| /******************************************************************************* |
| * 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.workflowmodel.impl; |
| |
| import net.sf.taverna.t2.workflowmodel.Edit; |
| import net.sf.taverna.t2.workflowmodel.EditException; |
| import net.sf.taverna.t2.workflowmodel.Merge; |
| |
| public abstract class AbstractMergeEdit implements Edit<Merge>{ |
| |
| Merge merge; |
| boolean applied=false; |
| |
| public AbstractMergeEdit(Merge merge) { |
| if (merge==null) throw new RuntimeException("Cannot construct a merge edit with a null merge"); |
| this.merge=merge; |
| } |
| |
| public Merge doEdit() throws EditException { |
| if (applied) throw new EditException("Edit has already been applied!"); |
| if (!(merge instanceof MergeImpl)) throw new EditException("Merge must be an instanceof MergeImpl"); |
| MergeImpl mergeImpl = (MergeImpl)merge; |
| try { |
| synchronized (mergeImpl) { |
| doEditAction(mergeImpl); |
| applied = true; |
| } |
| } catch (EditException ee) { |
| applied = false; |
| throw ee; |
| } |
| |
| return this.merge; |
| } |
| |
| protected abstract void doEditAction(MergeImpl mergeImpl) throws EditException; |
| protected abstract void undoEditAction(MergeImpl mergeImpl); |
| |
| public Object getSubject() { |
| return merge; |
| } |
| |
| public boolean isApplied() { |
| return applied; |
| } |
| |
| public void undo() { |
| if (!applied) { |
| throw new RuntimeException( |
| "Attempt to undo edit that was never applied"); |
| } |
| MergeImpl mergeImpl = (MergeImpl) merge; |
| synchronized (mergeImpl) { |
| undoEditAction(mergeImpl); |
| applied = false; |
| } |
| } |
| |
| } |