/*
* Copyright 2002-2006 the original author or authors.
*
* 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 com.nfwork.dbfound.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( JSONTokener x )
{
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( JSONTokener x )
{
JSONArray ja = new JSONArray();
for( ;; ){
String value = getValue( x );
if( value == null ){
return null;
}
ja.put( value );
for( ;; ){
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( JSONArray names, JSONTokener x )
{
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( String string )
{
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( JSONTokener x )
{
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( JSONArray names, String string )
{
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( JSONArray names, JSONTokener x )
{
if( names == null || names.length() == 0 ){
return null;
}
JSONArray ja = new JSONArray();
for( ;; ){
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( JSONArray ja )
{
StringBuffer sb = new StringBuffer();
for( int i = 0; i < ja.length(); i += 1 ){
if( i > 0 ){
sb.append( ',' );
}
Object o = ja.opt( i );
if( o != null ){
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( JSONArray ja )
{
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
*/
public static String toString( JSONArray names, JSONArray ja )
{
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();
}
}