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## javax.script
Class AbstractScriptEngine

    java.lang.Object
      javax.script.AbstractScriptEngine

All Implemented Interfaces:
  ScriptEngine

Direct Known Subclasses:
  PhpScriptEngine

    public abstract class AbstractScriptEngine

extends java.lang.Object
implements ScriptEngine

GenericScriptEngine is an abstarct class which implements the ScriptEngine interface and it contains default implementations for several eval() methods.

Author:
  Nandika Jayawardana , Sanka Samaranayake

Field Summary

Fields inherited from interface javax.script.ScriptEngine
`ARGV, ENGINE, ENGINE_VERSION, FILENAME, LANGUAGE, LANGUAGE_VERSION, NAME`

Constructor Summary
`AbstractScriptEngine()` Constructs a ScriptEngine using an uninitialized SimpleNamespace.
`AbstractScriptEngine(Bindings namespace)` Constructs a ScriptEngine using the specified namespace as its ENGINE_SCOPE.

Method Summary
`java.lang.Object` | `eval(java.io.Reader reader)` Evaluates a piece of script obtained using the specified reader as the script source.
`java.lang.Object` | `eval(java.io.Reader reader, Bindings nameSpace)` Evaluates a piece of scripts obtained using a reader as the script source and using the specified namespace as the SCRIPT_SCOPE.
`java.lang.Object` | `eval(java.lang.String script)` Evaluates a piece of script and returns the resultant object.
`java.lang.Object` | `eval(java.lang.String script, Bindings nameSpace)` Evaluates a piece of script using the specified namespace as its SCRIPT_SCOPE.
`java.lang.Object` | `get(java.lang.String key)` Retrieves the associated value with the specified key ScriptEngine namespace.
`Bindings` | `getBindings(int scope)` Retrieves a reference to the associated namespace for the specified level of scope.
`ScriptContext` | `getContext()` Return the script context.
`void` | `put(java.lang.String key, java.lang.Object value)` Associates a key and a value in the ScriptEngine namespace.
`void` | `setBindings(Bindings namespace, int scope)` Associates a namespace with a specified level of scope.
`void` | `setContext(ScriptContext ctx)` Set a new context.

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

Methods inherited from interface javax.script.ScriptEngine
`createBindings, eval, eval, getFactory`

Constructor Detail

### AbstractScriptEngine

    public AbstractScriptEngine()

  Constructs a ScriptEngine using an uninitialized SimpleNamespace.

### AbstractScriptEngine

    public AbstractScriptEngine(Bindings namespace)

  Constructs a ScriptEngine using the specified namespace as its ENGINE_SCOPE.

  Parameters:
    `namespace` - the namespace to be used as the ENGINE_SCOPE

Method Detail

### setContext

    public void setContext(ScriptContext ctx)

  Set a new context.

  Specified by:
    `setContext` in interface `ScriptEngine`
  Parameters:
    `ctx` - The context

### getContext

    public ScriptContext getContext()

  Return the script context.

  Specified by:
    `getContext` in interface `ScriptEngine`
  Returns:
    The script context.

### eval

    public java.lang.Object eval(java.io.Reader reader)
                          throws ScriptException

  Evaluates a piece of script obtained using the specified reader as the script source. Returns null for non-returning scripts.

  Specified by:
    `eval` in interface `ScriptEngine`
  Parameters:
    `reader` - the reader form which the script is obtained
  Returns:
    the value of the evaluated script
  Throws:
    `ScriptException` - if an error occurs

### eval

    public java.lang.Object eval(java.io.Reader reader,
                                 Bindings nameSpace)
                          throws ScriptException

  Evaluates a piece of scripts obtained using a reader as the script source and using the specified namespace as the SCRIPT_SCOPE. Returns null for non-returning scripts.

  Specified by:
    `eval` in interface `ScriptEngine`
  Parameters:
    `reader` - the reader from which the script is obtained
    `nameSpace` - the namespace to be used as SCRIPT_SCOPE
  Returns:
    the value of the evaluated script
  Throws:
    `ScriptException` - if an error occurs

### eval

    public java.lang.Object eval(java.lang.String script)
                          throws ScriptException

  Evaluates a piece of script and returns the resultant object. Returns null for non-returning scripts.

  Specified by:
    `eval` in interface `ScriptEngine`
  Parameters:
    `script` - the String representation of the script
  Returns:
    the value of the evaluated script
  Throws:
    `ScriptException` - if an error occurs

### eval

    public java.lang.Object eval(java.lang.String script,
                                 Bindings nameSpace)
                          throws ScriptException

  Evaluates a piece of script using the specified namespace as its SCRIPT_SCOPE. Returns null for non-returning scripts.

  Specified by:
    `eval` in interface `ScriptEngine`
  Parameters:
    `script` - the String representation of the script
    `nameSpace` - the namespace to be used as the SCRIPT_SCOPE
  Returns:
    the value of the evaluated script
  Throws:
    `ScriptException` - if an error occurs

### get

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

  Retrieves the associated value with the specified key ScriptEngine namespace. Returns null if no such value exists.

  Specified by:
    `get` in interface `ScriptEngine`
  Parameters:
    `key` - the associated key of the value
  Returns:
    the value associated with the specified key in ScriptEngine namespace

### getBindings

    public Bindings getBindings(int scope)

  Retrieves a reference to the associated namespace for the specified level of scope.

  Specified by:
    `getBindings` in interface `ScriptEngine`
  Parameters:
    `scope` - the specified level of scope
  Returns:
    associated namespace for the specified level of scope
  Throws:
    `java.lang.IllegalArgumentException` - if the scope is invalid

### put

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

  Associates a key and a value in the ScriptEngine namespace.

  Specified by:
    `put` in interface `ScriptEngine`
  Parameters:
    `key` - String value which uniquely identifies the value
    `value` - value which is to be associated with the specified key
  Throws:
    `java.lang.IllegalArgumentException` - if the key is null

### setBindings

    public void setBindings(Bindings namespace,
                            int scope)
                     throws java.lang.UnsupportedOperationException

  Associates a namespace with a specified level of scope.

  Specified by:
    `setBindings` in interface `ScriptEngine`
  Parameters:
    `namespace` - the namespace to be associated with specified scope
    `scope` - the level of scope of the specified namespace
  Throws:
    `java.lang.IllegalArgumentException` - if scope is invalid
    `java.lang.UnsupportedOperationException`

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