bsfcommand.java

Bean Scripting Framework (BSF)为在java应用中使用脚本语言

/*
 * Copyright 2004,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.bsf.engines.jacl;

import org.apache.bsf.BSFEngine;
import org.apache.bsf.BSFException;
import org.apache.bsf.BSFManager;
import org.apache.bsf.util.EngineUtils;

import tcl.lang.Command;
import tcl.lang.Interp;
import tcl.lang.ReflectObject;
import tcl.lang.TCL;
import tcl.lang.TclException;
import tcl.lang.TclObject;

// class used to add "bsf" command to the Jacl runtime
class BSFCommand implements Command {
  BSFManager mgr;
  BSFEngine jengine;

  BSFCommand (BSFManager mgr, BSFEngine jengine) {
	this.mgr = mgr;
	this.jengine = jengine;
  }
  public void cmdProc (Interp interp, 
		       TclObject argv[]) throws TclException {
	if (argv.length < 2) {
	  interp.setResult ("invalid # of args; usage: bsf " +
		"lookupBean|registerBean|unregisterBean|addEventListener args");
	  throw new TclException (TCL.ERROR);
	}

	String op = argv[1].toString ();

	if (op.equals ("lookupBean")) {
	  if (argv.length != 3) {
	interp.setResult ("invalid # of args; usage: bsf " +
			  "lookupBean name-of-bean");
	throw new TclException (TCL.ERROR);
	  }

	  String beanName = argv[2].toString ();
	  Object bean = mgr.lookupBean (beanName);
	  if (bean == null) {
	interp.setResult ("unknown object: " + beanName);
	throw new TclException (TCL.ERROR);
	  }
	  interp.setResult (ReflectObject.newInstance (interp, bean.getClass (), 
						   bean));

	} else if (op.equals ("registerBean")) {
	  if (argv.length != 4) {
	interp.setResult ("invalid # of args; usage: bsf " +
			  "registerBean name-of-bean bean");
	throw new TclException (TCL.ERROR);
	  }
	  mgr.registerBean (argv[2].toString (), 
			ReflectObject.get (interp, argv[3]));
	  interp.setResult ("");

	} else if (op.equals ("unregisterBean")) {
	  if (argv.length != 3) {
	interp.setResult ("invalid # of args; usage: bsf " +
			  "unregisterBean name-of-bean");
	throw new TclException (TCL.ERROR);
	  }
	  mgr.unregisterBean (argv[2].toString ());
	  interp.setResult ("");

	} else if (op.equals ("addEventListener")) {
	  if (argv.length != 6) {
	interp.setResult ("invalid # of args; usage: bsf " +
			  "addEventListener object event-set-name filter " +
			  "script-to-run");
	throw new TclException (TCL.ERROR);
	  }
	  try {
	// usage: bsf addEventListener object event-set filter script
	String filter = argv[4].toString ();
	filter = filter.equals ("") ? null : filter;
	EngineUtils.addEventListener (ReflectObject.get (interp, argv[2]),
				      argv[3].toString (), filter,
				      jengine, mgr, "<event-script>", 0, 0,
				      argv[5].toString ());
	  } catch (BSFException e) {
	e.printStackTrace ();
	interp.setResult ("got BSF exception: " + e.getMessage ());
	throw new TclException (TCL.ERROR);
	  }
	}
  }
}