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package oracle.toplink.essentials.queryframework;

import oracle.toplink.essentials.internal.localization.ExceptionLocalization;
import oracle.toplink.essentials.sessions.DatabaseRecord;

/**
 * <p><b>Purpose</b>:
 * Concrete class to represent the ColumnResult structure as defined by
 * the EJB 3.0 Persistence specification.  This class is a subcompent of the 
 * EntityResult
 * 
 * @see EntityResult
 * @author Gordon Yorke
 * @since TopLink Java Essentials
 */

public class ColumnResult extends SQLResult{
    
    /** Stores the Columns name from the result set */
    protected String columnName;
    
    public ColumnResult(String column){
        this.columnName = column;
        if (this.columnName == null){
            throw new IllegalArgumentException(ExceptionLocalization.buildMessage("null_value_for_column_result"));
        }
    }
    
    public String getColumnName(){
        return this.columnName;
    }
    
    /**
     * INTERNAL:
     * This method is a convience method for extracting values from Results
     */
    public Object getValueFromRecord(DatabaseRecord record, ResultSetMappingQuery query){
        return record.get(this.columnName);
    }
    
    public boolean isColumnResult(){
        return true;
    }
    
}