Package kodo.meta

JDO MetaData

See:
Description

Interface Summary

ClassMetaData	Contains JDO meta information about a persistent type.
Commentable	Implementations of this interface can be adorned with comments.
Extensions	Manages metadata extensions.
FieldMetaData	Holds metadata on a particular field.
JDOMetaDataRepository	Repository of JDO metadata.
JDOTypes	Type constants for JDO managed fields.
MetaDataLoader	The JDOMetaDataRepository uses implementations of this interface to load ClassMetaData instances.

Class Summary

DelegatingClassMetaData	Wrapper around an existing class metadata.
DelegatingExtensions	Wrapper around an existing Extensions instance.
DelegatingFieldMetaData	Wrapper around an existing field metadata.
DelegatingJDOMetaDataRepository	Wrapper around a repository.
JDOMetaDataGenerator	Generates default JDO metadata for a given class.
JDOMetaDataParser	Custom SAX parser used by the system to quickly parse JDO metadata files.
JDOMetaDataTool	Tool for generating default JDO metadata.
QueryMetaData	Holds metadata about named queries.
QueryMetaDataParser	Custom SAX parser used by the system to parse JDO metadata files for named queries.
QueryMetaDataRepository	Repository for QueryMetaData instances.

Package kodo.meta Description

JDO MetaData

This package provides an extendable framework for parsing JDO metadata. The metadata can be accessed at both enhancement time and at runtime. The framework uses caching and a fast SAX parser to reduce the overhead involved in finding and parsing the metadata for each JDO type.

Typical usage involves getting a ClassMetaData via a call to one of the KodoHelper.getMetaData() methods:

import kodo.meta.ClassMetaData;
import kodo.meta.FieldMetaData;
import kodo.meta.FieldMetaData.MANAGE_PERSISTENT;
import kodo.runtime.KodoHelper;

...

ClassMetaData orderMeta = KodoHelper.getMetaData (pm, Order.class);
FieldMetaData[] fields = orderMeta.getFields ();
for (FieldMetaData fmd : fields)
    System.out.printf ("field %s %s persistent.\n", fmd.getName (), 
        (fmd.getManagement () == MANAGE_PERSISTENT ? "is" : "is not");