io.permazen.parse.expr

Class CastNode

java.lang.Object

io.permazen.parse.expr.CastNode

All Implemented Interfaces:

Node

public class CastNode
extends Object
implements Node

A parsed cast expression.

Includes an extension to support casting a String to any supported field type via FieldType.fromString(java.lang.String), for example (java.time.Duration)"PT24H".

Constructor Summary

Constructors

Constructor and Description
CastNode(ClassNode typeNode, Node target) Constructor.

Method Summary

Modifier and Type	Method and Description
Value	evaluate(ParseSession session) Evaluate this node.
Class<?>	getType(ParseSession session) Get the type of this node's value.

Methods inherited from class java.lang.Object

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

Constructor Detail

CastNode

public CastNode(ClassNode typeNode,
                Node target)

Constructor.

Parameters:

typeNode - cast type node

target - cast target

Method Detail

getType

public Class<?> getType(ParseSession session)

Description copied from interface: Node

Get the type of this node's value.

If the type is unknown, Object.class should be returned.

Specified by:

getType in interface Node

Parameters:

session - parse session

Returns:

the expected type of the node

evaluate

public Value evaluate(ParseSession session)

Description copied from interface: Node

Evaluate this node. There will be a transaction open.

Specified by:

evaluate in interface Node

Parameters:

session - parse session

Returns:

result of node evaluation