org.osgi.framework.Filter#toString ( )源码实例Demo

/**
 * Create a {@code ServiceTracker} on the specified {@code Filter} object.
 * 
 * <p>
 * Services which match the specified {@code Filter} object will be tracked
 * by this {@code ServiceTracker}.
 * 
 * @param context The {@code BundleContext} against which the tracking is
 *        done.
 * @param filter The {@code Filter} to select the services to be tracked.
 * @param customizer The customizer object to call when services are added,
 *        modified, or removed in this {@code ServiceTracker}. If customizer
 *        is null, then this {@code ServiceTracker} will be used as the
 *        {@code ServiceTrackerCustomizer} and this {@code ServiceTracker}
 *        will call the {@code ServiceTrackerCustomizer} methods on itself.
 * @since 1.1
 */
public ServiceTracker(final BundleContext context, final Filter filter, final ServiceTrackerCustomizer<S, T> customizer) {
	this.context = context;
	this.trackReference = null;
	this.trackClass = null;
	this.listenerFilter = filter.toString();
	this.filter = filter;
	this.customizer = (customizer == null) ? this : customizer;
	if ((context == null) || (filter == null)) {
		/*
		 * we throw a NPE here to be consistent with the other constructors
		 */
		throw new NullPointerException();
	}
}
 

/**
 * Create a {@code ServiceTracker} on the specified {@code Filter} object.
 * 
 * <p>
 * Services which match the specified {@code Filter} object will be tracked
 * by this {@code ServiceTracker}.
 * 
 * @param context The {@code BundleContext} against which the tracking is
 *        done.
 * @param filter The {@code Filter} to select the services to be tracked.
 * @param customizer The customizer object to call when services are added,
 *        modified, or removed in this {@code ServiceTracker}. If customizer
 *        is null, then this {@code ServiceTracker} will be used as the
 *        {@code ServiceTrackerCustomizer} and this {@code ServiceTracker}
 *        will call the {@code ServiceTrackerCustomizer} methods on itself.
 * @since 1.1
 */
public ServiceTracker(final BundleContext context, final Filter filter, final ServiceTrackerCustomizer<S, T> customizer) {
	this.context = context;
	this.trackReference = null;
	this.trackClass = null;
	this.listenerFilter = filter.toString();
	this.filter = filter;
	this.customizer = (customizer == null) ? this : customizer;
	if ((context == null) || (filter == null)) {
		/*
		 * we throw a NPE here to be consistent with the other constructors
		 */
		throw new NullPointerException();
	}
}
 

/**
 * Package private constructor used by CoordinationPermissionCollection.
 * 
 * @param filter name filter
 * @param mask action mask
 */
CoordinationPermission(Filter filter, int mask) {
	super((filter == null) ? "*" : filter.toString());
	setTransients(filter, mask);
	this.bundle = null;
}
 

/**
 * Package private constructor used by SubsystemPermissionCollection.
 * 
 * @param filter name filter or {@code null} for wildcard.
 * @param mask action mask
 */
SubsystemPermission(Filter filter, int mask) {
	super((filter == null) ? "*" : filter.toString());
	setTransients(filter, mask);
	this.subsystem = null;
}