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Fabric3 Contribution Scanner SPI.

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package org.fabric3.spi.scanner;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.fabric3.spi.scanner.AbstractResource;

/**
 * Represents a file that is to be contributed to a domain
 *
 * @version $Rev: 3581 $ $Date: 2008-04-07 23:04:07 -0700 (Mon, 07 Apr 2008) $
 */
public class FileResource extends AbstractResource {
    private File file;

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

    public String getName() {
        return file.getName();
    }

    public URL getLocation() {
        try {
            return file.toURI().normalize().toURL();
        } catch (MalformedURLException e) {
            throw new AssertionError(e);
        }
    }

    public long getTimestamp() {
        return file.lastModified();
    }

    public void reset() throws IOException {
        checksumValue = checksum();
    }

    protected byte[] checksum() throws IOException {
        BufferedInputStream is = null;
        try {
            MessageDigest checksum = MessageDigest.getInstance("MD5");
            is = new BufferedInputStream(new FileInputStream(file));
            byte[] bytes = new byte[1024];
            int len;

            while ((len = is.read(bytes)) >= 0) {
                checksum.update(bytes, 0, len);
            }
            return checksum.digest();
        } catch (NoSuchAlgorithmException e) {
            throw new AssertionError(e);
        } finally {
            if (is != null) {
                is.close();
            }
        }

    }
}