developing KDD-Applications Supported by Index-Structures

 Copyright (C) 2014
 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 javax.swing.event.EventListenerList;

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 EventListenerList listenerList = new EventListenerList();

  /**
   * 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(ResultListener.class, listener);
  }

  /**
   * Remove a result listener.
   *
   * @param listener Result listener.
   */
  public void removeResultListener(ResultListener listener) {
    listenerList.remove(ResultListener.class, 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(ResultListener l : listenerList.getListeners(ResultListener.class)) {
      l.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(ResultListener l : listenerList.getListeners(ResultListener.class)) {
      l.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(ResultListener l : listenerList.getListeners(ResultListener.class)) {
      l.resultRemoved(child, parent);
    }
  }
}

@@ -159,9 +159,9 @@
  201
-4
+5
 %0A Lu
@@ -934,35 +934,19 @@
 java
-x.swing.event.EventListener
+.util.Array
 List
@@ -1561,20 +1561,31 @@
 private 
-Even
+ArrayList%3CResul
 tListene
@@ -1585,20 +1585,17 @@
 Listener
-List
+%3E
  listene
@@ -1610,25 +1610,19 @@
 new 
-EventListener
+Array
 List
+%3C%3E
 ();%0A
@@ -2763,38 +2763,16 @@
 ist.add(
-ResultListener.class, 
 listener
@@ -2955,30 +2955,8 @@
 ove(
-ResultListener.class, 
 list
@@ -3509,85 +3509,75 @@
 for(
-ResultListener l : listenerList.getListeners(ResultListener.class)) %7B%0A      l
+int i = listenerList.size(); --i %3E= 0;) %7B%0A      listenerList.get(i)
 .res
@@ -3895,85 +3895,75 @@
 for(
-ResultListener l : listenerList.getListeners(ResultListener.class)) %7B%0A      l
+int i = listenerList.size(); --i %3E= 0;) %7B%0A      listenerList.get(i)
 .res
@@ -4378,85 +4378,75 @@
 for(
-ResultListener l : listenerList.getListeners(ResultListener.class)) %7B%0A      l
+int i = listenerList.size(); --i %3E= 0;) %7B%0A      listenerList.get(i)
 .res

Use ArrayList to store listeners.