*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ---------------
* Expressions.java
* ---------------
* Author: Volker Berlin
*
*/
package smallsql.database;
final class Expressions {
private int size;
private Expression[] data;
Expressions(){
data = new Expression[16];
}
Expressions(int initSize){
data = new Expression[initSize];
}
final int size(){
return size;
}
final void setSize(int newSize){
for(int i=newSize; i<size; i++) data[i] = null;
size = newSize;
if(size>data.length) resize(newSize);
}
final Expression get(int idx){
if (idx >= size)
throw new IndexOutOfBoundsException("Index: "+idx+", Size: "+size);
return data[idx];
}
final void add(Expression expr){
if(size >= data.length ){
resize(size << 1);
}
data[size++] = expr;
}
final void add(int idx, Expression expr){
if(size >= data.length ){
resize(size << 1);
}
System.arraycopy( data, idx, data, idx+1, (size++)-idx);
data[idx] = expr;
}
final void addAll(Expressions cols){
int count = cols.size();
if(size + count >= data.length ){
resize(size + count);
}
System.arraycopy( cols.data, 0, data, size, count);
size += count;
}
final void clear(){
size = 0;
}
final void remove(int idx){
System.arraycopy( data, idx+1, data, idx, (--size)-idx);
}
final void set(int idx, Expression expr){
data[idx] = expr;
}
final int indexOf(Expression expr) {
if (expr == null) {
for (int i = 0; i < size; i++)
if (data[i]==null)
return i;
} else {
for (int i = 0; i < size; i++)
if (expr.equals(data[i]))
return i;
}
return -1;
}
final void toArray(Expression[] array){
System.arraycopy( data, 0, array, 0, size);
}
final Expression[] toArray(){
Expression[] array = new Expression[size];
System.arraycopy( data, 0, array, 0, size);
return array;
}
private final void resize(int newSize){
Expression[] dataNew = new Expression[newSize];
System.arraycopy(data, 0, dataNew, 0, size);
data = dataNew;
}
}