Package commonj.sdo

Interface ChangeSummary

  • All Known Implementing Classes:
    SDOChangeSummary
    public interface ChangeSummary
    A change summary is used to record changes to DataObjects, allowing applications to efficiently and incrementally update back-end storage when required.

    • Method Detail

      • isLogging

        boolean isLogging()
        Indicates whether change logging is on (true) or off (false).
        Returns:
        true if change logging is on.
        See Also:
        beginLogging(), endLogging()

      • isCreated

        boolean isCreated​(DataObject dataObject)
        Returns whether or not the specified data object was created while logging. Any object that was added to the scope but was not in the scope when logging began, will be considered created.
        Parameters:
        dataObject - the data object in question.
        Returns:
        true if the specified data object was created.
        See Also:
        getChangedDataObjects()

      • isDeleted

        boolean isDeleted​(DataObject dataObject)
        Returns whether or not the specified data object was deleted while logging. Any object that is not in scope but was in scope when logging began will be considered deleted.
        Parameters:
        dataObject - the data object in question.
        Returns:
        true if the specified data object was deleted.
        See Also:
        getChangedDataObjects()

      • getOldValues

        List getOldValues​(DataObject dataObject)
        Returns a list of settings that represent the property values of the given dataObject at the point when logging began.

        In the case of a deleted object, the List will include settings for all the Properties.

        An old value setting indicates the value at the point logging begins. A setting is only produced for modified objects if either the old value differs from the current value or if the isSet differs from the current value.

        No settings are produced for created objects.

        Parameters:
        dataObject - the object in question.
        Returns:
        a list of settings.
        See Also:
        getChangedDataObjects()

      • beginLogging

        void beginLogging()
        Clears the List of changes and turns change logging on. No operation occurs if logging is already on.
        See Also:
        endLogging(), isLogging()

      • endLogging

        void endLogging()
        An implementation that requires logging may throw an UnsupportedOperationException. Turns change logging off. No operation occurs if logging is already off.
        See Also:
        beginLogging(), isLogging()

      • isModified

        boolean isModified​(DataObject dataObject)
        Returns whether or not the specified data object was updated while logging. An object that was contained in the scope when logging began and remains in the scope when logging ends will be considered potentially modified.

        An object considered modified must have at least one old value setting.

        Parameters:
        dataObject - the data object in question.
        Returns:
        true if the specified data object was modified.
        See Also:
        getChangedDataObjects()

      • getRootObject

        DataObject getRootObject()
        Returns the ChangeSummary root DataObject - the object from which changes are tracked.
        Returns:
        the ChangeSummary root DataObject

      • getOldValue

        ChangeSummary.Setting getOldValue​(DataObject dataObject,
                                  Property property)
        Returns a setting for the specified property representing the property value of the given dataObject at the point when logging began.

        Returns null if the property was not modified and has not been deleted.

        Parameters:
        dataObject - the object in question.
        property - the property of the object.
        Returns:
        the Setting for the specified property.
        See Also:
        getChangedDataObjects()

      • getOldContainer

        DataObject getOldContainer​(DataObject dataObject)
        Returns the value of the container data object at the point when logging began.
        Parameters:
        dataObject - the object in question.
        Returns:
        the old container data object.

      • getOldContainmentProperty

        Property getOldContainmentProperty​(DataObject dataObject)
        Returns the value of the containment property data object property at the point when logging began.
        Parameters:
        dataObject - the object in question.
        Returns:
        the old containment property.

      • getOldSequence

        Sequence getOldSequence​(DataObject dataObject)
        Returns the value of the sequence for the data object at the point when logging began.
        Parameters:
        dataObject - the object in question.
        Returns:
        the old containment property.

      • undoChanges

        void undoChanges()
        This method is intended for use by service implementations only. Undoes all changes in the log to restore the tree of DataObjects to its original state when logging began. isLogging() is unchanged. The log is cleared.
        See Also:
        beginLogging(), endLogging(), isLogging()