com.db4o.internal

Class StoredFieldImpl

java.lang.Object

com.db4o.internal.StoredFieldImpl

All Implemented Interfaces:

StoredField

public class StoredFieldImpl
extends java.lang.Object
implements StoredField

Constructor Summary

Constructors

Constructor and Description
StoredFieldImpl(Transaction transaction, FieldMetadata fieldMetadata)

Method Summary

Methods

Modifier and Type	Method and Description
void	createIndex() creates an index on this field at runtime.
void	dropIndex() drops an existing index on this field at runtime.
boolean	equals(java.lang.Object obj)
FieldMetadata	fieldMetadata()
java.lang.Object	get(java.lang.Object onObject) returns the field value on the passed object.
java.lang.String	getName() returns the name of the field.
ReflectClass	getStoredType() returns the Class (Java) / Type (.NET) of the field.
int	hashCode()
boolean	hasIndex() Returns whether this field has an index or not.
boolean	isArray() returns true if the field is an array.
void	rename(java.lang.String name) modifies the name of this stored field.
void	traverseValues(Visitor4 visitor) specialized highspeed API to collect all values of a field for all instances of a class, if the field is indexed.

Methods inherited from class java.lang.Object

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

Constructor Detail

StoredFieldImpl

public StoredFieldImpl(Transaction transaction,
               FieldMetadata fieldMetadata)

Method Detail

createIndex

public void createIndex()

Description copied from interface: StoredField

creates an index on this field at runtime.

Specified by:

createIndex in interface StoredField

dropIndex

public void dropIndex()

Description copied from interface: StoredField

drops an existing index on this field at runtime.

Specified by:

dropIndex in interface StoredField

fieldMetadata

public FieldMetadata fieldMetadata()

get

public java.lang.Object get(java.lang.Object onObject)

Description copied from interface: StoredField

returns the field value on the passed object.

This method will also work, if the field is not present in the current version of the class.

It is recommended to use this method for refactoring purposes, if fields are removed and the field values need to be copied to other fields.

Specified by:

get in interface StoredField

getName

public java.lang.String getName()

Description copied from interface: StoredField

returns the name of the field.

Specified by:

getName in interface StoredField

getStoredType

public ReflectClass getStoredType()

Description copied from interface: StoredField

returns the Class (Java) / Type (.NET) of the field.

For array fields this method will return the type of the array. Use StoredField.isArray() to detect arrays.

Specified by:

getStoredType in interface StoredField

hasIndex

public boolean hasIndex()

Description copied from interface: StoredField

Returns whether this field has an index or not.

Specified by:

hasIndex in interface StoredField

Returns:

true if this field has an index.

isArray

public boolean isArray()

Description copied from interface: StoredField

returns true if the field is an array.

Specified by:

isArray in interface StoredField

rename

public void rename(java.lang.String name)

Description copied from interface: StoredField

modifies the name of this stored field.

After renaming one or multiple fields the ObjectContainer has to be closed and reopened to allow internal caches to be refreshed.

Specified by:

rename in interface StoredField

Parameters:

name - the new name

traverseValues

public void traverseValues(Visitor4 visitor)

Description copied from interface: StoredField

specialized highspeed API to collect all values of a field for all instances of a class, if the field is indexed.

The field values will be taken directly from the index without the detour through class indexes or object instantiation.

If this method is used to get the values of a first class object index, deactivated objects will be passed to the visitor.

Specified by:

traverseValues in interface StoredField

Parameters:

visitor - the visitor to be called with each index value.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object