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  package org.richfaces.json;
  
  /*
   Copyright (c) 2002 JSON.org
  
   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
   in the Software without restriction, including without limitation the rights
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
 
  The Software shall be used for Good, not Evil.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  */
 
This provides static methods to convert an XML text into a JSONObject, and to covert a JSONObject into an XML text.

Author(s):
JSON.org
Version:
2
 
 public final class XML {
    
The Character '&'.
 
     public static final Character AMP = new Character('&');
    
The Character '''.
 
     public static final Character APOS = new Character('\'');
    
The Character '!'.
 
     public static final Character BANG = new Character('!');
    
The Character '='.
 
     public static final Character EQ = new Character('=');
    
The Character '>'.
 
     public static final Character GT = new Character('>');
The Character '<'.
 
     public static final Character LT = new Character('<');
    
The Character '?'.
 
     public static final Character QUEST = new Character('?');
    
The Character '"'.
 
     public static final Character QUOT = new Character('"');
    
The Character '/'.
 
     public static final Character SLASH = new Character('/');
 
     private XML() {
     }

    
Replace special characters with XML escapes:
 & (ampersand) is replaced by &amp;
 < (less than) is replaced by &lt;
 > (greater than) is replaced by &gt;
 " (double quote) is replaced by &quot;
 

Parameters:
string The string to be escaped.
Returns:
The escaped string.
 
     public static String escape(String string) {
         StringBuffer sb = new StringBuffer();
         int len = string.length();
 
         for (int i = 0; i < leni++) {
             char c = string.charAt(i);
 
             switch (c) {
                 case '&':
                     sb.append("&amp;");
 
                    break;
                case '<':
                    sb.append("&lt;");
                    break;
                case '>':
                    sb.append("&gt;");
                    break;
                case '"':
                    sb.append("&quot;");
                    break;
                default:
                    sb.append(c);
            }
        }
        return sb.toString();
    }

    
Scan the content following the named tag, attaching it to the context.

Parameters:
x The XMLTokener containing the source string.
context The JSONObject that will include the new material.
name The tag name.
Returns:
true if the close tag is processed.
Throws:
JSONException
    private static boolean parse(XMLTokener xJSONObject contextString namethrows JSONException {
        char c;
        int i;
        String n;
        JSONObject o = null;
        String s;
        Object t;
        // Test for and skip past these forms:
        // <!-- ... -->
        // <! ... >
        // <![ ... ]]>
        // <? ... ?>
        // Report errors for these forms:
        // <>
        // <=
        // <<
        t = x.nextToken();
        // <!
        if (t == ) {
            c = x.next();
            if (c == '-') {
                if (x.next() == '-') {
                    x.skipPast("-->");
                    return false;
                }
                x.back();
            } else if (c == '[') {
                t = x.nextToken();
                if (t.equals("CDATA")) {
                    if (x.next() == '[') {
                        s = x.nextCDATA();
                        if (s.length() > 0) {
                            context.accumulate("content"s);
                        }
                        return false;
                    }
                }
                throw x.syntaxError("Expected 'CDATA['");
            }
            i = 1;
            do {
                t = x.nextMeta();
                if (t == null) {
                    throw x.syntaxError("Missing '>' after '<!'.");
                } else if (t == ) {
                    i += 1;
                } else if (t == ) {
                    i -= 1;
                }
            } while (i > 0);
            return false;
        } else if (t == ) {
            // <?
            x.skipPast("?>");
            return false;
        } else if (t == ) {
            // Close tag </
            if ((name == null) || !x.nextToken().equals(name)) {
                throw x.syntaxError("Mismatched close tag");
            }
            if (x.nextToken() != ) {
                throw x.syntaxError("Misshaped close tag");
            }
            return true;
        } else if (t instanceof Character) {
            throw x.syntaxError("Misshaped tag");
            // Open tag <
        } else {
            n = (Stringt;
            t = null;
            o = new JSONObject();
            for (;;) {
                if (t == null) {
                    t = x.nextToken();
                }
                // attribute = value
                if (t instanceof String) {
                    s = (Stringt;
                    t = x.nextToken();
                    if (t == ) {
                        t = x.nextToken();
                        if (!(t instanceof String)) {
                            throw x.syntaxError("Missing value");
                        }
                        o.accumulate(st);
                        t = null;
                    } else {
                        o.accumulate(s"");
                    }
                    // Empty tag <.../>
                } else if (t == ) {
                    if (x.nextToken() != ) {
                        throw x.syntaxError("Misshaped tag");
                    }
                    context.accumulate(no);
                    return false;
                    // Content, between <...> and </...>
                } else if (t == ) {
                    for (;;) {
                        t = x.nextContent();
                        if (t == null) {
                            if (name != null) {
                                throw x.syntaxError("Unclosed tag " + name);
                            }
                            return false;
                        } else if (t instanceof String) {
                            s = (Stringt;
                            if (s.length() > 0) {
                                o.accumulate("content"s);
                            }
                            // Nested element
                        } else if (t == ) {
                            if (parse(xon)) {
                                if (o.length() == 0) {
                                    context.accumulate(n"");
                                } else if ((o.length() == 1) && (o.opt("content") != null)) {
                                    context.accumulate(no.opt("content"));
                                } else {
                                    context.accumulate(no);
                                }
                                return false;
                            }
                        }
                    }
                } else {
                    throw x.syntaxError("Misshaped tag");
                }
            }
        }
    }

    
Convert a well-formed (but not necessarily valid) XML string into a JSONObject. Some information may be lost in this transformation because JSON is a data format and XML is a document format. XML uses elements, attributes, and content text, while JSON uses unordered collections of name/value pairs and arrays of values. JSON does not does not like to distinguish between elements and attributes. Sequences of similar elements are represented as JSONArrays. Content text may be placed in a "content" member. Comments, prologs, DTDs, and <[ [ ]]> are ignored.

Parameters:
string The source string.
Returns:
A JSONObject containing the structured data from the XML string.
Throws:
JSONException
    public static JSONObject toJSONObject(String stringthrows JSONException {
        JSONObject o = new JSONObject();
        XMLTokener x = new XMLTokener(string);
        while (x.more()) {
            x.skipPast("<");
            parse(xonull);
        }
        return o;
    }

    
Convert a JSONObject into a well-formed, element-normal XML string.

Parameters:
o A JSONObject.
Returns:
A string.
Throws:
JSONException
    public static String toString(Object othrows JSONException {
        return toString(onull);
    }

    
Convert a JSONObject into a well-formed, element-normal XML string.

Parameters:
o A JSONObject.
tagName The optional name of the enclosing tag.
Returns:
A string.
Throws:
JSONException
    public static String toString(Object oString tagNamethrows JSONException {
        StringBuffer b = new StringBuffer();
        int i;
        JSONArray ja;
        JSONObject jo;
        String k;
        Iterator keys;
        int len;
        String s;
        Object v;
        if (o instanceof JSONObject) {
            // Emit <tagName>
            if (tagName != null) {
                b.append('<');
                b.append(tagName);
                b.append('>');
            }
            // Loop thru the keys.
            jo = (JSONObjecto;
            keys = jo.keys();
            while (keys.hasNext()) {
                k = keys.next().toString();
                v = jo.get(k);
                if (v instanceof String) {
                    s = (Stringv;
                } else {
                    s = null;
                }
                // Emit content in body
                if (k.equals("content")) {
                    if (v instanceof JSONArray) {
                        ja = (JSONArrayv;
                        len = ja.length();
                        for (i = 0; i < leni += 1) {
                            if (i > 0) {
                                b.append('\n');
                            }
                            b.append(escape(ja.get(i).toString()));
                        }
                    } else {
                        b.append(escape(v.toString()));
                    }
                    // Emit an array of similar keys
                } else if (v instanceof JSONArray) {
                    ja = (JSONArrayv;
                    len = ja.length();
                    for (i = 0; i < leni += 1) {
                        b.append(toString(ja.get(i), k));
                    }
                } else if (v.equals("")) {
                    b.append('<');
                    b.append(k);
                    b.append("/>");
                    // Emit a new tag <k>
                } else {
                    b.append(toString(vk));
                }
            }
            if (tagName != null) {
                // Emit the </tagname> close tag
                b.append("</");
                b.append(tagName);
                b.append('>');
            }
            return b.toString();
            // XML does not have good support for arrays. If an array appears in a place
            // where XML is lacking, synthesize an <array> element.
        } else if (o instanceof JSONArray) {
            ja = (JSONArrayo;
            len = ja.length();
            for (i = 0; i < len; ++i) {
                b.append(toString(ja.opt(i), (tagName == null) ? "array" : tagName));
            }
            return b.toString();
        } else {
            s = (o == null) ? "null" : escape(o.toString());
            return (tagName == null) ? "\"" + s + "\"" : (s.length() == 0) ? "<" + tagName + "/>" : "<" + tagName + ">" + s
                + "</" + tagName + ">";
        }
    }
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