Copyright (c) 2005, 2008 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2005, 2008 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ltk.internal.core.refactoring.history;

import java.net.URI;

import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileStore;

import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.NullProgressMonitor;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.ltk.core.refactoring.RefactoringDescriptor;
import org.eclipse.ltk.core.refactoring.RefactoringDescriptorProxy;
import org.eclipse.ltk.core.refactoring.history.IRefactoringHistoryListener;
import org.eclipse.ltk.core.refactoring.history.RefactoringHistoryEvent;
import org.eclipse.ltk.internal.core.refactoring.RefactoringCoreMessages;
import org.eclipse.ltk.internal.core.refactoring.RefactoringCorePlugin;

Refactoring history listener which continuously persists the global
refactoring history in the different history locations.
Since:
3.2/**
 * Refactoring history listener which continuously persists the global
 * refactoring history in the different history locations.
 *
 * @since 3.2
 */
public final class RefactoringHistorySerializer implements IRefactoringHistoryListener {

	@Override
	public void historyNotification(final RefactoringHistoryEvent event) {
		Assert.isNotNull(event);
		switch (event.getEventType()) {
			case RefactoringHistoryEvent.ADDED:
			case RefactoringHistoryEvent.PUSHED:
			case RefactoringHistoryEvent.POPPED: {
				final RefactoringDescriptorProxy proxy= event.getDescriptor();
				final long stamp= proxy.getTimeStamp();
				if (stamp >= 0) {
					final String name= proxy.getProject();
					final IFileStore store= EFS.getLocalFileSystem().getStore(RefactoringCorePlugin.getDefault().getStateLocation()).getChild(RefactoringHistoryService.NAME_HISTORY_FOLDER);
					if (name != null && !"".equals(name)) { //$NON-NLS-1$
						final IProject project= ResourcesPlugin.getWorkspace().getRoot().getProject(name);
						if (project.isAccessible()) {
							if (RefactoringHistoryService.hasSharedRefactoringHistory(project)) {
								final URI uri= project.getLocationURI();
								if (uri != null) {
									try {
										processHistoryNotification(EFS.getStore(uri).getChild(RefactoringHistoryService.NAME_HISTORY_FOLDER), event, name);
									} catch (CoreException exception) {
										RefactoringCorePlugin.log(exception);
									} finally {
										try {
											project.refreshLocal(IResource.DEPTH_INFINITE, null);
										} catch (CoreException exception) {
											RefactoringCorePlugin.log(exception);
										}
									}
								}
							} else {
								try {
									processHistoryNotification(store.getChild(name), event, name);
								} catch (CoreException exception) {
									RefactoringCorePlugin.log(exception);
								}
							}
						}
					} else {
						try {
							processHistoryNotification(store.getChild(RefactoringHistoryService.NAME_WORKSPACE_PROJECT), event, name);
						} catch (CoreException exception) {
							RefactoringCorePlugin.log(exception);
						}
					}
				}
			}
		}
	}

	
Processes the history event.
Params:
store – 
           the file store
event – 
           the history event
name – 
           the project name, or null
Throws:
CoreException – 
            if an error occurs/**
	 * Processes the history event.
	 *
	 * @param store
	 *            the file store
	 * @param event
	 *            the history event
	 * @param name
	 *            the project name, or <code>null</code>
	 * @throws CoreException
	 *             if an error occurs
	 */
	private void processHistoryNotification(final IFileStore store, final RefactoringHistoryEvent event, final String name) throws CoreException {
		final RefactoringDescriptorProxy proxy= event.getDescriptor();
		final int type= event.getEventType();
		final RefactoringHistoryManager manager= new RefactoringHistoryManager(store, name);
		final NullProgressMonitor monitor= new NullProgressMonitor();
		if (type == RefactoringHistoryEvent.PUSHED || type == RefactoringHistoryEvent.ADDED) {
			final RefactoringDescriptor descriptor= proxy.requestDescriptor(monitor);
			if (descriptor != null)
				manager.addRefactoringDescriptor(descriptor, type == RefactoringHistoryEvent.ADDED, monitor);
		} else if (type == RefactoringHistoryEvent.POPPED)
			manager.removeRefactoringDescriptors(new RefactoringDescriptorProxy[] { proxy}, monitor, RefactoringCoreMessages.RefactoringHistoryService_updating_history);
	}
}