HistoryDecorator.java

package org.foo.shell;

import java.io.PrintStream;
import java.util.*;
import org.osgi.framework.*;

public class HistoryDecorator implements Command, History, FrameworkListener, BundleListener {
  private final List<String> m_history = Collections.synchronizedList(new ArrayList<String>());
  private final Command m_next;

  public HistoryDecorator(Command next, List<String> history) {
    m_next = next;
    m_history.addAll(history);
  }

  public void exec(String args, PrintStream out, PrintStream err) throws Exception {
    try {
      m_next.exec(args, out, err);
    } finally {
      m_history.add(args);
    }
  }

  public List<String> get() {
    return new ArrayList<String>(m_history);
  }

  public void frameworkEvent(FrameworkEvent event) {
    m_history.add("\tFrameworkEvent(type=" + event.getType() + ",bundle=" + event.getBundle() + ",source=" +
      event.getSource() + ",throwable=" + event.getThrowable() + ")");
  }

  public void bundleChanged(BundleEvent event) {
    m_history.add("\tBundleEvent(type=" + event.getType() + ",bundle=" + event.getBundle() + ",source=" +
      event.getSource() + ")");
  }
}