/**
    * Copyright 2010-2012 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.common.util;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class ModeUtils {
  
  	private static final Logger logger = LoggerFactory.getLogger(ModeUtils.class);
  
  	public static final void validate(Mode mode, String msg) {
  		validate(mode, msg, msg);
  	}
  
  	public static final void validate(Mode mode, String msg, String errMsg) {
  		validate(mode, msg, null, errMsg);
  	}
  
  	public static final void validate(Mode mode, String msg, Object arg, String errMsg) {
  		validate(mode, msg, arg, null, errMsg);
  	}
  
  	public static final void validate(Mode mode, String msg, Object arg1, Object arg2, String errMsg) {
  		validate(mode, msg, getArgs(arg1, arg2), errMsg);
  	}
  
  	public static final void validate(Mode mode, String msg, Object[] args, String errMsg) {
  		switch (mode) {
  		case IGNORE:
  			return;
  		case DEBUG:
  			logger.debug(msg, args);
  			return;
  		case INFORM:
  			logger.info(msg, args);
  			return;
  		case WARN:
  			logger.warn(msg, args);
  			return;
  		case ERROR:
  			logger.error(msg, args);
  			throw new IllegalStateException(errMsg);
  		default:
  			throw new IllegalArgumentException("Mode '" + mode + "' is unknown");
  		}
  	}
  
  	protected static final Object[] getArgs(Object arg1, Object arg2) {
  		if (arg1 == null && arg2 == null) {
  			return null;
  		}
  		List<Object> args = new ArrayList<Object>();
  		if (arg1 != null) {
  			args.add(arg1);
  		}
  		if (arg2 != null) {
  			args.add(arg2);
  		}
  		return CollectionUtils.toArray(args);
  	}
  
  }