JSRScriptEngineAdapter (Web-Harvest Core 2.1.0 API)

java.lang.Object
- org.webharvest.runtime.scripting.jsr.JSRScriptEngineAdapter

All Implemented Interfaces:

ScriptEngine
```
public final class JSRScriptEngineAdapter
extends Object
implements ScriptEngine
```
Adapter design pattern implementation. Adapts provided ScriptEngine representing JSR-223 script engine to the ScriptEngine interface. This adapter is universal for all scripting language implementations supporting JSR-223 specification.
It is important to bear in mind that this implementation is not thread-safe, that is, ScriptEngine being adapted can not be shared between multiple threads. Bindings from scraper's DynamicScopeContext are copied directly to the ScriptEngine. This is performance trade-off, since currently creation of brand new ScriptContext instances each time script is evaluated is quite expensive.

Since:

2.1.0-SNAPSHOT

Version:

%I%, %G%

Author:

Piotr Dyraga

See Also:

ScriptEngine

Constructor Summary

Constructors
Constructor Description

JSRScriptEngineAdapter(ScriptEngine adaptee)
JSRScriptEngineAdapter constructor accepting reference to the not-null ScriptEngine delegate.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`evaluate(DynamicScopeContext context, ScriptSource script)`	Executes script provided in `ScriptSource`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - JSRScriptEngineAdapter
```
public JSRScriptEngineAdapter(ScriptEngine adaptee)
```
    JSRScriptEngineAdapter constructor accepting reference to the not-null ScriptEngine delegate.
    
    Parameters:
    
    adaptee - adaptee reference; mandatory, must not be null
- Method Detail
  - evaluate
```
public Object evaluate(DynamicScopeContext context,
                       ScriptSource script)
```
    Executes script provided in ScriptSource. Additionally, all variables defined in DynamicScopeContext are copied to the script engine context, so that they are accessible within the script.
    
    Specified by:
    
    evaluate in interface ScriptEngine
    
    Parameters:
    
    context - not null reference to the current DynamicScopeContext
    
    script - not null ScriptSource representing script which is going to be executed
    
    Returns:
    
    result of the script execution