text: /**
   * This file is part of Erjang - A JVM-based Erlang VM
   *
   * Copyright (c) 2010 by Trifork
   *
   * 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 erjang.util;
  
  import java.io.IOException;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import erjang.ERT;
  
  public class Progress {
  	static ProgressListener listener;
  
  	public static void setListener(ProgressListener listener) {
  		Progress.listener = listener;
  	}
  	
  	static AtomicInteger step = new AtomicInteger();
  
  	static byte[][] wheel = new byte[][] { new byte[] { '|', '\b' },
  			new byte[] { '/', '\b' }, new byte[] { '-', '\b' },
  			new byte[] { '\\', '\b' }, };
  
  	static public void activity(String string) {
  		if (listener != null) {
  			listener.progress(string);
  		} else {
  			int next = step.incrementAndGet();
  			try {
                  //there is a global System.property to suppress the output
                  String suppress = System.getProperty("erjang.progress.suppress");
                  if (suppress == null) {
                      suppress = "false";
                  }
  
                  if (!Boolean.parseBoolean(suppress)) {
                  	ERT.getErrorStream().write(wheel[next % 4]);
                  }
  			} catch (IOException e) {
  				// ignore
  			}
  		}
  	}
  
  	public static void done() {
  	}
  
  }
  