org.openmdx.base.json.stream.JSONObject Maven / Gradle / Ivy
/*
* ====================================================================
* Project: openMDX/Core, http://www.openmdx.org/
* Description: JSONObject
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2014, OMEX AG, Switzerland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the openMDX team nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ------------------
*
* Copyright 2006 Envoi Solutions LLC
*
* 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 org.openmdx.base.json.stream;
import java.io.IOException;
import java.io.Serializable;
import java.io.Writer;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
/**
* A JSONObject is an unordered collection of name/value pairs. Its
* external form is a string wrapped in curly braces with colons between the
* names and values, and commas between the values and names. The internal form
* is an object having get and opt methods for
* accessing the values by name, and put methods for adding or
* replacing values by name. The values can be any of these types:
* Boolean, JSONArray, JSONObject,
* Number, String, or the JSONObject.NULL
* object. A JSONObject constructor can be used to convert an external form
* JSON text into an internal form whose values can be retrieved with the
* get and opt methods, or to convert values into a
* JSON text using the put and toString methods.
* A get method returns a value if one can be found, and throws an
* exception if one cannot be found. An opt method returns a
* default value instead of throwing an exception, and so is useful for
* obtaining optional values.
*
* The generic get() and opt() methods return an
* object, which you can cast or query for type. There are also typed
* get and opt methods that do type checking and type
* coersion for you.
*
* The put methods adds values to an object. For example,
* myString = new JSONObject().put("JSON", "Hello, World!").toString();
* produces the string {"JSON": "Hello, World"}.
*
* The texts produced by the toString methods strictly conform to
* the JSON sysntax rules.
* The constructors are more forgiving in the texts they will accept:
*
* - An extra
, (comma) may appear just
* before the closing brace.
* - Strings may be quoted with
' (single
* quote).
* - Strings do not need to be quoted at all if they do not begin with a quote
* or single quote, and if they do not contain leading or trailing spaces,
* and if they do not contain any of these characters:
*
{ } [ ] / \ : , = ; # and if they do not look like numbers
* and if they are not the reserved words true,
* false, or null.
* - Keys can be followed by
= or => as well as
* by :.
* - Values can be followed by
; (semicolon) as
* well as by , (comma).
* - Numbers may have the
0- (octal) or
* 0x- (hex) prefix.
* - Comments written in the slashshlash, slashstar, and hash conventions
* will be ignored.
*
* @author JSON.org
* @version 2
*/
@SuppressWarnings("serial")
public class JSONObject implements Serializable {
/**
* JSONObject.NULL is equivalent to the value that JavaScript calls null,
* whilst Java's null is equivalent to the value that JavaScript calls
* undefined.
*/
private static final class Null {
/**
* There is only intended to be a single instance of the NULL object,
* so the clone method returns itself.
* @return NULL.
*/
protected final Object clone() {
return this;
}
/**
* A Null object is equal to the null value and to itself.
* @param object An object to test for nullness.
* @return true if the object parameter is the JSONObject.NULL object
* or null.
*/
public boolean equals(Object object) {
return object == null || object == this;
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return 0;
}
/**
* Get the "null" string value.
* @return The string "null".
*/
public String toString() {
return "null";
}
}
/**
* The hash map where the JSONObject's properties are kept.
*/
private LinkedHashMap myHashMap;
/**
* It is sometimes more convenient and less ambiguous to have a
* NULL object than to use Java's null value.
* JSONObject.NULL.equals(null) returns true.
* JSONObject.NULL.toString() returns "null".
*/
public static final Object NULL = new Null();
/**
* Construct an empty JSONObject.
*/
public JSONObject() {
this.myHashMap = new LinkedHashMap();
}
/**
* Construct a JSONObject from a subset of another JSONObject.
* An array of strings is used to identify the keys that should be copied.
* Missing keys are ignored.
* @param jo A JSONObject.
* @param sa An array of strings.
* @exception JSONException If a value is a non-finite number.
*/
public JSONObject(JSONObject jo, String[] sa) throws JSONException {
this();
for (int i = 0; i < sa.length; i += 1) {
putOpt(sa[i], jo.opt(sa[i]));
}
}
/**
* Construct a JSONObject from a JSONTokener.
* @param x A JSONTokener object containing the source string.
* @throws JSONException If there is a syntax error in the source string.
*/
public JSONObject(JSONTokener x) throws JSONException {
this();
char c;
String key;
if (x.nextClean() != '{') {
throw x.syntaxError("A JSONObject text must begin with '{'");
}
for (;;) {
c = x.nextClean();
switch (c) {
case 0:
throw x.syntaxError("A JSONObject text must end with '}'");
case '}':
return;
default:
x.back();
key = x.nextValue().toString();
}
/*
* The key is followed by ':'. We will also tolerate '=' or '=>'.
*/
c = x.nextClean();
if (c == '=') {
if (x.next() != '>') {
x.back();
}
} else if (c != ':') {
throw x.syntaxError("Expected a ':' after a key");
}
doPut(key, x.nextValue(), x.getThreshold(), true);
/*
* Pairs are separated by ','. We will also tolerate ';'.
*/
switch (x.nextClean()) {
case ';':
case ',':
if (x.nextClean() == '}') {
return;
}
x.back();
break;
case '}':
return;
default:
throw x.syntaxError("Expected a ',' or '}'");
}
}
}
/**
* Construct a JSONObject from a Map.
* @param map A map object that can be used to initialize the contents of
* the JSONObject.
*/
@SuppressWarnings("unchecked")
public JSONObject(Map map) {
this.myHashMap = (map == null) ?
new LinkedHashMap() :
new LinkedHashMap(map);
// ensure a pure hierarchy of JSONObjects and JSONArrays
for (String k : myHashMap.keySet()) {
Object v = myHashMap.get(k);
if (v instanceof Collection) {
myHashMap.put(k, new JSONArray((Collection) v));
}
if (v instanceof Map) {
myHashMap.put(k, new JSONObject((Map) v));
}
}
}
/**
* Construct a JSONObject from an Object, using reflection to find the
* public members. The resulting JSONObject's keys will be the strings
* from the names array, and the values will be the field values associated
* with those keys in the object. If a key is not found or not visible,
* then it will not be copied into the new JSONObject.
* @param object An object that has fields that should be used to make a
* JSONObject.
* @param names An array of strings, the names of the fields to be used
* from the object.
*/
public JSONObject(Object object, String names[]) {
this();
Class c = object.getClass();
for (int i = 0; i < names.length; i += 1) {
try {
String name = names[i];
Field field = c.getField(name);
Object value = field.get(object);
this.put(name, value);
} catch (Exception e) {
/* forget about it */
}
}
}
/**
* Construct a JSONObject from a string.
* This is the most commonly used JSONObject constructor.
* @param string A string beginning
* with { (left brace) and ending
* with } (right brace).
* @exception JSONException If there is a syntax error in the source string.
*/
public JSONObject(String string) throws JSONException {
this(new JSONTokener(string));
}
/**
* Accumulate values under a key. It is similar to the put method except
* that if there is already an object stored under the key then a
* JSONArray is stored under the key to hold all of the accumulated values.
* If there is already a JSONArray, then the new value is appended to it.
* In contrast, the put method replaces the previous value.
* @param key A key string.
* @param value An object to be accumulated under the key.
* @return this.
* @throws JSONException If the value is an invalid number
* or if the key is null.
*/
public JSONObject accumulate(String key, Object value)
throws JSONException {
testValidity(value);
Object o = opt(key);
if (o == null) {
put(key, value);
} else if (o instanceof JSONArray) {
((JSONArray)o).put(value);
} else {
put(key, new JSONArray().put(o).put(value));
}
return this;
}
/**
* Append values to the array under a key. If the key does not exist in the
* JSONObject, then the key is put in the JSONObject with its value being a
* JSONArray containing the value parameter. If the key was already
* associated with a JSONArray, then the value parameter is appended to it.
* @param key A key string.
* @param value An object to be accumulated under the key.
* @return this.
* @throws JSONException If the key is null or if the current value
* associated with the key is not a JSONArray.
*/
public JSONObject append(String key, Object value)
throws JSONException {
testValidity(value);
Object o = opt(key);
if (o == null) {
put(key, new JSONArray().put(value));
} else if (!(o instanceof JSONArray)){
throw new JSONException("JSONObject[" + key +
"] is not a JSONArray.");
} else {
put(key, new JSONArray().put(o).put(value));
}
return this;
}
/**
* Produce a string from a double. The string "null" will be returned if
* the number is not finite.
* @param d A double.
* @return A String.
*/
static public String doubleToString(double d) {
if (Double.isInfinite(d) || Double.isNaN(d)) {
return "null";
}
// Shave off trailing zeros and decimal point, if possible.
String s = Double.toString(d);
if (s.indexOf('.') > 0 && s.indexOf('e') < 0 && s.indexOf('E') < 0) {
while (s.endsWith("0")) {
s = s.substring(0, s.length() - 1);
}
if (s.endsWith(".")) {
s = s.substring(0, s.length() - 1);
}
}
return s;
}
/**
* Get the value object associated with a key.
*
* @param key A key string.
* @return The object associated with the key.
* @throws JSONException if the key is not found.
*/
public Object get(String key) throws JSONException {
Object o = opt(key);
if (o == null) {
throw new JSONException("JSONObject[" + quote(key) +
"] not found.");
}
return o;
}
/**
* Get the boolean value associated with a key.
*
* @param key A key string.
* @return The truth.
* @throws JSONException
* if the value is not a Boolean or the String "true" or "false".
*/
public boolean getBoolean(String key) throws JSONException {
Object o = get(key);
if (o.equals(Boolean.FALSE) ||
(o instanceof String &&
((String)o).equalsIgnoreCase("false"))) {
return false;
} else if (o.equals(Boolean.TRUE) ||
(o instanceof String &&
((String)o).equalsIgnoreCase("true"))) {
return true;
}
throw new JSONException("JSONObject[" + quote(key) +
"] is not a Boolean.");
}
/**
* Get the double value associated with a key.
* @param key A key string.
* @return The numeric value.
* @throws JSONException if the key is not found or
* if the value is not a Number object and cannot be converted to a number.
*/
public double getDouble(String key) throws JSONException {
Object o = get(key);
try {
return o instanceof Number ?
((Number)o).doubleValue() :
Double.valueOf((String)o).doubleValue();
} catch (Exception e) {
throw new JSONException("JSONObject[" + quote(key) +
"] is not a number.");
}
}
/**
* Get the int value associated with a key. If the number value is too
* large for an int, it will be clipped.
*
* @param key A key string.
* @return The integer value.
* @throws JSONException if the key is not found or if the value cannot
* be converted to an integer.
*/
public int getInt(String key) throws JSONException {
Object o = get(key);
return o instanceof Number ?
((Number)o).intValue() : (int)getDouble(key);
}
/**
* Get the JSONArray value associated with a key.
*
* @param key A key string.
* @return A JSONArray which is the value.
* @throws JSONException if the key is not found or
* if the value is not a JSONArray.
*/
public JSONArray getJSONArray(String key) throws JSONException {
Object o = get(key);
if (o instanceof JSONArray) {
return (JSONArray)o;
}
throw new JSONException("JSONObject[" + quote(key) +
"] is not a JSONArray.");
}
/**
* Get the JSONObject value associated with a key.
*
* @param key A key string.
* @return A JSONObject which is the value.
* @throws JSONException if the key is not found or
* if the value is not a JSONObject.
*/
public JSONObject getJSONObject(String key) throws JSONException {
Object o = get(key);
if (o instanceof JSONObject) {
return (JSONObject)o;
}
throw new JSONException("JSONObject[" + quote(key) +
"] is not a JSONObject.");
}
/**
* Get the long value associated with a key. If the number value is too
* long for a long, it will be clipped.
*
* @param key A key string.
* @return The long value.
* @throws JSONException if the key is not found or if the value cannot
* be converted to a long.
*/
public long getLong(String key) throws JSONException {
Object o = get(key);
return o instanceof Number ?
((Number)o).longValue() : (long)getDouble(key);
}
/**
* Get the string associated with a key.
*
* @param key A key string.
* @return A string which is the value.
* @throws JSONException if the key is not found.
*/
public String getString(String key) throws JSONException {
return get(key).toString();
}
/**
* Determine if the JSONObject contains a specific key.
* @param key A key string.
* @return true if the key exists in the JSONObject.
*/
public boolean has(String key) {
return this.myHashMap.containsKey(key);
}
/**
* Determine if the value associated with the key is null or if there is
* no value.
* @param key A key string.
* @return true if there is no value associated with the key or if
* the value is the JSONObject.NULL object.
*/
public boolean isNull(String key) {
return JSONObject.NULL.equals(opt(key));
}
/**
* Get an enumeration of the keys of the JSONObject.
*
* @return An iterator of the keys.
*/
public Iterator keys() {
return this.myHashMap.keySet().iterator();
}
/**
* Get keys of the JSONObject.
*
* @return
*/
public Set keySet() {
return this.myHashMap.keySet();
}
/**
* Get the number of keys stored in the JSONObject.
*
* @return The number of keys in the JSONObject.
*/
public int length() {
return this.myHashMap.size();
}
/**
* Produce a JSONArray containing the names of the elements of this
* JSONObject.
* @return A JSONArray containing the key strings, or null if the JSONObject
* is empty.
*/
public JSONArray names() {
JSONArray ja = new JSONArray();
Iterator keys = keys();
while (keys.hasNext()) {
ja.put(keys.next());
}
return ja.length() == 0 ? null : ja;
}
/**
* Produce a string from a Number.
* @param n A Number
* @return A String.
* @throws JSONException If n is a non-finite number.
*/
static public String numberToString(Number n)
throws JSONException {
if (n == null) {
throw new JSONException("Null pointer");
}
testValidity(n);
// Shave off trailing zeros and decimal point, if possible.
String s = n.toString();
if (s.indexOf('.') > 0 && s.indexOf('e') < 0 && s.indexOf('E') < 0) {
while (s.endsWith("0")) {
s = s.substring(0, s.length() - 1);
}
if (s.endsWith(".")) {
s = s.substring(0, s.length() - 1);
}
}
return s;
}
/**
* Get an optional value associated with a key.
* @param key A key string.
* @return An object which is the value, or null if there is no value.
*/
public Object opt(String key) {
return key == null ? null : this.myHashMap.get(key);
}
/**
* Get an optional boolean associated with a key.
* It returns false if there is no such key, or if the value is not
* Boolean.TRUE or the String "true".
*
* @param key A key string.
* @return The truth.
*/
public boolean optBoolean(String key) {
return optBoolean(key, false);
}
/**
* Get an optional boolean associated with a key.
* It returns the defaultValue if there is no such key, or if it is not
* a Boolean or the String "true" or "false" (case insensitive).
*
* @param key A key string.
* @param defaultValue The default.
* @return The truth.
*/
public boolean optBoolean(String key, boolean defaultValue) {
try {
return getBoolean(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Put a key/value pair in the JSONObject, where the value will be a
* JSONArray which is produced from a Collection.
* @param key A key string.
* @param value A Collection value.
* @return this.
* @throws JSONException
*/
public JSONObject put(String key, Collection value) throws JSONException {
put(key, new JSONArray(value));
return this;
}
/**
* Get an optional double associated with a key,
* or NaN if there is no such key or if its value is not a number.
* If the value is a string, an attempt will be made to evaluate it as
* a number.
*
* @param key A string which is the key.
* @return An object which is the value.
*/
public double optDouble(String key) {
return optDouble(key, Double.NaN);
}
/**
* Get an optional double associated with a key, or the
* defaultValue if there is no such key or if its value is not a number.
* If the value is a string, an attempt will be made to evaluate it as
* a number.
*
* @param key A key string.
* @param defaultValue The default.
* @return An object which is the value.
*/
public double optDouble(String key, double defaultValue) {
try {
Object o = opt(key);
return o instanceof Number ? ((Number)o).doubleValue() :
new Double((String)o).doubleValue();
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get an optional int value associated with a key,
* or zero if there is no such key or if the value is not a number.
* If the value is a string, an attempt will be made to evaluate it as
* a number.
*
* @param key A key string.
* @return An object which is the value.
*/
public int optInt(String key) {
return optInt(key, 0);
}
/**
* Get an optional int value associated with a key,
* or the default if there is no such key or if the value is not a number.
* If the value is a string, an attempt will be made to evaluate it as
* a number.
*
* @param key A key string.
* @param defaultValue The default.
* @return An object which is the value.
*/
public int optInt(String key, int defaultValue) {
try {
return getInt(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get an optional JSONArray associated with a key.
* It returns null if there is no such key, or if its value is not a
* JSONArray.
*
* @param key A key string.
* @return A JSONArray which is the value.
*/
public JSONArray optJSONArray(String key) {
Object o = opt(key);
return o instanceof JSONArray ? (JSONArray)o : null;
}
/**
* Get an optional JSONObject associated with a key.
* It returns null if there is no such key, or if its value is not a
* JSONObject.
*
* @param key A key string.
* @return A JSONObject which is the value.
*/
public JSONObject optJSONObject(String key) {
Object o = opt(key);
return o instanceof JSONObject ? (JSONObject)o : null;
}
/**
* Get an optional long value associated with a key,
* or zero if there is no such key or if the value is not a number.
* If the value is a string, an attempt will be made to evaluate it as
* a number.
*
* @param key A key string.
* @return An object which is the value.
*/
public long optLong(String key) {
return optLong(key, 0);
}
/**
* Get an optional long value associated with a key,
* or the default if there is no such key or if the value is not a number.
* If the value is a string, an attempt will be made to evaluate it as
* a number.
*
* @param key A key string.
* @param defaultValue The default.
* @return An object which is the value.
*/
public long optLong(String key, long defaultValue) {
try {
return getLong(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get an optional string associated with a key.
* It returns an empty string if there is no such key. If the value is not
* a string and is not null, then it is coverted to a string.
*
* @param key A key string.
* @return A string which is the value.
*/
public String optString(String key) {
return optString(key, "");
}
/**
* Get an optional string associated with a key.
* It returns the defaultValue if there is no such key.
*
* @param key A key string.
* @param defaultValue The default.
* @return A string which is the value.
*/
public String optString(String key, String defaultValue) {
Object o = opt(key);
return o != null ? o.toString() : defaultValue;
}
/**
* Put a key/boolean pair in the JSONObject.
*
* @param key A key string.
* @param value A boolean which is the value.
* @return this.
* @throws JSONException If the key is null.
*/
public JSONObject put(String key, boolean value) throws JSONException {
put(key, value ? Boolean.TRUE : Boolean.FALSE);
return this;
}
/**
* Put a key/double pair in the JSONObject.
*
* @param key A key string.
* @param value A double which is the value.
* @return this.
* @throws JSONException If the key is null or if the number is invalid.
*/
public JSONObject put(String key, double value) throws JSONException {
put(key, new Double(value));
return this;
}
/**
* Put a key/int pair in the JSONObject.
*
* @param key A key string.
* @param value An int which is the value.
* @return this.
* @throws JSONException If the key is null.
*/
public JSONObject put(String key, int value) throws JSONException {
put(key, Integer.valueOf(value));
return this;
}
/**
* Put a key/long pair in the JSONObject.
*
* @param key A key string.
* @param value A long which is the value.
* @return this.
* @throws JSONException If the key is null.
*/
public JSONObject put(String key, long value) throws JSONException {
put(key, new Long(value));
return this;
}
/**
* Put a key/value pair in the JSONObject, where the value will be a
* JSONObject which is produced from a Map.
* @param key A key string.
* @param value A Map value.
* @return this.
* @throws JSONException
*/
public JSONObject put(String key, Map value) throws JSONException {
put(key, new JSONObject(value));
return this;
}
/**
* Put a key/value pair in the JSONObject. If the value is null,
* then the key will be removed from the JSONObject if it is present.
* @param key A key string.
* @param value An object which is the value. It should be of one of these
* types: Boolean, Double, Integer, JSONArray, JSONObject, Long, String,
* or the JSONObject.NULL object.
* @return this.
* @throws JSONException If the value is non-finite number
* or if the key is null.
*/
public JSONObject put(String key, Object value) throws JSONException {
return doPut(key, value, -1, false);
}
protected JSONObject doPut(String key,
Object value,
int threshold,
boolean checkExistingValue)
throws JSONException {
if (key == null) {
throw new JSONException("Null key.");
}
testValidity(value);
if (!checkExistingValue || !this.myHashMap.containsKey(key)) {
this.myHashMap.put(key, value);
if (threshold > 0 && myHashMap.size() >= threshold) {
throw new JSONSequenceTooLargeException("Threshold has been exceeded");
}
} else {
JSONArray array = null;
Object existingValue = this.myHashMap.get(key);
if (existingValue instanceof JSONArray) {
array = ((JSONArray)existingValue);
} else {
array = new JSONArray(Collections.singletonList(existingValue));
this.myHashMap.put(key, array);
}
array.put(value);
}
return this;
}
/**
* Put a key/value pair in the JSONObject, but only if the
* key and the value are both non-null.
* @param key A key string.
* @param value An object which is the value. It should be of one of these
* types: Boolean, Double, Integer, JSONArray, JSONObject, Long, String,
* or the JSONObject.NULL object.
* @return this.
* @throws JSONException If the value is a non-finite number.
*/
public JSONObject putOpt(String key, Object value) throws JSONException {
if (key != null && value != null) {
put(key, value);
}
return this;
}
/**
* Produce a string in double quotes with backslash sequences in all the
* right places. A backslash will be inserted within
* Warning: This method assumes that the data structure is acyclical.
*
* @return a printable, displayable, portable, transmittable
* representation of the object, beginning
* with { (left brace) and ending
* with } (right brace).
*/
public String toString() {
try {
Iterator keys = keys();
StringBuilder sb = new StringBuilder("{");
while (keys.hasNext()) {
if (sb.length() > 1) {
sb.append(',');
}
Object o = keys.next();
sb.append(quote(o.toString()));
sb.append(':');
sb.append(valueToString(this.myHashMap.get(o)));
}
sb.append('}');
return sb.toString();
} catch (Exception e) {
return null;
}
}
/**
* Make a prettyprinted JSON text of this JSONObject.
*
* Warning: This method assumes that the data structure is acyclical.
* @param indentFactor The number of spaces to add to each level of
* indentation.
* @return a printable, displayable, portable, transmittable
* representation of the object, beginning
* with { (left brace) and ending
* with } (right brace).
* @throws JSONException If the object contains an invalid number.
*/
public String toString(int indentFactor) throws JSONException {
return toString(indentFactor, 0);
}
/**
* Make a prettyprinted JSON text of this JSONObject.
*
* Warning: This method assumes that the data structure is acyclical.
* @param indentFactor The number of spaces to add to each level of
* indentation.
* @param indent The indentation of the top level.
* @return a printable, displayable, transmittable
* representation of the object, beginning
* with { (left brace) and ending
* with } (right brace).
* @throws JSONException If the object contains an invalid number.
*/
String toString(int indentFactor, int indent) throws JSONException {
int i;
int n = length();
if (n == 0) {
return "{}";
}
Iterator keys = keys();
StringBuilder sb = new StringBuilder("{");
int newindent = indent + indentFactor;
Object o;
if (n == 1) {
o = keys.next();
sb.append(quote(o.toString()));
sb.append(": ");
sb.append(valueToString(this.myHashMap.get(o), indentFactor,
indent));
} else {
while (keys.hasNext()) {
o = keys.next();
if (sb.length() > 1) {
sb.append(",\n");
} else {
sb.append('\n');
}
for (i = 0; i < newindent; i += 1) {
sb.append(' ');
}
sb.append(quote(o.toString()));
sb.append(": ");
sb.append(valueToString(this.myHashMap.get(o), indentFactor,
newindent));
}
if (sb.length() > 1) {
sb.append('\n');
for (i = 0; i < indent; i += 1) {
sb.append(' ');
}
}
}
sb.append('}');
return sb.toString();
}
/**
* Make a JSON text of an Object value. If the object has an
* value.toJSONString() method, then that method will be used to produce
* the JSON text. The method is required to produce a strictly
* conforming text. If the object does not contain a toJSONString
* method (which is the most common case), then a text will be
* produced by the rules.
*
* Warning: This method assumes that the data structure is acyclical.
* @param value The value to be serialized.
* @return a printable, displayable, transmittable
* representation of the object, beginning
* with { (left brace) and ending
* with } (right brace).
* @throws JSONException If the value is or contains an invalid number.
*/
static String valueToString(Object value) throws JSONException {
if (isEquilvalentToNull(value)) {
return "null";
}
if (value instanceof JSONString) {
Object o;
try {
o = ((JSONString)value).toJSONString();
} catch (Exception e) {
throw new JSONException(e);
}
if (o instanceof String) {
return (String) o;
}
throw new JSONException("Bad value from toJSONString: " + o);
}
if (value instanceof Number) {
return numberToString((Number) value);
}
if (value instanceof Boolean || value instanceof JSONObject ||
value instanceof JSONArray) {
return value.toString();
}
return quote(value.toString());
}
private static boolean isEquilvalentToNull(Object value) {
return value == null || value.equals(null);
}
/**
* Make a prettyprinted JSON text of an object value.
*
* Warning: This method assumes that the data structure is acyclical.
* @param value The value to be serialized.
* @param indentFactor The number of spaces to add to each level of
* indentation.
* @param indent The indentation of the top level.
* @return a printable, displayable, transmittable
* representation of the object, beginning
* with { (left brace) and ending
* with } (right brace).
* @throws JSONException If the object contains an invalid number.
*/
static String valueToString(Object value, int indentFactor, int indent)
throws JSONException {
if (isEquilvalentToNull(value)) {
return "null";
}
try {
if (value instanceof JSONString) {
Object o = ((JSONString)value).toJSONString();
if (o instanceof String) {
return (String)o;
}
}
} catch (Exception e) {
/* forget about it */
}
if (value instanceof Number) {
return numberToString((Number) value);
}
if (value instanceof Boolean) {
return value.toString();
}
if (value instanceof JSONObject) {
return ((JSONObject)value).toString(indentFactor, indent);
}
if (value instanceof JSONArray) {
return ((JSONArray)value).toString(indentFactor, indent);
}
return quote(value.toString());
}
/**
* Write the contents of the JSONObject as JSON text to a writer.
* For compactness, no whitespace is added.
*
* Warning: This method assumes that the data structure is acyclical.
*
* @return The writer.
* @throws JSONException
*/
public Writer write(Writer writer) throws JSONException {
try {
boolean b = false;
Iterator keys = keys();
writer.write('{');
while (keys.hasNext()) {
if (b) {
writer.write(',');
}
Object k = keys.next();
writer.write(quote(k.toString()));
writer.write(':');
Object v = this.myHashMap.get(k);
if (v instanceof JSONObject) {
((JSONObject)v).write(writer);
} else if (v instanceof JSONArray) {
((JSONArray)v).write(writer);
} else {
writer.write(valueToString(v));
}
b = true;
}
writer.write('}');
return writer;
} catch (IOException e) {
throw new JSONException(e);
}
}
}