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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.rulesystem.rete.builder;

import jadex.rules.rulesystem.rules.Variable;

/**
 *  A variable info saves information about the first occurrence of a variable,
 *  i.e. its declaration and first binding.
 */
public class VarInfo
{
	//-------- attributes --------
	
	/** The variable. */
	private Variable var;
	
	/** The tupleindex. */
	private int tupleindex;
	
	/** The value source. */
	private Object valuesource;
	
	/** The subindex. */
	private int subindex;
	
	
	//-------- constructors --------
	
	/**
	 *  Create a new VarInfo.
	 *  @param var The variable.
	 *  @param tupleindex The tuple index.
	 *  @param attr The attribute.
	 *  @param subindex The subindex.
	 */
	public VarInfo(Variable var, int tupleindex, Object valuesource, int subindex)
	{
		this.var = var;
		this.tupleindex = tupleindex;
		this.valuesource = valuesource;
		this.subindex = subindex;
	}
	
	//-------- methods --------

	/**
	 *  Get the variable.
	 *  @return The variable.
	 */
	public Variable getVariable()
	{
		return var;
	}

	/**
	 *  Get the tupleindex.
	 *  @return The tupleindex.
	 */
	public int getTupleIndex()
	{
		return tupleindex;
	}

	/**
	 *  Get the subindex.
	 *  @return The subindex.
	 */
	public int getSubindex()
	{
		return subindex;
	}
	
	/**
	 *  Get the value source.
	 *  @return The value source.
	 */
	public Object getValueSource()
	{
		return valuesource;
	}

	/**
	 *  Get the string representation.
	 *  @return The string representation.
	 */
	public String toString()
	{
		return var+": "+tupleindex+" "+valuesource+" "+subindex;
	}
}