BSHFormalParameters.java

/*****************************************************************************
 *                                                                           *
 *  This file is part of the BeanShell Java Scripting distribution.          *
 *  Documentation and updates may be found at http://www.beanshell.org/      *
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 *  Sun Public License Notice:                                               *
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 *  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 *
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 *                                                                           *
 *  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.                                          *
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 *  GNU Public License Notice:                                               *
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 *                                                                           *
 *  Patrick Niemeyer (pat@pat.net)                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/

package org.gjt.sp.jedit.bsh;

class BSHFormalParameters extends SimpleNode
{
	private String [] paramNames;
	/**
		For loose type parameters the paramTypes are null.
	*/
	// unsafe caching of types
	Class [] paramTypes;
	int numArgs;
	String [] typeDescriptors;

	BSHFormalParameters(int id) { super(id); }

	void insureParsed() 
	{
		if ( paramNames != null )
			return;

		this.numArgs = jjtGetNumChildren();
		String [] paramNames = new String[numArgs];

		for(int i=0; i<numArgs; i++)
		{
			BSHFormalParameter param = (BSHFormalParameter)jjtGetChild(i);
			paramNames[i] = param.name;
		}

		this.paramNames = paramNames;
	}

	public String [] getParamNames() { 
		insureParsed();
		return paramNames;
	}

	public String [] getTypeDescriptors( 
		CallStack callstack, Interpreter interpreter, String defaultPackage )
	{
		if ( typeDescriptors != null )
			return typeDescriptors;

		insureParsed();
		String [] typeDesc = new String[numArgs];

		for(int i=0; i<numArgs; i++)
		{
			BSHFormalParameter param = (BSHFormalParameter)jjtGetChild(i);
			typeDesc[i] = param.getTypeDescriptor( 
				callstack, interpreter, defaultPackage );
		}

		this.typeDescriptors = typeDesc;
		return typeDesc;
	}

	/**
		Evaluate the types.  
		Note that type resolution does not require the interpreter instance.
	*/
	public Object eval( CallStack callstack, Interpreter interpreter )  
		throws EvalError
	{
		if ( paramTypes != null )
			return paramTypes;

		insureParsed();
		Class [] paramTypes = new Class[numArgs];

		for(int i=0; i<numArgs; i++)
		{
			BSHFormalParameter param = (BSHFormalParameter)jjtGetChild(i);
			paramTypes[i] = (Class)param.eval( callstack, interpreter );
		}

		this.paramTypes = paramTypes;

		return paramTypes;
	}
}