/**
 * Copyright (c) 2014, the Railo Company Ltd.
 * Copyright (c) 2015, Lucee Assosication Switzerland
 *
 * 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, see <http://www.gnu.org/licenses/>.
 * 
 */
package lucee.runtime.sql.exp;

import lucee.runtime.exp.PageException;
import lucee.runtime.type.Collection;
import lucee.runtime.type.KeyImpl;
import lucee.runtime.type.Query;
import lucee.runtime.type.QueryColumn;
import lucee.runtime.type.util.QueryUtil;


public class ColumnExpression extends ExpressionSupport implements Column {

	private String table;
	private String column;
	private boolean hasBracked;
	private int columnIndex;
	private QueryColumn col;
	
	@Override
	public String toString(){
		return "table:"+table+";column:"+column+";hasBracked:"+hasBracked+";columnIndex:"+columnIndex;
		
	}

	public ColumnExpression(String value, int columnIndex) {
		this.column=value;
		this.columnIndex=columnIndex;
	}

	public void setSub(String sub) {
		if(table==null) {
			table=column;
			column=sub;
		}
		else column=(column+"."+sub);
	}

	@Override
	public String toString(boolean noAlias) {
		if(hasAlias() && !noAlias) return getFullName()+" as "+getAlias();
		return getFullName();
	}

	@Override
	public String getFullName() {
		if(table==null) return column;
		return table+"."+column;
	}

	@Override
	public String getAlias() {
		if(!hasAlias()) return getColumn().getString();
		return super.getAlias();
	}

	@Override
	public Collection.Key getColumn() {
		return KeyImpl.init(column);
	}

	@Override
	public String getTable() {
		return table;
	}

	@Override
	public boolean hasBracked() {
		return hasBracked;
	}

	@Override
	public void hasBracked(boolean b) {
		this.hasBracked=b;
	}

    public String getColumnName() {

        return column;
    }

	/**
	 * @return the columnIndex
	 */
	@Override
	public int getColumnIndex() {
		return columnIndex;
	}
	// MUST hanle null correctly
	@Override
	public Object getValue(Query qr, int row) throws PageException {
		if(col==null)col = qr.getColumn(getColumn());
		return QueryUtil.getValue(col,row);
	}
	
	@Override
	public Object getValue(Query qr, int row, Object defaultValue) {
		if(col==null){
			col = qr.getColumn(getColumn(),null);
			if(col==null) return defaultValue;
		}
		return col.get(row,defaultValue);
	}

}