com.sleepycat.persist.evolve

Class Deleter

java.lang.Object

com.sleepycat.persist.evolve.Mutation

com.sleepycat.persist.evolve.Deleter

All Implemented Interfaces:

java.io.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.

Author:

Mark Hayes

See Also:

Class Evolution, Serialized Form

Constructor Summary

Constructors

Constructor and Description
Deleter(java.lang.String className, int classVersion) Creates a mutation for deleting an entity class.
Deleter(java.lang.String declaringClass, int declaringClassVersion, java.lang.String fieldName) Creates a mutation for deleting the given field from all instances of the given class version.

Method Summary

Modifier and Type	Method and Description
java.lang.String	toString()

Methods inherited from class com.sleepycat.persist.evolve.Mutation

equals, getClassName, getClassVersion, getFieldName, hashCode

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Deleter

public Deleter(java.lang.String className,
               int classVersion)

Creates a mutation for deleting an entity class.

Parameters:

className - the class to which this mutation applies.

classVersion - the class version to which this mutation applies.

Deleter

public Deleter(java.lang.String declaringClass,
               int declaringClassVersion,
               java.lang.String fieldName)

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

Parameters:

declaringClass - the class to which this mutation applies.

declaringClassVersion - the class version to which this mutation applies.

fieldName - field name to which this mutation applies.

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class Mutation