/*
* eXist Open Source Native XML Database
* Copyright (C) 2009 The eXist Project
* http://exist-db.org
*
* This program 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
* 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
* $Id$
*/
package org.exist.util;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import org.exist.dom.NodeProxy;
import org.exist.numbering.NodeId;
/**
This class implements Floyd's version
of the heapsort algorithm.
http://users.encs.concordia.ca/~chvatal/notes/hsort.html
http://en.wikipedia.org/wiki/Heapsort#Variations
@author José María Fernández (jmfg@users.sourceforge.net)
*/
public final class HSort {
public static <C extends Comparable<? super C>> void sort(C[] a, int lo, int hi)
{
if (lo >= hi)
return;
// Next lines are a generalization from makeheap
int drop=1;
// originally, first was n/2-1
int first=(hi+lo-1)/2;
for(int k=first; k>=lo; k--) {
if(k==(first-1)/2) {
drop++;
first=k;
}
siftdown(a, hi+1, k, a[k], drop);
}
// Next two lines does the same as floor_of_lg
// And they have been inferred from Java manual
int last=Integer.highestOneBit(hi-lo);
drop=31-Integer.numberOfLeadingZeros(last);
// Scaling last
int lastlo=last+lo;
for(int k=hi; k>lo; k--) {
C temp=a[k];
a[k]=a[lo];
siftdown(a, k, lo, temp, drop);
if (k==lastlo) {
drop--;
last/=2;
lastlo=last+lo;
}
}
}
public static <C extends Comparable<? super C>> void sort(C[] a, int lo, int hi, int[] b)
{
if (lo >= hi)
return;
// Next lines are a generalization from makeheap
int drop=1;
// originally, first was n/2-1
int first=(hi+lo-1)/2;
for(int k=first; k>=lo; k--) {
if(k==(first-1)/2) {
drop++;
first=k;
}
siftdown(a, b, hi+1, k, a[k],(b!=null)?b[k]:0, drop);
}
// Next two lines does the same as floor_of_lg
// And they have been inferred from Java manual
int last=Integer.highestOneBit(hi-lo);
drop=31-Integer.numberOfLeadingZeros(last);
// Scaling last
int lastlo=last+lo;
for(int k=hi; k>lo; k--) {
C temp=a[k];
a[k]=a[lo];
int tempB;
if(b!=null) {
tempB=b[k];
b[k]=b[lo];
} else {
tempB=0;
}
siftdown(a, b, k, lo, temp, tempB, drop);
if (k==lastlo) {
drop--;
last/=2;
lastlo=last+lo;
}
}
}
public static <C> void sort(C[] a, Comparator<C> c, int lo, int hi)
{
if (lo >= hi)
return;
// Next lines are a generalization from makeheap
int drop=1;
// originally, first was n/2-1
int first=(hi+lo-1)/2;
for(int k=first; k>=lo; k--) {
if(k==(first-1)/2) {
drop++;
first=k;
}
siftdown(a, c, hi+1, k, a[k], drop);
}
// Next two lines does the same as floor_of_lg
// And they have been inferred from Java manual
int last=Integer.highestOneBit(hi-lo);
drop=31-Integer.numberOfLeadingZeros(last);
// Scaling last
int lastlo=last+lo;
for(int k=hi; k>lo; k--) {
C temp=a[k];
a[k]=a[lo];
siftdown(a, c, k, lo, temp, drop);
if (k==lastlo) {
drop--;
last/=2;
lastlo=last+lo;
}
}
}
public static <C extends Comparable<? super C>> void sort(List<C> a, int lo, int hi)
{
if (lo >= hi)
return;
// Next lines are a generalization from makeheap
int drop=1;
// originally, first was n/2-1
int first=(hi+lo-1)/2;
for(int k=first; k>=lo; k--) {
if(k==(first-1)/2) {
drop++;
first=k;
}
siftdown(a, hi+1, k, a.get(k), drop);
}
// Next two lines does the same as floor_of_lg
// And they have been inferred from Java manual
int last=Integer.highestOneBit(hi-lo);
drop=31-Integer.numberOfLeadingZeros(last);
// Scaling last
int lastlo=last+lo;
for(int k=hi; k>lo; k--) {
C temp=a.get(k);
a.set(k,a.get(lo));
siftdown(a, k, lo, temp, drop);
if (k==lastlo) {
drop--;
last/=2;
lastlo=last+lo;
}
}
}
public static void sort(long[] a, int lo, int hi, Object[] b)
{
if (lo >= hi)
return;
// Next lines are a generalization from makeheap
int drop=1;
// originally, first was n/2-1
int first=(hi+lo-1)/2;
for(int k=first; k>=lo; k--) {
if(k==(first-1)/2) {
drop++;
first=k;
}
siftdown(a, b, hi+1, k, a[k],(b!=null)?b[k]:null, drop);
}
// Next two lines does the same as floor_of_lg
// And they have been inferred from Java manual
int last=Integer.highestOneBit(hi-lo);
drop=31-Integer.numberOfLeadingZeros(last);
// Scaling last
int lastlo=last+lo;
for(int k=hi; k>lo; k--) {
long temp=a[k];
a[k]=a[lo];
Object tempB;
if(b!=null) {
tempB=b[k];
b[k]=b[lo];
} else {
tempB=null;
}
siftdown(a, b, k, lo, temp, tempB, drop);
if (k==lastlo) {
drop--;
last/=2;
lastlo=last+lo;
}
}
}
public static void sortByNodeId(NodeProxy[] a, int lo, int hi)
{
if (lo >= hi)
return;
// Next lines are a generalization from makeheap
int drop=1;
// originally, first was n/2-1
int first=(hi+lo-1)/2;
for(int k=first; k>=lo; k--) {
if(k==(first-1)/2) {
drop++;
first=k;
}
siftdownByNodeId(a, hi+1, k, a[k], drop);
}
// Next two lines does the same as floor_of_lg
// And they have been inferred from Java manual
int last=Integer.highestOneBit(hi-lo);
drop=31-Integer.numberOfLeadingZeros(last);
// Scaling last
int lastlo=last+lo;
for(int k=hi; k>lo; k--) {
NodeProxy temp=a[k];
a[k]=a[lo];
siftdownByNodeId(a, k, lo, temp, drop);
if (k==lastlo) {
drop--;
last/=2;
lastlo=last+lo;
}
}
}
private static <C extends Comparable<? super C>> void siftdown(C[] a, int n, int vacant, C missing, int drop)
{
int memo=vacant;
int child, parent;
int count, next_peek;
count=0;
next_peek=(drop+1)/2;
child=2*(vacant+1);
while(child<n) {
if(a[child].compareTo(a[child-1])<0)
child--;
a[vacant]=a[child];
vacant=child;
child=2*(vacant+1);
count++;
if (count==next_peek) {
if(a[(vacant-1)/2].compareTo(missing)<=0)
break;
else
next_peek=(count+drop+1)/2;
}
}
if(child==n) {
a[vacant]=a[n-1];
vacant=n-1;
}
parent=(vacant-1)/2;
while(vacant>memo) {
if(a[parent].compareTo(missing)<0) {
a[vacant]=a[parent];
vacant=parent;
parent=(vacant-1)/2;
} else
break;
}
a[vacant]=missing;
}
private static <C extends Comparable<? super C>> void siftdown(C[] a, int[] b, int n, int vacant, C missing, int missingB, int drop)
{
int memo=vacant;
int child, parent;
int count, next_peek;
count=0;
next_peek=(drop+1)/2;
child=2*(vacant+1);
while(child<n) {
if(a[child].compareTo(a[child-1])<0)
child--;
a[vacant]=a[child];
if(b!=null)
b[vacant]=b[child];
vacant=child;
child=2*(vacant+1);
count++;
if (count==next_peek) {
if(a[(vacant-1)/2].compareTo(missing)<=0)
break;
else
next_peek=(count+drop+1)/2;
}
}
if(child==n) {
a[vacant]=a[n-1];
if(b!=null)
b[vacant]=b[n-1];
vacant=n-1;
}
parent=(vacant-1)/2;
while(vacant>memo) {
if(a[parent].compareTo(missing)<0) {
a[vacant]=a[parent];
if(b!=null)
b[vacant]=b[parent];
vacant=parent;
parent=(vacant-1)/2;
} else
break;
}
a[vacant]=missing;
if(b!=null)
b[vacant]=missingB;
}
private static <C> void siftdown(C[] a, Comparator<C> c, int n, int vacant, C missing, int drop)
{
int memo=vacant;
int child, parent;
int count, next_peek;
count=0;
next_peek=(drop+1)/2;
child=2*(vacant+1);
while(child<n) {
if(c.compare(a[child],a[child-1])<0)
child--;
a[vacant]=a[child];
vacant=child;
child=2*(vacant+1);
count++;
if (count==next_peek) {
if(c.compare(a[(vacant-1)/2],missing)<=0)
break;
else
next_peek=(count+drop+1)/2;
}
}
if(child==n) {
a[vacant]=a[n-1];
vacant=n-1;
}
parent=(vacant-1)/2;
while(vacant>memo) {
if(c.compare(a[parent],missing)<0) {
a[vacant]=a[parent];
vacant=parent;
parent=(vacant-1)/2;
} else
break;
}
a[vacant]=missing;
}
private static <C extends Comparable<? super C>> void siftdown(List<C> a, int n, int vacant, C missing, int drop)
{
int memo=vacant;
int child, parent;
int count, next_peek;
count=0;
next_peek=(drop+1)/2;
child=2*(vacant+1);
while(child<n) {
if(a.get(child).compareTo(a.get(child-1))<0)
child--;
a.set(vacant, a.get(child));
vacant=child;
child=2*(vacant+1);
count++;
if (count==next_peek) {
if(a.get((vacant-1)/2).compareTo(missing)<=0)
break;
else
next_peek=(count+drop+1)/2;
}
}
if(child==n) {
a.set(vacant,a.get(n-1));
vacant=n-1;
}
parent=(vacant-1)/2;
while(vacant>memo) {
if(a.get(parent).compareTo(missing)<0) {
a.set(vacant,a.get(parent));
vacant=parent;
parent=(vacant-1)/2;
} else
break;
}
a.set(vacant,missing);
}
private static void siftdown(long[] a, Object[] b, int n, int vacant, long missing, Object missingB, int drop)
{
int memo=vacant;
int child, parent;
int count, next_peek;
count=0;
next_peek=(drop+1)/2;
child=2*(vacant+1);
while(child<n) {
if(a[child]<a[child-1])
child--;
a[vacant]=a[child];
if(b!=null)
b[vacant]=b[child];
vacant=child;
child=2*(vacant+1);
count++;
if (count==next_peek) {
if(a[(vacant-1)/2]<=missing)
break;
else
next_peek=(count+drop+1)/2;
}
}
if(child==n) {
a[vacant]=a[n-1];
if(b!=null)
b[vacant]=b[n-1];
vacant=n-1;
}
parent=(vacant-1)/2;
while(vacant>memo) {
if(a[parent]<missing) {
a[vacant]=a[parent];
if(b!=null)
b[vacant]=b[parent];
vacant=parent;
parent=(vacant-1)/2;
} else
break;
}
a[vacant]=missing;
if(b!=null)
b[vacant]=missingB;
}
private static void siftdownByNodeId(NodeProxy[] a, int n, int vacant, NodeProxy missing, int drop)
{
int memo=vacant;
int count=0;
int next_peek=(drop+1)/2;
int child=2*(vacant+1);
NodeId missingNodeId=missing.getNodeId();
while(child<n) {
if(a[child].getNodeId().compareTo(a[child-1].getNodeId())<0)
child--;
a[vacant]=a[child];
vacant=child;
child=2*(vacant+1);
count++;
if (count==next_peek) {
if(a[(vacant-1)/2].getNodeId().compareTo(missingNodeId)<=0)
break;
else
next_peek=(count+drop+1)/2;
}
}
if(child==n) {
a[vacant]=a[n-1];
vacant=n-1;
}
int parent=(vacant-1)/2;
while(vacant>memo) {
if(a[parent].getNodeId().compareTo(missingNodeId)<0) {
a[vacant]=a[parent];
vacant=parent;
parent=(vacant-1)/2;
} else
break;
}
a[vacant]=missing;
}
public static void main(String[] args) throws Exception {
List<String> l = new ArrayList<String>();
if(args.length==0) {
String[] a=new String[] {
"Rudi",
"Herbert",
"Anton",
"Berta",
"Olga",
"Willi",
"Heinz"
};
for (int i = 0; i < a.length; i++)
l.add(a[i]);
} else {
System.err.println("Ordering file "+args[0]+"\n");
try {
java.io.BufferedReader is=new java.io.BufferedReader(new java.io.FileReader(args[0]));
String rr;
while((rr=is.readLine())!=null) {
l.add(rr);
}
is.close();
} catch(Exception e) {
}
}
long a;
long b;
a=System.currentTimeMillis();
sort(l, 0, l.size() - 1);
b=System.currentTimeMillis();
System.err.println("Ellapsed time: "+(b-a)+" size: "+l.size());
for (int i = 0; i < l.size(); i++)
System.out.println(l.get(i));
}
}