locator.java

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        uri = buf.toString().replace('/', File.separatorChar);

        if (File.pathSeparatorChar == ';' && uri.startsWith("\\") && uri.length() > 2
            && Character.isLetter(uri.charAt(1)) && uri.lastIndexOf(':') > -1) {
            uri = uri.substring(1);
        }
        String path = null;
        try {
            path = decodeUri(uri);
            String cwd = System.getProperty("user.dir");
            int posi = cwd.indexOf(":");
            if ((posi > 0) && path.startsWith(File.separator)) {
               path = cwd.substring(0, posi + 1) + path;
            }
        } catch (UnsupportedEncodingException exc) {
            // not sure whether this is clean, but this method is
            // declared not to throw exceptions.
            throw new IllegalStateException(
                "Could not convert URI " + uri + " to path: "
                + exc.getMessage());
        }
        return path;
    }

    /**
     * Decodes an Uri with % characters.
     * The URI is escaped
     * @param uri String with the uri possibly containing % characters.
     * @return The decoded Uri
     * @throws UnsupportedEncodingException if UTF-8 is not available
     * @since Ant 1.7
     */
    public static String decodeUri(String uri) throws UnsupportedEncodingException {
        if (uri.indexOf('%') == -1) {
            return uri;
        }
        ByteArrayOutputStream sb = new ByteArrayOutputStream(uri.length());
        CharacterIterator iter = new StringCharacterIterator(uri);
        for (char c = iter.first(); c != CharacterIterator.DONE;
             c = iter.next()) {
            if (c == '%') {
                char c1 = iter.next();
                if (c1 != CharacterIterator.DONE) {
                    int i1 = Character.digit(c1, WORD);
                    char c2 = iter.next();
                    if (c2 != CharacterIterator.DONE) {
                        int i2 = Character.digit(c2, WORD);
                        sb.write((char) ((i1 << NIBBLE) + i2));
                    }
                }
            } else {
                sb.write(c);
            }
        }
        return sb.toString(URI_ENCODING);
    }

    /**
     * Encodes an Uri with % characters.
     * The URI is escaped
     * @param path String to encode.
     * @return The encoded string, according to URI norms
     * @throws UnsupportedEncodingException if UTF-8 is not available
     * @since Ant 1.7
     */
    public static String encodeURI(String path) throws UnsupportedEncodingException {
        int i = 0;
        int len = path.length();
        int ch = 0;
        StringBuffer sb = null;
        for (; i < len; i++) {
            ch = path.charAt(i);
            // if it's not an ASCII character, break here, and use UTF-8 encoding
            if (ch >= ASCII_SIZE) {
                break;
            }
            if (gNeedEscaping[ch]) {
                if (sb == null) {
                    sb = new StringBuffer(path.substring(0, i));
                }
                sb.append('%');
                sb.append(gAfterEscaping1[ch]);
                sb.append(gAfterEscaping2[ch]);
                // record the fact that it's escaped
            } else if (sb != null) {
                sb.append((char) ch);
            }
        }

        // we saw some non-ascii character
        if (i < len) {
            if (sb == null) {
                sb = new StringBuffer(path.substring(0, i));
            }
            // get UTF-8 bytes for the remaining sub-string
            byte[] bytes = null;
            byte b;
            bytes = path.substring(i).getBytes(URI_ENCODING);
            len = bytes.length;

            // for each byte
            for (i = 0; i < len; i++) {
                b = bytes[i];
                // for non-ascii character: make it positive, then escape
                if (b < 0) {
                    ch = b + BYTE_SIZE;
                    sb.append('%');
                    sb.append(gHexChs[ch >> NIBBLE]);
                    sb.append(gHexChs[ch & NIBBLE_MASK]);
                } else if (gNeedEscaping[b]) {
                    sb.append('%');
                    sb.append(gAfterEscaping1[b]);
                    sb.append(gAfterEscaping2[b]);
                } else {
                    sb.append((char) b);
                }
            }
        }
        return sb == null ? path : sb.toString();
    }

    /**
     * Convert a File to a URL.
     * File.toURL() does not encode characters like #.
     * File.toURI() has been introduced in java 1.4, so
     * ANT cannot use it (except by reflection)
     * FileUtils.toURI() cannot be used by Locator.java
     * Implemented this way.
     * File.toURL() adds file: and changes '\' to '/' for dos OSes
     * encodeURI converts characters like ' ' and '#' to %DD
     * @param file the file to convert
     * @return URL the converted File
     * @throws MalformedURLException on error
     */
    public static URL fileToURL(File file)
        throws MalformedURLException {
        try {
            return new URL(encodeURI(file.toURL().toString()));
        } catch (UnsupportedEncodingException ex) {
            throw new MalformedURLException(ex.toString());
        }
    }

    /**
     * Get the File necessary to load the Sun compiler tools. If the classes
     * are available to this class, then no additional URL is required and
     * null is returned. This may be because the classes are explicitly in the
     * class path or provided by the JVM directly.
     *
     * @return the tools jar as a File if required, null otherwise.
     */
    public static File getToolsJar() {
        // firstly check if the tools jar is already in the classpath
        boolean toolsJarAvailable = false;
        try {
            // just check whether this throws an exception
            Class.forName("com.sun.tools.javac.Main");
            toolsJarAvailable = true;
        } catch (Exception e) {
            try {
                Class.forName("sun.tools.javac.Main");
                toolsJarAvailable = true;
            } catch (Exception e2) {
                // ignore
            }
        }
        if (toolsJarAvailable) {
            return null;
        }
        // couldn't find compiler - try to find tools.jar
        // based on java.home setting
        String libToolsJar
            = File.separator + "lib" + File.separator + "tools.jar";
        String javaHome = System.getProperty("java.home");
        File toolsJar = new File(javaHome + libToolsJar);
        if (toolsJar.exists()) {
            // Found in java.home as given
            return toolsJar;
        }
        if (javaHome.toLowerCase(Locale.US).endsWith(File.separator + "jre")) {
            javaHome = javaHome.substring(
                0, javaHome.length() - "/jre".length());
            toolsJar = new File(javaHome + libToolsJar);
        }
        if (!toolsJar.exists()) {
            System.out.println("Unable to locate tools.jar. "
                 + "Expected to find it in " + toolsJar.getPath());
            return null;
        }
        return toolsJar;
    }

    /**
     * Get an array of URLs representing all of the jar files in the
     * given location. If the location is a file, it is returned as the only
     * element of the array. If the location is a directory, it is scanned for
     * jar files.
     *
     * @param location the location to scan for Jars.
     *
     * @return an array of URLs for all jars in the given location.
     *
     * @exception MalformedURLException if the URLs for the jars cannot be
     *            formed.
     */
    public static URL[] getLocationURLs(File location)
         throws MalformedURLException {
        return getLocationURLs(location, new String[]{".jar"});
    }

    /**
     * Get an array of URLs representing all of the files of a given set of
     * extensions in the given location. If the location is a file, it is
     * returned as the only element of the array. If the location is a
     * directory, it is scanned for matching files.
     *
     * @param location the location to scan for files.
     * @param extensions an array of extension that are to match in the
     *        directory search.
     *
     * @return an array of URLs of matching files.
     * @exception MalformedURLException if the URLs for the files cannot be
     *            formed.
     */
    public static URL[] getLocationURLs(File location,
                                        final String[] extensions)
         throws MalformedURLException {
        URL[] urls = new URL[0];

        if (!location.exists()) {
            return urls;
        }
        if (!location.isDirectory()) {
            urls = new URL[1];
            String path = location.getPath();
            String littlePath = path.toLowerCase(Locale.US);
            for (int i = 0; i < extensions.length; ++i) {
                if (littlePath.endsWith(extensions[i])) {
                    urls[0] = fileToURL(location);
                    break;
                }
            }
            return urls;
        }
        File[] matches = location.listFiles(
            new FilenameFilter() {
                public boolean accept(File dir, String name) {
                    String littleName = name.toLowerCase(Locale.US);
                    for (int i = 0; i < extensions.length; ++i) {
                        if (littleName.endsWith(extensions[i])) {
                            return true;
                        }
                    }
                    return false;
                }
            });
        urls = new URL[matches.length];
        for (int i = 0; i < matches.length; ++i) {
            urls[i] = fileToURL(matches[i]);
        }
        return urls;
    }
}