Package 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.

See Also:
  `Class Evolution`, Serialized Form

### Constructor Summary

Constructors
`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

All Methods Instance Methods Concrete Methods
`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`