Glassfish example source code file (Util.java)

This example Glassfish source code file (Util.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

a, a, exception, f, get, io, string, string, trying, trying, unsupportedencodingexception, unsupportedencodingexception, util

The Glassfish Util.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.naming;

import java.io.UnsupportedEncodingException;

/**
 * Utility methods originally defined in org.apache.catalina.util.RequestUtil
 * and moved here in order to become accessible to code in web-naming and
 * war-util.
 */

public final class Util {

    /**
     * Normalize a relative URI path that may have relative values ("/./",
     * "/../", and so on ) it it.  <strong>WARNING - This method is
     * useful only for normalizing application-generated paths.  It does not
     * try to perform security checks for malicious input.
     *
     * @param path Relative path to be normalized
     * @param replaceBackSlash Should '\\' be replaced with '/'
     */
    public static String normalize(String path, boolean replaceBackSlash) {
        if (path == null)
            return null;

        // Create a place for the normalized path
        String normalized = path;

        if (replaceBackSlash && normalized.indexOf('\\') >= 0)
            normalized = normalized.replace('\\', '/');

        if (normalized.equals("/."))
            return "/";

        // Add a leading "/" if necessary
        if (!normalized.startsWith("/"))
            normalized = "/" + normalized;

        // Resolve occurrences of "//" in the normalized path
        while (true) {
            int index = normalized.indexOf("//");
            if (index < 0)
                break;
            normalized = normalized.substring(0, index) +
                normalized.substring(index + 1);
        }

        // Resolve occurrences of "/./" in the normalized path
        while (true) {
            int index = normalized.indexOf("/./");
            if (index < 0)
                break;
            normalized = normalized.substring(0, index) +
                normalized.substring(index + 2);
        }

        // Resolve occurrences of "/../" in the normalized path
        while (true) {
            int index = normalized.indexOf("/../");
            if (index < 0)
                break;
            if (index == 0)
                return (null);  // Trying to go outside our context
            int index2 = normalized.lastIndexOf('/', index - 1);
            normalized = normalized.substring(0, index2) +
                normalized.substring(index + 3);
        }

        // Return the normalized path that we have completed
        return (normalized);
    }

    /**
     * Decode and return the specified URL-encoded String.
     * When the byte array is converted to a string, the system default
     * character encoding is used...  This may be different than some other
     * servers.
     *
     * @param str The url-encoded string
     *
     * @exception IllegalArgumentException if a '%' character is not followed
     * by a valid 2-digit hexadecimal number
     */
    public static String urlDecode(String str) {
        return urlDecode(str, null);
    }

    /**
     * Decode and return the specified URL-encoded String.
     *
     * @param str The url-encoded string
     * @param enc The encoding to use; if null, the default encoding is used
     * @exception IllegalArgumentException if a '%' character is not followed
     * by a valid 2-digit hexadecimal number
     */
    public static String urlDecode(String str, String enc) {

        if (str == null)
            return (null);

        // use the specified encoding to extract bytes out of the
        // given string so that the encoding is not lost. If an
        // encoding is not specified, let it use platform default
        byte[] bytes = null;
        try {
            if (enc == null) {
                bytes = str.getBytes();
            } else {
                bytes = str.getBytes(enc);
            }
        } catch (UnsupportedEncodingException uee) {}

        return urlDecode(bytes, enc);

    }

    /**
     * Decode and return the specified URL-encoded byte array.
     *
     * @param bytes The url-encoded byte array
     * @exception IllegalArgumentException if a '%' character is not followed
     * by a valid 2-digit hexadecimal number
     */
    public static String urlDecode(byte[] bytes) {
        return urlDecode(bytes, null);
    }

    /**
     * Decode and return the specified URL-encoded byte array.
     *
     * @param bytes The url-encoded byte array
     * @param enc The encoding to use; if null, the default encoding is used
     * @exception IllegalArgumentException if a '%' character is not followed
     * by a valid 2-digit hexadecimal number
     */
    public static String urlDecode(byte[] bytes, String enc) {

        if (bytes == null)
            return (null);

        int len = bytes.length;
        int ix = 0;
        int ox = 0;
        while (ix < len) {
            byte b = bytes[ix++];     // Get byte to test
            if (b == '+') {
                b = (byte)' ';
            } else if (b == '%') {
                b = (byte) ((convertHexDigit(bytes[ix++]) << 4)
                            + convertHexDigit(bytes[ix++]));
            }
            bytes[ox++] = b;
        }
        if (enc != null) {
            try {
                return new String(bytes, 0, ox, enc);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return new String(bytes, 0, ox);

    }

    /**
     * Convert a byte character value to hexidecimal digit value.
     *
     * @param b the character value byte
     */
    public static byte convertHexDigit( byte b ) {
        if ((b >= '0') && (b <= '9')) return (byte)(b - '0');
        if ((b >= 'a') && (b <= 'f')) return (byte)(b - 'a' + 10);
        if ((b >= 'A') && (b <= 'F')) return (byte)(b - 'A' + 10);
        return 0;
    }

}