src/dom/NodeVector.cpp

/*
 * The Apache Software License, Version 1.1
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 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
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 * modification, are permitted provided that the following conditions
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 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
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 * 5. Products derived from this software may not be called "Apache",
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 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
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/**
 * $Log$
 * Revision 1.1  1999/11/09 01:09:17  twl
 * Initial revision
 *
 * Revision 1.3  1999/11/08 20:44:31  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */

//
//	file:   NodeVector.cpp
//			Implementation of class NodeVector.
//			(Use of STL vector, or equivalent, would have been nice,
//			but is not available.  'NodeImpl *' is the only type
//			kept in Vectors in this DOM implementation, so this is
//			a hardwired implementation for that type.
//

#include "NodeVector.hpp"
#include <assert.h>

NodeVector::NodeVector()
{
	init(10);
};

NodeVector::NodeVector(int size) {
	init(size);
};


void NodeVector::init(int size) {
	assert(size > 0);
	data = new NodeImpl *[size];
	assert(data != 0);
	allocatedSize = size;
	nextFreeSlot = 0;
};


NodeVector::~NodeVector() {
	delete [] data;
};


void NodeVector::addElement(NodeImpl *elem) {
	checkSpace();
	data[nextFreeSlot] = elem;
	++nextFreeSlot;
};


void NodeVector::checkSpace() {
	if (nextFreeSlot == allocatedSize) {
        int grow= allocatedSize/2;
        if (grow < 50) grow = 50;
		int newAllocatedSize = allocatedSize + grow;
		NodeImpl **newData = new NodeImpl *[newAllocatedSize];
		assert(newData != 0);
		for (int i=0; i<allocatedSize; i++) {
			newData[i] = data[i];
		};
		delete [] data;
		allocatedSize = newAllocatedSize;
		data = newData;
	};
};

	
NodeImpl *NodeVector::elementAt(int index) {
	return data[index];
};

NodeImpl *NodeVector::lastElement() {
	if (nextFreeSlot == 0)
		return 0;
	return data[nextFreeSlot-1];
};


void NodeVector::insertElementAt(NodeImpl *elem, int index) {
	int i;

	assert(index <= nextFreeSlot);
	assert(index >= 0);

	checkSpace();
	for (i=nextFreeSlot; i>index; --i) {
		data[i] = data[i-1];
	}
	data[index] = elem;
	++nextFreeSlot;

};


void NodeVector::removeElementAt(int index) {
	assert (index >= 0);
	assert(index < nextFreeSlot);
	for (int i=index; i<nextFreeSlot-1; ++i) {
		data[i] = data[i+1];
	}
	--nextFreeSlot;
};

void NodeVector::reset() {
	nextFreeSlot = 0;
};

void NodeVector::setElementAt(NodeImpl *elem, int index) {
	assert(index >= 0);
	assert(index < nextFreeSlot);
	data[index] = elem;
};


int	NodeVector::size() {
	return nextFreeSlot;
};