org.elasticsearch.painless.node

Class ELambda

java.lang.Object

org.elasticsearch.painless.node.ANode

org.elasticsearch.painless.node.AExpression

org.elasticsearch.painless.node.ELambda

public final class ELambda
extends AExpression

Lambda expression node.

This can currently only be the direct argument of a call (method/constructor). When the argument is of a known type, it uses Java's lambda translation. However, if its a def call, then we don't have enough information, and have to defer this until link time. In that case a placeholder and all captures are pushed onto the stack and folded into the signature of the parent call.

For example:
def list = new ArrayList(); int capture = 0; list.sort((x,y) -> x - y + capture)
is converted into a call (pseudocode) such as:
sort(list, lambda$0, capture)
At link time, when we know the interface type, this is decomposed with MethodHandle combinators back into (pseudocode):
sort(list, lambda$0(capture))

Constructor Summary

Constructors

Constructor and Description
ELambda(java.lang.String name, SFunction.FunctionReserved reserved, Location location, java.util.List<java.lang.String> paramTypes, java.util.List<java.lang.String> paramNames, java.util.List<AStatement> statements)

Method Summary

Modifier and Type	Method and Description
default int	getCaptureCount() Returns the number of captured parameters
org.objectweb.asm.Type[]	getCaptures() Returns the types of captured parameters.
java.lang.String	getPointer() Returns reference to resolve at link-time
java.lang.String	toString() Subclasses should implement this with a method like ANode.singleLineToString(Object...) or ANode.multilineToString(Collection, Collection).

Methods inherited from class org.elasticsearch.painless.node.ANode

joinWithName, multilineToString, pairwiseToString, singleLineToString, singleLineToString, singleLineToStringWithOptionalArgs

Methods inherited from class java.lang.Object

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

Constructor Detail

ELambda

public ELambda(java.lang.String name,
               SFunction.FunctionReserved reserved,
               Location location,
               java.util.List<java.lang.String> paramTypes,
               java.util.List<java.lang.String> paramNames,
               java.util.List<AStatement> statements)

Method Detail

getPointer

public java.lang.String getPointer()

Returns reference to resolve at link-time

getCaptures

public org.objectweb.asm.Type[] getCaptures()

Returns the types of captured parameters. Can be empty

toString

public java.lang.String toString()

Description copied from class: ANode

Subclasses should implement this with a method like ANode.singleLineToString(Object...) or ANode.multilineToString(Collection, Collection).

Specified by:

toString in class ANode

getCaptureCount

public int getCaptureCount()

Returns the number of captured parameters