/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2005, 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.model;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import org.apache.bcel.Repository;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.JavaClass;

import edu.umd.cs.findbugs.BugCollection;
import edu.umd.cs.findbugs.Project;
import edu.umd.cs.findbugs.SortedBugCollection;

/**
 * Repopulate a BugCollection with class features from
 * the classes in a specified jar file.
 * 
 * @author David Hovemeyer
 */
public class RegenerateClassFeatures {
	private BugCollection bugCollection;
	private String jarFile;

	public RegenerateClassFeatures(BugCollection bugCollection, String jarFile) {
		this.bugCollection = bugCollection;
		this.jarFile = jarFile;
	}

	public RegenerateClassFeatures execute() throws IOException {
		bugCollection.clearClassFeatures();

		ZipFile zipFile = new ZipFile(jarFile);

		ArrayList<JavaClass> classList = new ArrayList<JavaClass>();

		// Add all classes to repository (for hierarchy queries)
		Enumeration<? extends ZipEntry> entries = zipFile.entries();
		while (entries.hasMoreElements()) {
			ZipEntry entry = entries.nextElement();

			if (!entry.getName().endsWith(".class"))
				continue;

			ClassParser parser = new ClassParser(zipFile.getInputStream(entry), entry.getName());
			JavaClass javaClass = parser.parse();

			Repository.addClass(javaClass);
			classList.add(javaClass);
		}

		for (JavaClass javaClass : classList) {
			ClassFeatureSet classFeatureSet = new ClassFeatureSet().initialize(javaClass);
			bugCollection.setClassFeatureSet(classFeatureSet);
		}

		return this;
	}

	/**
	 * @return Returns the bugCollection.
	 */
	public BugCollection getBugCollection() {
		return bugCollection;
	}

	public static void main(String[] args) throws Exception {
		if (args.length != 2) {
			System.err.println("Usage: " + RegenerateClassFeatures.class.getName() + " <bug collection> <jar file>");
			System.exit(1);
		}

		SortedBugCollection bugCollection = new SortedBugCollection();
		Project project = new Project();

		bugCollection.readXML(args[0], project);

		new RegenerateClassFeatures(bugCollection, args[1]).execute();

		bugCollection.writeXML(System.out, project);
	}
}
