com.allanbank.mongodb.builder.expression

Class UnaryExpression

java.lang.Object

com.allanbank.mongodb.builder.expression.UnaryExpression

All Implemented Interfaces:

ElementAssignable, Expression

public class UnaryExpression
extends Object
implements Expression, ElementAssignable

UnaryExpression provides an implementation of an Expression with 1 operand.

API Warning:

This class is NOT part of the drivers API. This class may be mutated in incompatible ways between any two releases of the driver.

Copyright ©:

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

Field Summary

Fields

Modifier and Type	Field and Description
protected Expression	myExpression The sub expression.
protected String	myOperator The operator.

Constructor Summary

Constructors

Constructor and Description
UnaryExpression(String operator, Expression expression) Creates a new NaryExpression.

Method Summary

Methods

Modifier and Type	Method and Description
Element	asElement() Converts the object into an Element.
DocumentElement	toElement(String name) Returns the expression in the form of a BSON element.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

myExpression

protected final Expression myExpression

The sub expression.

myOperator

protected final String myOperator

The operator.

Constructor Detail

UnaryExpression

public UnaryExpression(String operator,
               Expression expression)

Creates a new NaryExpression.

Parameters:

operator - The operator this object represents.

expression - The sub expression.

Method Detail

asElement

public Element asElement()

Converts the object into an Element.

Overridden to return the sub expressions as an element:

 
 "$op" : expression
 
 

Specified by:

asElement in interface ElementAssignable

Returns:

The object as an Element.

toElement

public DocumentElement toElement(String name)

Returns the expression in the form of a BSON element.

Overridden to return the sub expressions as a document with a nested array element:

 
 { <name> : { "$op" : expression } }
 
 

Specified by:

toElement in interface Expression

Parameters:

name - The name for the expression's element.

Returns:

The expression in the form of a BSON element.

toString

public String toString()

Overridden to return the expression in JSON format.

 
 "$op" : expression
 
 

Overrides:

toString in class Object