dfscfgprinter.java

一个查找java程序里bug的程序的源代码,该程序本身也是java写的,对提高java编程水平很有用

/*
 * Bytecode Analysis Framework
 * Copyright (C) 2003,2004 University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.ba;

public class DFSCFGPrinter extends CFGPrinter implements DFSEdgeTypes {
	private DepthFirstSearch dfs;

	public DFSCFGPrinter(CFG cfg, DepthFirstSearch dfs) {
		super(cfg);
		this.dfs = dfs;
	}

	public String edgeAnnotate(Edge edge) {
		int dfsEdgeType = dfs.getDFSEdgeType(edge);
		switch (dfsEdgeType) {
		case UNKNOWN_EDGE:
			return "UNKNOWN_EDGE";
		case TREE_EDGE:
			return "TREE_EDGE";
		case BACK_EDGE:
			return "BACK_EDGE";
		case CROSS_EDGE:
			return "CROSS_EDGE";
		case FORWARD_EDGE:
			return "FORWARD_EDGE";
		default:
			throw new IllegalStateException("no DFS edge type?");
		}
	}
}