plugins/org.argeo.slc.client.ui.dist/src/main/java/org/argeo/slc/client/ui/dist/utils/ArtifactsTableConfigurer.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.slc.client.ui.dist.utils;
  17
  18 import java.text.DateFormat;
  19 import java.text.SimpleDateFormat;
  20 import java.util.HashMap;
  21 import java.util.Map;
  22
  23 import javax.jcr.PropertyType;
  24 import javax.jcr.RepositoryException;
  25 import javax.jcr.Value;
  26 import javax.jcr.query.Row;
  27
  28 import org.argeo.ArgeoException;
  29 import org.argeo.eclipse.ui.GenericTableComparator;
  30 import org.argeo.slc.client.ui.dist.DistConstants;
  31 import org.argeo.slc.jcr.SlcNames;
  32 import org.argeo.slc.jcr.SlcTypes;
  33 import org.eclipse.jface.viewers.ColumnLabelProvider;
  34 import org.eclipse.jface.viewers.TableViewer;
  35 import org.eclipse.jface.viewers.TableViewerColumn;
  36 import org.eclipse.jface.viewers.Viewer;
  37 import org.eclipse.swt.SWT;
  38 import org.eclipse.swt.events.SelectionAdapter;
  39 import org.eclipse.swt.events.SelectionEvent;
  40 import org.eclipse.swt.graphics.Image;
  41 import org.eclipse.swt.widgets.TableColumn;
  42
  43 /**
  44  * Centralizes and factorizes useful methods to create and manage tables that
  45  * display artifacts for both editors and views.
  46  */
  47 public class ArtifactsTableConfigurer implements SlcNames, SlcTypes,
  48                 DistConstants {
  49         // private final static Log log = LogFactory
  50         // .getLog(ArtifactsTableConfigurer.class);
  51         // Used in the comparator to be able to retrieve the value from a row
  52         // knowing the corresponding column index.
  53         private Map<Integer, String> indexToName = new HashMap<Integer, String>();
  54
  55         private CurrentTableComparator comparator;
  56         private TableViewer viewer;
  57
  58         protected DateFormat timeFormatter = new SimpleDateFormat(DATE_TIME_FORMAT);
  59
  60         /**
  61          * Create and initialize the table configurer.
  62          */
  63         public ArtifactsTableConfigurer(TableViewer viewer,
  64                         int defaultSortColumnIndex, int direction) {
  65                 this.viewer = viewer;
  66                 comparator = new CurrentTableComparator(defaultSortColumnIndex,
  67                                 direction);
  68         }
  69
  70         public GenericTableComparator getComparator() {
  71                 return comparator;
  72         }
  73
  74         /**
  75          * Configure column width and header label depending on the value that will
  76          * be displayed in the current column.
  77          *
  78          * @param jcrColumnName
  79          * @param column
  80          * @param columnIndex
  81          */
  82         public void configureColumn(String jcrColumnName, TableViewerColumn column,
  83                         int columnIndex) {
  84
  85                 if (columnIndex != -1
  86                                 && getSelectionAdapter(column.getColumn(), columnIndex) != null) {
  87                         column.getColumn().addSelectionListener(
  88                                         getSelectionAdapter(column.getColumn(), columnIndex));
  89                         indexToName.put(new Integer(columnIndex), jcrColumnName);
  90                 }
  91                 Object[] objs = DistUiHelpers
  92                                 .getLabelAndDefaultValueWidth(jcrColumnName);
  93                 column.getColumn().setWidth((Integer) objs[1]);
  94                 column.getColumn().setText((String) objs[0]);
  95         }
  96
  97         /**
  98          * Might be used by client classes to sort the table with based on selected
  99          * columns.
 100          *
 101          * @param column
 102          * @param index
 103          * @return
 104          */
 105         public SelectionAdapter getSelectionAdapter(final TableColumn column,
 106                         final int index) {
 107
 108                 // A comparator must be define
 109                 if (comparator == null)
 110                         return null;
 111
 112                 SelectionAdapter selectionAdapter = new SelectionAdapter() {
 113                         @Override
 114                         public void widgetSelected(SelectionEvent e) {
 115
 116                                 try {
 117
 118                                         comparator.setColumn(index);
 119                                         int dir = viewer.getTable().getSortDirection();
 120                                         if (viewer.getTable().getSortColumn() == column) {
 121                                                 dir = dir == SWT.UP ? SWT.DOWN : SWT.UP;
 122                                         } else {
 123
 124                                                 dir = SWT.DOWN;
 125                                         }
 126                                         viewer.getTable().setSortDirection(dir);
 127                                         viewer.getTable().setSortColumn(column);
 128                                         viewer.refresh();
 129                                 } catch (Exception exc) {
 130                                         exc.printStackTrace();
 131                                 }
 132                         }
 133                 };
 134                 return selectionAdapter;
 135         }
 136
 137         /**
 138          * provides a label provider that returns the content of a specific cell.
 139          * Specific treatment is done for some columns when the query returns a code
 140          * that must be translated to the corresponding value at display time.
 141          */
 142         public ColumnLabelProvider getLabelProvider(final String columnName) {
 143                 boolean test = false;
 144
 145                 if (test) {
 146                         return new ColumnLabelProvider() {
 147                                 public String getText(Object element) {
 148                                         return null;
 149                                 }
 150
 151                                 public Image getImage(Object element) {
 152                                         return null;
 153                                 }
 154                         };
 155                 } else
 156                         return new ColumnLabelProvider() {
 157                                 public String getText(Object element) {
 158                                         Row row = (Row) element;
 159                                         try {
 160                                                 return row.getValue(columnName).getString();
 161                                         } catch (RepositoryException e) {
 162                                                 throw new ArgeoException("Cannot display row " + row, e);
 163                                         }
 164                                 }
 165
 166                                 public Image getImage(Object element) {
 167                                         return null;
 168                                 }
 169                         };
 170         }
 171
 172         /** Implements comparator for various types of Artifact Table row */
 173         private class CurrentTableComparator extends GenericTableComparator {
 174
 175                 public CurrentTableComparator(int colIndex, int direction) {
 176                         super(colIndex, direction);
 177                 }
 178
 179                 @Override
 180                 public int compare(Viewer viewer, Object e1, Object e2) {
 181                         int rc = 0;
 182
 183                         if (e1 instanceof Row) {
 184                                 try {
 185
 186                                         Value v1 = ((Row) e1).getValue(indexToName
 187                                                         .get(propertyIndex));
 188                                         Value v2 = ((Row) e2).getValue(indexToName
 189                                                         .get(propertyIndex));
 190
 191                                         if (v1.getType() == PropertyType.STRING)
 192                                                 rc = v1.getString().compareTo(v2.getString());
 193                                         else if (v1.getType() == PropertyType.DATE)
 194                                                 rc = v1.getDate().compareTo(v2.getDate());
 195                                         else
 196                                                 throw new ArgeoException("comparator for object type "
 197                                                                 + v1.getType() + " is not yet implemented");
 198                                 } catch (Exception e) {
 199                                         throw new ArgeoException("rows cannot be compared ", e);
 200                                 }
 201                         } else
 202                                 throw new ArgeoException("Unsupported row type");
 203                         // If descending order, flip the direction
 204                         if (direction == DESCENDING) {
 205                                 rc = -rc;
 206                         }
 207                         return rc;
 208                 }
 209         }
 210 }