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package org.scijava.service;

import org.scijava.Context;
import org.scijava.plugin.AbstractRichPlugin;

/**
 * Abstract superclass of {@link Service} implementations.
 * 
 * @author Curtis Rueden
 */
public abstract class AbstractService extends AbstractRichPlugin implements
	Service
{

	/**
	 * A pointer to the service's {@link Context}. Note that for two reasons, the
	 * context is not set in the superclass:
	 * 
	 * As services are initialized, their dependencies are recursively created
	 * and initialized too, which is something that normal context injection does
	 * not handle. I.e., the {@link Context#inject(Object)} method assumes the
	 * context and its associated services have all been initialized already.
	 * Event handler methods must not be registered until after service
	 * initialization is complete (i.e., during {@link #registerEventHandlers()},
	 * after {@link #initialize()}).
	 * 
	 */
	private Context context;

	// -- Contextual methods --

	@Override
	public Context getContext() {
		return context;
	}

	@Override
	public void setContext(final Context context) {
		// NB: Do not call super.setContext(Context)!
		// The ServiceHelper populates service parameters.
		// We do this because we need to recursively create and initialize
		// service dependencies, rather than merely injecting existing ones.
		this.context = context;
	}

	// -- Object methods --

	@Override
	public String toString() {
		return getClass().getName() + " [priority = " + getPriority() + "]";
	}

}