ClassMetadata (Oracle - Berkeley DB Java API)
Date: 2010-04-12

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## com.sleepycat.persist.model
Class ClassMetadata

    java.lang.Object
      com.sleepycat.persist.model.ClassMetadata

All Implemented Interfaces:
  Serializable

    public class ClassMetadata

extends Object
implements Serializable

The metadata for a persistent class. A persistent class may be specified with the `Entity` or `Persistent` annotation.

`ClassMetadata` objects are thread-safe. Multiple threads may safely call the methods of a shared `ClassMetadata` object.

This and other metadata classes are classes rather than interfaces to allow adding properties to the model at a future date without causing incompatibilities. Any such property will be given a default value and its use will be optional.

See Also:
  Serialized Form

Constructor Summary
`ClassMetadata(String className, int version, String proxiedClassName, boolean entityClass, PrimaryKeyMetadata primaryKey, Map<String,SecondaryKeyMetadata> secondaryKeys, List<FieldMetadata> compositeKeyFields)` Used by an `EntityModel` to construct persistent class metadata.
`ClassMetadata(String className, int version, String proxiedClassName, boolean entityClass, PrimaryKeyMetadata primaryKey, Map<String,SecondaryKeyMetadata> secondaryKeys, List<FieldMetadata> compositeKeyFields, Collection<FieldMetadata> persistentFields)` Used by an `EntityModel` to construct persistent class metadata.

Method Summary
`boolean` | `equals(Object other)`
`String` | `getClassName()` Returns the name of the persistent class.
`List<FieldMetadata>` | `getCompositeKeyFields()` Returns an unmodifiable list of metadata for the fields making up a composite key, or null if this is a not a composite key class.
`Collection<FieldMetadata>` | `getPersistentFields()` Returns an unmodifiable list of metadata for the persistent fields in this class, or null if the default rules for persistent fields should be used.
`PrimaryKeyMetadata` | `getPrimaryKey()` Returns the primary key metadata for a key declared in this class, or null if none is declared.
`String` | `getProxiedClassName()` Returns the class name of the proxied class if this class is a `PersistentProxy`, or null otherwise.
`Map<String,SecondaryKeyMetadata>` | `getSecondaryKeys()` Returns an unmodifiable map of key name (which may be different from field name) to secondary key metadata for all secondary keys declared in this class, or null if no secondary keys are declared in this class.
`int` | `getVersion()` Returns the version of this persistent class.
`int` | `hashCode()`
`boolean` | `isEntityClass()` Returns whether this class is an entity class.

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ClassMetadata

    public ClassMetadata(String className,
                         int version,
                         String proxiedClassName,
                         boolean entityClass,
                         PrimaryKeyMetadata primaryKey,
                         Map<String,SecondaryKeyMetadata> secondaryKeys,
                         List<FieldMetadata> compositeKeyFields)

  Used by an `EntityModel` to construct persistent class metadata. The optional `getPersistentFields()` property will be set to null.

### ClassMetadata

    public ClassMetadata(String className,
                         int version,
                         String proxiedClassName,
                         boolean entityClass,
                         PrimaryKeyMetadata primaryKey,
                         Map<String,SecondaryKeyMetadata> secondaryKeys,
                         List<FieldMetadata> compositeKeyFields,
                         Collection<FieldMetadata> persistentFields)

  Used by an `EntityModel` to construct persistent class metadata.

Method Detail

### getClassName

    public String getClassName()

  Returns the name of the persistent class.

### getVersion

    public int getVersion()

  Returns the version of this persistent class. This may be specified using the `Entity.version()` or `Persistent.version()` annotation.

### getProxiedClassName

    public String getProxiedClassName()

  Returns the class name of the proxied class if this class is a `PersistentProxy`, or null otherwise.

### isEntityClass

    public boolean isEntityClass()

  Returns whether this class is an entity class.

### getPrimaryKey

    public PrimaryKeyMetadata getPrimaryKey()

  Returns the primary key metadata for a key declared in this class, or null if none is declared. This may be specified using the `PrimaryKey` annotation.

### getSecondaryKeys

    public Map<String,SecondaryKeyMetadata> getSecondaryKeys()

  Returns an unmodifiable map of key name (which may be different from field name) to secondary key metadata for all secondary keys declared in this class, or null if no secondary keys are declared in this class. This metadata may be specified using `SecondaryKey` annotations.

### getCompositeKeyFields

    public List<FieldMetadata> getCompositeKeyFields()

  Returns an unmodifiable list of metadata for the fields making up a composite key, or null if this is a not a composite key class. The order of the fields in the returned list determines their stored order and may be specified using the `KeyField` annotation. When the composite key class does not implement `Comparable`, the order of the fields is the relative sort order.

### getPersistentFields

    public Collection<FieldMetadata> getPersistentFields()

  Returns an unmodifiable list of metadata for the persistent fields in this class, or null if the default rules for persistent fields should be used. All fields returned must be declared in this class and must be non-static.

  By default (if null is returned) the persistent fields of a class will be all declared instance fields that are non-transient (are not declared with the `transient` keyword). The default rules may be overridden by an `EntityModel`. For example, the `AnnotationModel` overrides the default rules when the `NotPersistent` or `NotTransient` annotation is specified.

### equals

    public boolean equals(Object other)

  Overrides:
    `equals` in class `Object`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`

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