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package org.jvnet.hk2.config.provider.internal;

import java.security.AccessControlContext;
import java.security.AccessController;

/**
 * @author jwells
 *
 */
public class ConfigThreadContext {
    private static final ThreadLocal tlc = new ThreadLocal();

    private AccessControlContext acc;
    
    /**
     * Performs a runnable action while managing the callers AccessControlContext in thread local storage
     */
    public static void captureACCandRun(Runnable runnable) {
      ConfigThreadContext ts = tlc.get();
      if (null != ts && null != ts.acc) {
        // caller's original context already set
        runnable.run();
        return;
      }
      
      boolean created = (null == ts);
      if (created) {
        ts = new ConfigThreadContext();
        tlc.set(ts);
      }
      
      ts.acc = AccessController.getContext();
      
      try {
        runnable.run();
      } finally {
        ts.acc = null;
        if (created) {
          tlc.set(null);
        }
      }
    }
}