Name	method, %	comment, %	TODO	@see
smallsql.database.Column	24	10,2%   (312/2749)	0	0

/* =============================================================
 * SmallSQL : a free Java DBMS library for the Java(tm) platform
 * =============================================================
 *
 * (C) Copyright 2004-2006, by Volker Berlin.
 *
 * Project Info:  http://www.smallsql.de/
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * ---------------
 * Column.java
 * ---------------
 * Author: Volker Berlin
 * 
 */
package smallsql.database;

import java.io.*;
import java.sql.*;


public class Column implements Cloneable{

    //private Expression value;
    private Expression defaultValue = Expression.NULL; // Default value for INSERT
    private String defaultDefinition; // String representation for Default Value
    private String name;
    //private String tableAlias; // für SELECT Syntax tableAlias.colName
    //private String colName; // Name der Tabellenspalte
    private boolean identity;
    private boolean caseSensitive;
    private boolean nullable = true;
    private int scale;
    private int precision;
    private int dataType;
    private Identity counter; // counter for identity values

    Column(){}
    
    
    void setName( String name ){
        this.name = name;
    }


    void setDefaultValue(Expression defaultValue, String defaultDefinition){
        this.defaultValue 		= defaultValue;
        this.defaultDefinition	= defaultDefinition;
    }

    Expression getDefaultValue(SSConnection con) throws SQLException{
    	if(identity)
    		counter.createNextValue(con);
        return defaultValue;
    }

	String getDefaultDefinition(){
		return defaultDefinition;
	}

    String getName(){
        return name;
    }

    boolean isAutoIncrement(){
        return identity;
    }

    void setAutoIncrement(boolean identity){
        this.identity = identity;
    }
    
    int initAutoIncrement( Table table, RandomAccessFile raFile, long filePos) throws IOException{
    	if(identity){
			counter = new Identity( table, raFile, filePos);
			defaultValue = new ExpressionValue( counter, SQLTokenizer.BIGINT );
    	}
    	return 8;
    }
    
    void setNewAutoIncrementValue(Expression obj) throws Exception{
		if(identity){
			counter.setNextValue(obj);
		}
    }

    boolean isCaseSensitive(){
        return caseSensitive;
    }

    void setNullable(boolean nullable){
        this.nullable = nullable;
    }

    boolean isNullable(){
        return nullable;
    }

    void setDataType(int dataType){
        this.dataType = dataType;
    }

    int getDataType(){
        return dataType;
    }


    int getDisplaySize(){
		return SSResultSetMetaData.getDisplaySize( dataType, precision, scale);
    }

    void setScale(int scale){
        this.scale = scale;
    }

    int getScale(){
		switch(dataType){
			case SQLTokenizer.DECIMAL:
			case SQLTokenizer.NUMERIC:
				return scale;
			default:
				return Expression.getScale(dataType);
		}
    }

    void setPrecision(int precision) throws SQLException{
	    if(precision<0) throw Utils.createSQLException("Invalid column size " + precision + " for column '"+name+"'");
        this.precision = precision;
    }

    int getPrecision(){
		return SSResultSetMetaData.getDataTypePrecision( dataType, precision );
    }

    int getColumnSize(){
    	if(SSResultSetMetaData.isNumberDataType(dataType))
    		 return getPrecision();
    	else return getDisplaySize();
    }
	

    int getFlag(){
        return (identity        ? 1 : 0) |
               (caseSensitive   ? 2 : 0) |
               (nullable        ? 4 : 0);
    }
	

    void setFlag(int flag){
        identity        = (flag & 1) > 0;
        caseSensitive   = (flag & 2) > 0;
        nullable        = (flag & 4) > 0;
    }
	

    Column copy(){
    	try{
    		return (Column)clone();
    	}catch(Exception e){return null;}
    	
    }
}