Copyright (c) 2000, 2017 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) 2000, 2017 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.team.core.synchronize;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.core.runtime.jobs.ILock;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.team.core.ITeamStatus;
import org.eclipse.team.core.TeamStatus;
import org.eclipse.team.core.synchronize.FastSyncInfoFilter.SyncInfoDirectionFilter;
import org.eclipse.team.internal.core.Policy;
import org.eclipse.team.internal.core.TeamPlugin;
import org.eclipse.team.internal.core.subscribers.SyncInfoStatistics;

A dynamic collection of SyncInfo objects that provides change notification to registered listeners. Batching of change notifications can be accomplished using the beginInput/endInput methods.
See Also:
SyncInfoTree
SyncInfo
ISyncInfoSetChangeListener
Since:
3.0/**
 * A dynamic collection of {@link SyncInfo} objects that provides
 * change notification to registered listeners. Batching of change notifications
 * can be accomplished using the <code>beginInput/endInput</code> methods.
 *
 * @see SyncInfoTree
 * @see SyncInfo
 * @see ISyncInfoSetChangeListener
 * @since 3.0
 */
public class SyncInfoSet {
	// fields used to hold resources of interest
	// {IPath -> SyncInfo}
	private Map<IPath, SyncInfo> resources = Collections.synchronizedMap(new HashMap<>());

	// keep track of number of sync kinds in the set
	private SyncInfoStatistics statistics = new SyncInfoStatistics();

	// keep track of errors that occurred while trying to populate the set
	private Map<IResource, ITeamStatus> errors = new HashMap<>();

	private boolean lockedForModification;

	
Create an empty set.
/**
	 * Create an empty set.
	 */
	public SyncInfoSet() {
	}

	
Create a SyncInfoSet containing the given SyncInfo
instances.
Params:
infos – the SyncInfo instances to be contained by this set/**
	 * Create a <code>SyncInfoSet</code> containing the given <code>SyncInfo</code>
	 * instances.
	 *
	 * @param infos the <code>SyncInfo</code> instances to be contained by this set
	 */
	public SyncInfoSet(SyncInfo[] infos) {
		this();
		// use the internal add since we can't have listeners at this point anyway
		for (SyncInfo info : infos) {
			internalAdd(info);
		}
	}

	
Return an array of SyncInfo for all out-of-sync resources that are contained by the set.
Returns:
an array of SyncInfo/**
	 * Return an array of <code>SyncInfo</code> for all out-of-sync resources that are contained by the set.
	 *
	 * @return an array of <code>SyncInfo</code>
	 */
	public synchronized SyncInfo[] getSyncInfos() {
		return resources.values().toArray(new SyncInfo[resources.size()]);
	}

	
Return all out-of-sync resources contained in this set. The default implementation
uses getSyncInfos() to determine the resources contained in the set.
Subclasses may override to optimize.
Returns:
all out-of-sync resources contained in the set/**
	 * Return all out-of-sync resources contained in this set. The default implementation
	 * uses <code>getSyncInfos()</code> to determine the resources contained in the set.
	 * Subclasses may override to optimize.
	 *
	 * @return all out-of-sync resources contained in the set
	 */
	public IResource[] getResources() {
		SyncInfo[] infos = getSyncInfos();
		List<IResource> resources = new ArrayList<>();
		for (SyncInfo info : infos) {
			resources.add(info.getLocal());
		}
		return resources.toArray(new IResource[resources.size()]);
	}

	
Return the SyncInfo for the given resource or null
if the resource is not contained in the set.
Params:
resource – the resource
Returns:
the SyncInfo for the resource or null if
the resource is in-sync or doesn't have synchronization information in this set./**
	 * Return the <code>SyncInfo</code> for the given resource or <code>null</code>
	 * if the resource is not contained in the set.
	 *
	 * @param resource the resource
	 * @return the <code>SyncInfo</code> for the resource or <code>null</code> if
	 * the resource is in-sync or doesn't have synchronization information in this set.
	 */
	public synchronized SyncInfo getSyncInfo(IResource resource) {
		return resources.get(resource.getFullPath());
	}

	
Return the number of out-of-sync resources contained in this set.
See Also:
countFor(int, int)
Returns:
the size of the set./**
	 * Return the number of out-of-sync resources contained in this set.
	 *
	 * @return the size of the set.
	 * @see #countFor(int, int)
	 */
	public synchronized int size() {
		return resources.size();
	}

	
Return the number of out-of-sync resources in the given set whose sync kind
matches the given kind and mask (e.g.
(SyncInfo#getKind() & mask) == kind).

For example, this will return the number of outgoing changes in the set:

long outgoing = countFor(SyncInfo.OUTGOING, SyncInfo.DIRECTION_MASK);

Params:
kind – the sync kind
mask – the sync kind mask
Returns:
the number of matching resources in the set./**
	 * Return the number of out-of-sync resources in the given set whose sync kind
	 * matches the given kind and mask (e.g.
	 * <code>(SyncInfo#getKind() &amp; mask) == kind</code>).
	 * <p>
	 * For example, this will return the number of outgoing changes in the set:
	 * </p>
	 *
	 * <pre>
	 * long outgoing = countFor(SyncInfo.OUTGOING, SyncInfo.DIRECTION_MASK);
	 * </pre>
	 *
	 * @param kind the sync kind
	 * @param mask the sync kind mask
	 * @return the number of matching resources in the set.
	 */
	public long countFor(int kind, int mask) {
		return statistics.countFor(kind, mask);
	}

	
Returns true if there are any conflicting nodes in the set, and
false otherwise.
Returns:
true if there are any conflicting nodes in the set, and
false otherwise./**
	 * Returns <code>true</code> if there are any conflicting nodes in the set, and
	 * <code>false</code> otherwise.
	 *
	 * @return <code>true</code> if there are any conflicting nodes in the set, and
	 * <code>false</code> otherwise.
	 */
	public boolean hasConflicts() {
		return countFor(SyncInfo.CONFLICTING, SyncInfo.DIRECTION_MASK) > 0;
	}

	
Return whether the set is empty.
Returns:
true if the set is empty/**
	 * Return whether the set is empty.
	 *
	 * @return <code>true</code> if the set is empty
	 */
	public synchronized boolean isEmpty() {
		return resources.isEmpty();
	}

	
Add the SyncInfo to the set, replacing any previously existing one.
Params:
info – the new SyncInfo/**
	 * Add the <code>SyncInfo</code> to the set, replacing any previously existing one.
	 *
	 * @param info the new <code>SyncInfo</code>
	 */
	protected synchronized void internalAdd(SyncInfo info) {
		Assert.isTrue(!lockedForModification);
		IResource local = info.getLocal();
		IPath path = local.getFullPath();
		SyncInfo oldSyncInfo = resources.put(path, info);
		if(oldSyncInfo == null) {
			statistics.add(info);
		} else {
			statistics.remove(oldSyncInfo);
			statistics.add(info);
		}
	}

	
Remove the resource from the set, updating all internal data structures.
Params:
resource – the resource to be removed
Returns:
the SyncInfo that was just removed/**
	 * Remove the resource from the set, updating all internal data structures.
	 *
	 * @param resource the resource to be removed
	 * @return the <code>SyncInfo</code> that was just removed
	 */
	protected synchronized SyncInfo internalRemove(IResource resource) {
		Assert.isTrue(!lockedForModification);
		IPath path = resource.getFullPath();
		SyncInfo info = resources.remove(path);
		if (info != null) {
			statistics.remove(info);
		}
		return info;
	}

	
Registers the given listener for sync info set notifications. Has
no effect if an identical listener is already registered.
Params:
listener – listener to register/**
	 * Registers the given listener for sync info set notifications. Has
	 * no effect if an identical listener is already registered.
	 *
	 * @param listener listener to register
	 */
	public void addSyncSetChangedListener(ISyncInfoSetChangeListener listener) {
		synchronized(listeners) {
			listeners.add(listener);
		}
	}

	
Removes the given listener from participant notifications. Has
no effect if listener is not already registered.
Params:
listener – listener to remove/**
	 * Removes the given listener from participant notifications. Has
	 * no effect if listener is not already registered.
	 *
	 * @param listener listener to remove
	 */
	public void removeSyncSetChangedListener(ISyncInfoSetChangeListener listener) {
		synchronized(listeners) {
			listeners.remove(listener);
		}
	}

	
Reset the sync set so it is empty. Listeners are notified of the change.
/**
	 * Reset the sync set so it is empty. Listeners are notified of the change.
	 */
	public void clear() {
		try {
			beginInput();
			errors.clear();
			resources.clear();
			statistics.clear();
			getChangeEvent().reset();
		} finally {
			endInput(null);
		}
	}

	/*
	 * Run the given runnable. This operation
	 * will block other threads from modifying the
	 * set and postpone any change notifications until after the runnable
	 * has been executed. Mutable subclasses must override.
	 * <p>
	 * The given runnable may be run in the same thread as the caller or
	 * more be run asynchronously in another thread at the discretion of the
	 * subclass implementation. However, it is guaranteed that two invocations
	 * of <code>run</code> performed in the same thread will be executed in the
	 * same order even if run in different threads.
	 * </p>
	 * @param runnable a runnable
	 * @param progress a progress monitor or <code>null</code>
	 */
	private void run(IWorkspaceRunnable runnable, IProgressMonitor monitor) {
		monitor = Policy.monitorFor(monitor);
		monitor.beginTask(null, 100);
		try {
			beginInput();
			runnable.run(Policy.subMonitorFor(monitor, 80));
		} catch (CoreException e) {
			addError(new TeamStatus(IStatus.ERROR, TeamPlugin.ID, ITeamStatus.SYNC_INFO_SET_ERROR, e.getMessage(), e, null));
		} finally {
			endInput(Policy.subMonitorFor(monitor, 20));
		}
	}

	
Connect the listener to the sync set in such a fashion that the listener will
be connected the the sync set using addChangeListener
and issued a reset event. This is done to provide a means of connecting to the
sync set and initializing a model based on the sync set without worrying about
missing events.

The reset event may be done in the context of this method invocation or may be
done in another thread at the discretion of the SyncInfoSet
implementation.

Disconnecting is done by calling removeChangeListener. Once disconnected,
a listener can reconnect to be re-initialized.

Params:
listener – the listener that should be connected to this set
monitor – a progress monitor/**
	 * Connect the listener to the sync set in such a fashion that the listener will
	 * be connected the the sync set using <code>addChangeListener</code>
	 * and issued a reset event. This is done to provide a means of connecting to the
	 * sync set and initializing a model based on the sync set without worrying about
	 * missing events.
	 * <p>
	 * The reset event may be done in the context of this method invocation or may be
	 * done in another thread at the discretion of the <code>SyncInfoSet</code>
	 * implementation.
	 * </p><p>
	 * Disconnecting is done by calling <code>removeChangeListener</code>. Once disconnected,
	 * a listener can reconnect to be re-initialized.
	 * </p>
	 * @param listener the listener that should be connected to this set
	 * @param monitor a progress monitor
	 */
	public void connect(final ISyncInfoSetChangeListener listener, IProgressMonitor monitor) {
		run(monitor1 -> {
			try {
				monitor1.beginTask(null, 100);
				addSyncSetChangedListener(listener);
				listener.syncInfoSetReset(SyncInfoSet.this, Policy.subMonitorFor(monitor1, 95));
			} finally {
				monitor1.done();
			}
		}, monitor);
	}

	private ILock lock = Job.getJobManager().newLock();

	private Set<ISyncInfoSetChangeListener> listeners = Collections.synchronizedSet(new HashSet<>());

	private SyncInfoSetChangeEvent changes = createEmptyChangeEvent();

	
Add the given SyncInfo to the set. A change event will
be generated unless the call to this method is nested in between calls
to beginInput() and endInput(IProgressMonitor)
in which case the event for this addition and any other sync set
change will be fired in a batched event when endInput
is invoked.

Invoking this method outside of the above mentioned block will result
in the endInput(IProgressMonitor) being invoked with a null
progress monitor. If responsiveness is required, the client should always
nest sync set modifications within beginInput/endInput.

Params:
info – the sync info to be added to this set./**
	 * Add the given <code>SyncInfo</code> to the set. A change event will
	 * be generated unless the call to this method is nested in between calls
	 * to <code>beginInput()</code> and <code>endInput(IProgressMonitor)</code>
	 * in which case the event for this addition and any other sync set
	 * change will be fired in a batched event when <code>endInput</code>
	 * is invoked.
	 * <p>
	 * Invoking this method outside of the above mentioned block will result
	 * in the <code>endInput(IProgressMonitor)</code> being invoked with a null
	 * progress monitor. If responsiveness is required, the client should always
	 * nest sync set modifications within <code>beginInput/endInput</code>.
	 * </p>
	 * @param info the sync info to be added to this set.
	 */
	public void add(SyncInfo info) {
		try {
			beginInput();
			boolean alreadyExists = getSyncInfo(info.getLocal()) != null;
			internalAdd(info);
			if (alreadyExists) {
				getChangeEvent().changed(info);
			} else {
				getChangeEvent().added(info);
			}
		} finally {
			endInput(null);
		}
	}

	
Add all the sync info from the given set to this set.
Params:
set – the set whose sync info should be added to this set/**
	 * Add all the sync info from the given set to this set.
	 *
	 * @param set the set whose sync info should be added to this set
	 */
	public void addAll(SyncInfoSet set) {
		try {
			beginInput();
			SyncInfo[] infos = set.getSyncInfos();
			for (SyncInfo info : infos) {
				add(info);
			}
		} finally {
			endInput(null);
		}
	}

	
Remove the given local resource from the set.
Params:
resource – the local resource to remove/**
	 * Remove the given local resource from the set.
	 *
	 * @param resource the local resource to remove
	 */
	public void remove(IResource resource) {
		try {
			beginInput();
			internalRemove(resource);
			getChangeEvent().removed(resource);
		} finally {
			endInput(null);
		}
	}

	
Remove all the given resources from the set.
Params:
resources – the resources to be removed/**
	 * Remove all the given resources from the set.
	 *
	 * @param resources the resources to be removed
	 */
	public void removeAll(IResource[] resources) {
		try {
			beginInput();
			for (IResource resource : resources) {
				remove(resource);
			}
		} finally {
			endInput(null);
		}
	}

	
Removes all conflicting nodes from this set.
/**
	 * Removes all conflicting nodes from this set.
	 */
	public void removeConflictingNodes() {
		rejectNodes(new SyncInfoDirectionFilter(SyncInfo.CONFLICTING));
	}

	
Removes all outgoing nodes from this set.
/**
	 * Removes all outgoing nodes from this set.
	 */
	public void removeOutgoingNodes() {
		rejectNodes(new SyncInfoDirectionFilter(SyncInfo.OUTGOING));
	}

	
Removes all incoming nodes from this set.
/**
	 * Removes all incoming nodes from this set.
	 */
	public void removeIncomingNodes() {
		rejectNodes(new SyncInfoDirectionFilter(SyncInfo.INCOMING));
	}

	
Indicate whether the set has nodes matching the given filter.
Params:
filter – a sync info filter
Returns:
whether the set has nodes that match the filter/**
	 * Indicate whether the set has nodes matching the given filter.
	 *
	 * @param filter a sync info filter
	 * @return whether the set has nodes that match the filter
	 */
	public boolean hasNodes(FastSyncInfoFilter filter) {
		SyncInfo[] infos = getSyncInfos();
		for (SyncInfo info : infos) {
			if (info != null && filter.select(info)) {
				return true;
			}
		}
		return false;
	}

	
Removes all nodes from this set that do not match the given filter
leaving only those that do match the filter.
Params:
filter – a sync info filter/**
	 * Removes all nodes from this set that do not match the given filter
	 * leaving only those that do match the filter.
	 *
	 * @param filter a sync info filter
	 */
	public void selectNodes(FastSyncInfoFilter filter) {
		try {
			beginInput();
			SyncInfo[] infos = getSyncInfos();
			for (SyncInfo info : infos) {
				if (info == null || !filter.select(info)) {
					remove(info.getLocal());
				}
			}
		} finally {
			endInput(null);
		}
	}

	
Removes all nodes from this set that match the given filter
leaving those that do not match the filter.
Params:
filter – a sync info filter/**
	 * Removes all nodes from this set that match the given filter
	 * leaving those that do not match the filter.
	 *
	 * @param filter a sync info filter
	 */
	public void rejectNodes(FastSyncInfoFilter filter) {
		try {
			beginInput();
			SyncInfo[] infos = getSyncInfos();
			for (SyncInfo info : infos) {
				if (info != null && filter.select(info)) {
					remove(info.getLocal());
				}
			}
		} finally {
			endInput(null);
		}
	}

	
Return all nodes in this set that match the given filter.
Params:
filter – a sync info filter
Returns:
the nodes that match the filter/**
	 * Return all nodes in this set that match the given filter.
	 *
	 * @param filter a sync info filter
	 * @return the nodes that match the filter
	 */
	public SyncInfo[] getNodes(FastSyncInfoFilter filter) {
		List<SyncInfo> result = new ArrayList<>();
		SyncInfo[] infos = getSyncInfos();
		for (SyncInfo info : infos) {
			if (info != null && filter.select(info)) {
				result.add(info);
			}
		}
		return result.toArray(new SyncInfo[result.size()]);
	}

	
Returns true if this sync set has incoming changes.
Note that conflicts are not considered to be incoming changes.
Returns:
true if this sync set has incoming changes./**
	 * Returns <code>true</code> if this sync set has incoming changes.
	 * Note that conflicts are not considered to be incoming changes.
	 *
	 * @return <code>true</code> if this sync set has incoming changes.
	 */
	public boolean hasIncomingChanges() {
		return countFor(SyncInfo.INCOMING, SyncInfo.DIRECTION_MASK) > 0;
	}

	
Returns true if this sync set has outgoing changes.
Note that conflicts are not considered to be outgoing changes.
Returns:
true if this sync set has outgoing changes./**
	 * Returns <code>true</code> if this sync set has outgoing changes.
	 * Note that conflicts are not considered to be outgoing changes.
	 *
	 * @return <code>true</code> if this sync set has outgoing changes.
	 */
	public boolean hasOutgoingChanges() {
		return countFor(SyncInfo.OUTGOING, SyncInfo.DIRECTION_MASK) > 0;
	}

	
This method is used to obtain a lock on the set which ensures thread safety
and batches change notification. If the set is locked by another thread, the
calling thread will block until the lock becomes available. This method uses
an org.eclipse.core.runtime.jobs.ILock.

It is important that the lock is released after it is obtained. Calls to
endInput should be done in a finally block as illustrated in the
following code snippet.

try {
	set.beginInput();
	// do stuff
} finally {
	set.endInput(progress);
}


Calls to beginInput and endInput can be nested and
must be matched.

/**
	 * This method is used to obtain a lock on the set which ensures thread safety
	 * and batches change notification. If the set is locked by another thread, the
	 * calling thread will block until the lock becomes available. This method uses
	 * an <code>org.eclipse.core.runtime.jobs.ILock</code>.
	 * <p>
	 * It is important that the lock is released after it is obtained. Calls to
	 * <code>endInput</code> should be done in a finally block as illustrated in the
	 * following code snippet.
	 * </p>
	 *
	 * <pre>
	 * try {
	 * 	set.beginInput();
	 * 	// do stuff
	 * } finally {
	 * 	set.endInput(progress);
	 * }
	 * </pre>
	 * <p>
	 * Calls to <code>beginInput</code> and <code>endInput</code> can be nested and
	 * must be matched.
	 * </p>
	 */
	public void beginInput() {
		lock.acquire();
	}

	
This method is used to release the lock on this set. The progress monitor is needed to allow
listeners to perform long-running operations is response to the set change. The lock is held
while the listeners are notified so listeners must be cautious in order to avoid deadlock.
Params:
monitor – a progress monitor/**
	 * This method is used to release the lock on this set. The progress monitor is needed to allow
	 * listeners to perform long-running operations is response to the set change. The lock is held
	 * while the listeners are notified so listeners must be cautious in order to avoid deadlock.
	 * @param monitor a progress monitor
	 */
	public void endInput(IProgressMonitor monitor) {
		try {
			if (lock.getDepth() == 1) {
				// Remain locked while firing the events so the handlers
				// can expect the set to remain constant while they process the events
				fireChanges(Policy.monitorFor(monitor));
			}
		} finally {
			lock.release();
		}
	}

	
Reset the changes accumulated so far by this set. This method is not
intended to be invoked or implemented by clients.
/**
	 * Reset the changes accumulated so far by this set. This method is not
	 * intended to be invoked or implemented by clients.
	 */
	protected void resetChanges() {
		changes = createEmptyChangeEvent();
	}

	
Create an empty change event. Subclass may override to provided specialized event types
Returns:
an empty change event
Since:
3.5/**
	 * Create an empty change event. Subclass may override to provided specialized event types
	 *
	 * @return an empty change event
	 * @since 3.5
	 */
	protected SyncInfoSetChangeEvent createEmptyChangeEvent() {
		return new SyncInfoSetChangeEvent(this);
	}

	private void fireChanges(final IProgressMonitor monitor) {
		// Only one thread at the time can enter the method, so the event we
		// send is static
		final SyncInfoSetChangeEvent event = getChangeEvent();
		resetChanges();

		// Ensure that the list of listeners is not changed while events are fired.
		// Copy the listeners so that addition/removal is not blocked by event listeners
		if(event.isEmpty() && ! event.isReset()) return;
		ISyncInfoSetChangeListener[] allListeners = getListeners();
		// Fire the events using an ISafeRunnable
		final ITeamStatus[] newErrors = event.getErrors();
		monitor.beginTask(null, 100 + (newErrors.length > 0 ? 50 : 0) * allListeners.length);
		for (ISyncInfoSetChangeListener listener : allListeners) {
			SafeRunner.run(new ISafeRunnable() {
				@Override
				public void handleException(Throwable exception) {
					// don't log the exception....it is already being logged in Platform#run
				}
				@Override
				public void run() throws Exception {
					try {
						lockedForModification = true;
						if (event.isReset()) {
							listener.syncInfoSetReset(SyncInfoSet.this, Policy.subMonitorFor(monitor, 100));
						} else {
							listener.syncInfoChanged(event, Policy.subMonitorFor(monitor, 100));
						}
						if (newErrors.length > 0) {
							listener.syncInfoSetErrors(SyncInfoSet.this, newErrors, Policy.subMonitorFor(monitor, 50));
						}
					} finally {
						lockedForModification = false;
					}
				}
			});
		}
		monitor.done();
	}

	
Return a copy of all the listeners registered with this set
Returns:
the listeners/**
	 * Return a copy of all the listeners registered with this set
	 * @return the listeners
	 */
	protected ISyncInfoSetChangeListener[] getListeners() {
		ISyncInfoSetChangeListener[] allListeners;
		synchronized(listeners) {
			allListeners = listeners.toArray(new ISyncInfoSetChangeListener[listeners.size()]);
		}
		return allListeners;
	}

	
Return the change event that is accumulating the changes to the set. This
can be called by subclasses to access the event.
Returns:
Returns the changes.
@nooverride
This method is not intended to be re-implemented or extended
            by clients.
Since:
3.5/**
	 * Return the change event that is accumulating the changes to the set. This
	 * can be called by subclasses to access the event.
	 *
	 * @return Returns the changes.
	 * @nooverride This method is not intended to be re-implemented or extended
	 *             by clients.
	 * @since 3.5
	 */
	protected SyncInfoSetChangeEvent getChangeEvent() {
		return changes;
	}

	
Add the error to the set. Errors should be added to the set when the client
populating the set cannot determine the SyncInfo for one
or more resources due to an exception or some other problem. Listeners
will be notified that an error occurred and can react accordingly.

Only one error can be associated with a resource (which is obtained from
the ITeamStatus). It is up to the
client populating the set to ensure that the error associated with a
resource contains all relevant information.
The error will remain in the set until the set is reset.

Params:
status – the status that describes the error that occurred./**
	 * Add the error to the set. Errors should be added to the set when the client
	 * populating the set cannot determine the <code>SyncInfo</code> for one
	 * or more resources due to an exception or some other problem. Listeners
	 * will be notified that an error occurred and can react accordingly.
	 * <p>
	 * Only one error can be associated with a resource (which is obtained from
	 * the <code>ITeamStatus</code>). It is up to the
	 * client populating the set to ensure that the error associated with a
	 * resource contains all relevant information.
	 * The error will remain in the set until the set is reset.
	 * </p>
	 * @param status the status that describes the error that occurred.
	 */
	public void addError(ITeamStatus status) {
		try {
			beginInput();
			errors.put(status.getResource(), status);
			getChangeEvent().errorOccurred(status);
		} finally {
			endInput(null);
		}
	}

	
Return an array of the errors the occurred while populating this set.
The errors will remain with the set until it is reset.
Returns:
the errors/**
	 * Return an array of the errors the occurred while populating this set.
	 * The errors will remain with the set until it is reset.
	 *
	 * @return the errors
	 */
	public ITeamStatus[] getErrors() {
		return errors.values().toArray(new ITeamStatus[errors.size()]);
	}

	
Return an iterator over all SyncInfo
contained in this set.
Returns:
an iterator over all SyncInfo
contained in this set.
Since:
3.1/**
	 * Return an iterator over all <code>SyncInfo</code>
	 * contained in this set.
	 * @return an iterator over all <code>SyncInfo</code>
	 * contained in this set.
	 * @since 3.1
	 */
	public Iterator iterator() {
		return resources.values().iterator();
	}
}