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‎CDL.java‎

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package org.json;
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/*
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Copyright (c) 2002 JSON.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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The Software shall be used for Good, not Evil.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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/**
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* This provides static methods to convert comma delimited text into a
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* JSONArray, and to covert a JSONArray into comma delimited text. Comma
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* delimited text is a very popular format for data interchange. It is
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* understood by most database, spreadsheet, and organizer programs.
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* <p>
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* Each row of text represents a row in a table or a data record. Each row
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* ends with a NEWLINE character. Each row contains one or more values.
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* Values are separated by commas. A value can contain any character except
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* for comma, unless is is wrapped in single quotes or double quotes.
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* <p>
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* The first row usually contains the names of the columns.
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* <p>
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* A comma delimited list can be converted into a JSONArray of JSONObjects.
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* The names for the elements in the JSONObjects can be taken from the names
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* in the first row.
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* @author JSON.org
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* @version 2009-09-11
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*/
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public class CDL {
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/**
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* Get the next value. The value can be wrapped in quotes. The value can
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* be empty.
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* @param x A JSONTokener of the source text.
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* @return The value string, or null if empty.
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* @throws JSONException if the quoted string is badly formed.
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*/
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private static String getValue(JSONTokener x) throws JSONException {
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char c;
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char q;
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StringBuffer sb;
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do {
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c = x.next();
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} while (c == ' ' || c == '\t');
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switch (c) {
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case 0:
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return null;
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case '"':
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case '\'':
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q = c;
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sb = new StringBuffer();
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for (;;) {
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c = x.next();
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if (c == q) {
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break;
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}
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if (c == 0 || c == '\n' || c == '\r') {
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throw x.syntaxError("Missing close quote '" + q + "'.");
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}
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sb.append(c);
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}
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return sb.toString();
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case ',':
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x.back();
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return "";
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default:
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x.back();
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return x.nextTo(',');
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}
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}
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/**
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* Produce a JSONArray of strings from a row of comma delimited values.
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* @param x A JSONTokener of the source text.
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* @return A JSONArray of strings.
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* @throws JSONException
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*/
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public static JSONArray rowToJSONArray(JSONTokener x) throws JSONException {
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JSONArray ja = new JSONArray();
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for (;;) {
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String value = getValue(x);
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char c = x.next();
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if (value == null ||
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(ja.length() == 0 && value.length() == 0 && c != ',')) {
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return null;
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}
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ja.put(value);
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for (;;) {
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if (c == ',') {
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break;
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}
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if (c != ' ') {
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if (c == '\n' || c == '\r' || c == 0) {
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return ja;
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}
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throw x.syntaxError("Bad character '" + c + "' (" +
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(int)c + ").");
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}
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c = x.next();
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}
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}
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}
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/**
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* Produce a JSONObject from a row of comma delimited text, using a
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* parallel JSONArray of strings to provides the names of the elements.
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* @param names A JSONArray of names. This is commonly obtained from the
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* first row of a comma delimited text file using the rowToJSONArray
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* method.
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* @param x A JSONTokener of the source text.
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* @return A JSONObject combining the names and values.
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* @throws JSONException
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*/
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public static JSONObject rowToJSONObject(JSONArray names, JSONTokener x)
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throws JSONException {
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JSONArray ja = rowToJSONArray(x);
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return ja != null ? ja.toJSONObject(names) : null;
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}
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/**
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* Produce a JSONArray of JSONObjects from a comma delimited text string,
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* using the first row as a source of names.
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* @param string The comma delimited text.
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* @return A JSONArray of JSONObjects.
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* @throws JSONException
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*/
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public static JSONArray toJSONArray(String string) throws JSONException {
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return toJSONArray(new JSONTokener(string));
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}
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/**
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* Produce a JSONArray of JSONObjects from a comma delimited text string,
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* using the first row as a source of names.
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* @param x The JSONTokener containing the comma delimited text.
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* @return A JSONArray of JSONObjects.
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* @throws JSONException
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*/
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public static JSONArray toJSONArray(JSONTokener x) throws JSONException {
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return toJSONArray(rowToJSONArray(x), x);
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}
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/**
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* Produce a JSONArray of JSONObjects from a comma delimited text string
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* using a supplied JSONArray as the source of element names.
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* @param names A JSONArray of strings.
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* @param string The comma delimited text.
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* @return A JSONArray of JSONObjects.
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* @throws JSONException
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*/
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public static JSONArray toJSONArray(JSONArray names, String string)
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throws JSONException {
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return toJSONArray(names, new JSONTokener(string));
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}
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/**
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* Produce a JSONArray of JSONObjects from a comma delimited text string
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* using a supplied JSONArray as the source of element names.
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* @param names A JSONArray of strings.
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* @param x A JSONTokener of the source text.
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* @return A JSONArray of JSONObjects.
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* @throws JSONException
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*/
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public static JSONArray toJSONArray(JSONArray names, JSONTokener x)
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throws JSONException {
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if (names == null || names.length() == 0) {
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return null;
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}
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JSONArray ja = new JSONArray();
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for (;;) {
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JSONObject jo = rowToJSONObject(names, x);
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if (jo == null) {
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break;
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}
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ja.put(jo);
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}
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if (ja.length() == 0) {
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return null;
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}
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return ja;
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}
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/**
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* Produce a comma delimited text row from a JSONArray. Values containing
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* the comma character will be quoted. Troublesome characters may be
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* removed.
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* @param ja A JSONArray of strings.
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* @return A string ending in NEWLINE.
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*/
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public static String rowToString(JSONArray ja) {
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < ja.length(); i += 1) {
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if (i > 0) {
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sb.append(',');
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}
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Object o = ja.opt(i);
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if (o != null) {
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String s = o.toString();
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if (s.length() > 0 && (s.indexOf(',') >= 0 || s.indexOf('\n') >= 0 ||
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s.indexOf('\r') >= 0 || s.indexOf(0) >= 0 ||
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s.charAt(0) == '"')) {
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sb.append('"');
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int length = s.length();
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for (int j = 0; j < length; j += 1) {
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char c = s.charAt(j);
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if (c >= ' ' && c != '"') {
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sb.append(c);
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}
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}
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sb.append('"');
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} else {
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sb.append(s);
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}
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}
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}
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sb.append('\n');
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return sb.toString();
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}
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/**
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* Produce a comma delimited text from a JSONArray of JSONObjects. The
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* first row will be a list of names obtained by inspecting the first
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* JSONObject.
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* @param ja A JSONArray of JSONObjects.
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* @return A comma delimited text.
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* @throws JSONException
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*/
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public static String toString(JSONArray ja) throws JSONException {
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JSONObject jo = ja.optJSONObject(0);
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if (jo != null) {
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JSONArray names = jo.names();
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if (names != null) {
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return rowToString(names) + toString(names, ja);
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}
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}
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return null;
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}
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/**
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* Produce a comma delimited text from a JSONArray of JSONObjects using
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* a provided list of names. The list of names is not included in the
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* output.
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* @param names A JSONArray of strings.
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* @param ja A JSONArray of JSONObjects.
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* @return A comma delimited text.
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* @throws JSONException
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*/
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public static String toString(JSONArray names, JSONArray ja)
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throws JSONException {
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if (names == null || names.length() == 0) {
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return null;
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}
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < ja.length(); i += 1) {
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JSONObject jo = ja.optJSONObject(i);
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if (jo != null) {
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sb.append(rowToString(jo.toJSONArray(names)));
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}
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}
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return sb.toString();
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}
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}

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