org.norther.tammi.core.scripter.lang
Interface Interpreter

All Known Implementing Classes:

AbstractInterpreter, DJavaEngine, EngineInterpreter, GroovyEngine, GroovyInterpreter

public interface Interpreter

An interface to language interpreters.

Version:

$Id: Interpreter.java,v 1.11 2009/09/28 15:08:46 cvsimp Exp $

Author:

Ilkka Priha

Field Summary

static String

JAVA_LANGUAGE The java language.

Method Summary

void	addClassPath(String path) Adds a class search path.
void	addClassURL(URL url) Adds a class search URL.
Class<?>	defineClass(String name, byte[] code) Converts an array of bytes into a class.
void	defineVariable(String name, Object value) Defines a variable in the interpreter environment.
void	defineVariable(String name, Object value, Class<?> c) Defines a variable of the specified class.
ClassLoader	getClassLoader() Gets the class loader.
Set<String>	getClassNames() Gets the defined class names.
Object	getVariable(String name) Gets the value of a variable.
Class<?>	getVariableClass(String name) Gets the class of a variable.
Set<String>	getVariableNames() Gets the defined variable names.
Object	interpret(File file) Interprets a file.
Object	interpret(InputStream in, String fname) Interprets an input stream.
Object	interpret(Reader r, String fname) Interprets a reader.
Object	interpret(String s, String fname) Interprets a string.
Object	interpret(URL url) Interprets a URL.
boolean	isDefined(String name) Checks whether a variable is defined.
Class<?>	loadClass(String name) Loads an interpreted class.
void	reset() Resets this interpreter.
void	setVariable(String name, Object value) Sets the value of a variable.

Field Detail

JAVA_LANGUAGE

static final String JAVA_LANGUAGE

The java language.

See Also:

Constant Field Values

Method Detail

interpret

Object interpret(String s,
                 String fname)

Interprets a string.

Parameters:

s - the string from which the statements are read.

fname - the name of the parsed string.

Returns:

the result of the evaluation of the last statement.

Throws:

Error - if interpretation fails.

interpret

Object interpret(InputStream in,
                 String fname)

Interprets an input stream.

Parameters:

in - the input stream from which the statements are read.

fname - the name of the parsed stream.

Returns:

the result of the evaluation of the last statement.

Throws:

Error - if interpretation fails.

interpret

Object interpret(Reader r,
                 String fname)

Interprets a reader.

Parameters:

r - the reader.

fname - the name of the parsed stream.

Returns:

the result of the evaluation of the last statement.

Throws:

Error - if interpretation fails.

interpret

Object interpret(File file)
                 throws IOException

Interprets a file.

Parameters:

file - the file to interpret.

Returns:

the result of the evaluation of the last statement.

Throws:

Error - if interpretation fails.

IOException - on I/O errors.

interpret

Object interpret(URL url)
                 throws IOException

Interprets a URL.

Parameters:

url - the url to interpret.

Returns:

the result of the evaluation of the last statement.

Throws:

Error - if interpretation fails.

IOException - on I/O errors.

defineVariable

void defineVariable(String name,
                    Object value)

Defines a variable in the interpreter environment.

Parameters:

name - the variable's name.

value - the initial value of the variable.

Throws:

IllegalStateException - if name is already defined.

defineVariable

void defineVariable(String name,
                    Object value,
                    Class<?> c)

Defines a variable of the specified class.

Parameters:

name - the name.

value - the value.

c - the class.

isDefined

boolean isDefined(String name)

Checks whether a variable is defined.

Parameters:

name - the name.

Returns:

true if defined, false otherwise.

getVariable

Object getVariable(String name)

Gets the value of a variable.

Parameters:

name - the variable name.

Returns:

the variable value.

Throws:

IllegalStateException - if the variable does not exist.

setVariable

void setVariable(String name,
                 Object value)

Sets the value of a variable.

Parameters:

name - the variable name.

value - the value of the variable.

Throws:

IllegalStateException - if the assignment is invalid.

getVariableClass

Class<?> getVariableClass(String name)

Gets the class of a variable.

Parameters:

name - the variable name.

Returns:

the variable class.

Throws:

IllegalStateException - if the variable does not exist.

getVariableNames

Set<String> getVariableNames()

Gets the defined variable names.

Returns:

a set of strings.

addClassPath

void addClassPath(String path)

Adds a class search path.

Parameters:

path - the path to add.

addClassURL

void addClassURL(URL url)

Adds a class search URL.

Parameters:

url - the url to add.

loadClass

Class<?> loadClass(String name)
                   throws ClassNotFoundException

Loads an interpreted class.

Parameters:

name - the fully qualified name of the class to load.

Returns:

the loaded class.

Throws:

ClassNotFoundException - if the class cannot be find.

defineClass

Class<?> defineClass(String name,
                     byte[] code)

Converts an array of bytes into a class.

Parameters:

name - the fully qualified name of the class to load.

code - the byte code of the class.

Returns:

the defined class.

Throws:

ClassFormatError - if the class could not be defined.

getClassNames

Set<String> getClassNames()

Gets the defined class names.

Returns:

a set of strings.

getClassLoader

ClassLoader getClassLoader()

Gets the class loader.

Returns:

the class loader.

reset

void reset()

Resets this interpreter.