Application: gvSIG desktop » gvSIG tools: ToolBox

package org.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 comma delimited text into a JSONArray, and to covert a JSONArray into comma delimited

 * text. Comma delimited text is a very popular format for data interchange. It is understood by most database, spreadsheet, and

 * organizer programs.

 * <p>

 * Each row of text represents a row in a table or a data record. Each row ends with a NEWLINE character. Each row contains one or

 * more values. Values are separated by commas. A value can contain any character except for comma, unless is is wrapped in single

 * quotes or double quotes.

 * <p>

 * The first row usually contains the names of the columns.

 * <p>

 * A comma delimited list can be converted into a JSONArray of JSONObjects. The names for the elements in the JSONObjects can be

 * taken from the names in the first row.

 *

 * @author JSON.org

 * @version 2

 */

public class CDL {

   /**

    * Get the next value. The value can be wrapped in quotes. The value can be empty.

    *

    * @param x

    *                A JSONTokener of the source text.

    * @return The value string, or null if empty.

    * @throws JSONException

    *                 if the quoted string is badly formed.

    */

   private static String getValue(final JSONTokener x) throws JSONException {

      char c;

      do {

         c = x.next();

      }

      while (c <= ' ' && c != 0);

      switch (c) {

         case 0:

            return null;

         case '"':

         case '\'':

            return x.nextString(c);

         case ',':

            x.back();

            return "";

         default:

            x.back();

            return x.nextTo(',');

      }

   }

   /**

    * Produce a JSONArray of strings from a row of comma delimited values.

    *

    * @param x

    *                A JSONTokener of the source text.

    * @return A JSONArray of strings.

    * @throws JSONException

    */

   public static JSONArray rowToJSONArray(final JSONTokener x) throws JSONException {

      final JSONArray ja = new JSONArray();

      for (;;) {

         final String value = getValue(x);

         if (value == null) {

            return null;

         }

         ja.put(value);

         for (;;) {

            final char c = x.next();

            if (c == ',') {

               break;

            }

            if (c != ' ') {

               if (c == '\n' || c == '\r' || c == 0) {

                  return ja;

               }

               throw x.syntaxError("Bad character '" + c + "' (" + (int) c + ").");

            }

         }

      }

   }

   /**

    * Produce a JSONObject from a row of comma delimited text, using a parallel JSONArray of strings to provides the names of the

    * elements.

    *

    * @param names

    *                A JSONArray of names. This is commonly obtained from the first row of a comma delimited text file using the

    *                rowToJSONArray method.

    * @param x

    *                A JSONTokener of the source text.

    * @return A JSONObject combining the names and values.

    * @throws JSONException

    */

   public static JSONObject rowToJSONObject(final JSONArray names,

                                            final JSONTokener x) throws JSONException {

      final JSONArray ja = rowToJSONArray(x);

      return ja != null ? ja.toJSONObject(names) : null;

   }

   /**

    * Produce a JSONArray of JSONObjects from a comma delimited text string, using the first row as a source of names.

    *

    * @param string

    *                The comma delimited text.

    * @return A JSONArray of JSONObjects.

    * @throws JSONException

    */

   public static JSONArray toJSONArray(final String string) throws JSONException {

      return toJSONArray(new JSONTokener(string));

   }

   /**

    * Produce a JSONArray of JSONObjects from a comma delimited text string, using the first row as a source of names.

    *

    * @param x

    *                The JSONTokener containing the comma delimited text.

    * @return A JSONArray of JSONObjects.

    * @throws JSONException

    */

   public static JSONArray toJSONArray(final JSONTokener x) throws JSONException {

      return toJSONArray(rowToJSONArray(x), x);

   }

   /**

    * Produce a JSONArray of JSONObjects from a comma delimited text string using a supplied JSONArray as the source of element

    * names.

    *

    * @param names

    *                A JSONArray of strings.

    * @param string

    *                The comma delimited text.

    * @return A JSONArray of JSONObjects.

    * @throws JSONException

    */

   public static JSONArray toJSONArray(final JSONArray names,

                                       final String string) throws JSONException {

      return toJSONArray(names, new JSONTokener(string));

   }

   /**

    * Produce a JSONArray of JSONObjects from a comma delimited text string using a supplied JSONArray as the source of element

    * names.

    *

    * @param names

    *                A JSONArray of strings.

    * @param x

    *                A JSONTokener of the source text.

    * @return A JSONArray of JSONObjects.

    * @throws JSONException

    */

   public static JSONArray toJSONArray(final JSONArray names,

                                       final JSONTokener x) throws JSONException {

      if (names == null || names.length() == 0) {

         return null;

      }

      final JSONArray ja = new JSONArray();

      for (;;) {

         final JSONObject jo = rowToJSONObject(names, x);

         if (jo == null) {

            break;

         }

         ja.put(jo);

      }

      if (ja.length() == 0) {

         return null;

      }

      return ja;

   }

   /**

    * Produce a comma delimited text row from a JSONArray. Values containing the comma character will be quoted.

    *

    * @param ja

    *                A JSONArray of strings.

    * @return A string ending in NEWLINE.

    */

   public static String rowToString(final JSONArray ja) {

      final StringBuffer sb = new StringBuffer();

      for (int i = 0; i < ja.length(); i += 1) {

         if (i > 0) {

            sb.append(',');

         }

         final Object o = ja.opt(i);

         if (o != null) {

            final String s = o.toString();

            if (s.indexOf(',') >= 0) {

               if (s.indexOf('"') >= 0) {

                  sb.append('\'');

                  sb.append(s);

                  sb.append('\'');

               }

               else {

                  sb.append('"');

                  sb.append(s);

                  sb.append('"');

               }

            }

            else {

               sb.append(s);

            }

         }

      }

      sb.append('\n');

      return sb.toString();

   }

   /**

    * Produce a comma delimited text from a JSONArray of JSONObjects. The first row will be a list of names obtained by inspecting

    * the first JSONObject.

    *

    * @param ja

    *                A JSONArray of JSONObjects.

    * @return A comma delimited text.

    * @throws JSONException

    */

   public static String toString(final JSONArray ja) throws JSONException {

      final JSONObject jo = ja.optJSONObject(0);

      if (jo != null) {

         final JSONArray names = jo.names();

         if (names != null) {

            return rowToString(names) + toString(names, ja);

         }

      }

      return null;

   }

   /**

    * Produce a comma delimited text from a JSONArray of JSONObjects using a provided list of names. The list of names is not

    * included in the output.

    *

    * @param names

    *                A JSONArray of strings.

    * @param ja

    *                A JSONArray of JSONObjects.

    * @return A comma delimited text.

    * @throws JSONException

    */

   public static String toString(final JSONArray names,

                                 final JSONArray ja) throws JSONException {

      if (names == null || names.length() == 0) {

         return null;

      }

      final StringBuffer sb = new StringBuffer();

      for (int i = 0; i < ja.length(); i += 1) {

         final JSONObject jo = ja.optJSONObject(i);

         if (jo != null) {

            sb.append(rowToString(jo.toJSONArray(names)));

         }

      }

      return sb.toString();

   }

}