com.allanbank.mongodb.bson.element

Class UuidElement

java.lang.Object

com.allanbank.mongodb.bson.element.AbstractElement

com.allanbank.mongodb.bson.element.BinaryElement

com.allanbank.mongodb.bson.element.UuidElement

All Implemented Interfaces:

Element, ElementAssignable, Serializable

public class UuidElement
extends BinaryElement

UuidElement provides a helper element for handling UUID BinaryElement sub-types.

If no sub-type is provided this class defaults to the standardized sub-type 4 binary element which encodes the UUID from most significant byte to least significant byte. If the deprecated sub-type 3 is specified this class assumes the legacy Java encoding of the UUID which encodes the most significant long in least-significant-byte order and then the least significant long in least-significant-byte order.

See Also:

Serialized Form

API Notice:

This class is part of the driver's API. Public and protected members will be deprecated for at least 1 non-bugfix release (version numbers are <major>.<minor>.<bugfix>) before being removed or modified.

Copyright ©:

2012-2013, Allanbank Consulting, Inc., All Rights Reserved

Field Summary

Fields

Modifier and Type	Field and Description
static byte	LEGACY_UUID_SUBTTYPE The legacy (reverse byte order for high and low long values) subtype for the UUID.
static int	UUID_BINARY_LENGTH The length for the UUID binary value.
static byte	UUID_SUBTTYPE The default subtype for the UUID.

Fields inherited from class com.allanbank.mongodb.bson.element.BinaryElement

DEFAULT_SUB_TYPE, TYPE

Fields inherited from class com.allanbank.mongodb.bson.element.AbstractElement

ELEMENT_TYPE

Constructor Summary

Constructors

Constructor and Description
UuidElement(String name, byte subType, byte[] value) Creates a new UuidElement.
UuidElement(String name, byte subType, UUID value) Creates a new UuidElement.
UuidElement(String name, UUID value) Creates a new UuidElement.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object object) Determines if the passed object is of this same type as this object and if so that its fields are equal.
UUID	getUuid() Returns the UUID value.
UUID	getValueAsObject() Returns the value for BSON element as a Java Object type.
String	getValueAsString() Returns the value for BSON element as a Java String.
int	hashCode() Computes a reasonable hash code.
UuidElement	withName(String name) Creates a new element with the same type and value as this element but with the specified name.

Methods inherited from class com.allanbank.mongodb.bson.element.BinaryElement

accept, getSubType, getType, getValue

Methods inherited from class com.allanbank.mongodb.bson.element.AbstractElement

asElement, find, find, findFirst, findFirst, getName, nullSafeEquals, queryPath, queryPath, toString

Methods inherited from class java.lang.Object

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

Field Detail

LEGACY_UUID_SUBTTYPE

public static final byte LEGACY_UUID_SUBTTYPE

The legacy (reverse byte order for high and low long values) subtype for the UUID.

See Also:

Constant Field Values

UUID_BINARY_LENGTH

public static final int UUID_BINARY_LENGTH

The length for the UUID binary value.

See Also:

Constant Field Values

UUID_SUBTTYPE

public static final byte UUID_SUBTTYPE

The default subtype for the UUID.

See Also:

Constant Field Values

Constructor Detail

UuidElement

public UuidElement(String name,
           byte subType,
           byte[] value)

Creates a new UuidElement.

Parameters:

name - The name for the element.

subType - The subtype for the UUID element.

value - The UUID bytes for the element.

Throws:

IllegalArgumentException - If the name or value is null. If the subType is not UUID_SUBTTYPE or LEGACY_UUID_SUBTTYPE. If the value is not a 16 bytes long.

UuidElement

public UuidElement(String name,
           byte subType,
           UUID value)

Creates a new UuidElement.

Parameters:

name - The name for the element.

subType - The subtype for the UUID element.

value - The UUID value for the element.

Throws:

IllegalArgumentException - If the name or value is null.

UuidElement

public UuidElement(String name,
           UUID value)

Creates a new UuidElement.

Parameters:

name - The name for the element.

value - The UUID value for the element.

Throws:

IllegalArgumentException - If the name or value is null.

Method Detail

equals

public boolean equals(Object object)

Determines if the passed object is of this same type as this object and if so that its fields are equal.

Overrides:

equals in class BinaryElement

Parameters:

object - The object to compare to.

See Also:

Object.equals(java.lang.Object)

getUuid

public UUID getUuid()

Returns the UUID value.

Returns:

The UUID value.

getValueAsObject

public UUID getValueAsObject()

Returns the value for BSON element as a Java Object type.

Automatic conversion from the Object-ified value to an element is provided via the DocumentBuilder.add(String, Object) method. Not all element types will be successfully converted to the same element duing a Element-->Object value-->Element conversion. This cases are noted in the appropriate sub-type's JavaDoc.

Sub-types will also overload this method with the appropriate type returned. e.g., The StringElement.getValueAsObject() method signature returns a String.

Returns a byte[].

Note: This value will not be recreated is a Object-->Element conversion. The sub type is lost in this conversion to an Object.

Implementation Note: The return type cannot be a byte[] here as UuidElement returns a UUID.

Returns the UUID value.

Note: This value will not be recreated is a Object-->Element conversion. The sub type is lost in this conversion to an Object.

Specified by:

getValueAsObject in interface Element

Overrides:

getValueAsObject in class BinaryElement

Returns:

The value for BSON element as a Java Object type.

getValueAsString

public String getValueAsString()

Returns the value for BSON element as a Java String. Automatic conversion from the string value back to an Element is not provided.

Generally the string returned will be the expected value. As an example for a LongElement with the value 101 the returned string will be "101". In those cases where there is not canonical form for the value (e.g., a TimestampElement the returned string will match the value when converted to JSON by the JsonSerializationVisitor. For a TimestampElement that is a string of the form "ISODate('1970-01-01T00:00:00.000+0000')".

Uses the JsonSerializationVisitor to encode the value. In some cases it will be more efficient to override this method with a more straight forward conversion.

Returns the result of the UUID.toString().

Specified by:

getValueAsString in interface Element

Overrides:

getValueAsString in class AbstractElement

Returns:

The value for BSON element as a String.

hashCode

public int hashCode()

Computes a reasonable hash code.

Overrides:

hashCode in class BinaryElement

Returns:

The hash code value.

withName

public UuidElement withName(String name)

Creates a new element with the same type and value as this element but with the specified name. This is useful when creating a query across a set of collections where the filed name changes in the collections but the values must be identical.

Returns a new BinaryElement.

Returns a new BinaryElement.

Specified by:

withName in interface Element

Overrides:

withName in class BinaryElement

Parameters:

name - The new name for the element.

Returns:

The created element.