| /******************************************************************************* |
| * Copyright (C) 2007 The University of Manchester |
| * |
| * Modifications to the initial code base are copyright of their |
| * respective authors, or their employers as appropriate. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public License |
| * as published by the Free Software Foundation; either version 2.1 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| ******************************************************************************/ |
| package net.sf.taverna.t2.workbench.selection.impl; |
| |
| import static net.sf.taverna.t2.workbench.selection.events.DataflowSelectionMessage.Type.ADDED; |
| import static net.sf.taverna.t2.workbench.selection.events.DataflowSelectionMessage.Type.REMOVED; |
| |
| import java.util.Comparator; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.TreeSet; |
| |
| import net.sf.taverna.t2.lang.observer.MultiCaster; |
| import net.sf.taverna.t2.lang.observer.Observer; |
| import net.sf.taverna.t2.workbench.selection.DataflowSelectionModel; |
| import net.sf.taverna.t2.workbench.selection.events.DataflowSelectionMessage; |
| |
| /** |
| * Default implementation of a <code>DataflowSelectionModel</code>. |
| * |
| * @author David Withers |
| */ |
| public class DataflowSelectionModelImpl implements DataflowSelectionModel { |
| private MultiCaster<DataflowSelectionMessage> multiCaster; |
| private Set<Object> selection = new TreeSet<>(new Comparator<Object>() { |
| @Override |
| public int compare(Object o1, Object o2) { |
| if (o1 == o2) |
| return 0; |
| return o1.hashCode() - o2.hashCode(); |
| } |
| }); |
| |
| /** |
| * Constructs a new instance of DataflowSelectionModelImpl. |
| */ |
| public DataflowSelectionModelImpl() { |
| multiCaster = new MultiCaster<>(this); |
| } |
| |
| @Override |
| public void addSelection(Object element) { |
| if (element != null) { |
| if (!selection.contains(element)) { |
| clearSelection(); |
| selection.add(element); |
| multiCaster.notify(new DataflowSelectionMessage(ADDED, element)); |
| } |
| } |
| } |
| |
| @Override |
| public void clearSelection() { |
| for (Object element : new HashSet<>(selection)) |
| removeSelection(element); |
| } |
| |
| @Override |
| public Set<Object> getSelection() { |
| return new HashSet<>(selection); |
| } |
| |
| @Override |
| public void removeSelection(Object element) { |
| if (element != null && selection.remove(element)) |
| multiCaster.notify(new DataflowSelectionMessage(REMOVED, element)); |
| } |
| |
| @Override |
| public void setSelection(Set<Object> elements) { |
| if (elements == null) { |
| clearSelection(); |
| return; |
| } |
| Set<Object> newSelection = new HashSet<>(elements); |
| for (Object element : new HashSet<>(selection)) |
| if (!newSelection.remove(element)) |
| removeSelection(element); |
| for (Object element : newSelection) |
| addSelection(element); |
| } |
| |
| @Override |
| public void addObserver(Observer<DataflowSelectionMessage> observer) { |
| multiCaster.addObserver(observer); |
| } |
| |
| @Override |
| public List<Observer<DataflowSelectionMessage>> getObservers() { |
| return multiCaster.getObservers(); |
| } |
| |
| @Override |
| public void removeObserver(Observer<DataflowSelectionMessage> observer) { |
| multiCaster.removeObserver(observer); |
| } |
| } |