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A tool for localizing the software regression errors

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package de.hdu.pvs.crashfinder.util;

import japa.parser.JavaParser;
import japa.parser.ast.CompilationUnit;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import com.google.common.io.Closer;

/**
 * 
 * @author Dominik Fay. Created in October 2015.
 */

public class PackageExtractor {
	private final File file;

	public PackageExtractor(File file) {
		this.file = file;
	}

	public String extractPackageName() throws IOException {
		Closer closer = Closer.create();
		try {
			FileInputStream fis = closer.register(new FileInputStream(file));
			CompilationUnit cu = JavaParser.parse(fis);
			return cu.getPackage().getName().toString();
		} catch (Throwable t) {
			closer.rethrow(t);
		} finally {
			closer.close();
		}
		throw new IOException("Could not extract package name.");
	}
}