| package org.eclipse.ui.dialogs; |
| |
| /* |
| * (c) Copyright IBM Corp. 2000, 2001. |
| * All Rights Reserved. |
| */ |
| import org.eclipse.ui.IFileEditorMapping; |
| import org.eclipse.jface.viewers.*; |
| import org.eclipse.swt.graphics.Image; |
| import java.util.*; |
| |
| /** |
| * A label provider for displaying of <code>IFileEditorMapping</code> |
| * objects in viewers. |
| * <p> |
| * This class has a singleton instance, |
| * <code>FileEditorMappingLabelProvider.INSTANCE</code>, |
| * which can be used any place this kind of label provider is needed. |
| * </p> |
| * <p> |
| * The singleton instance hangs on to images, which get freed up when |
| * <code>dispose</code> is called. |
| * </p> |
| * |
| * @see org.eclipse.ui.IResourceTypeEditorMapping |
| * @see org.eclipse.jface.viewers.ILabelProvider |
| */ |
| public class FileEditorMappingLabelProvider extends LabelProvider implements ITableLabelProvider { |
| |
| /** |
| * Singleton instance accessor. |
| */ |
| public final static FileEditorMappingLabelProvider INSTANCE = new FileEditorMappingLabelProvider(); |
| |
| /** |
| * Images that will require disposal. |
| */ |
| private List imagesToDispose = new ArrayList(); |
| /** |
| * Creates an instance of this class. The private visibility of this |
| * constructor ensures that this class is only usable as a singleton. |
| */ |
| private FileEditorMappingLabelProvider() { |
| super(); |
| } |
| /* (non-Javadoc) |
| * Method declared on ILabelProvider. |
| */ |
| public void dispose() { |
| super.dispose(); |
| for (Iterator e = imagesToDispose.iterator(); e.hasNext();) { |
| ((Image) e.next()).dispose(); |
| } |
| imagesToDispose.clear(); |
| } |
| /** |
| * The <code>ResourceTypeEditorMappingLabelProvider</code> implementation of this |
| * <code>ITableLabelProvider</code> method creates and returns an new image. The |
| * image is remembered internally and will be deallocated by |
| * <code>dispose</code>. |
| */ |
| public Image getColumnImage(Object element, int row) { |
| return getImage(element); |
| } |
| /* (non-Javadoc) |
| * Method declared on ITableLabelProvider. |
| */ |
| public String getColumnText(Object element, int row) { |
| return getText(element); |
| } |
| /** |
| * The <code>ResourceTypeEditorMappingLabelProvider</code> implementation of this |
| * <code>ILabelProvider</code> method creates and returns an new image. The image |
| * is remembered internally and will be deallocated by <code>dispose</code>. |
| */ |
| public Image getImage(Object element) { |
| if (element instanceof IFileEditorMapping) { |
| Image image = ((IFileEditorMapping)element).getImageDescriptor().createImage(); |
| imagesToDispose.add(image); |
| return image; |
| } |
| return null; |
| } |
| /* (non-Javadoc) |
| * Method declared on ILabelProvider. |
| */ |
| public String getText(Object element) { |
| if (element instanceof IFileEditorMapping) |
| return ((IFileEditorMapping)element).getLabel(); |
| |
| return null; |
| } |
| } |