Java tutorial
/******************************************************************************* * Copyright (c) 2004, 2007 Boeing. * 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: * Boeing - initial API and implementation *******************************************************************************/ package com.hydra.project.myplugin_nebula.xviewer; import java.util.HashMap; import java.util.Map; import java.util.logging.Level; import org.eclipse.jface.viewers.ITableColorProvider; import org.eclipse.jface.viewers.ITableLabelProvider; import com.hydra.project.myplugin_nebula.xviewer.util.internal.XViewerLog; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Image; /** * @author Donald G. Dunne */ public abstract class XViewerLabelProvider implements ITableLabelProvider, ITableColorProvider, IXViewerLabelProvider { private final XViewer viewer; // Store index of columnIndex to XViewerColumns to speed up label providing private final Map<Integer, XViewerColumn> indexToXViewerColumnMap = new HashMap<Integer, XViewerColumn>(); @Override public XViewerColumn getTreeColumnOffIndex(int columnIndex) { if (!indexToXViewerColumnMap.containsKey(columnIndex)) { XViewerColumn xViewerColumn = viewer.getXTreeColumn(columnIndex); if (xViewerColumn != null) { indexToXViewerColumnMap.put(columnIndex, xViewerColumn); } } return indexToXViewerColumnMap.get(columnIndex); } // When columns get re-ordered, need to clear out this cache so indexing can be re-computed @Override public void clearXViewerColumnIndexCache() { indexToXViewerColumnMap.clear(); } public XViewerLabelProvider(final XViewer viewer) { super(); this.viewer = viewer; } @Override public Image getColumnImage(Object element, int columnIndex) { try { XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); // If not shown, don't process any further if (!xViewerColumn.isShow()) { return null; } if (xViewerColumn instanceof IXViewerValueColumn) { Image image = ((IXViewerValueColumn) xViewerColumn).getColumnImage(element, xViewerColumn, columnIndex); if (image != null) { return image; } } return getColumnImage(element, xViewerColumn, columnIndex); } catch (Exception ex) { XViewerLog.log(Activator.class, Level.SEVERE, ex); } return null; } @Override public String getColumnText(Object element, int columnIndex) { try { XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); // If not shown, don't process any further if (!xViewerColumn.isShow()) { return ""; } // Check if Pre Computed column if (xViewerColumn instanceof IXViewerPreComputedColumn) { IXViewerPreComputedColumn preComputedColumn = (IXViewerPreComputedColumn) xViewerColumn; Long key = preComputedColumn.getKey(element); String cachedValue = xViewerColumn.getPreComputedValue(key); String result = ((IXViewerPreComputedColumn) xViewerColumn).getText(element, key, cachedValue); return result; } // First check value column's methods if (xViewerColumn instanceof IXViewerValueColumn) { String str = ((IXViewerValueColumn) xViewerColumn).getColumnText(element, xViewerColumn, columnIndex); if (str != null) { return str; } return ""; } // Return label provider's value return getColumnText(element, xViewerColumn, columnIndex); } catch (Exception ex) { return XViewerCells.getCellExceptionString(ex); } } @Override public Color getBackground(Object element, int columnIndex) { try { if (viewer.isSearch()) { String text = getColumnText(element, columnIndex); if (viewer.searchMatch(text)) { return viewer.getSearchMatchColor(); } } XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); // If not shown, don't process any further if (!xViewerColumn.isShow()) { return null; } if (xViewerColumn instanceof IXViewerValueColumn) { Color color = ((IXViewerValueColumn) xViewerColumn).getBackground(element, xViewerColumn, columnIndex); if (color != null) { return color; } } return getBackground(element, xViewerColumn, columnIndex); } catch (Exception ex) { // do nothing } return null; } @Override public Color getForeground(Object element, int columnIndex) { try { XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); // If not shown, don't process any further if (!xViewerColumn.isShow()) { return null; } if (xViewerColumn instanceof IXViewerValueColumn) { Color color = ((IXViewerValueColumn) xViewerColumn).getForeground(element, xViewerColumn, columnIndex); if (color != null) { return color; } } return getForeground(element, xViewerColumn, columnIndex); } catch (Exception ex) { // do nothing } return null; } public Color getBackground(Object element, XViewerColumn xCol, int columnIndex) { return null; } public Color getForeground(Object element, XViewerColumn xCol, int columnIndex) { return null; } public abstract Image getColumnImage(Object element, XViewerColumn xCol, int columnIndex) throws Exception; @Override public abstract String getColumnText(Object element, XViewerColumn xCol, int columnIndex) throws Exception; /** * Returns the backing data object for operations like sorting */ @Override public Object getBackingData(Object element, XViewerColumn xViewerColumn, int columnIndex) throws Exception { try { // If not shown, don't process any further if (!xViewerColumn.isShow()) { return ""; } // First check value column's methods if (xViewerColumn instanceof IXViewerValueColumn) { Object obj = ((IXViewerValueColumn) xViewerColumn).getBackingData(element, xViewerColumn, columnIndex); if (obj != null) { return obj; } } } catch (Exception ex) { return XViewerCells.getCellExceptionString(ex); } return null; } /** * Return value between 0..100 and cell will show bar graph shading that portion of the cell */ @Override public int getColumnGradient(Object element, XViewerColumn xCol, int columnIndex) throws Exception { return 0; } }