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/*
* @(#)GeneratorHeap.java 1.6 06/10/30
*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/**
* @date 1/13/98
* @author Jacek R. Ambroziak
* @group Sun Microsystems Laboratories
*/
package com.sun.java.help.search;
class GeneratorHeap
{
private static final int InitSize = 128;
private int _heapSize = 0;
private ConceptGroupGenerator[] _heap;
private int _size = InitSize;
private int _free = 0;
public GeneratorHeap() {
_heap = new ConceptGroupGenerator[InitSize];
}
public void reset() {
_free = 0;
}
public void addGenerator(ConceptGroupGenerator gen)
{
if (_free == _size)
{
ConceptGroupGenerator[] newArray =
new ConceptGroupGenerator[_size *= 2];
System.arraycopy(_heap, 0, newArray, 0, _free);
_heap = newArray;
}
_heap[_free++] = gen;
}
private void buildHeap()
{
for (int i = _heapSize/2; i >= 0; i--)
heapify(i);
}
private void heapify(int i)
{
int r = (i + 1) << 1, l = r - 1;
int smallest = l<_heapSize&&_heap[l].position()<_heap[i].position()?l:i;
if (r < _heapSize && _heap[r].position() < _heap[smallest].position())
smallest = r;
if (smallest != i)
{
ConceptGroupGenerator temp = _heap[smallest];
_heap[smallest] = _heap[i];
_heap[i] = temp;
heapify(smallest);
}
}
public boolean start(RoleFiller[] array) throws Exception
{
if ((_heapSize = _free) > 0)
{
for (int i = 0; i < _free; i++)
_heap[i].next();
buildHeap();
_heap[0].generateFillers(array);
return true;
}
else
return false;
}
public boolean next(RoleFiller[] array) throws Exception
{
if (_heapSize > 0)
{
if (!_heap[0].next()) // no more
if (_heapSize > 1)
_heap[0] = _heap[--_heapSize];
else
{
_heapSize = 0;
return false;
}
heapify(0);
_heap[0].generateFillers(array);
return true;
}
else
return false;
}
}
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