/*******************************************************************************
* 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;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
/**
* A resource rule factory returns scheduling rules for API methods that modify the workspace. These
* rules can be used when creating jobs or other operations that perform a series of modifications
* on the workspace. This allows clients to implement two phase commit semantics, where all
* necessary rules are obtained prior to executing a long running operation.
* <p>
* Note that simple use of the workspace APIs does not require use of scheduling rules. All
* workspace API methods that modify the workspace will automatically obtain any scheduling rules
* needed to perform the modification. However, if you are aggregating a set of changes to the
* workspace using <code>WorkspaceJob</code> or <code>IWorkspaceRunnable</code> you can use
* scheduling rules to lock a portion of the workspace for the duration of the job or runnable. If
* you provide a non-null scheduling rule, a runtime exception will occur if you try to modify a
* portion of the workspace that is not covered by the rule for the runnable or job.
* <p>
* If more than one rule is needed, they can be aggregated using the <code>MultiRule.combine</code>
* method. Simplifying a group of rules does not change the set of resources that are covered, but
* can improve job scheduling performance.
* <p>
* Note that <code>null</code> is a valid scheduling rule (indicating that no resources need to be
* locked), and thus all methods in this class may return <code>null</code>.
*
* @see WorkspaceJob
* @see IWorkspace#run(IWorkspaceRunnable, ISchedulingRule, int,
* org.eclipse.core.runtime.IProgressMonitor)
* @see org.eclipse.core.runtime.jobs.MultiRule#combine(ISchedulingRule, ISchedulingRule)
* @since 3.0
* @noimplement This interface is not intended to be implemented by clients.
* @noextend This interface is not intended to be extended by clients.
*/
public interface IResourceRuleFactory {
/**
* Returns the scheduling rule that is required for creating a project, folder, or file.
*
* @param resource the resource being created
* @return a scheduling rule, or <code>null</code>
*/
public ISchedulingRule createRule(IResource resource);
/**
* Returns the scheduling rule that is required for building a project or the entire workspace.
*
* @return a scheduling rule, or <code>null</code>
*/
public ISchedulingRule buildRule();
/**
* Returns the scheduling rule that is required for changing the charset setting for a file or
* the default charset setting for a container.
*
* @param resource the resource for which the charset will be changed
* @return a scheduling rule, or <code>null</code>
* @since 3.1
*/
public ISchedulingRule charsetRule(IResource resource);
/**
* Returns the scheduling rule that is required for changing the derived flag on a resource.
*
* @param resource the resource for which the derived flag will be changed
* @return a scheduling rule, or <code>null</code>
* @since 3.6
*/
public ISchedulingRule derivedRule(IResource resource);
/**
* Returns the scheduling rule that is required for copying a resource.
*
* @param source the source of the copy
* @param destination the destination of the copy
* @return a scheduling rule, or <code>null</code>
*/
public ISchedulingRule copyRule(IResource source, IResource destination);
/**
* Returns the scheduling rule that is required for deleting a resource.
*
* @param resource the resource to be deleted
* @return a scheduling rule, or <code>null</code>
*/
public ISchedulingRule deleteRule(IResource resource);
/**
* Returns the scheduling rule that is required for creating, modifying, or deleting markers on
* a resource.
*
* @param resource the resource owning the marker to be modified
* @return a scheduling rule, or <code>null</code>
*/
public ISchedulingRule markerRule(IResource resource);
/**
* Returns the scheduling rule that is required for modifying a resource. For files,
* modification includes setting and appending contents. For projects, modification includes
* opening or closing the project, or setting the project description using the
* {@link IResource#AVOID_NATURE_CONFIG} flag. For all resources <code>touch</code> is
* considered to be a modification.
*
* @param resource the resource being modified
* @return a scheduling rule, or <code>null</code>
*/
public ISchedulingRule modifyRule(IResource resource);
/**
* Returns the scheduling rule that is required for moving a resource.
*
* @param source the source of the move
* @param destination the destination of the move
* @return a scheduling rule, or <code>null</code>
*/
public ISchedulingRule moveRule(IResource source, IResource destination);
/**
* Returns the scheduling rule that is required for performing <code>refreshLocal</code> on a
* resource.
*
* @param resource the resource to refresh
* @return a scheduling rule, or <code>null</code>
*/
public ISchedulingRule refreshRule(IResource resource);
/**
* Returns the scheduling rule that is required for a <code>validateEdit</code>
*
* @param resources the resources to be validated
* @return a scheduling rule, or <code>null</code>
*/
public ISchedulingRule validateEditRule(IResource[] resources);
}