/*******************************************************************************
 * Copyright (c) 2004, 2007 QNX Software Systems 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:
 * QNX Software Systems - Initial API and implementation
 * Ken Ryall (Nokia) - Added support for CSourceNotFoundElement ( 167305 )
 * ARM Limited - https://bugs.eclipse.org/bugs/show_bug.cgi?id=186981
 * Ken Ryall (Nokia) - Bug 201165 don't toss images on dispose.
 *******************************************************************************/
package org.eclipse.cdt.debug.internal.ui;

import java.io.File;
import java.text.MessageFormat;
import java.util.HashMap;

import org.eclipse.cdt.core.IAddress;
import org.eclipse.cdt.core.resources.FileStorage;
import org.eclipse.cdt.debug.core.CDebugCorePlugin;
import org.eclipse.cdt.debug.core.CDebugUtils;
import org.eclipse.cdt.debug.core.cdi.ICDIBreakpointHit;
import org.eclipse.cdt.debug.core.cdi.ICDIExitInfo;
import org.eclipse.cdt.debug.core.cdi.ICDISharedLibraryEvent;
import org.eclipse.cdt.debug.core.cdi.ICDISignalExitInfo;
import org.eclipse.cdt.debug.core.cdi.ICDISignalReceived;
import org.eclipse.cdt.debug.core.cdi.ICDIWatchpointScope;
import org.eclipse.cdt.debug.core.cdi.ICDIWatchpointTrigger;
import org.eclipse.cdt.debug.core.cdi.model.ICDISignal;
import org.eclipse.cdt.debug.core.model.CDebugElementState;
import org.eclipse.cdt.debug.core.model.ICAddressBreakpoint;
import org.eclipse.cdt.debug.core.model.ICBreakpoint;
import org.eclipse.cdt.debug.core.model.ICDebugElement;
import org.eclipse.cdt.debug.core.model.ICDebugElementStatus;
import org.eclipse.cdt.debug.core.model.ICDebugTarget;
import org.eclipse.cdt.debug.core.model.ICFunctionBreakpoint;
import org.eclipse.cdt.debug.core.model.ICGlobalVariable;
import org.eclipse.cdt.debug.core.model.ICLineBreakpoint;
import org.eclipse.cdt.debug.core.model.ICModule;
import org.eclipse.cdt.debug.core.model.ICSignal;
import org.eclipse.cdt.debug.core.model.ICStackFrame;
import org.eclipse.cdt.debug.core.model.ICThread;
import org.eclipse.cdt.debug.core.model.ICType;
import org.eclipse.cdt.debug.core.model.ICValue;
import org.eclipse.cdt.debug.core.model.ICVariable;
import org.eclipse.cdt.debug.core.model.ICWatchpoint;
import org.eclipse.cdt.debug.core.model.IDummyStackFrame;
import org.eclipse.cdt.debug.core.model.IEnableDisableTarget;
import org.eclipse.cdt.debug.internal.core.sourcelookup.CSourceNotFoundElement;
import org.eclipse.cdt.debug.internal.ui.sourcelookup.CSourceNotFoundEditorInput;
import org.eclipse.cdt.debug.ui.CDebugUIPlugin;
import org.eclipse.cdt.debug.ui.ICDebugUIConstants;
import org.eclipse.cdt.internal.core.model.ExternalTranslationUnit;
import org.eclipse.cdt.internal.ui.util.ExternalEditorInput;
import org.eclipse.cdt.ui.CUIPlugin;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IStorage;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.model.IBreakpoint;
import org.eclipse.debug.core.model.IDebugTarget;
import org.eclipse.debug.core.model.IDisconnect;
import org.eclipse.debug.core.model.IExpression;
import org.eclipse.debug.core.model.IRegister;
import org.eclipse.debug.core.model.IRegisterGroup;
import org.eclipse.debug.core.model.IStackFrame;
import org.eclipse.debug.core.model.ITerminate;
import org.eclipse.debug.core.model.IThread;
import org.eclipse.debug.core.model.IValue;
import org.eclipse.debug.core.model.IVariable;
import org.eclipse.debug.core.model.IWatchExpression;
import org.eclipse.debug.core.sourcelookup.containers.LocalFileStorage;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.IDebugModelPresentation;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.debug.ui.IValueDetailListener;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.IEditorDescriptor;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorRegistry;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.FileEditorInput;

/**
 * @see IDebugModelPresentation
 */
public class CDebugModelPresentation extends LabelProvider implements IDebugModelPresentation {

	public final static String DISPLAY_FULL_PATHS = "DISPLAY_FULL_PATHS"; //$NON-NLS-1$

	private static final String DUMMY_STACKFRAME_LABEL = "..."; //$NON-NLS-1$

	protected HashMap fAttributes = new HashMap( 3 );

	protected CDebugImageDescriptorRegistry fDebugImageRegistry = CDebugUIPlugin.getImageDescriptorRegistry();

	private OverlayImageCache fImageCache = new OverlayImageCache();
	
	private static CDebugModelPresentation gfInstance = null;

	public static CDebugModelPresentation getDefault() {
		if ( gfInstance == null )
			gfInstance = new CDebugModelPresentation();
		return gfInstance;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.ui.IDebugModelPresentation#setAttribute(java.lang.String, java.lang.Object)
	 */
	public void setAttribute( String attribute, Object value ) {
		if ( value == null )
			return;
		getAttributes().put( attribute, value );
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.ui.IDebugModelPresentation#computeDetail(org.eclipse.debug.core.model.IValue, org.eclipse.debug.ui.IValueDetailListener)
	 */
	public void computeDetail( IValue value, IValueDetailListener listener ) {
		CValueDetailProvider.getDefault().computeDetail( value, listener );
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.ui.ISourcePresentation#getEditorInput(java.lang.Object)
	 */
	public IEditorInput getEditorInput( Object element ) {
		if ( element instanceof IMarker ) {
			IResource resource = ((IMarker)element).getResource();
			if ( resource instanceof IFile )
				return new FileEditorInput( (IFile)resource );
		}
		if ( element instanceof IFile ) {
			return new FileEditorInput( (IFile)element );
		}
		if ( element instanceof ICBreakpoint ) {
			ICBreakpoint b = (ICBreakpoint)element;
			IFile file = null;
			try {
				String handle = b.getSourceHandle();
				if ( handle != null ) {
					IPath path = new Path( handle );
					if ( path.isValidPath( handle ) ) {
						IFile[] files = ResourcesPlugin.getWorkspace().getRoot().findFilesForLocation( path );
						if ( files.length > 0 ) {
							file = files[0];
						}
						else {
							File fsfile = new File( handle );
							if ( fsfile.isFile() && fsfile.exists() ) {
								return new ExternalEditorInput( new LocalFileStorage( fsfile ) );
							}
						}
					}
				}
			}
			catch( CoreException e ) {
			}
			if ( file == null )
				file = (IFile)b.getMarker().getResource().getAdapter( IFile.class );
			if ( file != null )
				return new FileEditorInput( file );
		}
		if ( element instanceof FileStorage || element instanceof LocalFileStorage ) {
			return new ExternalEditorInput( (IStorage)element );
		}
		if ( element instanceof ExternalTranslationUnit ) {
			ExternalTranslationUnit etu = (ExternalTranslationUnit) element;
			return new ExternalEditorInput( etu , new LocalFileStorage( etu.getPath().toFile() ) );
		}
		if (element instanceof CSourceNotFoundElement)
		{
			return new CSourceNotFoundEditorInput((CSourceNotFoundElement) element);
		}
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.ui.ISourcePresentation#getEditorId(org.eclipse.ui.IEditorInput, java.lang.Object)
	 */
	public String getEditorId( IEditorInput input, Object element ) {
		if (element instanceof CSourceNotFoundElement)
			return ICDebugUIConstants.CSOURCENOTFOUND_EDITOR_ID;
		String id = null;
		if ( input != null ) {
			IEditorRegistry registry = PlatformUI.getWorkbench().getEditorRegistry();
			IEditorDescriptor descriptor = registry.getDefaultEditor( input.getName() );
			id = (descriptor != null) ? descriptor.getId() : CUIPlugin.EDITOR_ID;
		}
		return id;
	}

	public Image getImage( Object element ) {
		Image baseImage = getBaseImage( element );
		if ( baseImage != null ) {
			ImageDescriptor[] overlays = new ImageDescriptor[]{ null, null, null, null };
			if ( element instanceof ICDebugElementStatus && !((ICDebugElementStatus)element).isOK() ) {
				switch( ((ICDebugElementStatus)element).getSeverity() ) {
					case ICDebugElementStatus.WARNING:
						overlays[OverlayImageDescriptor.BOTTOM_LEFT] = CDebugImages.DESC_OVRS_WARNING;
						break;
					case ICDebugElementStatus.ERROR:
						overlays[OverlayImageDescriptor.BOTTOM_LEFT] = CDebugImages.DESC_OVRS_ERROR;
						break;
				}
			}
			if ( element instanceof IWatchExpression && ((IWatchExpression)element).hasErrors() )
				overlays[OverlayImageDescriptor.BOTTOM_LEFT] = CDebugImages.DESC_OVRS_ERROR;
			if ( element instanceof ICVariable && ((ICVariable)element).isArgument() )
				overlays[OverlayImageDescriptor.TOP_RIGHT] = CDebugImages.DESC_OVRS_ARGUMENT;
			if ( element instanceof ICGlobalVariable && !(element instanceof IRegister) )
				overlays[OverlayImageDescriptor.TOP_RIGHT] = CDebugImages.DESC_OVRS_GLOBAL;
			return getImageCache().getImageFor( new OverlayImageDescriptor( baseImage, overlays ) );
		}
		return null;
	}

	private Image getBaseImage( Object element ) {
		if ( element instanceof ICDebugTarget ) {
			ICDebugTarget target = (ICDebugTarget)element;
			if ( target.isPostMortem() ) {
				return fDebugImageRegistry.get( DebugUITools.getImageDescriptor( IDebugUIConstants.IMG_OBJS_DEBUG_TARGET_TERMINATED ) );
			}
			if ( target.isTerminated() || target.isDisconnected() ) {
				return fDebugImageRegistry.get( DebugUITools.getImageDescriptor( IDebugUIConstants.IMG_OBJS_DEBUG_TARGET_TERMINATED ) );
			}
			return fDebugImageRegistry.get( DebugUITools.getImageDescriptor( IDebugUIConstants.IMG_OBJS_DEBUG_TARGET ) );
		}
		if ( element instanceof ICThread ) {
			ICThread thread = (ICThread)element;
			ICDebugTarget target = (ICDebugTarget)thread.getDebugTarget();
			if ( target.isPostMortem() ) {
				return fDebugImageRegistry.get( DebugUITools.getImageDescriptor( IDebugUIConstants.IMG_OBJS_THREAD_TERMINATED ) );
			}
			if ( thread.isSuspended() ) {
				return fDebugImageRegistry.get( DebugUITools.getImageDescriptor( IDebugUIConstants.IMG_OBJS_THREAD_SUSPENDED ) );
			}
			else if ( thread.isTerminated() ) {
				return fDebugImageRegistry.get( DebugUITools.getImageDescriptor( IDebugUIConstants.IMG_OBJS_THREAD_TERMINATED ) );
			}
			else {
				return fDebugImageRegistry.get( DebugUITools.getImageDescriptor( IDebugUIConstants.IMG_OBJS_THREAD_RUNNING ) );
			}
		}
		if ( element instanceof IMarker ) {
			IBreakpoint bp = getBreakpoint( (IMarker)element );
			if ( bp != null && bp instanceof ICBreakpoint ) {
				return getBreakpointImage( (ICBreakpoint)bp );
			}
		}
		if ( element instanceof ICBreakpoint ) {
			return getBreakpointImage( (ICBreakpoint)element );
		}
		if ( element instanceof IRegisterGroup ) {
			return getRegisterGroupImage( (IRegisterGroup)element );
		}
		if ( element instanceof IExpression ) {
			return getExpressionImage( (IExpression)element );
		}
		if ( element instanceof IRegister ) {
			return getRegisterImage( (IRegister)element );
		}
		if ( element instanceof IVariable ) {
			return getVariableImage( (IVariable)element );
		}
		if ( element instanceof ICModule ) {
			return getModuleImage( (ICModule)element );
		}
		if ( element instanceof ICSignal ) {
			return getSignalImage( (ICSignal)element );
		}
		return super.getImage( element );
	}

	protected Image getSignalImage( ICSignal signal ) {
		return CDebugUIPlugin.getImageDescriptorRegistry().get( CDebugImages.DESC_OBJS_SIGNAL );
	}

	protected Image getRegisterGroupImage( IRegisterGroup element ) {
		IEnableDisableTarget target = (IEnableDisableTarget)element.getAdapter( IEnableDisableTarget.class );
		if ( target != null && !target.isEnabled() )
			return fDebugImageRegistry.get( CDebugImages.DESC_OBJS_REGISTER_GROUP_DISABLED );
		return fDebugImageRegistry.get( CDebugImages.DESC_OBJS_REGISTER_GROUP );
	}

	protected Image getBreakpointImage( ICBreakpoint breakpoint ) {
		try {
			if ( breakpoint instanceof ICLineBreakpoint ) {
				return getLineBreakpointImage( (ICLineBreakpoint)breakpoint );
			}
			if ( breakpoint instanceof ICWatchpoint ) {
				return getWatchpointImage( (ICWatchpoint)breakpoint );
			}
		}
		catch( CoreException e ) {
		}
		return null;
	}

	protected Image getLineBreakpointImage( ICLineBreakpoint breakpoint ) throws CoreException {
		ImageDescriptor descriptor = null;
		if ( breakpoint.isEnabled() ) {
			descriptor = CDebugImages.DESC_OBJS_BREAKPOINT_ENABLED;
		}
		else {
			descriptor = CDebugImages.DESC_OBJS_BREAKPOINT_DISABLED;
		}
		return getImageCache().getImageFor( new OverlayImageDescriptor( fDebugImageRegistry.get( descriptor ), computeBreakpointOverlays( breakpoint ) ) );
	}

	protected Image getWatchpointImage( ICWatchpoint watchpoint ) throws CoreException {
		ImageDescriptor descriptor = null;
		if ( watchpoint.isEnabled() ) {
			if ( watchpoint.isReadType() && !watchpoint.isWriteType() )
				descriptor = CDebugImages.DESC_OBJS_READ_WATCHPOINT_ENABLED;
			else if ( !watchpoint.isReadType() && watchpoint.isWriteType() )
				descriptor = CDebugImages.DESC_OBJS_WRITE_WATCHPOINT_ENABLED;
			else
				descriptor = CDebugImages.DESC_OBJS_WATCHPOINT_ENABLED;
		}
		else {
			if ( watchpoint.isReadType() && !watchpoint.isWriteType() )
				descriptor = CDebugImages.DESC_OBJS_READ_WATCHPOINT_DISABLED;
			else if ( !watchpoint.isReadType() && watchpoint.isWriteType() )
				descriptor = CDebugImages.DESC_OBJS_WRITE_WATCHPOINT_DISABLED;
			else
				descriptor = CDebugImages.DESC_OBJS_WATCHPOINT_DISABLED;
		}
		return getImageCache().getImageFor( new OverlayImageDescriptor( fDebugImageRegistry.get( descriptor ), computeBreakpointOverlays( watchpoint ) ) );
	}

	public String getText( Object element ) {
		String bt = getBaseText( element );
		if ( bt == null )
			return null;
		return CDebugUIUtils.decorateText( element, bt );
	}

	private String getBaseText( Object element ) {
		boolean showQualified = isShowQualifiedNames();
		StringBuffer label = new StringBuffer();
		try {
			if ( element instanceof ICModule ) {
				label.append( getModuleText( (ICModule)element, showQualified ) );
				return label.toString();
			}
			if ( element instanceof ICSignal ) {
				label.append( getSignalText( (ICSignal)element ) );
				return label.toString();
			}
			if ( element instanceof IRegisterGroup ) {
				label.append( ((IRegisterGroup)element).getName() );
				return label.toString();
			}
			if ( element instanceof IWatchExpression ) {
				return getWatchExpressionText( (IWatchExpression)element );
			}
			if ( element instanceof IVariable ) {
				label.append( getVariableText( (IVariable)element ) );
				return label.toString();
			}
			if ( element instanceof IValue ) {
				label.append( getValueText( (IValue)element ) );
				return label.toString();
			}
			if ( element instanceof IStackFrame ) {
				label.append( getStackFrameText( (IStackFrame)element, showQualified ) );
				return label.toString();
			}
			if ( element instanceof CSourceNotFoundElement ) {
				return getBaseText(((CSourceNotFoundElement)element).getElement());
			}
			if ( element instanceof IMarker ) {
				IBreakpoint breakpoint = getBreakpoint( (IMarker)element );
				if ( breakpoint != null ) {
					return CDebugUtils.getBreakpointText( breakpoint, showQualified );
				}
				return null;
			}
			if ( element instanceof IBreakpoint ) {
				return CDebugUtils.getBreakpointText( (IBreakpoint)element, showQualified );
			}
			if ( element instanceof IDebugTarget )
				label.append( getTargetText( (IDebugTarget)element, showQualified ) );
			else if ( element instanceof IThread )
				label.append( getThreadText( (IThread)element, showQualified ) );
			if ( element instanceof ITerminate ) {
				if ( ((ITerminate)element).isTerminated() ) {
					label.insert( 0, CDebugUIMessages.getString( "CDTDebugModelPresentation.0" ) ); //$NON-NLS-1$
					return label.toString();
				}
			}
			if ( element instanceof IDisconnect ) {
				if ( ((IDisconnect)element).isDisconnected() ) {
					label.insert( 0, CDebugUIMessages.getString( "CDTDebugModelPresentation.1" ) ); //$NON-NLS-1$
					return label.toString();
				}
			}
			if ( label.length() > 0 ) {
				return label.toString();
			}
		}
		catch( DebugException e ) {
			return MessageFormat.format( CDebugUIMessages.getString( "CDTDebugModelPresentation.2" ), new String[] { e.getMessage() } ); //$NON-NLS-1$
		}
		catch( CoreException e ) {
			CDebugUIPlugin.log( e );
		}
		return null;
	}

	protected String getModuleText( ICModule module, boolean qualified ) {
		StringBuffer sb = new StringBuffer();
		IPath path = module.getImageName();
		if ( !path.isEmpty() ) {
			sb.append( path.lastSegment() );
		}
		else {
			sb.append( CDebugUIMessages.getString( "CDebugModelPresentation.unknown_1" ) ); //$NON-NLS-1$		
		}
		return sb.toString();
	}

	protected String getRegisterGroupText( IRegisterGroup group ) {
		String name = CDebugUIMessages.getString( "CDebugModelPresentation.not_available_1" ); //$NON-NLS-1$
		try {
			name = group.getName();
		}
		catch( DebugException e ) {
			CDebugUIPlugin.log( e.getStatus() );
		}
		return name;
	}

	protected boolean isShowQualifiedNames() {
		Boolean showQualified = (Boolean)getAttributes().get( DISPLAY_FULL_PATHS );
		showQualified = showQualified == null ? Boolean.FALSE : showQualified;
		return showQualified.booleanValue();
	}

	private HashMap getAttributes() {
		return this.fAttributes;
	}

	private OverlayImageCache getImageCache() {
		return this.fImageCache;
	}

	private boolean isEmpty( String string ) {
		return ( string == null || string.trim().length() == 0 );
	}

	protected IBreakpoint getBreakpoint( IMarker marker ) {
		return DebugPlugin.getDefault().getBreakpointManager().getBreakpoint( marker );
	}

	private ImageDescriptor[] computeBreakpointOverlays( ICBreakpoint breakpoint ) {
		ImageDescriptor[] overlays = new ImageDescriptor[]{ null, null, null, null };
		try {
			if ( CDebugCorePlugin.getDefault().getBreakpointActionManager().breakpointHasActions(breakpoint) ) {
				overlays[OverlayImageDescriptor.BOTTOM_RIGHT] = (breakpoint.isEnabled()) ? CDebugImages.DESC_OVRS_BREAKPOINT_WITH_ACTIONS : CDebugImages.DESC_OVRS_BREAKPOINT_WITH_ACTIONS_DISABLED;
			}
			if ( breakpoint.isConditional() ) {
				overlays[OverlayImageDescriptor.TOP_LEFT] = (breakpoint.isEnabled()) ? CDebugImages.DESC_OVRS_BREAKPOINT_CONDITIONAL : CDebugImages.DESC_OVRS_BREAKPOINT_CONDITIONAL_DISABLED;
			}
			if ( breakpoint.isInstalled() ) {
				overlays[OverlayImageDescriptor.BOTTOM_LEFT] = (breakpoint.isEnabled()) ? CDebugImages.DESC_OVRS_BREAKPOINT_INSTALLED : CDebugImages.DESC_OVRS_BREAKPOINT_INSTALLED_DISABLED;
			}
			if ( breakpoint instanceof ICAddressBreakpoint ) {
				overlays[OverlayImageDescriptor.TOP_RIGHT] = (breakpoint.isEnabled()) ? CDebugImages.DESC_OVRS_ADDRESS_BREAKPOINT : CDebugImages.DESC_OVRS_ADDRESS_BREAKPOINT_DISABLED;
			}
			if ( breakpoint instanceof ICFunctionBreakpoint ) {
				overlays[OverlayImageDescriptor.TOP_RIGHT] = (breakpoint.isEnabled()) ? CDebugImages.DESC_OVRS_FUNCTION_BREAKPOINT : CDebugImages.DESC_OVRS_FUNCTION_BREAKPOINT_DISABLED;
			}
		}
		catch( CoreException e ) {
			CDebugUIPlugin.log( e );
		}
		return overlays;
	}


	protected Image getVariableImage( IVariable element ) {
		if ( element instanceof ICVariable ) {
			ICType type = null;
			try {
				type = ((ICVariable)element).getType();
			}
			catch( DebugException e ) {
				// use default image
			}
			if ( type != null && (type.isPointer() || type.isReference()) )
				return fDebugImageRegistry.get( (((ICVariable)element).isEnabled()) ? CDebugImages.DESC_OBJS_VARIABLE_POINTER : CDebugImages.DESC_OBJS_VARIABLE_POINTER_DISABLED );
			else if ( type != null && (type.isArray() || type.isStructure()) )
				return fDebugImageRegistry.get( (((ICVariable)element).isEnabled()) ? CDebugImages.DESC_OBJS_VARIABLE_AGGREGATE : CDebugImages.DESC_OBJS_VARIABLE_AGGREGATE_DISABLED );
			else
				return fDebugImageRegistry.get( (((ICVariable)element).isEnabled()) ? CDebugImages.DESC_OBJS_VARIABLE_SIMPLE : CDebugImages.DESC_OBJS_VARIABLE_SIMPLE_DISABLED );
		}
		return null;
	}

	protected Image getRegisterImage( IRegister element ) {
		return ( ( element instanceof ICVariable && ((ICVariable)element).isEnabled() ) ) ? fDebugImageRegistry.get( CDebugImages.DESC_OBJS_REGISTER ) : fDebugImageRegistry.get( CDebugImages.DESC_OBJS_REGISTER_DISABLED );
	}

	protected Image getExpressionImage( IExpression element ) {
		return fDebugImageRegistry.get( DebugUITools.getImageDescriptor( IDebugUIConstants.IMG_OBJS_EXPRESSION ) );
	}

	protected Image getModuleImage( ICModule element ) {
		switch( element.getType() ) {
			case ICModule.EXECUTABLE:
				if ( element.areSymbolsLoaded() ) {
					return CDebugUIPlugin.getImageDescriptorRegistry().get( CDebugImages.DESC_OBJS_EXECUTABLE_WITH_SYMBOLS );
				}
				return CDebugUIPlugin.getImageDescriptorRegistry().get( CDebugImages.DESC_OBJS_EXECUTABLE );
			case ICModule.SHARED_LIBRARY:
				if ( element.areSymbolsLoaded() ) {
					return CDebugUIPlugin.getImageDescriptorRegistry().get( CDebugImages.DESC_OBJS_SHARED_LIBRARY_WITH_SYMBOLS );
				}
				return CDebugUIPlugin.getImageDescriptorRegistry().get( CDebugImages.DESC_OBJS_SHARED_LIBRARY );
		}
		return null;
	}

	protected String getVariableText( IVariable var ) throws DebugException {
		StringBuffer label = new StringBuffer();
		if ( var instanceof ICVariable ) {
			ICType type = null;
			try {
				type = ((ICVariable)var).getType();
			}
			catch( DebugException e ) {
				// don't display type
			}
			if ( type != null && isShowVariableTypeNames() ) {
				String typeName = CDebugUIUtils.getVariableTypeName( type );
				if ( typeName != null && typeName.length() > 0 ) {
					label.append( typeName ).append( ' ' );
				}
			}
			String name = var.getName();
			if ( name != null )
				label.append( name.trim() );
			String valueString = getValueText( var.getValue() );
			if ( !isEmpty( valueString ) ) {
				label.append( " = " ); //$NON-NLS-1$
				label.append( valueString );
			}
		}
		return label.toString();
	}

	protected String getValueText( IValue value ) {
		return CDebugUIUtils.getValueText( value );
	}

	protected String getSignalText( ICSignal signal ) {
		StringBuffer sb = new StringBuffer( CDebugUIMessages.getString( "CDTDebugModelPresentation.12" ) ); //$NON-NLS-1$
		try {
			String name = signal.getName();
			sb.append( " \'" ).append( name ).append( '\'' ); //$NON-NLS-1$
		}
		catch( DebugException e ) {
		}
		return sb.toString();
	}

	protected String getWatchExpressionText( IWatchExpression expression ) {
		StringBuffer result = new StringBuffer();
		result.append( '"' ).append( expression.getExpressionText() ).append( '"' );
		if ( expression.isPending() ) {
			result.append( " = " ).append( "..." ); //$NON-NLS-1$//$NON-NLS-2$
		}
		else {
			IValue value = expression.getValue();
			if ( value instanceof ICValue ) {
				ICType type = null;
				try {
					type = ((ICValue)value).getType();
				}
				catch( DebugException e1 ) {
				}
				if ( type != null && isShowVariableTypeNames() ) {
					String typeName = CDebugUIUtils.getVariableTypeName( type );
					if ( !isEmpty( typeName ) ) {
						result.insert( 0, typeName + ' ' );
					}
				}
				if ( expression.isEnabled() ) {
					String valueString = getValueText( value );
					if ( valueString.length() > 0 ) {
						result.append( " = " ).append( valueString ); //$NON-NLS-1$
					}
				}
			}
		}
		if ( !expression.isEnabled() ) {
			result.append( ' ' );
			result.append( CDebugUIMessages.getString( "CDTDebugModelPresentation.22" ) ); //$NON-NLS-1$
		}
		return result.toString();
	}

	protected String getTargetText( IDebugTarget target, boolean qualified ) throws DebugException {
		ICDebugTarget t = (ICDebugTarget)target.getAdapter( ICDebugTarget.class );
		if ( t != null ) {
			if ( !t.isPostMortem() ) {
				CDebugElementState state = t.getState();
				if ( state.equals( CDebugElementState.EXITED ) ) {
					Object info = t.getCurrentStateInfo();
					String label = CDebugUIMessages.getString( "CDTDebugModelPresentation.3" ); //$NON-NLS-1$
					String reason = ""; //$NON-NLS-1$
					if ( info != null && info instanceof ICDISignalExitInfo ) {
						ICDISignalExitInfo sigInfo = (ICDISignalExitInfo)info;
						reason = ' ' + MessageFormat.format( CDebugUIMessages.getString( "CDTDebugModelPresentation.5" ), new String[]{ sigInfo.getName(), sigInfo.getDescription() } ); //$NON-NLS-1$
					}
					else if ( info != null && info instanceof ICDIExitInfo ) {
						reason = ' ' + MessageFormat.format( CDebugUIMessages.getString( "CDTDebugModelPresentation.6" ), new Integer[] { new Integer( ((ICDIExitInfo)info).getCode() ) } ); //$NON-NLS-1$
					}
					return MessageFormat.format( label, new String[] { target.getName(), reason } );
				}
				else if ( state.equals( CDebugElementState.SUSPENDED ) ) {
						return MessageFormat.format( CDebugUIMessages.getString( "CDTDebugModelPresentation.7" ), new String[] { target.getName() } ); //$NON-NLS-1$
				}
			}
		}
		return target.getName();
	}

	protected String getThreadText( IThread thread, boolean qualified ) throws DebugException {
		ICDebugTarget target = (ICDebugTarget)thread.getDebugTarget().getAdapter( ICDebugTarget.class );
		if ( target.isPostMortem() ) {
			return getFormattedString( CDebugUIMessages.getString( "CDTDebugModelPresentation.8" ), thread.getName() ); //$NON-NLS-1$
		}
		if ( thread.isTerminated() ) {
			return getFormattedString( CDebugUIMessages.getString( "CDTDebugModelPresentation.9" ), thread.getName() ); //$NON-NLS-1$
		}
		if ( thread.isStepping() ) {
			return getFormattedString( CDebugUIMessages.getString( "CDTDebugModelPresentation.10" ), thread.getName() ); //$NON-NLS-1$
		}
		if ( !thread.isSuspended() ) {
			return getFormattedString( CDebugUIMessages.getString( "CDTDebugModelPresentation.11" ), thread.getName() ); //$NON-NLS-1$
		}
		if ( thread.isSuspended() ) {
			String reason = ""; //$NON-NLS-1$
			ICDebugElement element = (ICDebugElement)thread.getAdapter( ICDebugElement.class );
			if ( element != null ) {
				Object info = element.getCurrentStateInfo();
				if ( info != null && info instanceof ICDISignalReceived ) {
					ICDISignal signal = ((ICDISignalReceived)info).getSignal();
					reason = MessageFormat.format( CDebugUIMessages.getString( "CDTDebugModelPresentation.13" ), new String[]{ signal.getName(), signal.getDescription() } ); //$NON-NLS-1$
				}
				else if ( info != null && info instanceof ICDIWatchpointTrigger ) {
					reason = MessageFormat.format( CDebugUIMessages.getString( "CDTDebugModelPresentation.14" ), new String[]{ ((ICDIWatchpointTrigger)info).getOldValue(), ((ICDIWatchpointTrigger)info).getNewValue() } ); //$NON-NLS-1$
				}
				else if ( info != null && info instanceof ICDIWatchpointScope ) {
					reason = CDebugUIMessages.getString( "CDTDebugModelPresentation.15" ); //$NON-NLS-1$
				}
				else if ( info != null && info instanceof ICDIBreakpointHit ) {
					reason = CDebugUIMessages.getString( "CDTDebugModelPresentation.16" ); //$NON-NLS-1$
				}
				else if ( info != null && info instanceof ICDISharedLibraryEvent ) {
					reason = CDebugUIMessages.getString( "CDTDebugModelPresentation.17" ); //$NON-NLS-1$
				}
			}
			return MessageFormat.format( CDebugUIMessages.getString( "CDTDebugModelPresentation.18" ), new String[] { thread.getName(), reason } ); //$NON-NLS-1$
		}
		return MessageFormat.format( CDebugUIMessages.getString( "CDTDebugModelPresentation.19" ), new String[] { thread.getName() } ); //$NON-NLS-1$
	}

	protected String getStackFrameText( IStackFrame f, boolean qualified ) throws DebugException {
		if ( f instanceof ICStackFrame ) {
			ICStackFrame frame = (ICStackFrame)f;
			StringBuffer label = new StringBuffer();
			label.append( frame.getLevel() );
			label.append( ' ' );
			String function = frame.getFunction();
			if ( isEmpty( function ) ) {
				label.append( CDebugUIMessages.getString( "CDTDebugModelPresentation.21" ) ); //$NON-NLS-1$
			}
			else {
				function = function.trim();
				label.append( function );
				label.append( "() " ); //$NON-NLS-1$
				if ( frame.getFile() != null ) {
					IPath path = new Path( frame.getFile() );
					if ( !path.isEmpty() ) {
						label.append( (qualified ? path.toOSString() : path.lastSegment()) );
						label.append( ':' );
						if ( frame.getFrameLineNumber() != 0 )
							label.append( frame.getFrameLineNumber() );
					}
				}
			}
			IAddress address = frame.getAddress();
			if ( address != null ) {
				label.append( ' ' );
				label.append( address.toHexAddressString() );
			}
			return label.toString();
		}
		return (f.getAdapter( IDummyStackFrame.class ) != null) ? getDummyStackFrameLabel( f ) : f.getName();
	}

	private String getDummyStackFrameLabel( IStackFrame stackFrame ) {
		return DUMMY_STACKFRAME_LABEL;
	}

	protected boolean isShowVariableTypeNames() {
		Boolean show = (Boolean)fAttributes.get( DISPLAY_VARIABLE_TYPE_NAMES );
		show = show == null ? Boolean.FALSE : show;
		return show.booleanValue();
	}

	public static String getFormattedString( String key, String arg ) {
		return getFormattedString( key, new String[]{ arg } );
	}

	public static String getFormattedString( String string, String[] args ) {
		return MessageFormat.format( string, args );
	}

}
