org.apache.flink.compiler.contextcheck

Class ContextChecker

java.lang.Object

org.apache.flink.compiler.contextcheck.ContextChecker

All Implemented Interfaces:

Visitor<Operator<?>>

public class ContextChecker
extends Object
implements Visitor<Operator<?>>

Traverses a plan and checks whether all Contracts are correctly connected to their input contracts.

Constructor Summary

Constructors

Constructor and Description
ContextChecker() Default constructor

Method Summary

Modifier and Type	Method and Description
void	check(Plan plan) Checks whether the given plan is valid.
void	postVisit(Operator<?> node)
boolean	preVisit(Operator<?> node) Checks whether the node is correctly connected to its input.

Methods inherited from class java.lang.Object

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

Constructor Detail

ContextChecker

public ContextChecker()

Default constructor

Method Detail

check

public void check(Plan plan)

Checks whether the given plan is valid. In particular it is checked that all contracts have the correct number of inputs and all inputs are of the expected type. In case of an invalid plan an extended RuntimeException is thrown.

Parameters:

plan - The plan to check.

preVisit

public boolean preVisit(Operator<?> node)

Checks whether the node is correctly connected to its input.

Specified by:

preVisit in interface Visitor<Operator<?>>

postVisit

public void postVisit(Operator<?> node)

Specified by:

postVisit in interface Visitor<Operator<?>>