/*
 * Copyright 2011 by Graz University of Technology, Austria
 * MOCCA has been developed by the E-Government Innovation Center EGIZ, a joint
 * initiative of the Federal Chancellery Austria and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */


package at.gv.egiz.bku.binding;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.gv.egiz.bku.accesscontroller.SecurityManagerFacade;
import at.gv.egiz.bku.jmx.ComponentMXBean;
import at.gv.egiz.bku.jmx.ComponentState;
import at.gv.egiz.bku.slcommands.SLCommand;
import at.gv.egiz.bku.slcommands.SLCommandContext;
import at.gv.egiz.bku.slcommands.SLCommandInvoker;
import at.gv.egiz.bku.slcommands.SLResult;
import at.gv.egiz.bku.slcommands.SLSourceContext;
import at.gv.egiz.bku.slcommands.SLTargetContext;
import at.gv.egiz.bku.slexceptions.SLException;

/**
 * This class implements the entry point for the CCEs security management.
 * 
 */
public class SLCommandInvokerImpl implements SLCommandInvoker, ComponentMXBean {

	private final Logger log = LoggerFactory.getLogger(SLCommandInvokerImpl.class);

	protected SLCommandContext commandContext;
	protected SLCommand command;
	protected SLResult result;
	protected SecurityManagerFacade securityManager;

	/**
	 * Invokes a sl command.
	 * 
	 * @throws SLException
	 */
	public void invoke(SLSourceContext aContext) throws SLException {
		if (securityManager == null) {
			log.warn("Security policy not implemented yet, invoking command: {}.", command);
			result = command.execute(commandContext);
		} else {
			if (securityManager.mayInvokeCommand(command, aContext)) {
				result = command.execute(commandContext);
			} else {
				throw new SLException(6002);
			}
		}
	}

	public SLResult getResult(SLTargetContext aContext) throws SLException {
		if (securityManager == null) {
			log.warn("Security policy not implemented yet, getting result of command: {}.", command);
			return result;
		} else {
			if (securityManager.maySendResult(command, aContext)) {
				return result;
			} else {
				throw new SLException(6002);
			}
		}
	}

	public void setCommand(SLCommandContext commandContext, SLCommand aCmd) {
	  this.commandContext = commandContext;
		command = aCmd;
	}

	@Override
	public SLCommandInvoker newInstance() {
		SLCommandInvokerImpl cmdInv = new SLCommandInvokerImpl();
		cmdInv.setSecurityManager(securityManager);
		return cmdInv;
	}

	public SecurityManagerFacade getSecurityManager() {
		return securityManager;
	}

	public void setSecurityManager(SecurityManagerFacade securityManager) {
		this.securityManager = securityManager;
	}

  @Override
  public ComponentState checkComponentState() {
    return new ComponentState(true);
  }

}