Application: gvSIG desktop

package org.gvsig.expressionevaluator.swing;

import org.gvsig.tools.swing.api.pickercontroller.PickerController;

import org.gvsig.expressionevaluator.Expression;

/**

 *

 * @author jjdelcerro

 */

public interface ExpressionPickerController 

        extends PickerController<Expression>, ExpressionBuilderConfig {

    /**

     * Return the expression in the picker.

     * If a non-null value is assigned as the expression, it will return 

     * this value updated with what the user entered.

     * If a null value is assigned as the expression, when the user did not 

     * enter any value return null. When the user enter values, and the 

     * expression is not empty, it will return a new expression.

     * 

     * @return 

     */

    @Override

    public Expression get();

    public Expression getWithOutHistory();

}