com.redhat.lightblue.eval

Class Updater

java.lang.Object

com.redhat.lightblue.eval.Updater

Direct Known Subclasses:

ArrayAddExpressionEvaluator, ForEachExpressionEvaluator, SetExpressionEvaluator, UnsetExpressionEvaluator, UpdateExpressionListEvaluator

public abstract class Updater
extends Object

Base class for update expression evaluators.

Constructor Summary

Constructors

Constructor and Description
Updater()

Method Summary

Methods

Modifier and Type	Method and Description
static Updater	getInstance(com.fasterxml.jackson.databind.node.JsonNodeFactory factory, EntityMetadata md, UpdateExpression expr) Creates an updater object based on the given update expression
static Updater	getInstance(com.fasterxml.jackson.databind.node.JsonNodeFactory factory, FieldTreeNode context, UpdateExpression expr) Creates an updater object based on the given update expression
Set<Path>	getUpdateFields()
abstract void	getUpdateFields(Set<Path> fields) Add the fields updated by this updater to the set of fields.
abstract boolean	update(JsonDoc doc, FieldTreeNode contextMd, Path contextPath) The implementation should update the document

Methods inherited from class java.lang.Object

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

Constructor Detail

Updater

public Updater()

Method Detail

update

public abstract boolean update(JsonDoc doc,
             FieldTreeNode contextMd,
             Path contextPath)

The implementation should update the document

Parameters:

contextMd - The metadata for the current context

contextPath - Absolute path to current context

Returns:

true if document is updated, false if not

getUpdateFields

public abstract void getUpdateFields(Set<Path> fields)

Add the fields updated by this updater to the set of fields.

Parameters:

fields - A Set to receive the fields to be updated The fields list should be added the absolute paths

getUpdateFields

public Set<Path> getUpdateFields()

getInstance

public static Updater getInstance(com.fasterxml.jackson.databind.node.JsonNodeFactory factory,
                  EntityMetadata md,
                  UpdateExpression expr)

Creates an updater object based on the given update expression

getInstance

public static Updater getInstance(com.fasterxml.jackson.databind.node.JsonNodeFactory factory,
                  FieldTreeNode context,
                  UpdateExpression expr)

Creates an updater object based on the given update expression

Parameters:

factory - Node factory

context - Metadata for the context node

expr - The update expression.