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Jadex Rules is a small lightweight rule engine, which currently employs the well-known Rete algorithm for highly efficient rule matching. Jadex rules is therefore similar to other rule engines like JESS and Drools. Despite the similarities there are also important differences between these systems: * Jadex Rules is very small and intended to be used as component of other software. Even though rules can be specified in a Java dialect as well as (a small variation of) the CLIPS language its primary usage is on the API level. Jadex Rules is currently the core component of the Jadex BDI reasoning engine. * Jadex Rules cleanly separates between state and rule representation. This allows the state implementation as well as the matcher to be flexibly exchanged. Some experiments have e.g. been conducted with a Jena representation. Regarding the matcher, it is planned to support also the Treat algorithm, which has a lower memory footprint than Rete. * Jadex Rules pays close attention to rule debugging. The state as well as the rete engine can be observed at runtime. The rule debugger provides functionalities to execute a rule program stepwise and also use rule breakpoints to stop the execution at those points.

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package jadex.rules.state.javaimpl;

import jadex.rules.state.IOAVState;
import jadex.rules.state.OAVObjectType;

import java.util.LinkedHashMap;
import java.util.Map;

/**
 *  Simplest possible id generatorusing plain objects.
 */
public class OAVObjectIdGenerator implements IOAVIdGenerator
{
	//-------- attributes --------
	
	/** The flag indicating if content ids should be produced. */
	protected boolean iscontentid;
		
	//-------- constructor --------
	
	/**
	 *  Create a new id generator.
	 */
	public OAVObjectIdGenerator()
	{
		this(false);
	}
	
	/**
	 *  Create a new id generator.
	 */
	public OAVObjectIdGenerator(boolean iscontentid)
	{
		this.iscontentid = iscontentid;
	}
	
	/**
	 *  Create a unique id.
	 *  @param state	The state.
	 *  @param type	The object type.
	 *  @return The new id.
	 */
	public Object createId(IOAVState state, OAVObjectType type)
	{
		return iscontentid? new OAVContentId(): new Object();

	}
	
	/**
	 *  Test if an object is an id.
	 *  @param state	The state.
	 *  @param type	The object type.
	 *  @return The new id.
	 */
	public boolean	isId(Object id)
	{
		// note: does not always work.
		return id!=null && (id.getClass()==Object.class || id instanceof OAVContentId);
	}

	//-------- helper classes --------
	
	/**
	 *  An id for an OAV object.
	 */
	private static class OAVContentId implements IOAVContentId
	{
		//-------- attributes --------
		
		/** The content map. */
		protected Map	content;
		
		//-------- constructors --------
		
		/**
		 *  Create an OAV object id with the given id value.
		 *  @param id The id value.
		 */
		public OAVContentId()
		{
			this.content = new LinkedHashMap();
		}
	
		//-------- methods --------
		
		/**
		 *  Get the content.
		 *  @return The content.
		 */
		public Map getContent()
		{
			return content;
		}
	}
}