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1
21 package com.db4o.inside.fieldindex;
22
23 import com.db4o.*;
24 import com.db4o.foundation.*;
25
26 public class IndexedPath extends IndexedNodeBase {
27
28 public static IndexedNode newParentPath(IndexedNode next, QCon constraint) {
29 if (!canFollowParent(constraint)) {
30 return null;
31 }
32 return new IndexedPath((QConObject) constraint.parent(), next);
33 }
34
35 private static boolean canFollowParent(QCon con) {
36 final QCon parent = con.parent();
37 final YapField parentField = getYapField(parent);
38 if (null == parentField) return false;
39 final YapField conField = getYapField(con);
40 if (null == conField) return false;
41 return parentField.hasIndex()
42 && parentField.getParentYapClass().isAssignableFrom(conField.getParentYapClass());
43 }
44
45 private static YapField getYapField(QCon con) {
46 QField field = con.getField();
47 if (null == field) return null;
48 return field.getYapField();
49 }
50
51 private IndexedNode _next;
52
53 public IndexedPath(QConObject parent, IndexedNode next) {
54 super(parent);
55 _next = next;
56 }
57
58 public Iterator4 iterator() {
59 return new IndexedPathIterator(this, _next.iterator());
60 }
61
62 public int resultSize() {
63 throw new NotSupportedException();
64 }
65 }
66 |
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