jsint
Class JavaMethod

java.lang.Object
  |
  +--jsint.Procedure
        |
        +--jsint.Reflector
              |
              +--jsint.JavaMethod

All Implemented Interfaces:

java.lang.Runnable, SchemeProcedure, java.io.Serializable

public class JavaMethod

extends Reflector

This class allows you to call any Java method, just by naming it, and doing the dispatch at runtime.

Author:

Peter Norvig, Copyright 1998, peter@norvig.com, license subsequently modified by Jscheme project members licensed under zlib licence (see license.txt)

See Also:

Serialized Form

Field Summary

static java.lang.Object[]

ZERO_ARGS

Fields inherited from class jsint.Reflector

canAccessPrivateData, reflectors

Fields inherited from class jsint.Procedure

maxArgs, minArgs, name

Constructor Summary

JavaMethod(java.lang.String name, java.lang.Class c)

JavaMethod(java.lang.String name, java.lang.Class c, boolean isStatic)

JavaMethod(java.lang.String name, java.lang.Class c, boolean isStatic, boolean canAccessPrivateData)
If the method is static then Class c is not null.

Method Summary

java.lang.Object	apply(java.lang.Object[] args) For a static method, args is an Object[] of arguments.
boolean	isStatic()
java.lang.Object[]	makeArgArray(java.lang.Object[] code, LexicalEnvironment lexenv) Take the code that represents a call, evaluate arguments in the calling lexical environment and put results into an argument array.
java.lang.Object[]	makeArgArray(Pair args)
protected void	reset() Reset your classpath dependent state.

Methods inherited from class jsint.Reflector

readResolve, resetAll

Methods inherited from class jsint.Procedure

apply, apply, catching, getName, nParms, run, setName, synchronize, throwObject, throwRuntimeException, toString, toStringArgs, tryCatch, tryFinally

Methods inherited from class java.lang.Object

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

Field Detail

ZERO_ARGS

public static final java.lang.Object[] ZERO_ARGS

Constructor Detail

JavaMethod

public JavaMethod(java.lang.String name,
                  java.lang.Class c,
                  boolean isStatic,
                  boolean canAccessPrivateData)

If the method is static then Class c is not null. For instance methods, if Class c is not null, then it is used at construction time to create a method table. Otherwise, the class of the method is determined at call time from the target, and the method table is constructed then and cached. Examples (see Symbol.java):

new JavaMethod("getProperties", System.class, true) - static method
new JavaMethod("put", Hashtable.class,false)        - specific instance method.
new JavaMethod("put", null, false)                  - unspecified instance method

JavaMethod

public JavaMethod(java.lang.String name,
                  java.lang.Class c,
                  boolean isStatic)

JavaMethod

public JavaMethod(java.lang.String name,
                  java.lang.Class c)

Method Detail

isStatic

public boolean isStatic()

reset

protected void reset()

Description copied from class: Reflector

Reset your classpath dependent state. This method can't be abstract.

Overrides:

reset in class Reflector

apply

public java.lang.Object apply(java.lang.Object[] args)

For a static method, args is an Object[] of arguments. For an instance method, args is (vector target (vector arguments));

Overrides:

apply in class Procedure

makeArgArray

public java.lang.Object[] makeArgArray(java.lang.Object[] code,
                                       LexicalEnvironment lexenv)

Description copied from class: Procedure

Take the code that represents a call, evaluate arguments in the calling lexical environment and put results into an argument array. Note that code[0] is the procedure, not an argument. For example, (p 1 2 3 (+ 2 2)) turns into the code {p, 1, 2, 3, {+, 2, 2}}, and if p has the parameter list (x y . z) then p.makeArgArray(code, lexenv) would return {1, 2, (3 4)}.

Overrides:

makeArgArray in class Procedure

makeArgArray

public java.lang.Object[] makeArgArray(Pair args)

Overrides:

makeArgArray in class Procedure