Package scriptella.driver.script

Class NashornBindingsParametersCallback

java.lang.Object

scriptella.driver.script.ParametersCallbackMap

scriptella.driver.script.BindingsParametersCallback

scriptella.driver.script.NashornBindingsParametersCallback

All Implemented Interfaces:

Map<String,Object>, Bindings, ParametersCallback

public class NashornBindingsParametersCallback
extends BindingsParametersCallback

Implementation of Bindings for Java 8 JavaScript engine "Nashorn".

See Nashorn engine notes for reasoning. In essence, Nashorn expects Bindings to be an instance of jdk.nashorn.api.scripting.ScriptObjectMirror, otherwise it puts "nashorn.global" variable inside and use it to store all variables. This makes the interface pretty unusable and requires some tricks implemented below

TODO: Fix issue with outer scripts variables not being visible to Nashorn. https://github.com/scriptella/scriptella-etl/issues/2

Author:

Fyodor Kupolov

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
NashornBindingsParametersCallback(ParametersCallback parentParameters)
NashornBindingsParametersCallback(ParametersCallback parentParameters, QueryCallback queryCallback)

Method Summary

Modifier and Type	Method	Description
Object	getParameter(String name)	Returns specified variable value.
Object	put(String key, Object value)	Sets local variable.

Methods inherited from class scriptella.driver.script.ParametersCallbackMap

clear, containsKey, containsValue, entrySet, get, isEmpty, isNextCalled, keySet, next, putAll, remove, setQueryCallback, size, values

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.script.Bindings

containsKey, get, putAll, remove

Methods inherited from interface java.util.Map

clear, compute, computeIfAbsent, computeIfPresent, containsValue, entrySet, equals, forEach, getOrDefault, hashCode, isEmpty, keySet, merge, putIfAbsent, remove, replace, replace, replaceAll, size, values

Constructor Details

NashornBindingsParametersCallback

public NashornBindingsParametersCallback(ParametersCallback parentParameters)

NashornBindingsParametersCallback

public NashornBindingsParametersCallback(ParametersCallback parentParameters,
 QueryCallback queryCallback)

Method Details

getParameter

public Object getParameter(String name)

Description copied from class: ParametersCallbackMap

Returns specified variable value.

The local variables set by ParametersCallbackMap.put(String,Object) method take priority of variables in parentParameters object.

Specified by:

getParameter in interface ParametersCallback

Overrides:

getParameter in class ParametersCallbackMap

Parameters:

name - variable name

Returns:

value of variable or null if variable not found.

put

public Object put(String key,
 Object value)

Description copied from class: ParametersCallbackMap

Sets local variable.

Specified by:

put in interface Bindings

Specified by:

put in interface Map<String,Object>

Overrides:

put in class ParametersCallbackMap

Parameters:

key - variable name.

value - variable value.

Returns:

previous variable value.