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   1 package com.quantum.view.subset;
   2
   3 import java.util.Vector;
   4
   5 import com.quantum.Messages;
   6 import com.quantum.sql.metadata.MetaDataXMLInterface;
   7 import com.quantum.view.bookmark.ColumnNode;
   8 import com.quantum.view.bookmark.TreeNode;
   9
  10 import org.eclipse.jface.viewers.ITreeContentProvider;
  11 import org.eclipse.jface.viewers.Viewer;
  12 import org.w3c.dom.Element;
  13 import org.w3c.dom.NodeList;
  14
  15 public class SubsetContentProvider implements ITreeContentProvider {
  16         private Vector subsets = new Vector();
  17         private static SubsetContentProvider instance = null;
  18         private boolean hasChanged = false;
  19
  20    /**
  21     * Singleton accessor
  22     */
  23         public static synchronized SubsetContentProvider getInstance() {
  24                 if (instance == null) {
  25                         instance = new SubsetContentProvider();
  26                 }
  27                 return instance;
  28         }
  29
  30         private SubsetContentProvider() {
  31         }
  32
  33         public void exportXML(Element root) {
  34                 System.out.println("Subsets: Saving to Element"); //$NON-NLS-1$
  35                 Element subsetRoot = MetaDataXMLInterface.createElementText(root,Messages.getString("ExportXMLAction.Subsets"), ""); //$NON-NLS-1$ //$NON-NLS-2$
  36                 for (int i = 0; i < subsets.size(); i++) {
  37                         SubsetNode current = (SubsetNode) subsets.get(i);
  38                         current.exportXML(subsetRoot);
  39                 }
  40         }
  41
  42         /**
  43          * Imports the data from an XML file to the tree. Does not set the tree to
  44          * changed because it's usually invoked from the initial import routine.
  45          * @param root
  46          */
  47         public void importXML(Element root){
  48                 System.out.println("Bookmarks: Loading from Element"); //$NON-NLS-1$
  49                 Vector newSubsets = new Vector();
  50                 NodeList nodes = root.getElementsByTagName(Messages.getString("ExportXMLAction.Subset")); //$NON-NLS-1$
  51                 for (int i = 0; i < nodes.getLength(); i++) {
  52                         SubsetNode subset = new SubsetNode();
  53                         Element node = (Element) nodes.item(i);
  54                         subset.importXML(node,true);
  55                         newSubsets.add(subset);
  56                 }
  57                 subsets = newSubsets;
  58         }
  59
  60
  61         public Object[] getChildren(Object parentElement) {
  62                 if (parentElement.equals(SubsetRoot.ROOT)) {
  63                         return subsets.toArray();
  64                 } else if (parentElement instanceof TreeNode) {
  65                         TreeNode node = (TreeNode) parentElement;
  66                         return node.getChildren();
  67                 }
  68                 return SubsetRoot.EMPTY_ARRAY;
  69         }
  70
  71         public Object[] getElements(Object inputElement) {
  72                 return getChildren(inputElement);
  73         }
  74
  75         public Object getParent(Object element) {
  76                 if (element.equals(SubsetRoot.ROOT)) {
  77                         return null;
  78                 } else if (element instanceof TreeNode) {
  79                         TreeNode node = (TreeNode) element;
  80                         return node.getParent();
  81                 }
  82                 return null;
  83         }
  84
  85         public boolean hasChildren(Object element) {
  86                 if (element.equals(SubsetRoot.ROOT)) {
  87                         return true;
  88                 } else if (element instanceof TreeNode) {
  89                         TreeNode node = (TreeNode) element;
  90                         return node.hasChildren();
  91                 }
  92                 return false;
  93         }
  94
  95     public void setChildren(SubsetNode b, Vector tables) {
  96         b.setChildren(tables);
  97     }
  98
  99         public void addSubset(SubsetNode b) {
 100                 hasChanged = true;
 101                 if (!subsets.contains(b)) {
 102                         subsets.addElement(b);
 103                 }
 104         }
 105         public void removeSubset(SubsetNode b) {
 106                 hasChanged = true;
 107                 if (subsets.contains(b)) {
 108                         subsets.removeElement(b);
 109                 }
 110         }
 111
 112         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 113         }
 114
 115         public void dispose() {
 116         }
 117
 118         public boolean hasChanged() {
 119                 return hasChanged;
 120         }
 121
 122         public int getSize() {
 123                 return subsets.size();
 124         }
 125
 126         /**
 127          * @param b
 128          */
 129         public void setHasChanged(boolean b) {
 130                 hasChanged = b;
 131         }
 132
 133         /**
 134          * @param column
 135          */
 136         public void deleteColumn(ColumnNode column) {
 137         // TODO: reinstate this
 138 //              TreeNode node = (TreeNode) column.getParent();
 139 //              if (!(node instanceof HasMetaData)) return;
 140 //              ObjectMetaData metadata = ((HasMetaData)node).getMetaData();
 141 //              if (metadata == null) return;
 142 //              metadata.dropColumn(column.getName());
 143 //              setHasChanged(true);
 144 //
 145         }
 146
 147         /**
 148          * @param object
 149          */
 150         public void deleteObject(ObjectNode object) {
 151                 SubsetNode node = (SubsetNode) object.getParent();
 152                 if (!(node instanceof SubsetNode)) return;
 153                 node.remove(object);
 154                 setHasChanged(true);
 155
 156         }
 157
 158 }