/*******************************************************************************
* Copyright (c) 2004, 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 - Initial API and implementation
*******************************************************************************/
package org.eclipse.core.resources.refresh;
import org.eclipse.core.internal.refresh.InternalRefreshProvider;
import org.eclipse.core.resources.IResource;
/**
* The abstract base class for all auto-refresh providers. This class provides the infrastructure
* for defining an auto-refresh provider and fulfills the contract specified by the
* <code>org.eclipse.core.resources.refreshProviders</code> standard extension point.
* <p>
* All auto-refresh providers must subclass this class. A <code>RefreshProvider</code> is
* responsible for creating <code>IRefreshMonitor</code> objects. The provider must decide if it is
* capable of monitoring the file, or folder and subtree under the path that is provided.
*
* @since 3.0
*/
public abstract class RefreshProvider extends InternalRefreshProvider {
/**
* Creates a new refresh monitor that performs naive polling of the resource in the file system
* to detect changes. The returned monitor will immediately begin monitoring the specified
* resource root and report changes back to the workspace.
* <p>
* This default monitor can be returned by subclasses when <code>installMonitor</code> is
* called.
* <p>
* If the returned monitor is not immediately returned from the <code>installMonitor</code>
* method, then clients are responsible for telling the returned monitor to stop polling when it
* is no longer needed. The returned monitor can be told to stop working by invoking
* <code>IRefreshMonitor.unmonitor(IResource)</code>.
*
* @param resource The resource to begin monitoring
* @return A refresh monitor instance
* @see #installMonitor(IResource, IRefreshResult)
*/
protected IRefreshMonitor createPollingMonitor(IResource resource) {
return super.createPollingMonitor(resource);
}
/**
* Returns an <code>IRefreshMonitor</code> that will monitor a resource. If the resource is an
* <code>IContainer</code> the monitor will also monitor the subtree under the container.
* Returns <code>null</code> if this provider cannot create a monitor for the given resource.
* The provider may return the same monitor instance that has been provided for other resources.
* <p>
* The monitor should send results and failures to the provided refresh result.
*
* @param resource the resource to monitor
* @param result the result callback for notifying of failure or of resources that need
* refreshing
* @return a monitor on the resource, or <code>null</code> if the resource cannot be monitored
* @see #createPollingMonitor(IResource)
*/
public abstract IRefreshMonitor installMonitor(IResource resource, IRefreshResult result);
/**
* Resets the installed monitors for the given resource. This will remove all existing monitors
* that are installed on the resource, and then ask all refresh providers to begin monitoring
* the resource again.
* <p>
* This method is intended to be used by refresh providers that need to change the refresh
* monitor that they previously used to monitor a resource.
*
* @param resource The resource to reset the monitors for
*/
public void resetMonitors(IResource resource) {
super.resetMonitors(resource);
}
}