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/*
* Copyright (C) 2002-2012 XimpleWare, [email protected]
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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.
*/
package com.ximpleware;
import java.lang.IndexOutOfBoundsException;
import java.lang.NullPointerException;
import java.lang.IllegalArgumentException;
import java.util.ArrayList;
/**
* A fast, unsynchronized, chunk-based int buffer
*
*/
public class FastIntBuffer implements IIntBuffer {
/* bufferArrayList is a resizable array list of int buffers
*
*/
public final static int ASCENDING = 0;
public final static int DESCENDING = 1;
private arrayList bufferArrayList;
/**
* Total capacity of the IntBuffer
*/
private int capacity;
/**
* Page size of the incremental growth of the Int Buffer
*/
private int pageSize;
/**
* Total number of integers in the IntBuffer
*/
protected int size;
private int exp;
private int r;
/**
* FastIntBuffer constructor comment.
*/
public FastIntBuffer() {
size = 0;
capacity = 0;
pageSize = 1024;
exp = 10;
r = 1023;
bufferArrayList = new arrayList();
}
/**
* Constructor with adjustable buffer page size of the value bfz
* The actually page size is 1<>exp),//+(((size&r)==0)? 0:1),
bufferArrayList.size - 1);
lastBuffer = (int[]) bufferArrayList.get(lastBufferIndex);
}
if ((this.size + int_array.length) < this.capacity) {
//get the last buffer from the bufferListArray
//obtain the starting offset in that buffer to which the data is to be copied
//update length
//System.arraycopy(input, 0, lastBuffer, size % pageSize, input.length);
if (this.size + int_array.length< ((lastBufferIndex+1)<> exp;
int z;
for (z=1;z<=k;z++){
System.arraycopy(int_array,offset,
(int[]) bufferArrayList.get(lastBufferIndex+z), 0, pageSize);
offset += pageSize;
}
// copy the last part
System.arraycopy(int_array, offset,
(int[]) bufferArrayList.get(lastBufferIndex+z), 0, l & r);
}
size += int_array.length;
return;
} else // new buffers needed
{
// compute the number of additional buffers needed
// int n =
// ((int) ((int_array.length + size) / pageSize))
// + (((int_array.length + size) % pageSize) > 0 ? 1 : 0)
// - (int) (capacity / pageSize);
int n =
((int_array.length + size) >> exp)
+ (((int_array.length + size) &r) > 0 ? 1 : 0)
- (capacity >> exp);
// create these buffers
// add to bufferArrayList
//System.arraycopy(int_array, 0, lastBuffer, size % pageSize, capacity - size);
System.arraycopy(int_array, 0, lastBuffer, size& r, capacity - size);
for (int i = 0; i < n; i++) {
int[] newBuffer = new int[pageSize];
if (i < n - 1) {
// full copy
System.arraycopy(
int_array,
pageSize * i + capacity - size,
newBuffer,
0,
pageSize);
} else {
// last page
System.arraycopy(
int_array,
pageSize * i + capacity - size,
newBuffer,
0,
int_array.length + this.size - capacity - pageSize*i);
}
bufferArrayList.add(newBuffer);
}
// update length
size += int_array.length;
// update capacity
capacity += n * pageSize;
// update
}
}
/**
* Append a single int to the end of this buffer Instance
* @param i int
*/
public final void append(int i) {
//int[] lastBuffer;
//int lastBufferIndex;
/*if (bufferArrayList.size == 0) {
lastBuffer = new int[pageSize];
bufferArrayList.add(lastBuffer);
capacity = pageSize;
} else {
lastBufferIndex = Math.min((size>>exp),//+(((size&r)==0)? 0:1),
bufferArrayList.size - 1);
lastBuffer = (int[]) bufferArrayList.oa[lastBufferIndex];
//lastBuffer = (int[]) bufferArrayList.get(bufferArrayList.size() - 1);
}*/
if (this.size < this.capacity) {
//get the last buffer from the bufferListArray
//obtain the starting offset in that buffer to which the data is to be copied
//update length
//System.arraycopy(long_array, 0, lastBuffer, size % pageSize, long_array.length);
((int[]) bufferArrayList.oa[size >> exp])[size & r] = i;
//((int[])bufferArrayList.oa[bufferArrayList.size-1])[size & r] = i;
// lastBuffer[size % pageSize] = i;
size += 1;
} else // new buffers needed
{
int[] newBuffer = new int[pageSize];
size++;
capacity += pageSize;
bufferArrayList.add(newBuffer);
newBuffer[0] = i;
}
}
/**
* Returns the total allocated capacity of this buffer instance.
* @return int
*/
public final int getCapacity() {
return capacity;
}
/**
* Returns a single int array representing every int in this buffer instance
* @return int[] (null if there isn't anything left in the buffer
* @param startingOffset int
* @param len int
* @return int[]
*/
public int[] getIntArray(int startingOffset, int len) {
if (size <= 0 || startingOffset < 0) {
throw (new IllegalArgumentException());
}
if ((startingOffset + len) > size) {
throw (new IndexOutOfBoundsException());
}
int[] result = new int[len]; // allocate result array
// int first_index = (int) (startingOffset / pageSize);
// int last_index = (int) ((startingOffset + len) / pageSize);
// if ((startingOffset + len) % pageSize == 0) {
// last_index--;
// }
int first_index = startingOffset >> exp;
int last_index = (startingOffset + len)>> exp;
if (((startingOffset + len) & r) == 0) {
last_index--;
}
if (first_index == last_index) {
// to see if there is a need to go across buffer boundry
System.arraycopy(
(int[]) (bufferArrayList.get(first_index)),
// startingOffset % pageSize,
startingOffset & r,
result,
0,
len);
} else {
int int_array_offset = 0;
for (int i = first_index; i <= last_index; i++) {
int[] currentChunk = (int[]) bufferArrayList.get(i);
if (i == first_index) // first section
{
System.arraycopy(
currentChunk,
// startingOffset % pageSize,
startingOffset & r,
result,
0,
// pageSize - (startingOffset % pageSize));
pageSize - (startingOffset & r));
// int_array_offset += pageSize - (startingOffset) % pageSize;
int_array_offset += pageSize - (startingOffset & r);
} else if (i == last_index) // last sections
{
System.arraycopy(
currentChunk,
0,
result,
int_array_offset,
len - int_array_offset);
} else {
System.arraycopy(currentChunk, 0, result, int_array_offset, pageSize);
int_array_offset += pageSize;
}
}
}
return result;
}
/**
* Returns the page size of this buffer instance.
* Creation date: (7/17/03 6:38:02 PM)
* @return int
*/
public final int getPageSize() {
return pageSize;
}
/**
* Get the int at the location specified by index.
* @return int
* @param index int
*/
public final int intAt(int index) {
/*if (index > size-1) {
throw new IndexOutOfBoundsException();
}*/
// int pageNum = (int) index / pageSize;
int pageNum = index>>exp;
//System.out.println("page Number is "+pageNum);
// int offset = index % pageSize;
int offset = index & r;
return ((int[]) bufferArrayList.get(pageNum))[offset];
}
/**
* Assigns a new int value to location index of the buffer instance.
* @param index int
* @param newValue int
*/
public final void modifyEntry(int index, int newValue) {
/*if (index > size - 1) {
throw new IndexOutOfBoundsException(" index out of range");
}*/
// ((int[]) bufferArrayList.get((int) (index / pageSize)))[index % pageSize] =
((int[]) bufferArrayList.oa[index >> exp])[index & r] =
newValue;
}
/**
* Returns the total number of int values in the buffer instance
* @return int
*/
public final int size() {
return size;
}
/**
* Returns the int array corresponding to all int values in this buffer instance
* @return int[] (null if the buffer is empty)
*/
public int[] toIntArray() {
if (size > 0) {
int s = size;
int[] resultArray = new int[size];
//copy all the content int into the resultArray
int array_offset = 0;
for (int i = 0; s>0; i++) {
System.arraycopy(
(int[]) bufferArrayList.get(i),
0,
resultArray,
array_offset,
(s=0){
size = newSz;
return true;
}
else
return false;
}
/**
* Sort the integers in the buffer
* @param order (as of version 2.9)
* it can be either ASCENDING or DESCENDING
*/
public void sort(int order) {
switch (order) {
case ASCENDING:
if (size > 0)
quickSort_ascending(0, size - 1);
break;
case DESCENDING:
if (size > 0)
quickSort_descending(0, size - 1);
break;
default:
throw new IllegalArgumentException("Sort type undefined");
}
}
void quickSort_ascending (int lo, int hi)
{
// lo is the lower index, hi is the upper index
// of the region of array a that is to be sorted
//System.out.println("lo ==>"+lo);
//System.out.println("hi ==>"+hi);
int i=lo, j=hi;
int h;
//Object o;
int x=this.intAt((lo+hi)/2);
// partition
do
{
while (intAt(i)x) j--;
if (i<=j)
{
h=this.intAt(i);
modifyEntry(i,this.intAt(j));
modifyEntry(j,h);
i++;
j--;
}
} while (i<=j);
// recursion
if (lo"+lo);
//System.out.println("hi ==>"+hi);
int i=lo, j=hi;
int h;
//Object o;
int x=this.intAt((lo+hi)/2);
// partition
do
{
while (intAt(i)>x) i++;
while (intAt(j)
