bundles/org.eclipse.wst.sse.core/src-tasktags/org/eclipse/wst/sse/core/internal/tasks/WorkspaceTaskScanner.java - sourceediting/webtools.sourceediting - Git at Google

 /*******************************************************************************
  * Copyright (c) 2001, 2008 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
  *     Jens Lukowski/Innoopract - initial renaming/restructuring
  *
  *******************************************************************************/
 package org.eclipse.wst.sse.core.internal.tasks;

 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;

 import org.eclipse.core.resources.IContainer;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.IResourceDelta;
 import org.eclipse.core.resources.IWorkspace;
 import org.eclipse.core.resources.IWorkspaceRunnable;
 import org.eclipse.core.resources.ProjectScope;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.OperationCanceledException;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.SubProgressMonitor;
 import org.eclipse.core.runtime.content.IContentDescription;
 import org.eclipse.core.runtime.content.IContentType;
 import org.eclipse.core.runtime.content.IContentTypeManager;
 import org.eclipse.core.runtime.preferences.DefaultScope;
 import org.eclipse.core.runtime.preferences.IPreferencesService;
 import org.eclipse.core.runtime.preferences.IScopeContext;
 import org.eclipse.core.runtime.preferences.InstanceScope;
 import org.eclipse.wst.sse.core.internal.Logger;
 import org.eclipse.wst.sse.core.internal.provisional.tasks.IFileTaskScanner;
 import org.eclipse.wst.sse.core.internal.provisional.tasks.TaskTag;
 import org.eclipse.wst.sse.core.utils.StringUtils;

 /**
  * Dispatcher for scanning based on deltas and requested projects
  */
 class WorkspaceTaskScanner {
 	private static WorkspaceTaskScanner _instance = null;

 	static synchronized WorkspaceTaskScanner getInstance() {
 		if (_instance == null) {
 			_instance = new WorkspaceTaskScanner();
 		}
 		return _instance;
 	}

 	final String DEFAULT_MARKER_TYPE = IFileTaskScanner.TASK_MARKER_ID;
 	private List fActiveScanners = null;
 	private IContentType[] fCurrentIgnoreContentTypes = null;
 	private TaskTag[] fCurrentTaskTags = null;

 	private FileTaskScannerRegistryReader registry = null;

 	private long time0;

 	/**
 	 *
 	 */
 	private WorkspaceTaskScanner() {
 		super();
 		registry = FileTaskScannerRegistryReader.getInstance();
 		fActiveScanners = new ArrayList();
 		fCurrentTaskTags = new TaskTag[0];
 		fCurrentIgnoreContentTypes = new IContentType[0];
 	}

 	private IContentType[] detectContentTypes(IResource resource) {
 		IContentType[] types = null;
 		if (resource.getType() == IResource.FILE && resource.isAccessible()) {
 			types = Platform.getContentTypeManager().findContentTypesFor(resource.getName());
 			if (types.length == 0) {
 				IContentDescription d = null;
 				try {
 					// optimized description lookup, might not succeed
 					d = ((IFile) resource).getContentDescription();
 					if (d != null) {
 						types = new IContentType[]{d.getContentType()};
 					}
 				}
 				catch (CoreException e) {
 					/*
 					 * should not be possible given the accessible and file
 					 * type check above
 					 */
 				}
 			}
 			if (types == null) {
 				types = Platform.getContentTypeManager().findContentTypesFor(resource.getName());
 			}
 			if (Logger.DEBUG_TASKSCONTENTTYPE) {
 				if (types.length > 0) {
 					if (types.length > 1) {
 						System.out.println(resource.getFullPath() + ": " + "multiple based on name (probably hierarchical)"); //$NON-NLS-1$ //$NON-NLS-2$
 					}
 					for (int i = 0; i < types.length; i++) {
 						System.out.println(resource.getFullPath() + " matched: " + types[i].getId()); //$NON-NLS-1$
 					}
 				}
 			}
 		}
 		return types;
 	}

 	/**
 	 * @param resource
 	 * @return
 	 */
 	private IProject getProject(IResource resource) {
 		IProject project = null;
 		if (resource.getType() == IResource.PROJECT) {
 			project = (IProject) resource;
 		}
 		else {
 			project = resource.getProject();
 		}
 		return project;
 	}

 	private boolean init(IResource resource) {
 		IProject project = getProject(resource);

 		IPreferencesService preferencesService = Platform.getPreferencesService();
 		IScopeContext[] lookupOrder = new IScopeContext[]{new ProjectScope(project), new InstanceScope(), new DefaultScope()};

 		boolean proceed = preferencesService.getBoolean(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_ENABLE, false, lookupOrder);

 		if (Logger.DEBUG_TASKSPREFS) {
 			System.out.println(getClass().getName() + " scan of " + resource.getFullPath() + ":" + proceed); //$NON-NLS-1$ //$NON-NLS-2$
 		}

 		if (proceed) {
 			String[] tags = StringUtils.unpack(preferencesService.getString(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_TAGS, null, lookupOrder));
 			String[] priorities = StringUtils.unpack(preferencesService.getString(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_PRIORITIES, null, lookupOrder));
 			String[] currentIgnoreContentTypeIDs = StringUtils.unpack(preferencesService.getString(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED, null, lookupOrder));
 			if (Logger.DEBUG_TASKSPREFS) {
 				System.out.print(getClass().getName() + " tags: "); //$NON-NLS-1$
 				for (int i = 0; i < tags.length; i++) {
 					if (i > 0) {
 						System.out.print(","); //$NON-NLS-1$
 					}
 					System.out.print(tags[i]);
 				}
 				System.out.println();
 				System.out.print(getClass().getName() + " priorities: "); //$NON-NLS-1$
 				for (int i = 0; i < priorities.length; i++) {
 					if (i > 0) {
 						System.out.print(","); //$NON-NLS-1$
 					}
 					System.out.print(priorities[i]);
 				}
 				System.out.println();
 				System.out.print(getClass().getName() + " ignored content types: "); //$NON-NLS-1$
 				for (int i = 0; i < currentIgnoreContentTypeIDs.length; i++) {
 					if (i > 0) {
 						System.out.print(","); //$NON-NLS-1$
 					}
 					System.out.print(currentIgnoreContentTypeIDs[i]);
 				}
 				System.out.println();
 			}
 			fCurrentIgnoreContentTypes = new IContentType[currentIgnoreContentTypeIDs.length];
 			IContentTypeManager contentTypeManager = Platform.getContentTypeManager();
 			for (int i = 0; i < currentIgnoreContentTypeIDs.length; i++) {
 				fCurrentIgnoreContentTypes[i] = contentTypeManager.getContentType(currentIgnoreContentTypeIDs[i]);
 			}
 			int max = Math.min(tags.length, priorities.length);
 			fCurrentTaskTags = new TaskTag[max];
 			for (int i = 0; i < max; i++) {
 				int priority = TaskTag.PRIORITY_NORMAL;
 				try {
 					priority = Integer.parseInt(priorities[i]);
 				}
 				catch (NumberFormatException e) {
 					// default to normal priority
 				}
 				fCurrentTaskTags[i] = new TaskTag(tags[i], priority);
 			}
 		}
 		return proceed;
 	}

 	void internalScan(final IProject project, final IResource resource, final IProgressMonitor scanMonitor) {
 		if (scanMonitor.isCanceled())
 			return;
 		try {
 			String name = resource.getName();
 			if (resource.isAccessible() && !resource.isDerived() && !resource.isPhantom() && !resource.isTeamPrivateMember() && name.length() != 0 && name.charAt(0) != '.') {
 				if ((resource.getType() & IResource.FOLDER) > 0 || (resource.getType() & IResource.PROJECT) > 0) {
 					IResource[] children = ((IContainer) resource).members();
 					scanMonitor.beginTask("", children.length); //$NON-NLS-1$
 					for (int i = 0; i < children.length; i++) {
 						internalScan(project, children[i], new SubProgressMonitor(scanMonitor, 1, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));
 					}
 					scanMonitor.done();
 				}
 				else if ((resource.getType() & IResource.FILE) > 0) {
 					scanFile(project, fCurrentTaskTags, (IFile) resource, scanMonitor);
 				}
 			}
 		}
 		catch (CoreException e) {
 			Logger.logException(e);
 		}
 	}

 	void internalScan(IResourceDelta delta, final IProgressMonitor monitor) {
 		if (monitor.isCanceled())
 			return;
 		try {
 			String name = delta.getFullPath().lastSegment();
 			IResource resource = delta.getResource();
 			if (!resource.isDerived() && !resource.isPhantom() && !resource.isTeamPrivateMember() && name.length() != 0 && name.charAt(0) != '.') {
 				if ((resource.getType() & IResource.FOLDER) > 0 || (resource.getType() & IResource.PROJECT) > 0) {
 					IResourceDelta[] children = delta.getAffectedChildren();
 					monitor.beginTask("", children.length);
 					if (name.length() != 0 && name.charAt(0) != '.' && children.length > 0) {
 						for (int i = children.length - 1; i >= 0; i--) {
 							internalScan(children[i], new SubProgressMonitor(monitor, 1, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));
 						}
 					}
 					monitor.done();
 				}
 				else if ((resource.getType() & IResource.FILE) > 0) {
 					if ((delta.getKind() & IResourceDelta.ADDED) > 0 || ((delta.getKind() & IResourceDelta.CHANGED) > 0 && (delta.getFlags() & IResourceDelta.CONTENT) > 0)) {
 						IFile file = (IFile) resource;
 						scanFile(file.getProject(), fCurrentTaskTags, file, monitor);
 					}
 				}
 			}
 		}
 		catch (Exception e) {
 			Logger.logException(e);
 		}
 	}

 	private void replaceTaskMarkers(final IFile file, final String[] markerTypes, final Map markerAttributes[], IProgressMonitor monitor) {
 		final IFile finalFile = file;
 		if (file.isAccessible()) {
 			try {
 				IWorkspaceRunnable r = new IWorkspaceRunnable() {
 					public void run(IProgressMonitor progressMonitor) throws CoreException {
 						try {
 							/*
 							 * Delete old Task markers (don't delete regular
 							 * Tasks since that includes user-defined ones)
 							 */
 							for (int i = 0; i < markerTypes.length; i++) {
 								file.deleteMarkers(markerTypes[i], true, IResource.DEPTH_ZERO);
 							}
 						}
 						catch (CoreException e) {
 							Logger.logException("exception deleting old tasks", e); //$NON-NLS-1$
 						}
 						if (markerAttributes != null && markerAttributes.length > 0) {
 							if (Logger.DEBUG_TASKS) {
 								System.out.println("" + markerAttributes.length + " tasks for " + file.getFullPath()); //$NON-NLS-1$ //$NON-NLS-2$
 							}
 							for (int i = 0; i < markerAttributes.length; i++) {
 								String specifiedMarkerType = (String) markerAttributes[i].get(IMarker.TASK);
 								IMarker marker = finalFile.createMarker(specifiedMarkerType != null ? specifiedMarkerType : DEFAULT_MARKER_TYPE);
 								marker.setAttributes(markerAttributes[i]);
 							}
 						}
 					}
 				};
 				if (file.isAccessible()) {
 					finalFile.getWorkspace().run(r, file, IWorkspace.AVOID_UPDATE, monitor);
 				}
 			}
 			catch (CoreException e1) {
 				Logger.logException(e1);
 			}
 			catch(OperationCanceledException e) {
 				// not an error condition
 			}
 		}
 	}

 	void scan(final IProject project, final IProgressMonitor scanMonitor) {
 		if (scanMonitor.isCanceled())
 			return;
 		if (Logger.DEBUG_TASKS) {
 			System.out.println(getClass().getName() + " scanning project " + project.getName()); //$NON-NLS-1$
 		}
 		if (!project.isAccessible()) {
 			if (Logger.DEBUG_TASKS) {
 				System.out.println(getClass().getName() + " skipping inaccessible project " + project.getName()); //$NON-NLS-1$
 			}
 			return;
 		}

 		if (Logger.DEBUG_TASKSOVERALLPERF) {
 			time0 = System.currentTimeMillis();
 		}
 		if (init(project)) {
 			internalScan(project, project, scanMonitor);
 			shutdownDelegates(project);
 		}
 		if (Logger.DEBUG_TASKSOVERALLPERF) {
 			System.out.println("" + (System.currentTimeMillis() - time0) + "ms for " + project.getFullPath()); //$NON-NLS-1$ //$NON-NLS-2$
 		}
 	}


 	void scan(IResourceDelta delta, final IProgressMonitor monitor) {
 		if (monitor.isCanceled())
 			return;
 		if (Logger.DEBUG_TASKSOVERALLPERF) {
 			time0 = System.currentTimeMillis();
 		}
 		if (init(delta.getResource())) {
 			internalScan(delta, monitor);
 			shutdownDelegates(delta.getResource().getProject());
 		}
 		if (Logger.DEBUG_TASKSOVERALLPERF) {
 			System.out.println("" + (System.currentTimeMillis() - time0) + "ms for " + delta.getFullPath()); //$NON-NLS-1$ //$NON-NLS-2$
 		}
 	}

 	void scanFile(IProject project, TaskTag[] taskTags, IFile file, IProgressMonitor monitor) {
 		if (monitor.isCanceled())
 			return;

 		// 3 "stages"
 		monitor.beginTask("", 3);
 		monitor.subTask(file.getFullPath().toString());

 		List markerAttributes = null;
 		IContentType[] types = detectContentTypes(file);
 		Set markerTypes = new HashSet(3);
 		// Always included for safety and migration
 		markerTypes.add(DEFAULT_MARKER_TYPE);


 		monitor.worked(1);

 		IFileTaskScanner[] fileScanners = null;
 		if (types != null) {
 			if (fCurrentIgnoreContentTypes.length == 0) {
 				fileScanners = registry.getFileTaskScanners(types);
 			}
 			else {
 				List validTypes = new ArrayList();
 				// obtain a filtered list of delegates
 				for (int i = 0; i < types.length; i++) {
 					boolean ignoreContentType = false;
 					for (int j = 0; j < fCurrentIgnoreContentTypes.length; j++) {
 						ignoreContentType = ignoreContentType || types[i].isKindOf(fCurrentIgnoreContentTypes[j]);
 					}
 					if (!ignoreContentType) {
 						validTypes.add(types[i]);
 					}
 				}
 				fileScanners = registry.getFileTaskScanners((IContentType[]) validTypes.toArray(new IContentType[validTypes.size()]));
 			}
 			if (fileScanners.length > 0) {
 				IProgressMonitor scannerMonitor = new SubProgressMonitor(monitor, 1, SubProgressMonitor.SUPPRESS_SUBTASK_LABEL);
 				scannerMonitor.beginTask("", fileScanners.length); //$NON-NLS-1$
 				for (int j = 0; fileScanners != null && j < fileScanners.length; j++) {
 					if (monitor.isCanceled())
 						continue;
 					try {
 						if (!fActiveScanners.contains(fileScanners[j]) && !monitor.isCanceled()) {
 							fileScanners[j].startup(file.getProject());
 							fActiveScanners.add(fileScanners[j]);
 						}
 						markerTypes.add(fileScanners[j].getMarkerType());
 						Map[] taskMarkerAttributes = fileScanners[j].scan(file, taskTags, new SubProgressMonitor(scannerMonitor, 1, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));
 						/*
 						 * TODO: pool the marker results so there's only one
 						 * operation creating them
 						 */
 						for (int i = 0; i < taskMarkerAttributes.length; i++) {
 							if (markerAttributes == null) {
 								markerAttributes = new ArrayList();
 							}
 							if (!taskMarkerAttributes[i].containsKey(IMarker.TASK)) {
 								taskMarkerAttributes[i].put(IMarker.TASK, fileScanners[j].getMarkerType());
 							}
 							markerAttributes.add(taskMarkerAttributes[i]);
 						}
 					}
 					catch (Exception e) {
 						Logger.logException(file.getFullPath().toString(), e);
 					}
 				}
 				scannerMonitor.done();
 			}
 		}
 		else {
 			monitor.worked(1);
 		}

 		if (monitor.isCanceled())
 			return;
 		// only update markers if we ran a scanner on this file
 		if (fileScanners != null && fileScanners.length > 0) {
 			IProgressMonitor markerUpdateMonitor = new SubProgressMonitor(monitor, 1, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK);
 			if (markerAttributes != null) {
 				replaceTaskMarkers(file, (String[]) markerTypes.toArray(new String[markerTypes.size()]), (Map[]) markerAttributes.toArray(new Map[markerAttributes.size()]), markerUpdateMonitor);
 			}
 		}
 		else {
 			monitor.worked(1);
 		}
 		monitor.done();
 	}

 	private void shutdownDelegates(IProject project) {
 		for (int j = 0; j < fActiveScanners.size(); j++) {
 			try {
 				((IFileTaskScanner) fActiveScanners.get(j)).shutdown(project);
 			}
 			catch (Exception e) {
 				Logger.logException(project.getFullPath().toString(), e);
 			}
 		}
 		fActiveScanners = new ArrayList(1);
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2001, 2008 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
	* Jens Lukowski/Innoopract - initial renaming/restructuring
	*
	*******************************************************************************/
	package org.eclipse.wst.sse.core.internal.tasks;

	import java.util.ArrayList;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Map;
	import java.util.Set;

	import org.eclipse.core.resources.IContainer;
	import org.eclipse.core.resources.IFile;
	import org.eclipse.core.resources.IMarker;
	import org.eclipse.core.resources.IProject;
	import org.eclipse.core.resources.IResource;
	import org.eclipse.core.resources.IResourceDelta;
	import org.eclipse.core.resources.IWorkspace;
	import org.eclipse.core.resources.IWorkspaceRunnable;
	import org.eclipse.core.resources.ProjectScope;
	import org.eclipse.core.runtime.CoreException;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.OperationCanceledException;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.core.runtime.SubProgressMonitor;
	import org.eclipse.core.runtime.content.IContentDescription;
	import org.eclipse.core.runtime.content.IContentType;
	import org.eclipse.core.runtime.content.IContentTypeManager;
	import org.eclipse.core.runtime.preferences.DefaultScope;
	import org.eclipse.core.runtime.preferences.IPreferencesService;
	import org.eclipse.core.runtime.preferences.IScopeContext;
	import org.eclipse.core.runtime.preferences.InstanceScope;
	import org.eclipse.wst.sse.core.internal.Logger;
	import org.eclipse.wst.sse.core.internal.provisional.tasks.IFileTaskScanner;
	import org.eclipse.wst.sse.core.internal.provisional.tasks.TaskTag;
	import org.eclipse.wst.sse.core.utils.StringUtils;

	/**
	* Dispatcher for scanning based on deltas and requested projects
	*/
	class WorkspaceTaskScanner {
	private static WorkspaceTaskScanner _instance = null;

	static synchronized WorkspaceTaskScanner getInstance() {
	if (_instance == null) {
	_instance = new WorkspaceTaskScanner();
	}
	return _instance;
	}

	final String DEFAULT_MARKER_TYPE = IFileTaskScanner.TASK_MARKER_ID;
	private List fActiveScanners = null;
	private IContentType[] fCurrentIgnoreContentTypes = null;
	private TaskTag[] fCurrentTaskTags = null;

	private FileTaskScannerRegistryReader registry = null;

	private long time0;

	/**
	*
	*/
	private WorkspaceTaskScanner() {
	super();
	registry = FileTaskScannerRegistryReader.getInstance();
	fActiveScanners = new ArrayList();
	fCurrentTaskTags = new TaskTag[0];
	fCurrentIgnoreContentTypes = new IContentType[0];
	}

	private IContentType[] detectContentTypes(IResource resource) {
	IContentType[] types = null;
	if (resource.getType() == IResource.FILE && resource.isAccessible()) {
	types = Platform.getContentTypeManager().findContentTypesFor(resource.getName());
	if (types.length == 0) {
	IContentDescription d = null;
	try {
	// optimized description lookup, might not succeed
	d = ((IFile) resource).getContentDescription();
	if (d != null) {
	types = new IContentType[]{d.getContentType()};
	}
	}
	catch (CoreException e) {
	/*
	* should not be possible given the accessible and file
	* type check above
	*/
	}
	}
	if (types == null) {
	types = Platform.getContentTypeManager().findContentTypesFor(resource.getName());
	}
	if (Logger.DEBUG_TASKSCONTENTTYPE) {
	if (types.length > 0) {
	if (types.length > 1) {
	System.out.println(resource.getFullPath() + ": " + "multiple based on name (probably hierarchical)"); //$NON-NLS-1$ //$NON-NLS-2$
	}
	for (int i = 0; i < types.length; i++) {
	System.out.println(resource.getFullPath() + " matched: " + types[i].getId()); //$NON-NLS-1$
	}
	}
	}
	}
	return types;
	}

	/**
	* @param resource
	* @return
	*/
	private IProject getProject(IResource resource) {
	IProject project = null;
	if (resource.getType() == IResource.PROJECT) {
	project = (IProject) resource;
	}
	else {
	project = resource.getProject();
	}
	return project;
	}

	private boolean init(IResource resource) {
	IProject project = getProject(resource);

	IPreferencesService preferencesService = Platform.getPreferencesService();
	IScopeContext[] lookupOrder = new IScopeContext[]{new ProjectScope(project), new InstanceScope(), new DefaultScope()};

	boolean proceed = preferencesService.getBoolean(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_ENABLE, false, lookupOrder);

	if (Logger.DEBUG_TASKSPREFS) {
	System.out.println(getClass().getName() + " scan of " + resource.getFullPath() + ":" + proceed); //$NON-NLS-1$ //$NON-NLS-2$
	}

	if (proceed) {
	String[] tags = StringUtils.unpack(preferencesService.getString(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_TAGS, null, lookupOrder));
	String[] priorities = StringUtils.unpack(preferencesService.getString(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_PRIORITIES, null, lookupOrder));
	String[] currentIgnoreContentTypeIDs = StringUtils.unpack(preferencesService.getString(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED, null, lookupOrder));
	if (Logger.DEBUG_TASKSPREFS) {
	System.out.print(getClass().getName() + " tags: "); //$NON-NLS-1$
	for (int i = 0; i < tags.length; i++) {
	if (i > 0) {
	System.out.print(","); //$NON-NLS-1$
	}
	System.out.print(tags[i]);
	}
	System.out.println();
	System.out.print(getClass().getName() + " priorities: "); //$NON-NLS-1$
	for (int i = 0; i < priorities.length; i++) {
	if (i > 0) {
	System.out.print(","); //$NON-NLS-1$
	}
	System.out.print(priorities[i]);
	}
	System.out.println();
	System.out.print(getClass().getName() + " ignored content types: "); //$NON-NLS-1$
	for (int i = 0; i < currentIgnoreContentTypeIDs.length; i++) {
	if (i > 0) {
	System.out.print(","); //$NON-NLS-1$
	}
	System.out.print(currentIgnoreContentTypeIDs[i]);
	}
	System.out.println();
	}
	fCurrentIgnoreContentTypes = new IContentType[currentIgnoreContentTypeIDs.length];
	IContentTypeManager contentTypeManager = Platform.getContentTypeManager();
	for (int i = 0; i < currentIgnoreContentTypeIDs.length; i++) {
	fCurrentIgnoreContentTypes[i] = contentTypeManager.getContentType(currentIgnoreContentTypeIDs[i]);
	}
	int max = Math.min(tags.length, priorities.length);
	fCurrentTaskTags = new TaskTag[max];
	for (int i = 0; i < max; i++) {
	int priority = TaskTag.PRIORITY_NORMAL;
	try {
	priority = Integer.parseInt(priorities[i]);
	}
	catch (NumberFormatException e) {
	// default to normal priority
	}
	fCurrentTaskTags[i] = new TaskTag(tags[i], priority);
	}
	}
	return proceed;
	}

	void internalScan(final IProject project, final IResource resource, final IProgressMonitor scanMonitor) {
	if (scanMonitor.isCanceled())
	return;
	try {
	String name = resource.getName();
	if (resource.isAccessible() && !resource.isDerived() && !resource.isPhantom() && !resource.isTeamPrivateMember() && name.length() != 0 && name.charAt(0) != '.') {
	if ((resource.getType() & IResource.FOLDER) > 0 \|\| (resource.getType() & IResource.PROJECT) > 0) {
	IResource[] children = ((IContainer) resource).members();
	scanMonitor.beginTask("", children.length); //$NON-NLS-1$
	for (int i = 0; i < children.length; i++) {
	internalScan(project, children[i], new SubProgressMonitor(scanMonitor, 1, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));
	}
	scanMonitor.done();
	}
	else if ((resource.getType() & IResource.FILE) > 0) {
	scanFile(project, fCurrentTaskTags, (IFile) resource, scanMonitor);
	}
	}
	}
	catch (CoreException e) {
	Logger.logException(e);
	}
	}

	void internalScan(IResourceDelta delta, final IProgressMonitor monitor) {
	if (monitor.isCanceled())
	return;
	try {
	String name = delta.getFullPath().lastSegment();
	IResource resource = delta.getResource();
	if (!resource.isDerived() && !resource.isPhantom() && !resource.isTeamPrivateMember() && name.length() != 0 && name.charAt(0) != '.') {
	if ((resource.getType() & IResource.FOLDER) > 0 \|\| (resource.getType() & IResource.PROJECT) > 0) {
	IResourceDelta[] children = delta.getAffectedChildren();
	monitor.beginTask("", children.length);
	if (name.length() != 0 && name.charAt(0) != '.' && children.length > 0) {
	for (int i = children.length - 1; i >= 0; i--) {
	internalScan(children[i], new SubProgressMonitor(monitor, 1, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));
	}
	}
	monitor.done();
	}
	else if ((resource.getType() & IResource.FILE) > 0) {
	if ((delta.getKind() & IResourceDelta.ADDED) > 0 \|\| ((delta.getKind() & IResourceDelta.CHANGED) > 0 && (delta.getFlags() & IResourceDelta.CONTENT) > 0)) {
	IFile file = (IFile) resource;
	scanFile(file.getProject(), fCurrentTaskTags, file, monitor);
	}
	}
	}
	}
	catch (Exception e) {
	Logger.logException(e);
	}
	}

	private void replaceTaskMarkers(final IFile file, final String[] markerTypes, final Map markerAttributes[], IProgressMonitor monitor) {
	final IFile finalFile = file;
	if (file.isAccessible()) {
	try {
	IWorkspaceRunnable r = new IWorkspaceRunnable() {
	public void run(IProgressMonitor progressMonitor) throws CoreException {
	try {
	/*
	* Delete old Task markers (don't delete regular
	* Tasks since that includes user-defined ones)
	*/
	for (int i = 0; i < markerTypes.length; i++) {
	file.deleteMarkers(markerTypes[i], true, IResource.DEPTH_ZERO);
	}
	}
	catch (CoreException e) {
	Logger.logException("exception deleting old tasks", e); //$NON-NLS-1$
	}
	if (markerAttributes != null && markerAttributes.length > 0) {
	if (Logger.DEBUG_TASKS) {
	System.out.println("" + markerAttributes.length + " tasks for " + file.getFullPath()); //$NON-NLS-1$ //$NON-NLS-2$
	}
	for (int i = 0; i < markerAttributes.length; i++) {
	String specifiedMarkerType = (String) markerAttributes[i].get(IMarker.TASK);
	IMarker marker = finalFile.createMarker(specifiedMarkerType != null ? specifiedMarkerType : DEFAULT_MARKER_TYPE);
	marker.setAttributes(markerAttributes[i]);
	}
	}
	}
	};
	if (file.isAccessible()) {
	finalFile.getWorkspace().run(r, file, IWorkspace.AVOID_UPDATE, monitor);
	}
	}
	catch (CoreException e1) {
	Logger.logException(e1);
	}
	catch(OperationCanceledException e) {
	// not an error condition
	}
	}
	}

	void scan(final IProject project, final IProgressMonitor scanMonitor) {
	if (scanMonitor.isCanceled())
	return;
	if (Logger.DEBUG_TASKS) {
	System.out.println(getClass().getName() + " scanning project " + project.getName()); //$NON-NLS-1$
	}
	if (!project.isAccessible()) {
	if (Logger.DEBUG_TASKS) {
	System.out.println(getClass().getName() + " skipping inaccessible project " + project.getName()); //$NON-NLS-1$
	}
	return;
	}

	if (Logger.DEBUG_TASKSOVERALLPERF) {
	time0 = System.currentTimeMillis();
	}
	if (init(project)) {
	internalScan(project, project, scanMonitor);
	shutdownDelegates(project);
	}
	if (Logger.DEBUG_TASKSOVERALLPERF) {
	System.out.println("" + (System.currentTimeMillis() - time0) + "ms for " + project.getFullPath()); //$NON-NLS-1$ //$NON-NLS-2$
	}
	}


	void scan(IResourceDelta delta, final IProgressMonitor monitor) {
	if (monitor.isCanceled())
	return;
	if (Logger.DEBUG_TASKSOVERALLPERF) {
	time0 = System.currentTimeMillis();
	}
	if (init(delta.getResource())) {
	internalScan(delta, monitor);
	shutdownDelegates(delta.getResource().getProject());
	}
	if (Logger.DEBUG_TASKSOVERALLPERF) {
	System.out.println("" + (System.currentTimeMillis() - time0) + "ms for " + delta.getFullPath()); //$NON-NLS-1$ //$NON-NLS-2$
	}
	}

	void scanFile(IProject project, TaskTag[] taskTags, IFile file, IProgressMonitor monitor) {
	if (monitor.isCanceled())
	return;

	// 3 "stages"
	monitor.beginTask("", 3);
	monitor.subTask(file.getFullPath().toString());

	List markerAttributes = null;
	IContentType[] types = detectContentTypes(file);
	Set markerTypes = new HashSet(3);
	// Always included for safety and migration
	markerTypes.add(DEFAULT_MARKER_TYPE);


	monitor.worked(1);

	IFileTaskScanner[] fileScanners = null;
	if (types != null) {
	if (fCurrentIgnoreContentTypes.length == 0) {
	fileScanners = registry.getFileTaskScanners(types);
	}
	else {
	List validTypes = new ArrayList();
	// obtain a filtered list of delegates
	for (int i = 0; i < types.length; i++) {
	boolean ignoreContentType = false;
	for (int j = 0; j < fCurrentIgnoreContentTypes.length; j++) {
	ignoreContentType = ignoreContentType \|\| types[i].isKindOf(fCurrentIgnoreContentTypes[j]);
	}
	if (!ignoreContentType) {
	validTypes.add(types[i]);
	}
	}
	fileScanners = registry.getFileTaskScanners((IContentType[]) validTypes.toArray(new IContentType[validTypes.size()]));
	}
	if (fileScanners.length > 0) {
	IProgressMonitor scannerMonitor = new SubProgressMonitor(monitor, 1, SubProgressMonitor.SUPPRESS_SUBTASK_LABEL);
	scannerMonitor.beginTask("", fileScanners.length); //$NON-NLS-1$
	for (int j = 0; fileScanners != null && j < fileScanners.length; j++) {
	if (monitor.isCanceled())
	continue;
	try {
	if (!fActiveScanners.contains(fileScanners[j]) && !monitor.isCanceled()) {
	fileScanners[j].startup(file.getProject());
	fActiveScanners.add(fileScanners[j]);
	}
	markerTypes.add(fileScanners[j].getMarkerType());
	Map[] taskMarkerAttributes = fileScanners[j].scan(file, taskTags, new SubProgressMonitor(scannerMonitor, 1, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK));
	/*
	* TODO: pool the marker results so there's only one
	* operation creating them
	*/
	for (int i = 0; i < taskMarkerAttributes.length; i++) {
	if (markerAttributes == null) {
	markerAttributes = new ArrayList();
	}
	if (!taskMarkerAttributes[i].containsKey(IMarker.TASK)) {
	taskMarkerAttributes[i].put(IMarker.TASK, fileScanners[j].getMarkerType());
	}
	markerAttributes.add(taskMarkerAttributes[i]);
	}
	}
	catch (Exception e) {
	Logger.logException(file.getFullPath().toString(), e);
	}
	}
	scannerMonitor.done();
	}
	}
	else {
	monitor.worked(1);
	}

	if (monitor.isCanceled())
	return;
	// only update markers if we ran a scanner on this file
	if (fileScanners != null && fileScanners.length > 0) {
	IProgressMonitor markerUpdateMonitor = new SubProgressMonitor(monitor, 1, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK);
	if (markerAttributes != null) {
	replaceTaskMarkers(file, (String[]) markerTypes.toArray(new String[markerTypes.size()]), (Map[]) markerAttributes.toArray(new Map[markerAttributes.size()]), markerUpdateMonitor);
	}
	}
	else {
	monitor.worked(1);
	}
	monitor.done();
	}

	private void shutdownDelegates(IProject project) {
	for (int j = 0; j < fActiveScanners.size(); j++) {
	try {
	((IFileTaskScanner) fActiveScanners.get(j)).shutdown(project);
	}
	catch (Exception e) {
	Logger.logException(project.getFullPath().toString(), e);
	}
	}
	fActiveScanners = new ArrayList(1);
	}
	}