projection.java

toocom源代码,主要应用在本体匹配方面!

package toocom.ocgl;

import java.net.*;
import java.io.*;
import java.util.*;
import toocom.exceptions.*;

/**
 * This class represents a projection from a graph into another one.
 *
 * @author Fr閐閞ic F黵st
 */
public class Projection{
	
	private Graph g1,g2;
	// Projection table : idFrom (g1) /idInto (g2)
	private IdTable proj;
	
	/** Creates a Projection from g1 into g2. */
	public Projection(Graph g1, Graph g2){
		this.g1 = g1;
		this.g2 = g2;
		this.proj = new IdTable();
	}
		
	public Graph getProjectedGraph(){
		return g1;
	}
	
	public Graph getTargetGraph(){
		return g2;
	}
	
	/** Add a correspondance between the two graphs if the two id exists in the corresponding 
	 *  graphs. */
	public void setCorrespondance(int idFrom,int idInto){
		proj.put(idFrom,idInto);
	}
	
	/** Returns a table which contains the couple of id (idFrom (g1) / idTo (g2)) that 
	 *  represent the projection. */
	public IdTable getCorrespondances(){
		return this.proj;
	}
	
	/** Returns the id of the conceptual primitive, of the graph in which the projection is
	 *  done, which is the image of the primitive with the given id in the projected graph.
	 *  Returns -1 if any correspondance exist. */
	public int getCorrespondance(int idFrom){
		return proj.get(idFrom);
	}
	
	/** Returns true if p1 and p2 are reciprocal, that is p1:G1->G2 and p2:G2->G1 and 
	 *  the couples of nodes of p1 and p2 are the same, but inverted.*/
	public static boolean reciprocalProjections(Projection p1, Projection p2){
		if(p1.getProjectedGraph().equals(p2.getTargetGraph()) && 
		   p1.getTargetGraph().equals(p2.getProjectedGraph()) &&
		   p1.getCorrespondances().size()==p2.getCorrespondances().size()){
		   	boolean result = true;
		   	for(Enumeration e1 = p1.getCorrespondances().keys();e1.hasMoreElements();){
		   		int id1 = ((Integer) e1.nextElement()).intValue();
		   		int id2 = p1.getCorrespondance(id1);
		   		if(p2.getCorrespondance(id2) != id1) result = false;
		   	}
			return result;
		}
		else return false;
	}
	
	public String toString(Language l){
		return ("(" + g1.getTerm(l) + "," + g2.getTerm(l) + ")" + proj.toString());
	}
	
	public String toString(){
		return this.proj.toString();	
	}
	
}