org.eclipse.viatra.transformation.evm.api

Class Context

java.lang.Object

org.eclipse.viatra.transformation.evm.api.Context

public class Context
extends java.lang.Object

A context is an associative store that is accessible during the execution of the EVM, and thus usable by the Sceduler, Executor, RuleBase, Rule Instances, Activations and Jobs. In order to separate different users from each other, values can be accessed (get/put/remove) with a key.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Context()

Method Summary

Modifier and Type	Method and Description
protected void	clear() Clears all data from the context.
static Context	create() Static helper method to create an empty Context.
java.lang.Object	get(java.lang.String key) Returns the value corresponding to the given key.
java.lang.Object	put(java.lang.String key, java.lang.Object value) Puts the value into the context with the given key
java.lang.Object	remove(java.lang.String key) Removes any existing value for the given key from the context.

Methods inherited from class java.lang.Object

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

Constructor Detail

Context

protected Context()

Method Detail

create

public static Context create()

Static helper method to create an empty Context.

get

public java.lang.Object get(java.lang.String key)

Returns the value corresponding to the given key.

Parameters:

key -

Returns:

the value in the context for the key

put

public java.lang.Object put(java.lang.String key,
                            java.lang.Object value)

Puts the value into the context with the given key

Parameters:

key -

value -

Returns:

the previous value for the key, or null

remove

public java.lang.Object remove(java.lang.String key)

Removes any existing value for the given key from the context.

Parameters:

key -

Returns:

the value if exists, null otherwise

clear

protected void clear()

Clears all data from the context.