package frame.object.meta;

import java.sql.SQLException;
import java.sql.Types;
import java.util.ArrayList;
import java.util.List;


public class MetaFieldReader implements IFieldReader {

	private static List<MetaField> fields;
	private MetaField field;
	private int pos;
	
	static {
		init();
	}
	
	
	public MetaFieldReader() {
		pos = -1;
	}
	
	@Override
	public boolean next() throws SQLException {
		pos++;
		
		if (pos < fields.size()) {
			field = fields.get(pos);
			return true;
		}
		else {
			return false;
		}
	}

	@Override
	public String getFieldName() throws SQLException {
		if (field == null) {
			return null;
		}
		
		return field.getFieldName();
	}

	@Override
	public int getFieldType() throws SQLException {
		if (field == null) {
			return Types.VARCHAR;
		}
		
		return field.getFieldType();
	}

	@Override
	public int getFieldLength() throws SQLException {
		if (field == null) {
			return 0;
		}
		
		return field.getFieldLength();
	}

	@Override
	public int getNullable() throws SQLException {
		if (field == null) {
			return 1;
		}
		
		return field.getNullable();
	}

	@Override
	public void first() {
		pos = -1;
	}
	
	private static void init() {
		fields = new ArrayList<MetaField>();
		fields.add(new MetaField("fieldName", Types.VARCHAR, 64, 0));
		fields.add(new MetaField("fieldType", Types.VARCHAR, 0, 0));
		fields.add(new MetaField("fieldLength", Types.INTEGER, 0, 0));
		fields.add(new MetaField("nullable", Types.VARCHAR, 0, 0));
		fields.add(new MetaField("displayName", Types.VARCHAR, 64, 0));
	}

}