ch.agent.crnickl.impl

Interface UpdatableSchemaVisitor

public interface UpdatableSchemaVisitor

UpdatableSchemaVisitor defines a visitor pattern for schema updates. Callback methods are invoked for each chronicle attribute definition, series definition, and series attribute definition, which was deleted or updated.

Author:

Jean-Paul Vetterli

Method Summary

Modifier and Type	Method and Description
void	visit(UpdatableSchema schema, SeriesDefinition seriesDef, AttributeDefinition<?> attrDef, AttributeDefinition<?> origAttrDef) Visit an attribute definition of a chronicle or a series.
void	visit(UpdatableSchema schema, SeriesDefinition def, SeriesDefinition original) Visit a series definition.

Method Detail

visit

void visit(UpdatableSchema schema,
           SeriesDefinition def,
           SeriesDefinition original)
    throws T2DBException

Visit a series definition. The new and old definitions are passed as arguments. The old definition is null when creating and the new definition is null when deleting. All other cases are updates. The method is never called with two null arguments.

Parameters:

schema - the schema to which the definitions belong

def - the new definition, or null if deleted

original - the old definition, or null if a new definition is created

Throws:

T2DBException

visit

void visit(UpdatableSchema schema,
           SeriesDefinition seriesDef,
           AttributeDefinition<?> attrDef,
           AttributeDefinition<?> origAttrDef)
    throws T2DBException

Visit an attribute definition of a chronicle or a series. The new and old definitions are passed as arguments. The old definition is null when creating and the new definition is null when deleting. All other cases are updates. The method is never called with two null arguments.

Parameters:

schema - the schema to which the definitions belong

seriesDef - a series definition, or null for a chronicle attribute

attrDef - the new attribute definition, or null if deleted

origAttrDef - the old attribute, or null if a new definition is created

Throws:

T2DBException