node.java

该工具也是用于字节码插桩

/*
 * Node.java
 *
 * Created on July 20, 2001, 12:18 AM
 *
 * See LICENSE file for license conditions.
 */

package residue.graph;

import java.util.*;
import org.apache.bcel.generic.*;

/**
 * This class is the node used in graphing control flow in
 * programs.
 *
 * @author  Carl Howells
 * @version 
 */
public class Node extends Observable
{
	private Set edges;
	private int line;
	private InstructionHandle insHandle;
	private BasicBlock block;
	
	// position is only accurate before changes are made to the graph.
	private int pos;
	
	private int incomingEdges;
	
	public Node(InstructionHandle ih, int lnum)
	{
		line = lnum;
		insHandle = ih;
		edges = new HashSet();
		pos = ih.getPosition();
	} // Node
	
	public void addEdge(Node t)
	{
		if (edges.add(t))
			t.incomingEdges++;
	} // addEdge
	
	public int getLine()
	{
		return line;
	} // getLine
	
	public InstructionHandle getInstruction()
	{
		return insHandle;
	} // getInstruction
	
	public int getPosition()
	{
		return pos;
	} // getPosition
	
	public int getNumberIncomingEdges()
	{
		return incomingEdges;
	} // getNumberIncomingEdges
	
	public void setBlock(BasicBlock b)
	{
		block = b;
		setChanged();
		notifyObservers(b);
	} // setBlock
	
	public BasicBlock getBlock()
	{
		return block;
	} // getBlock
	
	/**
	 * Returns a write protected version of the set of edges.
	 */
	public Set getEdges()
	{
		return Collections.unmodifiableSet(edges);
	} // getEdges
	
} // class Node