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package oracle.toplink.essentials.indirection;

/**
 * INTERNAL:
 * This interface defines funtionality required by ValueHolders for OneToOneMappings that 
 * have LAZY access weaved into them and use Property (method) based access
 * 
 * The weaving feature adds a paralell valueholder to the class it weaves and uses that valueholder
 * to control the lazy loading.  The methods on this interface provide information about how that weaved
 * valueholder is related to the underlying value.
 * @author tware
 *
 */
public interface WeavedAttributeValueHolderInterface extends ValueHolderInterface {

    /**
     * When a valueholder is triggered, the weaved code will ensure its value is 
     * coordinated with the underlying property.  This method allows TopLink to determine
     * if that has happened.
     * @return
     */
    public boolean isCoordinatedWithProperty();
    
    /**
     * TopLink will call this method when the triggering of a weaved valueholder causes it's
     * value to be coordinated with the underlying property
     */
    public void setIsCoordinatedWithProperty(boolean coordinated);
    
    /**
     * This method returns whether this valueholder has been newly instantiated by weaved code.
     * @return
     */
    public boolean isNewlyWeavedValueHolder();
    
    /**
     * TopLink weaving calls this method on any valueholder it weaves into a class to indicate
     * that it is new and it's value should not be considered.  The method is also called when coordination
     * with the underlying value occurs to indicate the value can now be trusted.
     * @param isNew
     */
    public void setIsNewlyWeavedValueHolder(boolean isNew);
}