package eu.dnetlib.functionality.index.model;

import java.util.Date;

/**
 * Interface for a value object, used if the any object is of type string, double, boolean, long, date or date time.
 */
public interface Value extends Any {

	/**
	 * @return The string representation
	 */
	String asString();

	/**
	 * @return The double representation, an InvalidValueTypeException is thrown if the value is not a number. If value
	 *         is a string then this is tried to be converted to a Double.
	 */
	Double asDouble();

	/**
	 * @return The long representation, an InvalidValueTypeException is thrown if the value is not a number. If value is
	 *         a string then this is tried to be converted to a Long.
	 */
	Long asLong();

	/**
	 * @return The boolean representation, an InvalidValueTypeException is thrown if the value is not of type boolean.
	 *         If value is a string then this is tried to be converted to a boolean.
	 */
	Boolean asBoolean();

	/**
	 * @return The date representation, an InvalidValueTypeException is thrown if the value is not of type date or
	 *         datetime. If value is a string then this is tried to be converted to a date.
	 */
	Date asDate();

	/**
	 * @return The date time representation, an InvalidValueTypeException is thrown if the value is not of type
	 *         datetime. If value is a string then this is tried to be converted to a datetime.
	 */
	Date asDateTime();

	/**
	 * @return the value object
	 */
	Object getObject();
}