/*
Copyright (C) 2007 Mobixess Inc. http://www.java-objects-database.com
This file is part of the JODB (Java Objects Database) open source project.
JODB is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation.
JODB is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
public class DynamicLongArray {
final static int DEFAULT_CHUNK_SIZE = 256;
final static int DEFAULT_CHUNKS = 16;
private int _chunkSize;
private long[][] _data;
private int _length;
public DynamicLongArray() {
this(DEFAULT_CHUNK_SIZE);
}
public DynamicLongArray(int chunkSize) {
_chunkSize = chunkSize;
_data = new long[DEFAULT_CHUNKS][];
}
public boolean isEmpty() {
return (_length == 0);
}
private void ensureCapacity(int index) {
if (index >= _length) {
int i = index / _chunkSize;
if (i >= _data.length) {
// grow by 50%
int new_size = (i * 3) / 2 + 1;
long[][] newChunk = new long[new_size][];
System.arraycopy(_data, 0, newChunk, 0, _data.length);
_data = newChunk;
}
_length = index + 1;
}
}
public long get(int index) {
if (index >= _length) {
throw new IndexOutOfBoundsException("Index " + index
+ " is outside of 0.." + (_length - 1));
}
int i = index / _chunkSize;
int j = index % _chunkSize;
if (_data[i] == null) {
return 0;
} else {
return _data[i][j];
}
}
public void set(int index, long value) {
int i = index / _chunkSize;
int j = index % _chunkSize;
ensureCapacity(index);
if (_data[i] == null) {
_data[i] = new long[_chunkSize];
}
_data[i][j] = value;
}
public int size() {
return _length;
}
public String toString() {
int i;
StringBuffer sb = new StringBuffer(_length * 4);
sb.append('{');
int l = _length - 1;
for (i = 0; i < l; i++) {
sb.append(get(i));
sb.append(',');
}
sb.append(get(i));
sb.append('}');
return sb.toString();
}
}
|