
/*
* NIST Utils Class Library
* clutils/gennodearray.h
* April 1997
* David Sauder
* K. C. Morris

* Development of this software was funded by the United States Government,
* and is not subject to copyright.
*/

/* $Id: gennodearray.cc,v 3.0.1.4 1997/11/05 22:33:48 sauderd DP3.1 $  */

#ifdef HAVE_CONFIG_H
# include <scl_cf.h>
#endif

#include <gennode.h>
#include <gennodelist.h>
#include <gennodearray.h>

#ifndef HAVE_MEMMOVE
extern "C" {
    extern void * memmove( void *, const void *, size_t );
}
#endif

GenericNode::GenericNode() {
    next = 0;
    prev = 0;
}

GenericNode::~GenericNode() {
    Remove();
}

GenNodeArray::GenNodeArray( int defaultSize ) {
    _bufsize = defaultSize;
    _buf = new GenericNode*[_bufsize];
    memset( _buf, 0, _bufsize * sizeof( GenericNode * ) );
    _count = 0;
}

GenNodeArray::~GenNodeArray() {
    delete [] _buf;
}

int GenNodeArray::Index( GenericNode ** gn ) {
    return ( ( gn - _buf ) / sizeof( GenericNode * ) );
}

void GenNodeArray::Append( GenericNode * gn ) {
    Insert( gn, _count );
}

int GenNodeArray::Insert( GenericNode * gn ) {
    return Insert( gn, _count );
}

void
GenNodeArray::Check( int index ) {
    GenericNode ** newbuf;

    if( index >= _bufsize ) {
        _bufsize = ( index + 1 ) * 2;
        newbuf = new GenericNode*[_bufsize];

        memset( newbuf, 0, _bufsize );
        memmove( newbuf, _buf, _count * sizeof( GenericNode * ) );
        delete [] _buf;
        _buf = newbuf;
    }
}

int
GenNodeArray::Insert( GenericNode * gn, int index ) {
    const GenericNode ** spot;
    index = ( index < 0 ) ? _count : index;

    if( index < _count ) {
        Check( _count + 1 );
        spot = ( const GenericNode ** )&_buf[index];
        memmove( spot + 1, spot, ( _count - index )*sizeof( GenericNode * ) );

    } else {
        Check( index );
        spot = ( const GenericNode ** )&_buf[index];
    }
    *spot = gn;
    ++_count;
    return index;
}

void
GenNodeArray::Remove( int index ) {
    if( 0 <= index && index < _count ) {
        --_count;
        const GenericNode ** spot = ( const GenericNode ** )&_buf[index];
        memmove( spot, spot + 1, ( _count - index )*sizeof( GenericNode * ) );
        _buf[_count] = 0;
    }
}

void GenNodeArray::ClearEntries() {
    int i;
    for( i = 0 ; i < _count; i++ ) {
        _buf[i] = 0;
    }
    _count = 0;
}

void GenNodeArray::DeleteEntries() {
    int i;
    for( i = 0 ; i < _count; i++ ) {
        delete( _buf[i] );
    }
    _count = 0;
}


int GenNodeArray::Index( GenericNode * gn ) {
    for( int i = 0; i < _count; ++i ) {
        if( _buf[i] == gn ) {
            return i;
        }
    }
    return -1;
}

