com.sleepycat.persist.evolve
Class Deleter

java.lang.Object
  com.sleepycat.persist.evolve.Mutation
      com.sleepycat.persist.evolve.Deleter

All Implemented Interfaces:

Serializable

public class Deleter
extends Mutation

A mutation for deleting an entity class or field.

WARNING: The data for the deleted class or field will be destroyed and will be recoverable only by restoring from backup. If you wish to convert the instance data to a different type or format, use a Conversion mutation instead.

For example, to delete a field:

  package my.package;

  // The old class.  Version 0 is implied.
  //
  @Entity
  class Person {
      String name;
      String favoriteColors;
  }

  // The new class.  A new version number must be assigned.
  //
  @Entity(version=1)
  class Person {
      String name;
  }

  // Add the mutation for deleting a field.
  //
  Mutations mutations = new Mutations();

  mutations.addDeleter(new Deleter(Person.class.getName(), 0,
                                   "favoriteColors");

  // Configure the mutations as described here.

To delete an entity class:

  package my.package;

  // The old class.  Version 0 is implied.
  //
  @Entity
  class Statistics {
      ...
  }

  // Add the mutation for deleting a class.
  //
  Mutations mutations = new Mutations();

  mutations.addDeleter(new Deleter("my.package.Statistics", 0));

  // Configure the mutations as described here.

See Also:

Class Evolution, Serialized Form

Deleter

public Deleter(String className,
               int classVersion)

Creates a mutation for deleting an entity class.

Deleter

public Deleter(String declaringClass,
               int declaringClassVersion,
               String fieldName)

Creates a mutation for deleting the given field from all instances of the given class version.

toString

public String toString()

Overrides:

toString in class Mutation