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1
21 package com.db4o.inside.btree;
22
23 import com.db4o.*;
24 import com.db4o.foundation.*;
25 import com.db4o.inside.ix.*;
26
27
28
31 public class FieldIndexKeyHandler implements Indexable4{
32
33 private final Indexable4 _valueHandler;
34
35 private final YInt _parentIdHandler;
36
37 public FieldIndexKeyHandler(YapStream stream, Indexable4 delegate_) {
38 _parentIdHandler = new IDHandler(stream);
39 _valueHandler = delegate_;
40 }
41
42 public Object  comparableObject(Transaction trans, Object indexEntry) {
43 throw new NotImplementedException();
44 }
45
46 public int linkLength() {
47 return _valueHandler.linkLength() + YapConst.INT_LENGTH;
48 }
49
50 public Object readIndexEntry(YapReader a_reader) {
51 int parentID = readParentID(a_reader);
53 Object objPart = _valueHandler.readIndexEntry(a_reader);
54 if (parentID < 0){
55 objPart = null;
56 parentID = - parentID;
57 }
58 return new FieldIndexKey(parentID, objPart);
59 }
60
61 private int readParentID(YapReader a_reader) {
62 return ((Integer )_parentIdHandler.readIndexEntry(a_reader)).intValue();
63 }
64
65 public void writeIndexEntry(YapReader writer, Object obj) {
66 FieldIndexKey composite = (FieldIndexKey)obj;
67 int parentID = composite.parentID();
68 Object value = composite.value();
69 if (value == null){
70 parentID = - parentID;
71 }
72 _parentIdHandler.write(parentID, writer);
73 _valueHandler.writeIndexEntry(writer, composite.value());
74 }
75
76 public YapComparable prepareComparison(Object obj) {
77 FieldIndexKey composite = (FieldIndexKey)obj;
78 _valueHandler.prepareComparison(composite.value());
79 _parentIdHandler.prepareComparison(composite.parentID());
80 return this;
81 }
82
83 public int compareTo(Object obj) {
84 if (null == obj) {
85 throw new ArgumentNullException();
86 }
87 FieldIndexKey composite = (FieldIndexKey)obj;
88 int delegateResult = _valueHandler.compareTo(composite.value());
89 if(delegateResult != 0 ){
90 return delegateResult;
91 }
92 return _parentIdHandler.compareTo(composite.parentID());
93 }
94
95 public boolean isEqual(Object obj) {
96 throw new NotImplementedException();
97 }
98
99 public boolean isGreater(Object obj) {
100 throw new NotImplementedException();
101 }
102
103 public boolean isSmaller(Object obj) {
104 throw new NotImplementedException();
105 }
106
107 public Object current() {
108 return new FieldIndexKey(_parentIdHandler.currentInt(), _valueHandler.current());
109 }
110
111 public void defragIndexEntry(ReaderPair readers) {
112 _parentIdHandler.defragIndexEntry(readers);
113 _valueHandler.defragIndexEntry(readers);
114 }
115 }
116
117 |
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