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BeanShell is a small, free, embeddable Java source interpreter with object scripting language features,
written in Java. BeanShell dynamically executes standard Java syntax and extends it with common scripting
conveniences such as loose types, commands, and method closures like those in Perl and JavaScript.
The newest version!
/*****************************************************************************
* *
* This file is part of the BeanShell Java Scripting distribution. *
* Documentation and updates may be found at http://www.beanshell.org/ *
* *
* Sun Public License Notice: *
* *
* The contents of this file are subject to the Sun Public License Version *
* 1.0 (the "License"); you may not use this file except in compliance with *
* the License. A copy of the License is available at http://www.sun.com *
* *
* The Original Code is BeanShell. The Initial Developer of the Original *
* Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
* (C) 2000. All Rights Reserved. *
* *
* GNU Public License Notice: *
* *
* Alternatively, the contents of this file may be used under the terms of *
* the GNU Lesser General Public License (the "LGPL"), in which case the *
* provisions of LGPL are applicable instead of those above. If you wish to *
* allow use of your version of this file only under the terms of the LGPL *
* and not to allow others to use your version of this file under the SPL, *
* indicate your decision by deleting the provisions above and replace *
* them with the notice and other provisions required by the LGPL. If you *
* do not delete the provisions above, a recipient may use your version of *
* this file under either the SPL or the LGPL. *
* *
* Patrick Niemeyer ([email protected]) *
* Author of Learning Java, O'Reilly & Associates *
* http://www.pat.net/~pat/ *
* *
*****************************************************************************/
package bsh;
import java.lang.reflect.*;
import java.io.*;
import java.util.Vector;
/**
All of the reflection API code lies here. It is in the form
of static utilities. Maybe this belongs in LHS.java or a generic object
wrapper class.
*/
/*
Note: This class is messy. The method and field resolution need to be
rewritten. Various methods in here catch NoSuchMethod or NoSuchField
exceptions during their searches. These should be rewritten to avoid
having to catch the exceptions. Method lookups are now cached at a high
level so they are less important, however the logic is messy.
*/
class Reflect
{
/**
Invoke method on arbitrary object.
invocation may be static (through the object instance) or dynamic.
Object may be a bsh scripted object (This type).
*/
public static Object invokeObjectMethod(
Object object, String methodName, Object[] args,
Interpreter interpreter, CallStack callstack, SimpleNode callerInfo )
throws ReflectError, EvalError, InvocationTargetException
{
// Bsh scripted object
if ( object instanceof This && !This.isExposedThisMethod( methodName) )
return ((This)object).invokeMethod(
methodName, args, interpreter, callstack, callerInfo,
false/*delcaredOnly*/ );
else
// Java object
{
// find the java method
try {
BshClassManager bcm =
interpreter == null ? null : interpreter.getClassManager();
Class clas = object.getClass();
Method method = resolveExpectedJavaMethod(
bcm, clas, object, methodName, args, false );
return invokeOnMethod( method, object, args );
} catch ( UtilEvalError e ) {
throw e.toEvalError( callerInfo, callstack );
}
}
}
/**
Invoke a method known to be static.
No object instance is needed and there is no possibility of the
method being a bsh scripted method.
*/
public static Object invokeStaticMethod(
BshClassManager bcm, Class clas, String methodName, Object [] args )
throws ReflectError, UtilEvalError, InvocationTargetException
{
Interpreter.debug("invoke static Method");
Method method = resolveExpectedJavaMethod(
bcm, clas, null, methodName, args, true );
return invokeOnMethod( method, null, args );
}
/**
Invoke the Java method on the specified object.
@param args may be null
*/
static Object invokeOnMethod(
Method method, Object object, Object[] args )
throws ReflectError, InvocationTargetException
{
if ( args == null )
args = new Object[0];
if ( Interpreter.DEBUG )
{
Interpreter.debug("Invoking method (entry): "
+method+" with args:" );
for(int i=0; i