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1
11 package org.eclipse.ant.internal.ui.editor;
12
13 import java.util.ArrayList  ;
14 import java.util.Iterator ;
15 import java.util.List ;
16
17 import org.eclipse.ant.internal.ui.editor.text.XMLTextHover;
18 import org.eclipse.ant.internal.ui.model.AntElementNode;
19 import org.eclipse.ant.internal.ui.model.AntModel;
20 import org.eclipse.jface.text.BadLocationException;
21 import org.eclipse.jface.text.IDocument;
22 import org.eclipse.jface.text.IRegion;
23 import org.eclipse.jface.text.Position;
24
25 public class OccurrencesFinder {
26
27 private AntModel fAntModel;
28 private AntEditor fEditor;
29 private int fOffset;
30 private IDocument fDocument;
31
32 public OccurrencesFinder(AntEditor editor, AntModel model, IDocument document, int offset) {
33 fAntModel= model;
34 fEditor= editor;
35 fDocument= document;
36 fOffset= offset;
37 }
38
39 public List perform() {
40 if (fOffset == 0 || fAntModel == null) {
41 return null;
42 }
43
44 AntElementNode container= fAntModel.getNode(fOffset, false);
45 if (container == null) {
46 return null;
47 }
48 IRegion region= XMLTextHover.getRegion(fEditor.getViewer(), fOffset);
49 if (region != null) {
50 if (!container.isRegionPotentialReference(region)) {
51 return null;
52 }
53 }
54 AntElementNode node;
55 if (container.isFromDeclaration(region)) {
56 node= container;
57 } else {
58 Object potentialNode= fEditor.findTarget(region);
59 if (!(potentialNode instanceof AntElementNode)) {
60 return null;
61 }
62 node= (AntElementNode) potentialNode;
63 }
64 String occurrencesIdentifier= node.getOccurrencesIdentifier();
65 if (occurrencesIdentifier == null) {
66 return null;
67 }
68 List nodes= new ArrayList (1);
69 nodes.add(fAntModel.getProjectNode());
70 List usages= new ArrayList ();
71 usages.add(node);
72 scanNodesForOccurrences(nodes, usages, occurrencesIdentifier);
73 String identifier;
74 try {
75 identifier= fDocument.get(region.getOffset(), region.getLength());
76 } catch (BadLocationException e) {
77 return null;
78 }
79 int length= identifier.length();
80 if (length == 0) {
81 return null;
82 }
83 List positions= new ArrayList (usages.size());
84 for (Iterator each= usages.iterator(); each.hasNext();) {
85 AntElementNode currentNode= (AntElementNode)each.next();
86 List offsets= currentNode.computeIdentifierOffsets(identifier);
87 if (offsets != null) {
88 for (int i = 0; i < offsets.size(); i++) {
89 positions.add(new Position(((Integer )offsets.get(i)).intValue(), length));
90 }
91 }
92 }
93
94 return positions;
95 }
96
97 private void scanNodesForOccurrences(List nodes, List usages, String identifier) {
98 Iterator iter= nodes.iterator();
99 while (iter.hasNext()) {
100 AntElementNode node = (AntElementNode) iter.next();
101 if (!usages.contains(node) && node.containsOccurrence(identifier)) {
102 usages.add(node);
103 }
104 if (node.hasChildren()) {
105 scanNodesForOccurrences(node.getChildNodes(), usages, identifier);
106 }
107 }
108 }
109 } |
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