content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  // PublicId.java - Information about public identifiers
  
  /*
   * Copyright 2001-2004 The Apache Software Foundation or its licensors,
   * as applicable.
   *
   * 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 jaxp.sun.org.apache.xml.internal.resolver.helpers;
  
  /**
   * Static methods for dealing with public identifiers.
   *
   * <p>This class defines a set of static methods that can be called
   * to handle public identifiers.</p>
   *
   * @author Norman Walsh
   * <a href="mailto:Norman.Walsh@Sun.COM">Norman.Walsh@Sun.COM</a>
   *
   */
  public abstract class PublicId {
    protected PublicId() { }
  
    /**
     * Normalize a public identifier.
     *
     * <p>Public identifiers must be normalized according to the following
     * rules before comparisons between them can be made:</p>
     *
     * <ul>
     * <li>Whitespace characters are normalized to spaces (e.g., line feeds,
     * tabs, etc. become spaces).</li>
     * <li>Leading and trailing whitespace is removed.</li>
     * <li>Multiple internal whitespaces are normalized to a single
     * space.</li>
     * </ul>
     *
     * <p>This method is declared static so that other classes
     * can use it directly.</p>
     *
     * @param publicId The unnormalized public identifier.
     *
     * @return The normalized identifier.
     */
    public static String normalize(String publicId) {
      String normal = publicId.replace('\t', ' ');
      normal = normal.replace('\r', ' ');
      normal = normal.replace('\n', ' ');
      normal = normal.trim();
  
      int pos;
  
      while ((pos = normal.indexOf("  ")) >= 0) {
        normal = normal.substring(0, pos) + normal.substring(pos+1);
      }
  
      return normal;
    }
  
    /**
     * Encode a public identifier as a "publicid" URN.
     *
     * <p>This method is declared static so that other classes
     * can use it directly.</p>
     *
     * @param publicId The unnormalized public identifier.
     *
     * @return The normalized identifier.
     */
    public static String encodeURN(String publicId) {
      String urn = PublicId.normalize(publicId);
  
      urn = PublicId.stringReplace(urn, "%", "%25");
      urn = PublicId.stringReplace(urn, ";", "%3B");
      urn = PublicId.stringReplace(urn, "'", "%27");
      urn = PublicId.stringReplace(urn, "?", "%3F");
      urn = PublicId.stringReplace(urn, "#", "%23");
      urn = PublicId.stringReplace(urn, "+", "%2B");
      urn = PublicId.stringReplace(urn, " ", "+");
      urn = PublicId.stringReplace(urn, "::", ";");
      urn = PublicId.stringReplace(urn, ":", "%3A");
      urn = PublicId.stringReplace(urn, "//", ":");
      urn = PublicId.stringReplace(urn, "/", "%2F");
  
      return "urn:publicid:" + urn;
    }
  
    /**
     * Decode a "publicid" URN into a public identifier.
     *
     * <p>This method is declared static so that other classes
     * can use it directly.</p>
     *
     * @param urn The urn:publicid: URN
     *
     * @return The normalized identifier.
     */
    public static String decodeURN(String urn) {
      String publicId = "";
  
      if (urn.startsWith("urn:publicid:")) {
        publicId = urn.substring(13);
      } else {
        return urn;
      }
  
      publicId = PublicId.stringReplace(publicId, "%2F", "/");
      publicId = PublicId.stringReplace(publicId, ":", "//");
      publicId = PublicId.stringReplace(publicId, "%3A", ":");
      publicId = PublicId.stringReplace(publicId, ";", "::");
      publicId = PublicId.stringReplace(publicId, "+", " ");
      publicId = PublicId.stringReplace(publicId, "%2B", "+");
      publicId = PublicId.stringReplace(publicId, "%23", "#");
      publicId = PublicId.stringReplace(publicId, "%3F", "?");
      publicId = PublicId.stringReplace(publicId, "%27", "'");
      publicId = PublicId.stringReplace(publicId, "%3B", ";");
      publicId = PublicId.stringReplace(publicId, "%25", "%");
  
      return publicId;
      }
  
    /**
     * Replace one string with another.
     *
     */
    private static String stringReplace(String str,
                                        String oldStr,
                                        String newStr) {
  
      String result = "";
      int pos = str.indexOf(oldStr);
  
      //    System.out.println(str + ": " + oldStr + " => " + newStr);
  
      while (pos >= 0) {
        //      System.out.println(str + " (" + pos + ")");
        result += str.substring(0, pos);
        result += newStr;
        str = str.substring(pos+1);
  
        pos = str.indexOf(oldStr);
      }
  
      return result + str;
    }
  }
  