| /******************************************************************************* |
| * Copyright (c) 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.pde.api.tools.internal; |
| |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.eclipse.pde.api.tools.internal.provisional.ISession; |
| import org.eclipse.pde.api.tools.internal.provisional.ISessionListener; |
| import org.eclipse.pde.api.tools.internal.provisional.ISessionManager; |
| |
| /** |
| * Implementation of the ISessionManager. |
| * Synchronize all accesses to prevent concurrent modifications. |
| */ |
| public class SessionManager implements ISessionManager { |
| |
| // use a list so that we can preserve the order |
| private List sessions = new ArrayList(); |
| private Set listeners = new HashSet(); |
| private ISession activeSession; |
| |
| public synchronized void addSession(ISession session, boolean activate) { |
| if (session == null) { |
| throw new IllegalArgumentException("The given session cannot be null"); //$NON-NLS-1$ |
| } |
| if (!this.sessions.contains(session)) { |
| this.sessions.add(session); |
| fireSessionAdded(session); |
| } |
| if (activate) { |
| this.activeSession = session; |
| fireSessionActivated(session); |
| } |
| } |
| |
| public synchronized void removeSession(ISession session) { |
| if (sessions.remove(session)) { |
| if (session.equals(this.activeSession)) { |
| this.activeSession = null; |
| fireSessionActivated(null); |
| } |
| fireSessionRemoved(session); |
| } |
| } |
| |
| public synchronized void removeAllSessions() { |
| ISession[] allSessions = (ISession[]) this.sessions.toArray(new ISession[this.sessions.size()]); |
| this.sessions.clear(); |
| this.activeSession = null; |
| fireSessionActivated(null); |
| for (int i = 0; i < allSessions.length; i++) { |
| ISession session = allSessions[i]; |
| fireSessionRemoved(session); |
| } |
| } |
| |
| public synchronized ISession[] getSessions() { |
| return (ISession[]) sessions.toArray(new ISession[sessions.size()]); |
| } |
| |
| public synchronized void addSessionListener(ISessionListener listener) { |
| if (listener == null) throw new IllegalArgumentException("The given listener cannot be null"); //$NON-NLS-1$ |
| listeners.add(listener); |
| } |
| |
| public synchronized void removeSessionListener(ISessionListener listener) { |
| listeners.remove(listener); |
| } |
| |
| protected synchronized void fireSessionAdded(ISession session) { |
| Iterator i = listeners.iterator(); |
| while (i.hasNext()) { |
| ((ISessionListener) i.next()).sessionAdded(session); |
| } |
| } |
| |
| protected synchronized void fireSessionRemoved(ISession session) { |
| Iterator i = listeners.iterator(); |
| while (i.hasNext()) { |
| ((ISessionListener) i.next()).sessionRemoved(session); |
| } |
| } |
| |
| public ISession getActiveSession() { |
| return this.activeSession; |
| } |
| |
| protected synchronized void fireSessionActivated(ISession session) { |
| Iterator i = listeners.iterator(); |
| while (i.hasNext()) { |
| ((ISessionListener) i.next()).sessionActivated(session); |
| } |
| } |
| |
| public void activateSession(ISession session) { |
| if (this.sessions.contains(session) && !session.equals(this.activeSession)) { |
| this.activeSession = session; |
| fireSessionActivated(session); |
| } |
| } |
| } |