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1 package com.etymon.pj.util;
2
3 import java.util.*;
4 import com.etymon.pj.object.*;
5
6 public class PjObjectVector {
7
8 public PjObjectVector() {
9 _v = new Vector();
10 _free = 1;
11 }
12
13 public PjObjectVector(int initialCapacity) {
14 _v = new Vector(initialCapacity);
15 _free = 1;
16 }
17
18 public int getFirstFree() {
19 synchronized (this) {
20 return _free;
21 }
22 }
23
24 public PjObject objectAt(int index) {
25 synchronized (this) {
26 if (index >= _v.size()) {
27 return null;
28 } else {
29 return (PjObject)(_v.elementAt(index));
30 }
31 }
32 }
33
34 public void setObjectAt(PjObject obj, int index) {
35 synchronized (this) {
36 if (index >= _v.size()) {
37 _v.setSize(index + 1);
38 }
39 _v.setElementAt(obj, index);
40 if (index == _free) {
41 _free = findFirstFree(index + 1);
42 }
43 }
44 }
45
46 public int size() {
47 synchronized (this) {
48 return _v.size();
49 }
50 }
51
52
53 protected int findFirstFree(int start) {
54 synchronized (this) {
55 int x = start;
56 int size = _v.size();
57 while ( (x < size) && (_v.elementAt(x) != null) ) {
58 x++;
59 }
60 return x;
61 }
62 }
63
64 protected Vector _v;
65 protected int _free;
66
67 }
68 |
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