bundles/org.eclipse.emf.emfstore.client.ui/src/org/eclipse/emf/emfstore/internal/client/ui/views/scm/SCMLabelProvider.java - emf-store/org.eclipse.emf.emfstore.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2008-2011 Chair for Applied Software Engineering,
  * Technische Universitaet Muenchen.
  * 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:
  * Shterev
  ******************************************************************************/
 package org.eclipse.emf.emfstore.internal.client.ui.views.scm;

 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.Iterator;
 import java.util.List;

 import org.apache.commons.lang.StringUtils;
 import org.eclipse.emf.common.util.EList;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
 import org.eclipse.emf.edit.ui.provider.AdapterFactoryLabelProvider;
 import org.eclipse.emf.emfstore.internal.client.model.ESWorkspaceProviderImpl;
 import org.eclipse.emf.emfstore.internal.client.ui.Activator;
 import org.eclipse.emf.emfstore.internal.client.ui.common.EClassFilter;
 import org.eclipse.emf.emfstore.internal.client.ui.views.changes.ChangePackageVisualizationHelper;
 import org.eclipse.emf.emfstore.internal.common.model.ModelElementId;
 import org.eclipse.emf.emfstore.internal.common.model.Project;
 import org.eclipse.emf.emfstore.internal.common.model.util.ModelUtil;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.AbstractChangePackage;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.ChangePackage;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.FileBasedChangePackage;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.HistoryInfo;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.ImageProxy;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.LogMessage;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.OperationProxy;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.TagVersionSpec;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.operations.AbstractOperation;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.operations.CompositeOperation;
 import org.eclipse.emf.emfstore.internal.server.model.versioning.operations.OperationId;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.jface.viewers.ColumnLabelProvider;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Font;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.graphics.ImageData;
 import org.eclipse.swt.graphics.PaletteData;
 import org.eclipse.swt.graphics.RGB;
 import org.eclipse.swt.widgets.Display;

 /**
  * Label provider for the SCM views.
  *
  * @author Shterev
  */
 public class SCMLabelProvider extends ColumnLabelProvider implements ProxyInitializer {

 	private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd, HH:mm"); //$NON-NLS-1$

 	private static final String ELEMENT_NOT_FOUND = Messages.SCMLabelProvider_InsufficientInformation;
 	/**
 	 * String to display as info for Local revisions.
 	 */
 	protected static final String LOCAL_REVISION = Messages.SCMLabelProvider_LocalRevision;

 	private final List<OperationId> highlighted;

 	private ChangePackageVisualizationHelper changePackageVisualizationHelper;
 	private final Image baseRevision;
 	private final Image currentRevision;
 	private final Image headRevision;

 	private ComposedAdapterFactory adapterFactory;
 	private AdapterFactoryLabelProvider adapterFactoryLabelProvider;
 	private Project project;

 	/**
 	 * Default constructor.
 	 *
 	 * @param project
 	 *            the project that is used to resolve revision numbers
 	 */
 	public SCMLabelProvider(Project project) {
 		super();
 		this.project = project;
 		highlighted = new ArrayList<OperationId>();

 		baseRevision = Activator.getImageDescriptor("icons/HistoryInfo_base.png").createImage(); //$NON-NLS-1$
 		currentRevision = Activator.getImageDescriptor("icons/HistoryInfo_current.png").createImage(); //$NON-NLS-1$
 		headRevision = Activator.getImageDescriptor("icons/HistoryInfo_head.png").createImage(); //$NON-NLS-1$
 		init();
 	}

 	private void init() {
 		if (adapterFactory == null) {
 			adapterFactory = new ComposedAdapterFactory(
 				ComposedAdapterFactory.Descriptor.Registry.INSTANCE);
 		}
 		if (adapterFactoryLabelProvider == null) {
 			adapterFactoryLabelProvider = new AdapterFactoryLabelProvider(adapterFactory);
 		}
 	}

 	/**
 	 * Default constructor.
 	 */
 	public SCMLabelProvider() {
 		this(null);
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	public String getText(Object element) {

 		String ret = null;
 		if (element instanceof OperationProxy) {
 			final OperationProxy proxy = (OperationProxy) element;
 			return getText(proxy);
 		} else if (element instanceof HistoryInfo) {
 			final HistoryInfo historyInfo = (HistoryInfo) element;
 			return getText(historyInfo);
 		} else if (element instanceof AbstractOperation
 			&& changePackageVisualizationHelper != null) {
 			ret = changePackageVisualizationHelper
 				.getDescription((AbstractOperation) element);
 		} else if (element instanceof ModelElementId
 			&& changePackageVisualizationHelper != null) {
 			final EObject modelElement = changePackageVisualizationHelper
 				.getModelElement((ModelElementId) element);
 			if (modelElement != null) {
 				ret = adapterFactoryLabelProvider.getText(modelElement);
 			} else {
 				return ELEMENT_NOT_FOUND;
 			}
 		} else if (element instanceof ChangePackage) {
 			final ChangePackage changePackage = (ChangePackage) element;
 			return getText(changePackage);
 		} else if (element instanceof FileBasedChangePackage) {
 			final FileBasedChangePackage changePackage = (FileBasedChangePackage) element;
 			return getText(changePackage);
 		} else if (element instanceof EObject) {
 			// TODO: rather reference virtual node directly??
 			ret = adapterFactoryLabelProvider.getText(element);
 		} else if (element instanceof VirtualNode<?>) {
 			// TreeNode node = (TreeNode) element;
 			// must be node containing filtered operations
 			// if (node.getValue() instanceof ChangePackage) {
 			return EClassFilter.INSTANCE.getFilterLabel();
 			// }
 		} else {
 			ret = super.getText(element);
 		}

 		return ret;
 	}

 	private String getText(AbstractChangePackage changePackage) {
 		final StringBuilder builder = new StringBuilder();
 		builder.append(Messages.SCMLabelProvider_ChangePackage);
 		if (changePackage.getLogMessage() != null) {
 			final LogMessage logMessage = changePackage.getLogMessage();
 			builder.append(" ["); //$NON-NLS-1$
 			builder.append(logMessage.getAuthor());
 			final Date clientDate = logMessage.getClientDate();
 			if (clientDate != null) {
 				builder.append(" @ "); //$NON-NLS-1$
 				builder.append(dateFormat.format(clientDate));
 			}
 			builder.append("] "); //$NON-NLS-1$
 			builder.append(logMessage.getMessage());
 		}
 		return builder.toString();
 	}

 	/**
 	 * Gets the text for a history info. This may be overridden by subclasses to
 	 * change the behavior (e.g. if info should be distributed across multiply
 	 * label providers)
 	 *
 	 * @param historyInfo
 	 *            The historInfo the text is retrieved for.
 	 * @return The text for the given historyInfo.
 	 */
 	protected String getText(HistoryInfo historyInfo) {
 		if (historyInfo.getPrimarySpec() != null
 			&& historyInfo.getPrimarySpec().getIdentifier() == -1) {
 			return LOCAL_REVISION;
 		}

 		String baseVersion = StringUtils.EMPTY;
 		if (historyInfo.getPrimarySpec().getIdentifier() == ESWorkspaceProviderImpl
 			.getProjectSpace(project).getBaseVersion().getIdentifier()) {
 			baseVersion = "*"; //$NON-NLS-1$
 		}
 		final StringBuilder builder = new StringBuilder();

 		if (!historyInfo.getTagSpecs().isEmpty()) {
 			builder.append("["); //$NON-NLS-1$
 			for (final TagVersionSpec versionSpec : historyInfo.getTagSpecs()) {
 				builder.append(versionSpec.getName());
 				builder.append(","); //$NON-NLS-1$
 			}
 			builder.replace(builder.length() - 1, builder.length(), "] "); //$NON-NLS-1$
 		}

 		builder.append(baseVersion);
 		builder.append(Messages.SCMLabelProvider_Version);
 		builder.append(historyInfo.getPrimarySpec().getIdentifier());
 		LogMessage logMessage = null;

 		if (historyInfo.getLogMessage() != null) {
 			logMessage = historyInfo.getLogMessage();
 		} else if (historyInfo.getChangePackage() != null
 			&& historyInfo.getChangePackage().getLogMessage() != null) {
 			logMessage = historyInfo.getChangePackage().getLogMessage();
 		}
 		if (logMessage != null) {
 			builder.append(" ["); //$NON-NLS-1$
 			builder.append(logMessage.getAuthor());
 			final Date clientDate = logMessage.getClientDate();
 			if (clientDate != null) {
 				builder.append(" @ "); //$NON-NLS-1$
 				builder.append(dateFormat.format(clientDate));
 			}
 			builder.append("] "); //$NON-NLS-1$
 			builder.append(logMessage.getMessage());
 		}
 		return builder.toString();
 	}

 	private String getText(OperationProxy proxy) {
 		if (!proxy.isLabelProviderReady()) {
 			initProxy(proxy);
 		}
 		return proxy.getLabel();
 	}

 	private ImageData createImageFromProxy(OperationProxy proxy) {
 		if (!proxy.isLabelProviderReady()) {
 			initProxy(proxy);
 		}
 		final ImageProxy imageProxy = proxy.getImage();
 		final ImageData imageData = new ImageData(imageProxy.getWidth(), imageProxy.getHeight(), imageProxy.getDepth(),
 			createPaletteData(imageProxy), imageProxy.getScanlinePad(), imageProxy.getData());
 		return imageData;
 	}

 	private PaletteData createPaletteData(final ImageProxy imageProxy) {
 		if (imageProxy.isDirect()) {
 			return new PaletteData(imageProxy.getRedMask(), imageProxy.getGreenMask(), imageProxy.getBlueMask());
 		}
 		final RGB[] colors = new RGB[imageProxy.getPaletteColors().length];
 		for (int i = 0; i < imageProxy.getPaletteColors().length; i++) {
 			final ImageProxy.RGB rgb = imageProxy.getPaletteColors()[i];
 			colors[i] = new RGB(rgb.getRed(), rgb.getGreen(), rgb.getBlue());
 		}
 		return new PaletteData(colors);
 	}

 	private void initProxy(OperationProxy proxy) {
 		final FileBasedChangePackage changePackage = getChangePackage(proxy);
 		final AbstractOperation operation = changePackage.get(proxy.getIndex());
 		prepareProxy(proxy, operation);
 	}

 	private ImageProxy.RGB[] createColorData(RGB[] colors) {
 		ImageProxy.RGB[] result = null;
 		if (colors != null) {
 			result = new ImageProxy.RGB[colors.length];
 			for (int i = 0; i < colors.length; i++) {
 				result[i] = new ImageProxy.RGB(colors[i].red, colors[i].green, colors[i].blue);
 			}
 		}
 		return result;
 	}

 	/**
 	 *
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.emf.emfstore.internal.client.ui.views.scm.ProxyInitializer#prepareProxy(org.eclipse.emf.emfstore.internal.server.model.versioning.OperationProxy,
 	 *      org.eclipse.emf.emfstore.internal.server.model.versioning.operations.AbstractOperation)
 	 */
 	public void prepareProxy(OperationProxy proxy, AbstractOperation operation) {
 		final ImageData imageData = changePackageVisualizationHelper.getImage(adapterFactoryLabelProvider, operation)
 			.getImageData();
 		final ImageProxy imageProxy = ImageProxy.create().setWitdh(imageData.width).setHeight(imageData.height)
 			.setDepth(imageData.depth).setRedMask(imageData.palette.redMask).setGreenMask(imageData.palette.greenMask)
 			.setBlueMask(imageData.palette.blueMask).setScanlinePad(imageData.scanlinePad).setData(imageData.data);
 		if (!imageData.palette.isDirect) {
 			imageProxy.setPaletteColors(createColorData(imageData.palette.colors));
 		}
 		proxy.setImage(imageProxy);
 		proxy.setLabel(changePackageVisualizationHelper.getDescription(operation));

 		if (CompositeOperation.class.isInstance(operation)) {
 			final CompositeOperation compositeOperation = (CompositeOperation) operation;
 			final EList<AbstractOperation> subOperations = compositeOperation.getSubOperations();
 			final EList<OperationProxy> proxies = proxy.getProxies();

 			final Iterator<AbstractOperation> subOperationsIterator = subOperations.iterator();
 			final Iterator<OperationProxy> proxiesIterator = proxies.iterator();

 			while (subOperationsIterator.hasNext()) {
 				final AbstractOperation op = subOperationsIterator.next();
 				final OperationProxy p = proxiesIterator.next();
 				prepareProxy(p, op);
 			}
 		}
 	}

 	private FileBasedChangePackage getChangePackage(OperationProxy proxy) {
 		return ModelUtil.getParent(FileBasedChangePackage.class, proxy);
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	public Color getForeground(Object element) {

 		if (element instanceof AbstractOperation) {
 			final AbstractOperation operation = (AbstractOperation) element;
 			if (highlighted.contains(operation.getOperationId())) {
 				return Display.getCurrent().getSystemColor(SWT.COLOR_RED);
 			}
 		}

 		return super.getForeground(element);
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	public Font getFont(Object element) {

 		final Font italic = JFaceResources.getFontRegistry().getItalic(
 			JFaceResources.DIALOG_FONT);
 		final Font bold = JFaceResources.getFontRegistry().getBold(
 			JFaceResources.DIALOG_FONT);

 		String text = getText(element);
 		if (text == null) {
 			text = StringUtils.EMPTY;
 		}
 		if (element instanceof HistoryInfo) {
 			if (text.equals(LOCAL_REVISION)) {
 				return italic;
 			}
 			final HistoryInfo historyInfo = (HistoryInfo) element;
 			if (historyInfo.getPrimarySpec().getIdentifier() == ESWorkspaceProviderImpl
 				.getProjectSpace(project).getBaseVersion().getIdentifier()) {
 				return bold;
 			}
 		} else if (element instanceof ModelElementId) {
 			if (text.equals(ELEMENT_NOT_FOUND)) {
 				return italic;
 			}
 		} else if (element instanceof VirtualNode<?>) {
 			return italic;
 		}
 		if (element instanceof EObject
 			&& ((EObject) element).eContainer() instanceof AbstractOperation) {
 			final AbstractOperation op = (AbstractOperation) ((EObject) element)
 				.eContainer();
 			if (element instanceof ModelElementId
 				&& element.equals(op.getModelElementId())) {
 				return bold;
 			}

 			final EObject modelElement = (EObject) element;
 			final Project project = ModelUtil.getProject(modelElement);
 			if (project != null
 				&& project.getModelElementId(modelElement).equals(
 					op.getModelElementId())) {
 				return bold;
 			}
 		}
 		return null;
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	public Image getImage(Object element) {

 		if (element instanceof OperationProxy) {
 			final OperationProxy proxy = (OperationProxy) element;
 			final ImageData imageData = createImageFromProxy(proxy);
 			final Image swtImage = new Image(
 				Display.getDefault(),
 				imageData);
 			return swtImage;
 		} else if (element instanceof ModelElementId) {
 			return adapterFactoryLabelProvider
 				.getImage(changePackageVisualizationHelper
 					.getModelElement((ModelElementId) element));
 		} else if (element instanceof HistoryInfo) {
 			final String text = getText(element);
 			if (text.equals(LOCAL_REVISION)) {
 				return currentRevision;
 			}
 			if (text.matches("\\[.*BASE.*\\].*")) { //$NON-NLS-1$
 				return baseRevision;
 			}
 			if (text.matches("\\[.*HEAD.*\\].*")) { //$NON-NLS-1$
 				return headRevision;
 			}
 		}
 		if (element instanceof CompositeOperation
 			&& ((CompositeOperation) element).getMainOperation() != null) {
 			return changePackageVisualizationHelper.getImage(
 				adapterFactoryLabelProvider,
 				((CompositeOperation) element).getMainOperation());
 		}

 		if (element instanceof AbstractOperation) {
 			return changePackageVisualizationHelper.getImage(
 				adapterFactoryLabelProvider, (AbstractOperation) element);
 		}

 		return adapterFactoryLabelProvider.getImage(element);
 	}

 	/**
 	 * @param changePackageVisualizationHelper
 	 *            the changePackageVisualizationHelper to set
 	 */
 	public void setChangePackageVisualizationHelper(
 		ChangePackageVisualizationHelper changePackageVisualizationHelper) {
 		this.changePackageVisualizationHelper = changePackageVisualizationHelper;
 	}

 	/**
 	 * @return the changePackageVisualizationHelper
 	 */
 	public ChangePackageVisualizationHelper getChangePackageVisualizationHelper() {
 		return changePackageVisualizationHelper;
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	@Override
 	public String getToolTipText(Object element) {
 		final HistoryInfo historyInfo = ModelUtil.getParent(HistoryInfo.class,
 			(EObject) element);
 		return getText(historyInfo);
 	}

 	/**
 	 * @return the highlighted elements list.
 	 */
 	public List<OperationId> getHighlighted() {
 		return highlighted;
 	}

 	/**
 	 *
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.jface.viewers.BaseLabelProvider#dispose()
 	 */
 	@Override
 	public void dispose() {
 		super.dispose();
 		changePackageVisualizationHelper.dispose();
 		headRevision.dispose();
 		currentRevision.dispose();
 		baseRevision.dispose();
 		disposeAdapterFactories();
 	}

 	private void disposeAdapterFactories() {
 		if (adapterFactory != null) {
 			adapterFactory.dispose();
 			adapterFactory = null;
 		}
 		if (adapterFactoryLabelProvider != null) {
 			adapterFactoryLabelProvider.dispose();
 			adapterFactoryLabelProvider = null;
 		}
 	}

 	/**
 	 * @return The project this label provider provides labels for.
 	 */
 	protected Project getProject() {
 		return project;
 	}

 	/**
 	 * Sets the project that is used to resolve revision numbers that are
 	 * possibly used within the labels.
 	 *
 	 * @param newProject
 	 *            the project to be set
 	 */
 	public void setProject(Project newProject) {
 		project = newProject;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2008-2011 Chair for Applied Software Engineering,
	* Technische Universitaet Muenchen.
	* 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:
	* Shterev
	******************************************************************************/
	package org.eclipse.emf.emfstore.internal.client.ui.views.scm;

	import java.text.SimpleDateFormat;
	import java.util.ArrayList;
	import java.util.Date;
	import java.util.Iterator;
	import java.util.List;

	import org.apache.commons.lang.StringUtils;
	import org.eclipse.emf.common.util.EList;
	import org.eclipse.emf.ecore.EObject;
	import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
	import org.eclipse.emf.edit.ui.provider.AdapterFactoryLabelProvider;
	import org.eclipse.emf.emfstore.internal.client.model.ESWorkspaceProviderImpl;
	import org.eclipse.emf.emfstore.internal.client.ui.Activator;
	import org.eclipse.emf.emfstore.internal.client.ui.common.EClassFilter;
	import org.eclipse.emf.emfstore.internal.client.ui.views.changes.ChangePackageVisualizationHelper;
	import org.eclipse.emf.emfstore.internal.common.model.ModelElementId;
	import org.eclipse.emf.emfstore.internal.common.model.Project;
	import org.eclipse.emf.emfstore.internal.common.model.util.ModelUtil;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.AbstractChangePackage;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.ChangePackage;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.FileBasedChangePackage;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.HistoryInfo;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.ImageProxy;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.LogMessage;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.OperationProxy;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.TagVersionSpec;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.operations.AbstractOperation;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.operations.CompositeOperation;
	import org.eclipse.emf.emfstore.internal.server.model.versioning.operations.OperationId;
	import org.eclipse.jface.resource.JFaceResources;
	import org.eclipse.jface.viewers.ColumnLabelProvider;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.graphics.Color;
	import org.eclipse.swt.graphics.Font;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.graphics.ImageData;
	import org.eclipse.swt.graphics.PaletteData;
	import org.eclipse.swt.graphics.RGB;
	import org.eclipse.swt.widgets.Display;

	/**
	* Label provider for the SCM views.
	*
	* @author Shterev
	*/
	public class SCMLabelProvider extends ColumnLabelProvider implements ProxyInitializer {

	private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd, HH:mm"); //$NON-NLS-1$

	private static final String ELEMENT_NOT_FOUND = Messages.SCMLabelProvider_InsufficientInformation;
	/**
	* String to display as info for Local revisions.
	*/
	protected static final String LOCAL_REVISION = Messages.SCMLabelProvider_LocalRevision;

	private final List<OperationId> highlighted;

	private ChangePackageVisualizationHelper changePackageVisualizationHelper;
	private final Image baseRevision;
	private final Image currentRevision;
	private final Image headRevision;

	private ComposedAdapterFactory adapterFactory;
	private AdapterFactoryLabelProvider adapterFactoryLabelProvider;
	private Project project;

	/**
	* Default constructor.
	*
	* @param project
	* the project that is used to resolve revision numbers
	*/
	public SCMLabelProvider(Project project) {
	super();
	this.project = project;
	highlighted = new ArrayList<OperationId>();

	baseRevision = Activator.getImageDescriptor("icons/HistoryInfo_base.png").createImage(); //$NON-NLS-1$
	currentRevision = Activator.getImageDescriptor("icons/HistoryInfo_current.png").createImage(); //$NON-NLS-1$
	headRevision = Activator.getImageDescriptor("icons/HistoryInfo_head.png").createImage(); //$NON-NLS-1$
	init();
	}

	private void init() {
	if (adapterFactory == null) {
	adapterFactory = new ComposedAdapterFactory(
	ComposedAdapterFactory.Descriptor.Registry.INSTANCE);
	}
	if (adapterFactoryLabelProvider == null) {
	adapterFactoryLabelProvider = new AdapterFactoryLabelProvider(adapterFactory);
	}
	}

	/**
	* Default constructor.
	*/
	public SCMLabelProvider() {
	this(null);
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public String getText(Object element) {

	String ret = null;
	if (element instanceof OperationProxy) {
	final OperationProxy proxy = (OperationProxy) element;
	return getText(proxy);
	} else if (element instanceof HistoryInfo) {
	final HistoryInfo historyInfo = (HistoryInfo) element;
	return getText(historyInfo);
	} else if (element instanceof AbstractOperation
	&& changePackageVisualizationHelper != null) {
	ret = changePackageVisualizationHelper
	.getDescription((AbstractOperation) element);
	} else if (element instanceof ModelElementId
	&& changePackageVisualizationHelper != null) {
	final EObject modelElement = changePackageVisualizationHelper
	.getModelElement((ModelElementId) element);
	if (modelElement != null) {
	ret = adapterFactoryLabelProvider.getText(modelElement);
	} else {
	return ELEMENT_NOT_FOUND;
	}
	} else if (element instanceof ChangePackage) {
	final ChangePackage changePackage = (ChangePackage) element;
	return getText(changePackage);
	} else if (element instanceof FileBasedChangePackage) {
	final FileBasedChangePackage changePackage = (FileBasedChangePackage) element;
	return getText(changePackage);
	} else if (element instanceof EObject) {
	// TODO: rather reference virtual node directly??
	ret = adapterFactoryLabelProvider.getText(element);
	} else if (element instanceof VirtualNode<?>) {
	// TreeNode node = (TreeNode) element;
	// must be node containing filtered operations
	// if (node.getValue() instanceof ChangePackage) {
	return EClassFilter.INSTANCE.getFilterLabel();
	// }
	} else {
	ret = super.getText(element);
	}

	return ret;
	}

	private String getText(AbstractChangePackage changePackage) {
	final StringBuilder builder = new StringBuilder();
	builder.append(Messages.SCMLabelProvider_ChangePackage);
	if (changePackage.getLogMessage() != null) {
	final LogMessage logMessage = changePackage.getLogMessage();
	builder.append(" ["); //$NON-NLS-1$
	builder.append(logMessage.getAuthor());
	final Date clientDate = logMessage.getClientDate();
	if (clientDate != null) {
	builder.append(" @ "); //$NON-NLS-1$
	builder.append(dateFormat.format(clientDate));
	}
	builder.append("] "); //$NON-NLS-1$
	builder.append(logMessage.getMessage());
	}
	return builder.toString();
	}

	/**
	* Gets the text for a history info. This may be overridden by subclasses to
	* change the behavior (e.g. if info should be distributed across multiply
	* label providers)
	*
	* @param historyInfo
	* The historInfo the text is retrieved for.
	* @return The text for the given historyInfo.
	*/
	protected String getText(HistoryInfo historyInfo) {
	if (historyInfo.getPrimarySpec() != null
	&& historyInfo.getPrimarySpec().getIdentifier() == -1) {
	return LOCAL_REVISION;
	}

	String baseVersion = StringUtils.EMPTY;
	if (historyInfo.getPrimarySpec().getIdentifier() == ESWorkspaceProviderImpl
	.getProjectSpace(project).getBaseVersion().getIdentifier()) {
	baseVersion = "*"; //$NON-NLS-1$
	}
	final StringBuilder builder = new StringBuilder();

	if (!historyInfo.getTagSpecs().isEmpty()) {
	builder.append("["); //$NON-NLS-1$
	for (final TagVersionSpec versionSpec : historyInfo.getTagSpecs()) {
	builder.append(versionSpec.getName());
	builder.append(","); //$NON-NLS-1$
	}
	builder.replace(builder.length() - 1, builder.length(), "] "); //$NON-NLS-1$
	}

	builder.append(baseVersion);
	builder.append(Messages.SCMLabelProvider_Version);
	builder.append(historyInfo.getPrimarySpec().getIdentifier());
	LogMessage logMessage = null;

	if (historyInfo.getLogMessage() != null) {
	logMessage = historyInfo.getLogMessage();
	} else if (historyInfo.getChangePackage() != null
	&& historyInfo.getChangePackage().getLogMessage() != null) {
	logMessage = historyInfo.getChangePackage().getLogMessage();
	}
	if (logMessage != null) {
	builder.append(" ["); //$NON-NLS-1$
	builder.append(logMessage.getAuthor());
	final Date clientDate = logMessage.getClientDate();
	if (clientDate != null) {
	builder.append(" @ "); //$NON-NLS-1$
	builder.append(dateFormat.format(clientDate));
	}
	builder.append("] "); //$NON-NLS-1$
	builder.append(logMessage.getMessage());
	}
	return builder.toString();
	}

	private String getText(OperationProxy proxy) {
	if (!proxy.isLabelProviderReady()) {
	initProxy(proxy);
	}
	return proxy.getLabel();
	}

	private ImageData createImageFromProxy(OperationProxy proxy) {
	if (!proxy.isLabelProviderReady()) {
	initProxy(proxy);
	}
	final ImageProxy imageProxy = proxy.getImage();
	final ImageData imageData = new ImageData(imageProxy.getWidth(), imageProxy.getHeight(), imageProxy.getDepth(),
	createPaletteData(imageProxy), imageProxy.getScanlinePad(), imageProxy.getData());
	return imageData;
	}

	private PaletteData createPaletteData(final ImageProxy imageProxy) {
	if (imageProxy.isDirect()) {
	return new PaletteData(imageProxy.getRedMask(), imageProxy.getGreenMask(), imageProxy.getBlueMask());
	}
	final RGB[] colors = new RGB[imageProxy.getPaletteColors().length];
	for (int i = 0; i < imageProxy.getPaletteColors().length; i++) {
	final ImageProxy.RGB rgb = imageProxy.getPaletteColors()[i];
	colors[i] = new RGB(rgb.getRed(), rgb.getGreen(), rgb.getBlue());
	}
	return new PaletteData(colors);
	}

	private void initProxy(OperationProxy proxy) {
	final FileBasedChangePackage changePackage = getChangePackage(proxy);
	final AbstractOperation operation = changePackage.get(proxy.getIndex());
	prepareProxy(proxy, operation);
	}

	private ImageProxy.RGB[] createColorData(RGB[] colors) {
	ImageProxy.RGB[] result = null;
	if (colors != null) {
	result = new ImageProxy.RGB[colors.length];
	for (int i = 0; i < colors.length; i++) {
	result[i] = new ImageProxy.RGB(colors[i].red, colors[i].green, colors[i].blue);
	}
	}
	return result;
	}

	/**
	*
	* {@inheritDoc}
	*
	* @see org.eclipse.emf.emfstore.internal.client.ui.views.scm.ProxyInitializer#prepareProxy(org.eclipse.emf.emfstore.internal.server.model.versioning.OperationProxy,
	* org.eclipse.emf.emfstore.internal.server.model.versioning.operations.AbstractOperation)
	*/
	public void prepareProxy(OperationProxy proxy, AbstractOperation operation) {
	final ImageData imageData = changePackageVisualizationHelper.getImage(adapterFactoryLabelProvider, operation)
	.getImageData();
	final ImageProxy imageProxy = ImageProxy.create().setWitdh(imageData.width).setHeight(imageData.height)
	.setDepth(imageData.depth).setRedMask(imageData.palette.redMask).setGreenMask(imageData.palette.greenMask)
	.setBlueMask(imageData.palette.blueMask).setScanlinePad(imageData.scanlinePad).setData(imageData.data);
	if (!imageData.palette.isDirect) {
	imageProxy.setPaletteColors(createColorData(imageData.palette.colors));
	}
	proxy.setImage(imageProxy);
	proxy.setLabel(changePackageVisualizationHelper.getDescription(operation));

	if (CompositeOperation.class.isInstance(operation)) {
	final CompositeOperation compositeOperation = (CompositeOperation) operation;
	final EList<AbstractOperation> subOperations = compositeOperation.getSubOperations();
	final EList<OperationProxy> proxies = proxy.getProxies();

	final Iterator<AbstractOperation> subOperationsIterator = subOperations.iterator();
	final Iterator<OperationProxy> proxiesIterator = proxies.iterator();

	while (subOperationsIterator.hasNext()) {
	final AbstractOperation op = subOperationsIterator.next();
	final OperationProxy p = proxiesIterator.next();
	prepareProxy(p, op);
	}
	}
	}

	private FileBasedChangePackage getChangePackage(OperationProxy proxy) {
	return ModelUtil.getParent(FileBasedChangePackage.class, proxy);
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public Color getForeground(Object element) {

	if (element instanceof AbstractOperation) {
	final AbstractOperation operation = (AbstractOperation) element;
	if (highlighted.contains(operation.getOperationId())) {
	return Display.getCurrent().getSystemColor(SWT.COLOR_RED);
	}
	}

	return super.getForeground(element);
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public Font getFont(Object element) {

	final Font italic = JFaceResources.getFontRegistry().getItalic(
	JFaceResources.DIALOG_FONT);
	final Font bold = JFaceResources.getFontRegistry().getBold(
	JFaceResources.DIALOG_FONT);

	String text = getText(element);
	if (text == null) {
	text = StringUtils.EMPTY;
	}
	if (element instanceof HistoryInfo) {
	if (text.equals(LOCAL_REVISION)) {
	return italic;
	}
	final HistoryInfo historyInfo = (HistoryInfo) element;
	if (historyInfo.getPrimarySpec().getIdentifier() == ESWorkspaceProviderImpl
	.getProjectSpace(project).getBaseVersion().getIdentifier()) {
	return bold;
	}
	} else if (element instanceof ModelElementId) {
	if (text.equals(ELEMENT_NOT_FOUND)) {
	return italic;
	}
	} else if (element instanceof VirtualNode<?>) {
	return italic;
	}
	if (element instanceof EObject
	&& ((EObject) element).eContainer() instanceof AbstractOperation) {
	final AbstractOperation op = (AbstractOperation) ((EObject) element)
	.eContainer();
	if (element instanceof ModelElementId
	&& element.equals(op.getModelElementId())) {
	return bold;
	}

	final EObject modelElement = (EObject) element;
	final Project project = ModelUtil.getProject(modelElement);
	if (project != null
	&& project.getModelElementId(modelElement).equals(
	op.getModelElementId())) {
	return bold;
	}
	}
	return null;
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public Image getImage(Object element) {

	if (element instanceof OperationProxy) {
	final OperationProxy proxy = (OperationProxy) element;
	final ImageData imageData = createImageFromProxy(proxy);
	final Image swtImage = new Image(
	Display.getDefault(),
	imageData);
	return swtImage;
	} else if (element instanceof ModelElementId) {
	return adapterFactoryLabelProvider
	.getImage(changePackageVisualizationHelper
	.getModelElement((ModelElementId) element));
	} else if (element instanceof HistoryInfo) {
	final String text = getText(element);
	if (text.equals(LOCAL_REVISION)) {
	return currentRevision;
	}
	if (text.matches("\\[.BASE.\\].*")) { //$NON-NLS-1$
	return baseRevision;
	}
	if (text.matches("\\[.HEAD.\\].*")) { //$NON-NLS-1$
	return headRevision;
	}
	}
	if (element instanceof CompositeOperation
	&& ((CompositeOperation) element).getMainOperation() != null) {
	return changePackageVisualizationHelper.getImage(
	adapterFactoryLabelProvider,
	((CompositeOperation) element).getMainOperation());
	}

	if (element instanceof AbstractOperation) {
	return changePackageVisualizationHelper.getImage(
	adapterFactoryLabelProvider, (AbstractOperation) element);
	}

	return adapterFactoryLabelProvider.getImage(element);
	}

	/**
	* @param changePackageVisualizationHelper
	* the changePackageVisualizationHelper to set
	*/
	public void setChangePackageVisualizationHelper(
	ChangePackageVisualizationHelper changePackageVisualizationHelper) {
	this.changePackageVisualizationHelper = changePackageVisualizationHelper;
	}

	/**
	* @return the changePackageVisualizationHelper
	*/
	public ChangePackageVisualizationHelper getChangePackageVisualizationHelper() {
	return changePackageVisualizationHelper;
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public String getToolTipText(Object element) {
	final HistoryInfo historyInfo = ModelUtil.getParent(HistoryInfo.class,
	(EObject) element);
	return getText(historyInfo);
	}

	/**
	* @return the highlighted elements list.
	*/
	public List<OperationId> getHighlighted() {
	return highlighted;
	}

	/**
	*
	* {@inheritDoc}
	*
	* @see org.eclipse.jface.viewers.BaseLabelProvider#dispose()
	*/
	@Override
	public void dispose() {
	super.dispose();
	changePackageVisualizationHelper.dispose();
	headRevision.dispose();
	currentRevision.dispose();
	baseRevision.dispose();
	disposeAdapterFactories();
	}

	private void disposeAdapterFactories() {
	if (adapterFactory != null) {
	adapterFactory.dispose();
	adapterFactory = null;
	}
	if (adapterFactoryLabelProvider != null) {
	adapterFactoryLabelProvider.dispose();
	adapterFactoryLabelProvider = null;
	}
	}

	/**
	* @return The project this label provider provides labels for.
	*/
	protected Project getProject() {
	return project;
	}

	/**
	* Sets the project that is used to resolve revision numbers that are
	* possibly used within the labels.
	*
	* @param newProject
	* the project to be set
	*/
	public void setProject(Project newProject) {
	project = newProject;
	}
	}