/jEdit/tags/jedit-4-0-pre3/bsh/BSHArrayInitializer.java

/*****************************************************************************
 *                                                                           *
 *  This file is part of the BeanShell Java Scripting distribution.          *
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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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 *                                                                           *
 *  Patrick Niemeyer (pat@pat.net)                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/


package bsh;

import java.lang.reflect.Array;

class BSHArrayInitializer extends SimpleNode
{
    BSHArrayInitializer(int id) { super(id); }

    public Object eval( CallStack callstack, Interpreter interpreter )
		throws EvalError 
	{
		throw new EvalError( "Array initializer has no base type.");
	}

	/**
		Construct the array from the initializer syntax.

		@param baseType the base class type of the array (no dimensionality)
		@param dimensions the top number of dimensions of the array 
			e.g. 2 for a String [][];
	*/
    public Object eval( Class baseType, int dimensions, 
						CallStack callstack, Interpreter interpreter ) 
		throws EvalError
    {
        int numInitializers = jjtGetNumChildren();

		// allocate the array to store the initializers
		int [] dima = new int [dimensions]; // description of the array
		// The other dimensions default to zero and are assigned when 
		// the values are set.
		dima[0] = numInitializers;
        Object initializers = 
			Array.newInstance( baseType, dima );

		// Evaluate the initializers
        for (int i = 0; i < numInitializers; i++)
        {
			SimpleNode node = (SimpleNode)jjtGetChild(i);
            Object currentInitializer;
			if ( node instanceof BSHArrayInitializer ) {
				if ( dimensions < 2 )
					throw new EvalError(
						"Invalid Location for Intializer, position: "+i, this);
            	currentInitializer = 
					((BSHArrayInitializer)node).eval( 
						baseType, dimensions-1, callstack, interpreter);
			} else
            	currentInitializer = node.eval( callstack, interpreter);

			if ( currentInitializer == Primitive.VOID )
				throw new EvalError(
					"Void in array initializer, position"+i, this);

			// unwrap primitive to the wrapper type
			Object value;
			if ( currentInitializer instanceof Primitive )
				value = ((Primitive)currentInitializer).getValue();
			else
				value = currentInitializer;

			// store the value in the array
            try {
				Array.set(initializers, i, value);

            } catch( IllegalArgumentException e ) {
				Interpreter.debug("illegal arg"+e);
				throwTypeError( baseType, currentInitializer, i );
            } catch( ArrayStoreException e ) { // I think this can happen
				Interpreter.debug("arraystore"+e);
				throwTypeError( baseType, currentInitializer, i );
            }
        }

        return initializers;
    }

	private void throwTypeError( 
		Class baseType, Object initializer, int argNum ) 
		throws EvalError
	{
		String lhsType = Reflect.normalizeClassName(baseType);

		String rhsType;
		if (initializer instanceof Primitive)
			rhsType = 
				((Primitive)initializer).getType().getName();
		else
			rhsType = Reflect.normalizeClassName(
				initializer.getClass());

		throw new EvalError ( "Incompatible type: " + rhsType 
			+" in initializer of array type: "+ baseType
			+" at position: "+argNum, this );
	}
}