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1
47
48 package org.ozoneDB.collections;
49
50 import java.util.ConcurrentModificationException  ;
51 import java.util.NoSuchElementException ;
52 import org.ozoneDB.OzoneObject;
53
54
58 public class _BaseList_ListIteratorImpl extends OzoneObject implements OzoneListIterator {
59
60 private BaseList owner;
61 private int knownMod;
62 private int position;
63 private int lastReturned = -1;
64 private int size;
65
66
67 public _BaseList_ListIteratorImpl(BaseList owner, int index) {
68 this.owner = owner;
69 knownMod = owner._org_ozoneDB_getModCount();
70 position = index;
71 size = owner.size();
72 }
73
74 private void checkMod() {
76 if (knownMod != owner._org_ozoneDB_getModCount()) {
77 throw new ConcurrentModificationException ();
78 }
79 }
80
81 public boolean hasNext() {
82 checkMod();
83 return position < size;
84 }
85
86 public boolean hasPrevious() {
87 checkMod();
88 return position > 0;
89 }
90
91 public Object next() {
92 checkMod();
93 if (position == size) {
94 throw new NoSuchElementException ();
95 }
96 lastReturned = position;
97 return owner.get(position++);
98 }
99
100 public Object previous() {
101 checkMod();
102 if (position == 0) {
103 throw new NoSuchElementException ();
104 }
105 lastReturned = --position;
106 return owner.get(lastReturned);
107 }
108
109 public int nextIndex() {
110 checkMod();
111 return position;
112 }
113
114 public int previousIndex() {
115 checkMod();
116 return position - 1;
117 }
118
119 public void remove() {
120 checkMod();
121 if (lastReturned < 0)
122 throw new IllegalStateException ();
123 owner.remove(lastReturned);
124 size--;
125 position = lastReturned;
126 lastReturned = -1;
127 knownMod = owner._org_ozoneDB_getModCount();
128 }
129
130 public void set(Object o) {
131 checkMod();
132 if (lastReturned < 0) {
133 throw new IllegalStateException ();
134 }
135 owner.set(lastReturned, o);
136 }
137
138 public void add(Object o) {
139 checkMod();
140 owner.add(position++, o);
141 size++;
142 lastReturned = -1;
143 knownMod = owner._org_ozoneDB_getModCount();
144 }
145
146 } |
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