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/** @file
	Parser: table class.

	Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/

static const char* IDENT_TABLE_C="$Date: 2003/03/19 16:28:09 $";

#include "pa_table.h"

#include "pa_exception.h"

Table::Table(columns_type acolumns, int initial_rows):
	Array<element_type>(initial_rows),

	fcurrent(0),
	fcolumns(acolumns), 
	name2number(new name2number_hash_class) {

	if(fcolumns)
		for(int i=0; i<fcolumns->count(); i++) {
			const String& name=*fcolumns->get(i);
			name2number->put(name, i+1);
		}
}

Table::Table(const Table& src, int offset, int limit) :
	Array<element_type>(limit/*may be more than needed, no harm done*/),

	fcurrent(0),
	fcolumns(src.fcolumns),
	name2number(src.name2number) {

	append(src, offset, limit);
}

int Table::column_name2index(const String& column_name, bool bark) const {
	if(fcolumns) {// named
		int result=name2number->get(column_name)-1; // -1 = column not found
		if(bark && result<0)
			throw Exception("parser.runtime",
				&column_name,
				"column not found");
		return result;
	} else // nameless
		return column_name.as_int();
}

const String* Table::item(int column) {
	if(valid(fcurrent)) {
		element_type row=get(fcurrent);
		if(column>=0 && column<row->count()) // proper index?
			return row->get(column);
	}
	return 0; // it's OK we don't have row|column, just return nothing
}

bool Table::locate(int column, const String& value) {
	int scurrent=fcurrent;
	for(fcurrent=0; fcurrent<count(); fcurrent++) {
		const String* item_value=item(column);
		if(*item_value == value)
			return true;
	}

	fcurrent=scurrent;
	return false;
}

bool Table::locate(const String& column, const String& value) {
	return locate(column_name2index(column, true), value);
}

void Table::offset(bool absolute, int offset) {
	if(count())
		fcurrent=((absolute?0:fcurrent)+offset+count())%count();
}