/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2003-2005, Mike Fagan <mfagan@tde.com>
 * 
 * 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.detect;


import java.io.PrintStream;
import java.util.BitSet;

import org.apache.bcel.classfile.Code;
import org.apache.bcel.classfile.Field;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.LineNumber;
import org.apache.bcel.classfile.Method;

import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.BugReporterObserver;
import edu.umd.cs.findbugs.Detector;
import edu.umd.cs.findbugs.NonReportingDetector;
import edu.umd.cs.findbugs.ProjectStats;
import edu.umd.cs.findbugs.ba.AnalysisContext;
import edu.umd.cs.findbugs.ba.ClassContext;
import edu.umd.cs.findbugs.visitclass.PreorderVisitor;

public class FindBugsSummaryStats extends PreorderVisitor
		implements Detector, BugReporterObserver, NonReportingDetector {
	private ProjectStats stats;

	   BitSet lines = new BitSet(500);
	   int methods = 0;
	   int fields = 0;
	   int classCodeSize;
	   int totalNCSS = 0;
	   int totalCodeSize = 0;
	   int totalMethods = 0;
	   int totalFields = 0;
	   boolean sawLineNumbers;


	   @Override
	   public void visitJavaClass(JavaClass obj) {
		   if (AnalysisContext.currentAnalysisContext().isApplicationClass(obj))
			   super.visitJavaClass(obj);
	   }
	   @Override
			public void visit(JavaClass obj) {

		lines.clear();
		methods = 0;
		fields = 0;
		classCodeSize = 0;
		   sawLineNumbers = false;
		}
	   @Override
			public void visit(Method obj) {
		methods++;
		}
	   @Override
			public void visit(Field obj) {
		fields++;
		}
	   @Override
			public void visit(Code obj) {
		classCodeSize += obj.getCode().length;
		}

	   @Override
			public void visitAfter(JavaClass obj) {
		   int linesNCSS = 1 + methods + fields;
		   if (sawLineNumbers) 
			   linesNCSS += lines.cardinality();
		   else
			   linesNCSS += classCodeSize / 10;
		   if (stats != null) 
			stats.addClass(getDottedClassName(), obj.getSourceFileName(),
					obj.isInterface(), linesNCSS);
			totalCodeSize += classCodeSize;
			totalNCSS += linesNCSS;
			totalMethods += methods;
			totalFields += fields;

		}

	   @Override
			public void visit(LineNumber obj) {
		   sawLineNumbers = true;
		int line = obj.getLineNumber();
		lines.set(line);
			}


	public FindBugsSummaryStats(BugReporter bugReporter) {
		this.stats = bugReporter.getProjectStats();
		bugReporter.addObserver(this);
	}
	public FindBugsSummaryStats() {
		this.stats =null;
	}

	public void visitClassContext(ClassContext classContext) {
		classContext.getJavaClass().accept(this);
	}

	public void report() {
	}
	@Override
		 public void report(PrintStream out) {
		out.println("NCSS\t" + totalNCSS);
		out.println("codeSz\t" + totalCodeSize);
		out.println("methods\t" + totalMethods);
		out.println("fields\t" + totalFields);
	}

	public void reportBug(BugInstance bug) {
		stats.addBug(bug);
	}



}
