visad.util
Class ReflectedUniverse

java.lang.Object
  visad.util.ReflectedUniverse

public class ReflectedUniverse
extends Object

A general-purpose reflection wrapper class. See visad.data.jai.JAIForm for examples of usage.

Field Summary

protected boolean	debug Debugging flag.
protected ClassLoader	loader Class loader for imported classes.
protected Hashtable	variables Hashtable containing all variables present in the universe.

Constructor Summary

ReflectedUniverse()
Constructs a new reflected universe.

ReflectedUniverse(ClassLoader loader)
Constructs a new reflected universe that uses the given class loader.

ReflectedUniverse(URL[] urls)
Constructs a new reflected universe, with the given URLs representing additional search paths for imported classes (in addition to the CLASSPATH).

Method Summary

Object	exec(String command) Executes a command in the universe.
Object	getVar(String varName) Returns the value of a variable or field in the universe.
boolean	isDebug() Gets whether extended debugging output is enabled.
static boolean	isInstance(Class c, Object o) Returns whether the given object is compatible with the specified class for the purposes of reflection.
void	setDebug(boolean debug) Enables or disables extended debugging output.
void	setVar(String varName, boolean b) Registers a variable of primitive type boolean in the universe.
void	setVar(String varName, byte b) Registers a variable of primitive type byte in the universe.
void	setVar(String varName, char c) Registers a variable of primitive type char in the universe.
void	setVar(String varName, double d) Registers a variable of primitive type double in the universe.
void	setVar(String varName, float f) Registers a variable of primitive type float in the universe.
void	setVar(String varName, int i) Registers a variable of primitive type int in the universe.
void	setVar(String varName, long l) Registers a variable of primitive type long in the universe.
void	setVar(String varName, Object obj) Registers a variable in the universe.
void	setVar(String varName, short s) Registers a variable of primitive type short in the universe.

Methods inherited from class java.lang.Object

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

Field Detail

variables

protected Hashtable variables

Hashtable containing all variables present in the universe.

loader

protected ClassLoader loader

Class loader for imported classes.

debug

protected boolean debug

Debugging flag.

Constructor Detail

ReflectedUniverse

public ReflectedUniverse()

Constructs a new reflected universe.

ReflectedUniverse

public ReflectedUniverse(URL[] urls)

Constructs a new reflected universe, with the given URLs representing additional search paths for imported classes (in addition to the CLASSPATH).

ReflectedUniverse

public ReflectedUniverse(ClassLoader loader)

Constructs a new reflected universe that uses the given class loader.

Method Detail

isInstance

public static boolean isInstance(Class c,
                                 Object o)

Returns whether the given object is compatible with the specified class for the purposes of reflection.

exec

public Object exec(String command)
            throws VisADException

Executes a command in the universe. The following syntaxes are valid:

import fully.qualified.package.ClassName

var = new ClassName(param1, ..., paramN)

var.method(param1, ..., paramN)

var2 = var1.method(param1, ..., paramN)

ClassName.method(param1, ..., paramN)

Important guidelines:

Any referenced class must be imported first using "import".

Variables can be exported from the universe with getVar().

Variables can be imported to the universe with setVar().

Each parameter must be either a variable in the universe or a static or instance field (i.e., no nested methods).

Throws:

VisADException

setVar

public void setVar(String varName,
                   Object obj)

Registers a variable in the universe.

setVar

public void setVar(String varName,
                   boolean b)

Registers a variable of primitive type boolean in the universe.

setVar

public void setVar(String varName,
                   byte b)

Registers a variable of primitive type byte in the universe.

setVar

public void setVar(String varName,
                   char c)

Registers a variable of primitive type char in the universe.

setVar

public void setVar(String varName,
                   double d)

Registers a variable of primitive type double in the universe.

setVar

public void setVar(String varName,
                   float f)

Registers a variable of primitive type float in the universe.

setVar

public void setVar(String varName,
                   int i)

Registers a variable of primitive type int in the universe.

setVar

public void setVar(String varName,
                   long l)

Registers a variable of primitive type long in the universe.

setVar

public void setVar(String varName,
                   short s)

Registers a variable of primitive type short in the universe.

getVar

public Object getVar(String varName)
              throws VisADException

Returns the value of a variable or field in the universe. Primitive types will be wrapped in their Java Object wrapper classes.

Throws:

VisADException

setDebug

public void setDebug(boolean debug)

Enables or disables extended debugging output.

isDebug

public boolean isDebug()

Gets whether extended debugging output is enabled.