/*
* NIST STEP Core Class Library
* clstepcore/STEPattributeList.cc
* April 1997
* K. C. Morris
* David Sauder

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

#include "clstepcore/STEPattributeList.h"
#include "clstepcore/STEPattribute.h"

AttrListNode::AttrListNode( STEPattribute * a ) {
    attr = a;
}

AttrListNode::~AttrListNode() {
}


STEPattributeList::STEPattributeList() {
}

STEPattributeList::~STEPattributeList() {
}

STEPattribute & STEPattributeList::operator []( int n ) {
    int x = 0;
    AttrListNode * a = ( AttrListNode * )head;
    int cnt =  EntryCount();
    if( n < cnt ) {
        while( a && ( x < n ) ) {
            a = ( AttrListNode * )( a->next );
            x++;
        }
    }
    if( a ) {
        return *( a->attr );
    }

    // else - error case: return a static error object to avoid undefined behavior
    // The error object allows calling code to detect the error condition
    static STEPattribute errorAttr;
    cerr << "\nERROR in STEP Core library:  " << __FILE__ <<  ":"
         << __LINE__ << "\n" << _POC_ << "\n\n";
    errorAttr.Error().AppendToDetailMsg( "STEPattributeList::operator[] - index out of bounds" );
    errorAttr.Error().severity( SEVERITY_BUG );
    return errorAttr;
}

int STEPattributeList::list_length() {
    return EntryCount();
}

void STEPattributeList::push( STEPattribute * a ) {
    AttrListNode * a2 = ( AttrListNode * )head;

    // if the attribute already exists in the list, don't push it
    while( a2 ) {
        if( *a == *( a2 -> attr ) ) {
            return;
        }
        a2 = ( AttrListNode * )( a2->next );
    }
    a->incrRefCount();
    AttrListNode * saln = new AttrListNode( a );
    AppendNode( saln );
}