/jEdit/tags/jedit-4-3-pre5/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  *
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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.", 
			this, callstack );
	}

	/**
		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, callstack );
            	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, callstack );

			// unwrap primitive to the wrapper type
			Object value;
			if ( currentInitializer instanceof Primitive )
			{
				Primitive primValue = (Primitive)currentInitializer;
				/*
				TODO:
					to get cast and boxing working e.g.
					e.g. Byte [] ia = { 1, 2 }

					If the baseType is a wrapper type then we need to get the 
					primitive TYPE class for the base type here in order for 
					the cast to allow it... Then boxing will happen naturally in
					the Array.set().
					e.g. Integer [] ia = { 1, 2 }
				*/
				/*
				if ( Primitive.isWrapperType( baseType ) )
					baseType = Primitive.getPrimitiveTypeForType( baseType );
				*/

				// don't deal with object types here... unless above
				if ( baseType.isPrimitive() )
					try {
						primValue = primValue.castToType( 
							baseType, Types.CAST );
					} catch ( UtilEvalError e ) {
					e.printStackTrace();
						Interpreter.debug("error:"+e);
						throwTypeError( baseType, primValue, i, callstack );
					}

				value = primValue.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, callstack );
            } catch( ArrayStoreException e ) { // I think this can happen
				Interpreter.debug("arraystore"+e);
				throwTypeError( baseType, currentInitializer, i, callstack );
            }
        }

        return initializers;
    }

	private void throwTypeError( 
		Class baseType, Object initializer, int argNum, CallStack callstack ) 
		throws EvalError
	{
		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, callstack );
	}

}