/*
* PhoneGap is available under *either* the terms of the modified BSD license *or* the
* MIT License (2008). See http://opensource.org/licenses/alphabetical for full text.
*
* Copyright (c) 2011, IBM Corporation
*/
package com.phonegap.json4j;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import com.phonegap.json4j.internal.JSON4JPBackReader;
/**
* Helper class that does generic parsing of a JSON stream and returns the appropriate
* JSON structure (JSONArray or JSONObject). Note that it is slightly more efficient to directly
* parse with the appropriate object than to use this class to do a generalized parse.
*/
public class JSON {
/**
* A constant for representing null.
* In this case, it is just null.
*/
public static final Object NULL = null;
/**
* Parse a Reader of JSON text into a JSONArtifact.
* @param reader The character reader to read the JSON data from.
* @param order Boolean flag indicating if the order of the JSON data should be preserved. This parameter only has an effect if the stream is JSON Object { ... } formatted data.
* Note: The provided reader is not closed on completion of read; that is left to the caller.
* Note: This is the same as calling parse(reader, order, false);
*
* @return Returns an instance of JSONArtifact (JSONObject, OrderedJSONObject, or JSONArray), corrisponding to if the input stream was Object or Array notation.
*
* @throws JSONException Thrown on errors during parse.
* @throws NullPointerException Thrown if reader is null
*/
public static JSONArtifact parse(Reader reader, boolean order) throws JSONException, NullPointerException {
return parse(reader,order,false);
}
/**
* Parse a Reader of JSON text into a JSONArtifact.
* @param reader The character reader to read the JSON data from.
* @param order Boolean flag indicating if the order of the JSON data should be preserved. This parameter only has an effect if the stream is JSON Object { ... } formatted data.
* @param strict Boolean flag to indicate if the content should be parsed in strict mode or not, meaning comments and unquoted strings are not allowed.
* Note: The provided reader is not closed on completion of read; that is left to the caller.
*
* @return Returns an instance of JSONArtifact (JSONObject, OrderedJSONObject, or JSONArray), corrisponding to if the input stream was Object or Array notation.
*
* @throws JSONException Thrown on errors during parse.
* @throws NullPointerException Thrown if reader is null
*/
public static JSONArtifact parse(Reader reader, boolean order, boolean strict) throws JSONException, NullPointerException {
try {
if (reader != null) {
JSON4JPBackReader pReader = null;
//Determine if we should buffer-wrap the reader before passing it on
//to the appropriate parser.
boolean bufferIt = false;
Class readerClass = reader.getClass();
/* if (!StringReader.class.isAssignableFrom(readerClass) &&
!CharArrayReader.class.isAssignableFrom(readerClass) &&
!PushbackReader.class.isAssignableFrom(readerClass) &&
!BufferedReader.class.isAssignableFrom(readerClass)) {
bufferIt = true;
} */
//MSN IMPLEMENT PUSHBACKREADER!!
if (JSON4JPBackReader.class.isAssignableFrom(readerClass)) {
pReader = (JSON4JPBackReader) reader;
} else {
pReader = new JSON4JPBackReader(reader);
}
Reader rdr = pReader;
int ch = pReader.read();
while (ch != -1) {
switch (ch) {
case '{':
pReader.unread(ch);
/* if (bufferIt) {
rdr = new BufferedReader(pReader);
} */
return new JSONObject(rdr,strict);
case '[':
pReader.unread(ch);
/*if (bufferIt) {
rdr = new BufferedReader(pReader);
} */
return new JSONArray(rdr, strict);
case ' ':
case '\t':
case '\f':
case '\r':
case '\n':
case '\b':
ch = pReader.read();
break;
default:
throw new JSONException("Unexpected character: [" + (char)ch + "] while scanning JSON String for JSON type. Invalid JSON.");
}
}
throw new JSONException("Encountered end of stream before JSON data was read. Invalid JSON");
} else {
throw new NullPointerException("reader cannot be null.");
}
} catch (IOException iox) {
JSONException jex = new JSONException("Error occurred during input read.");
jex.setCause(iox);
throw jex;
}
}
/**
* Parse a Reader of JSON text into a JSONArtifact.
* This call is the same as JSON.parse(reader, false, false).
* Note that the provided reader is not closed on completion of read; that is left to the caller.
* @param reader The character reader to read the JSON data from.
*
* @return Returns an instance of JSONArtifact (JSONObject, OrderedJSONObject, or JSONArray), corrisponding to if the input stream was Object or Array notation.
*
* @throws JSONException Thrown on errors during parse.
* @throws NullPointerException Thrown if reader is null
*/
public static JSONArtifact parse(Reader reader) throws JSONException, NullPointerException {
return parse(reader,false, false);
}
/**
* Parse a InputStream of JSON text into a JSONArtifact.
* Note: The provided InputStream is not closed on completion of read; that is left to the caller.
* @param is The input stream to read from. The content is assumed to be UTF-8 encoded and handled as such.
* @param order Boolean flag indicating if the order of the JSON data should be preserved. This parameter only has an effect if the stream is JSON Object { ... } formatted data.
*
* @return Returns an instance of JSONArtifact (JSONObject or JSONArray), corrisponding to if the input stream was Object or Array notation.
*
* @throws JSONException Thrown on errors during parse.
* @throws NullPointerException Thrown if reader is null
*/
public static JSONArtifact parse(InputStream is, boolean order) throws JSONException, NullPointerException {
return parse(is,order, false);
}
/**
* Parse a InputStream of JSON text into a JSONArtifact.
* Note that the provided InputStream is not closed on completion of read; that is left to the caller.
* @param is The input stream to read from. The content is assumed to be UTF-8 encoded and handled as such.
* @param order Boolean flag indicating if the order of the JSON data should be preserved. This parameter only has an effect if the stream is JSON Object { ... } formatted data.
* @param strict Boolean flag to indicate if the content should be parsed in strict mode or not, meaning comments and unquoted strings are not allowed.
*
* @return Returns an instance of JSONArtifact (JSONObject or JSONArray), corrisponding to if the input stream was Object or Array notation.
*
* @throws JSONException Thrown on errors during parse.
* @throws NullPointerException Thrown if reader is null
*/
public static JSONArtifact parse(InputStream is, boolean order, boolean strict) throws JSONException, NullPointerException {
if (is != null) {
//BufferedReader reader = null;
InputStreamReader reader = null;
try {
reader = new InputStreamReader(is, "UTF-8");
} catch (Exception ex) {
JSONException iox = new JSONException("Could not construct UTF-8 character reader for the InputStream");
iox.setCause(ex);
throw iox;
}
return parse(reader,order);
} else {
throw new NullPointerException("is cannot be null");
}
}
/**
* Parse an InputStream of JSON text into a JSONArtifact.
* This call is the same as JSON.parse(is, false, false).
* Note that the provided InputStream is not closed on completion of read; that is left to the caller.
* @param is The input stream to read from. The content is assumed to be UTF-8 encoded and handled as such.
*
* @return Returns an instance of JSONArtifact (JSONObject, OrderedJSONObject, or JSONArray), corrisponding to if the input stream was Object or Array notation.
*
* @throws JSONException Thrown on errors during parse.
* @throws NullPointerException Thrown if reader is null
*/
public static JSONArtifact parse(InputStream is) throws JSONException, NullPointerException {
return parse(is,false, false);
}
}