Class JarFileUrlJar

java/org/apache/tomcat/util/scan/JarFileUrlJar.java:40–227

Implementation of Jar that is optimised for file based JAR URLs that refer directly to a JAR file (e.g. URLs of the form jar:file: ... .jar!/ or file:... .jar).

 * of the form jar:file: ... .jar!/ or file:... .jar).
 */
public class JarFileUrlJar implements Jar {

    private final JarFile jarFile;
    private final URL jarFileURL;
    private final boolean multiRelease;
    private Enumeration<JarEntry> entries;
    private Set<String> entryNamesSeen;
    private JarEntry entry = null;

    /**
     * Constructs a new JarFileUrlJar.
     *
     * @param url the URL of the JAR file
     * @param startsWithJar whether the URL starts with "jar:"
     * @throws IOException if an I/O error occurs
     */
    public JarFileUrlJar(URL url, boolean startsWithJar) throws IOException {
        if (startsWithJar) {
            // jar:file:...
            JarURLConnection jarConn = (JarURLConnection) url.openConnection();
            jarConn.setUseCaches(false);
            jarFile = jarConn.getJarFile();
            jarFileURL = jarConn.getJarFileURL();
        } else {
            // file:...
            File f;
            try {
                f = new File(url.toURI());
            } catch (URISyntaxException e) {
                throw new IOException(e);
            }
            jarFile = new JarFile(f, true, ZipFile.OPEN_READ, Runtime.version());
            jarFileURL = url;
        }
        boolean multiReleaseValue = false;
        try {
            multiReleaseValue = jarFile.isMultiRelease();
        } catch (IllegalStateException ignore) {
            /*
             * ISE can be thrown if the JAR URL is bad, for example:
             * https://github.com/spring-projects/spring-boot/issues/33633
             *
             * The Javadoc does not document that ISE and given what it does for a vanilla IOE, this looks like a Java
             * bug, it should return false instead.
             */
        }
        multiRelease = multiReleaseValue;
    }


    @Override
    public URL getJarFileURL() {
        return jarFileURL;
    }


    @Override
    public InputStream getInputStream(String name) throws IOException {