/*
 * JavaEventCmd.java --
 *
 *	Implements the built-in "java:event" Tcl command.
 *
 * Copyright (c) 1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and
 * redistribution of this file, and for a DISCLAIMER OF ALL
 * WARRANTIES.
 * 
 * RCS: @(#) $Id: JavaEventCmd.java,v 1.1.1.1 1998/10/14 21:09:14 cvsadmin Exp $
 *
 */

package tcl.lang;

/*
 * This class implements the built-in "java::event" command in Tcl.
 */

class JavaEventCmd implements Command {

/*
 * The Bean Event Manager associated with the interp that owns this
 * BindCmd instance.
 */

BeanEventMgr eventMgr = null;

/*
 * Valid command options.
 */

static final private String validOpts[] = {
    "-index",
};

static final int OPT_INDEX = 0;


/*
 *----------------------------------------------------------------------
 *
 * cmdProc --
 *
 *	This procedure is invoked as part of the Command interface to
 *	process the "java::event" Tcl command.  See the user
 *	documentation for details on what it does.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

public void
cmdProc(
    Interp interp,		// Current interpreter.
    TclObject argv[])		// Argument list.
throws 
    TclException 		// A standard Tcl exception.
{
    int index;
    TclObject propObj;

    if (argv.length > 4) {
	throw new TclNumArgsException(interp, 1, argv,
		"?-index num? ?propertyName?");
    }

    if (argv.length <= 2) {
	index = 0;	   
    } else {
	TclIndex.get(interp, argv[1], validOpts, "option", 0);

	/*
	 * Since we just have one valid option, if the above call returns
	 * without an exception, we've got "-index" (or abreviations).
	 */

	index = TclInteger.get(interp, argv[2]);
    }

    if (argv.length == 2) {
	propObj = argv[1];
    } else if (argv.length == 4) {
	propObj = argv[3];
    } else {
	propObj = null;
    }

    if (eventMgr == null) {
	eventMgr = BeanEventMgr.getBeanEventMgr(interp);
    }

    BeanEventParamSet p = eventMgr.peekEventParamSet();
    if (p == null) {
	throw new TclException(interp, "\"" + argv[0] +
		"\" cannot be invoked outside of an event handler");
    }

    if ((index < 0) || (index >= p.params.length)) {
	throw new TclException(interp, "event parameter #" + index +
		" doesn't exist");
    }

    TclObject param = JavaInvoke.convertJavaObject(interp,
	p.paramTypes[index], p.params[index]);

    if (propObj == null) {
	/*
	 * The property name is not specified, return the whole parameter.
	 */

	interp.setResult(param);
    } else {
	/*
	 * Return the given property of the parameter.
	 */

	interp.setResult(JavaInvoke.getProperty(interp, param, propObj, true));
    }
}

} // end JavaEventCmd