package org.argeo.cms.spring.osgi;
   
   import org.apache.commons.logging.Log;
   import org.apache.commons.logging.LogFactory;
   import org.osgi.framework.Bundle;
   import org.osgi.framework.BundleContext;
   import org.osgi.framework.Constants;
   
   /**
   * Logs the name and version of an OSGi bundle based on its
   * {@link BundleContext}.
   */
  public class OsgiModuleLabel {
  	private final static Log log = LogFactory.getLog(OsgiModuleLabel.class);
  
  	private Bundle bundle;
  
  	public OsgiModuleLabel() {
  	}
  
  	/** Sets without logging. */
  	public OsgiModuleLabel(Bundle bundle) {
  		this.bundle = bundle;
  	}
  
  	/**
  	 * Retrieved bundle from a bundle context and logs it. Typically to be set
  	 * as a Spring bean.
  	 */
  	public void setBundleContext(BundleContext bundleContext) {
  		this.bundle = bundleContext.getBundle();
  		log.info(msg());
  	}
  
  	public String msg() {
  		String name = bundle.getHeaders().get(Constants.BUNDLE_NAME).toString();
  		String symbolicName = bundle.getSymbolicName();
  		String version = bundle.getVersion().toString();
  		return name + " v" + version + " (" + symbolicName + ")";
  	}
  }