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348 lines (336 loc) · 11.2 KB
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/*
* File: CDL.java
* Author: JSON.org
*/
package org.json;
// TODO: Auto-generated Javadoc
/*
* 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 2010-12-24
*/
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(JSONTokener x) throws JSONException
{
char c;
char q;
StringBuffer sb;
do
{
c = x.next();
} while (c == ' ' || c == '\t');
switch (c)
{
case 0:
return null;
case '"':
case '\'':
q = c;
sb = new StringBuffer();
while(true)
{
c = x.next();
if (c == q)
{
break;
}
if (c == 0 || c == '\n' || c == '\r')
{
throw x.syntaxError("Missing close quote '" + q + "'.");
}
sb.append(c);
}
return sb.toString();
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
* Thrown when things are amiss.
*/
public static JSONArray rowToJSONArray(JSONTokener x) throws JSONException
{
JSONArray ja = new JSONArray();
while(true)
{
String value = getValue(x);
char c = x.next();
if (value == null
|| (ja.length() == 0 && value.length() == 0 && c != ','))
{
return null;
}
ja.put(value);
while(c != ',')
{
if (c != ' ')
{
if (c == '\n' || c == '\r' || c == 0)
{
return ja;
}
throw x.syntaxError("Bad character '" + c + "' (" + (int) c
+ ").");
}
c = x.next();
}
}
}
/**
* 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
* Thrown when things are amiss.
*/
public static JSONObject rowToJSONObject(JSONArray names, JSONTokener x)
throws JSONException
{
JSONArray ja = rowToJSONArray(x);
return ja != null ? ja.toJSONObject(names) : null;
}
/**
* Produce a comma delimited text row from a JSONArray. Values containing
* the comma character will be quoted. Troublesome characters may be
* removed.
*
* @param ja
* A JSONArray of strings.
* @return A string ending in NEWLINE.
*/
public static String rowToString(JSONArray ja)
{
StringBuffer sb = new StringBuffer();
for (int i = 0; i < ja.length(); i += 1)
{
if (i > 0)
{
sb.append(',');
}
Object object = ja.opt(i);
if (object != null)
{
String string = object.toString();
if (string.length() > 0
&& (string.indexOf(',') >= 0
|| string.indexOf('\n') >= 0
|| string.indexOf('\r') >= 0
|| string.indexOf(0) >= 0 || string.charAt(0) == '"'))
{
sb.append('"');
int length = string.length();
for (int j = 0; j < length; j += 1)
{
char c = string.charAt(j);
if (c >= ' ' && c != '"')
{
sb.append(c);
}
}
sb.append('"');
} else
{
sb.append(string);
}
}
}
sb.append('\n');
return sb.toString();
}
/**
* 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
* Thrown when things are amiss.
*/
public static JSONArray toJSONArray(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
* Thrown when things are amiss.
*/
public static JSONArray toJSONArray(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
* Thrown when things are amiss.
*/
public static JSONArray toJSONArray(JSONArray names, 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
* Thrown when things are amiss.
*/
public static JSONArray toJSONArray(JSONArray names, JSONTokener x)
throws JSONException
{
if (names == null || names.length() == 0)
{
return null;
}
JSONArray ja = new JSONArray();
JSONObject jo = rowToJSONObject(names, x);
while(jo != null)
{
ja.put(jo);
jo = rowToJSONObject(names, x);
}
if (ja.length() == 0)
{
return null;
}
return ja;
}
/**
* 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
* Thrown when things are amiss.
*/
public static String toString(JSONArray ja) throws JSONException
{
JSONObject jo = ja.optJSONObject(0);
if (jo != null)
{
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
* Thrown when things are amiss.
*/
public static String toString(JSONArray names, JSONArray ja)
throws JSONException
{
if (names == null || names.length() == 0)
{
return null;
}
StringBuffer sb = new StringBuffer();
for (int i = 0; i < ja.length(); i += 1)
{
JSONObject jo = ja.optJSONObject(i);
if (jo != null)
{
sb.append(rowToString(jo.toJSONArray(names)));
}
}
return sb.toString();
}
}