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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
* coercion for you. The opt methods differ from the get methods in that they
* do not throw. Instead, they return a specified value, such as null.
*
* The put methods add or replace values in 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 syntax rules. The constructors are more forgiving in the texts they
* will accept:
*
, (comma) may appear just
* before the closing brace.' (single
* quote).{ } [ ] / \ : , # and if they do not look like numbers and
* if they are not the reserved words true, false,
* or null.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() {
// HashMap is used on purpose to ensure that elements are unordered by
// the specification.
// JSON tends to be a portable transfer format to allows the container
// implementations to rearrange their items for a faster element
// retrieval based on associative access.
// Therefore, an implementation mustn't rely on the order of the item.
this.map = new HashMap();
}
/**
* 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 names
* An array of strings.
*/
public JSONObject(JSONObject jo, String[] names) {
this(names.length);
for (int i = 0; i < names.length; i += 1) {
try {
this.putOnce(names[i], jo.opt(names[i]));
} catch (Exception ignore) {
}
}
}
/**
* 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 or a
* duplicated key.
*/
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 ':'.
c = x.nextClean();
if (c != ':') {
throw x.syntaxError("Expected a ':' after a key");
}
// Use syntaxError(..) to include error location
if (key != null) {
// Check if key exists
if (this.opt(key) != null) {
// key already exists
throw x.syntaxError("Duplicate key \"" + key + "\"");
}
// Only add value if non-null
Object value = x.nextValue();
if (value!=null) {
this.put(key, value);
}
}
// Pairs are separated by ','.
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 m
* A map object that can be used to initialize the contents of
* the JSONObject.
* @throws JSONException
* If a value in the map is non-finite number.
* @throws NullPointerException
* If a key in the map is null
*/
public JSONObject(Map m) {
if (m == null) {
this.map = new HashMap();
} else {
this.map = new HashMap(m.size());
for (final Entry e : m.entrySet()) {
if(e.getKey() == null) {
throw new NullPointerException("Null key.");
}
final Object value = e.getValue();
if (value != null) {
this.map.put(String.valueOf(e.getKey()), wrap(value));
}
}
}
}
/**
* Construct a JSONObject from an Object using bean getters. It reflects on
* all of the public methods of the object. For each of the methods with no
* parameters and a name starting with "get" or
* "is" followed by an uppercase letter, the method is invoked,
* and a key and the value returned from the getter method are put into the
* new JSONObject.
*
* The key is formed by removing the "get" or "is"
* prefix. If the second remaining character is not upper case, then the
* first character is converted to lower case.
*
* Methods that are static, return void,
* have parameters, or are "bridge" methods, are ignored.
*
* For example, if an object has a method named "getName", and
* if the result of calling object.getName() is
* "Larry Fine", then the JSONObject will contain
* "name": "Larry Fine".
*
* The {@link JSONPropertyName} annotation can be used on a bean getter to
* override key name used in the JSONObject. For example, using the object
* above with the getName method, if we annotated it with:
*
* @JSONPropertyName("FullName")
* public String getName() { return this.name; }
*
* The resulting JSON object would contain "FullName": "Larry Fine"
*
* Similarly, the {@link JSONPropertyName} annotation can be used on non-
* get and is methods. We can also override key
* name used in the JSONObject as seen below even though the field would normally
* be ignored:
*
* @JSONPropertyName("FullName")
* public String fullName() { return this.name; }
*
* The resulting JSON object would contain "FullName": "Larry Fine"
*
* The {@link JSONPropertyIgnore} annotation can be used to force the bean property
* to not be serialized into JSON. If both {@link JSONPropertyIgnore} and
* {@link JSONPropertyName} are defined on the same method, a depth comparison is
* performed and the one closest to the concrete class being serialized is used.
* If both annotations are at the same level, then the {@link JSONPropertyIgnore}
* annotation takes precedent and the field is not serialized.
* For example, the following declaration would prevent the getName
* method from being serialized:
*
* @JSONPropertyName("FullName")
* @JSONPropertyIgnore
* public String getName() { return this.name; }
*
*
*
* @param bean
* An object that has getter methods that should be used to make
* a JSONObject.
*/
public JSONObject(Object bean) {
this();
this.populateMap(bean);
}
/**
* 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 obtained
* from the object.
*/
public JSONObject(Object object, String names[]) {
this(names.length);
Class c = object.getClass();
for (int i = 0; i < names.length; i += 1) {
String name = names[i];
try {
this.putOpt(name, c.getField(name).get(object));
} catch (Exception ignore) {
}
}
}
/**
* Construct a JSONObject from a source JSON text string. This is the most
* commonly used JSONObject constructor.
*
* @param source
* A string beginning with { (left
* brace) and ending with }
* (right brace).
* @exception JSONException
* If there is a syntax error in the source string or a
* duplicated key.
*/
public JSONObject(String source) throws JSONException {
this(new JSONTokener(source));
}
/**
* Construct a JSONObject from a ResourceBundle.
*
* @param baseName
* The ResourceBundle base name.
* @param locale
* The Locale to load the ResourceBundle for.
* @throws JSONException
* If any JSONExceptions are detected.
*/
public JSONObject(String baseName, Locale locale) throws JSONException {
this();
ResourceBundle bundle = ResourceBundle.getBundle(baseName, locale,
Thread.currentThread().getContextClassLoader());
// Iterate through the keys in the bundle.
Enumeration keys = bundle.getKeys();
while (keys.hasMoreElements()) {
Object key = keys.nextElement();
if (key != null) {
// Go through the path, ensuring that there is a nested JSONObject for each
// segment except the last. Add the value using the last segment's name into
// the deepest nested JSONObject.
String[] path = ((String) key).split("\\.");
int last = path.length - 1;
JSONObject target = this;
for (int i = 0; i < last; i += 1) {
String segment = path[i];
JSONObject nextTarget = target.optJSONObject(segment);
if (nextTarget == null) {
nextTarget = new JSONObject();
target.put(segment, nextTarget);
}
target = nextTarget;
}
target.put(path[last], bundle.getString((String) key));
}
}
}
/**
* Constructor to specify an initial capacity of the internal map. Useful for library
* internal calls where we know, or at least can best guess, how big this JSONObject
* will be.
*
* @param initialCapacity initial capacity of the internal map.
*/
protected JSONObject(int initialCapacity){
this.map = new HashMap(initialCapacity);
}
/**
* 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.
*
* If only one value is accumulated that is not a JSONArray, then the result
* will be the same as using put. But if multiple values are accumulated,
* then the result will be like append.
*
* @param key
* A key string.
* @param value
* An object to be accumulated under the key.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is null.
*/
public JSONObject accumulate(String key, Object value) throws JSONException {
testValidity(value);
Object object = this.opt(key);
if (object == null) {
this.put(key,
value instanceof JSONArray ? new JSONArray().put(value)
: value);
} else if (object instanceof JSONArray) {
((JSONArray) object).put(value);
} else {
this.put(key, new JSONArray().put(object).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 value is non-finite number or if the current value associated with
* the key is not a JSONArray.
* @throws NullPointerException
* If the key is null.
*/
public JSONObject append(String key, Object value) throws JSONException {
testValidity(value);
Object object = this.opt(key);
if (object == null) {
this.put(key, new JSONArray().put(value));
} else if (object instanceof JSONArray) {
this.put(key, ((JSONArray) object).put(value));
} else {
throw new JSONException("JSONObject[" + key
+ "] is not a JSONArray.");
}
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.
*/
public static String doubleToString(double d) {
if (Double.isInfinite(d) || Double.isNaN(d)) {
return "null";
}
// Shave off trailing zeros and decimal point, if possible.
String string = Double.toString(d);
if (string.indexOf('.') > 0 && string.indexOf('e') < 0
&& string.indexOf('E') < 0) {
while (string.endsWith("0")) {
string = string.substring(0, string.length() - 1);
}
if (string.endsWith(".")) {
string = string.substring(0, string.length() - 1);
}
}
return string;
}
/**
* 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 {
if (key == null) {
throw new JSONException("Null key.");
}
Object object = this.opt(key);
if (object == null) {
throw new JSONException("JSONObject[" + quote(key) + "] not found.");
}
return object;
}
/**
* Get the enum value associated with a key.
*
* @param clazz
* The type of enum to retrieve.
* @param key
* A key string.
* @return The enum value associated with the key
* @throws JSONException
* if the key is not found or if the value cannot be converted
* to an enum.
*/
public E getEnum(Class clazz, String key) throws JSONException {
E val = optEnum(clazz, key);
if(val==null) {
// JSONException should really take a throwable argument.
// If it did, I would re-implement this with the Enum.valueOf
// method and place any thrown exception in the JSONException
throw new JSONException("JSONObject[" + quote(key)
+ "] is not an enum of type " + quote(clazz.getSimpleName())
+ ".");
}
return val;
}
/**
* 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 object = this.get(key);
if (object.equals(Boolean.FALSE)
|| (object instanceof String && ((String) object)
.equalsIgnoreCase("false"))) {
return false;
} else if (object.equals(Boolean.TRUE)
|| (object instanceof String && ((String) object)
.equalsIgnoreCase("true"))) {
return true;
}
throw new JSONException("JSONObject[" + quote(key)
+ "] is not a Boolean.");
}
/**
* Get the BigInteger 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 cannot
* be converted to BigInteger.
*/
public BigInteger getBigInteger(String key) throws JSONException {
Object object = this.get(key);
try {
return new BigInteger(object.toString());
} catch (Exception e) {
throw new JSONException("JSONObject[" + quote(key)
+ "] could not be converted to BigInteger.", e);
}
}
/**
* Get the BigDecimal 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
* cannot be converted to BigDecimal.
*/
public BigDecimal getBigDecimal(String key) throws JSONException {
Object object = this.get(key);
if (object instanceof BigDecimal) {
return (BigDecimal)object;
}
try {
return new BigDecimal(object.toString());
} catch (Exception e) {
throw new JSONException("JSONObject[" + quote(key)
+ "] could not be converted to BigDecimal.", e);
}
}
/**
* 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 object = this.get(key);
try {
return object instanceof Number ? ((Number) object).doubleValue()
: Double.parseDouble(object.toString());
} catch (Exception e) {
throw new JSONException("JSONObject[" + quote(key)
+ "] is not a number.", e);
}
}
/**
* Get the float 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 float getFloat(String key) throws JSONException {
Object object = this.get(key);
try {
return object instanceof Number ? ((Number) object).floatValue()
: Float.parseFloat(object.toString());
} catch (Exception e) {
throw new JSONException("JSONObject[" + quote(key)
+ "] is not a number.", e);
}
}
/**
* Get the Number 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 Number getNumber(String key) throws JSONException {
Object object = this.get(key);
try {
if (object instanceof Number) {
return (Number)object;
}
return stringToNumber(object.toString());
} catch (Exception e) {
throw new JSONException("JSONObject[" + quote(key)
+ "] is not a number.", e);
}
}
/**
* Get the int value associated with a key.
*
* @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 object = this.get(key);
try {
return object instanceof Number ? ((Number) object).intValue()
: Integer.parseInt((String) object);
} catch (Exception e) {
throw new JSONException("JSONObject[" + quote(key)
+ "] is not an int.", e);
}
}
/**
* 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 object = this.get(key);
if (object instanceof JSONArray) {
return (JSONArray) object;
}
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 object = this.get(key);
if (object instanceof JSONObject) {
return (JSONObject) object;
}
throw new JSONException("JSONObject[" + quote(key)
+ "] is not a JSONObject.");
}
/**
* Get the long value associated with a key.
*
* @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 object = this.get(key);
try {
return object instanceof Number ? ((Number) object).longValue()
: Long.parseLong((String) object);
} catch (Exception e) {
throw new JSONException("JSONObject[" + quote(key)
+ "] is not a long.", e);
}
}
/**
* Get an array of field names from a JSONObject.
*
* @return An array of field names, or null if there are no names.
*/
public static String[] getNames(JSONObject jo) {
if (jo.isEmpty()) {
return null;
}
return jo.keySet().toArray(new String[jo.length()]);
}
/**
* Get an array of field names from an Object.
*
* @return An array of field names, or null if there are no names.
*/
public static String[] getNames(Object object) {
if (object == null) {
return null;
}
Class klass = object.getClass();
Field[] fields = klass.getFields();
int length = fields.length;
if (length == 0) {
return null;
}
String[] names = new String[length];
for (int i = 0; i < length; i += 1) {
names[i] = fields[i].getName();
}
return names;
}
/**
* Get the string associated with a key.
*
* @param key
* A key string.
* @return A string which is the value.
* @throws JSONException
* if there is no string value for the key.
*/
public String getString(String key) throws JSONException {
Object object = this.get(key);
if (object instanceof String) {
return (String) object;
}
throw new JSONException("JSONObject[" + quote(key) + "] not a string.");
}
/**
* 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.map.containsKey(key);
}
/**
* Increment a property of a JSONObject. If there is no such property,
* create one with a value of 1. If there is such a property, and if it is
* an Integer, Long, Double, or Float, then add one to it.
*
* @param key
* A key string.
* @return this.
* @throws JSONException
* If there is already a property with this name that is not an
* Integer, Long, Double, or Float.
*/
public JSONObject increment(String key) throws JSONException {
Object value = this.opt(key);
if (value == null) {
this.put(key, 1);
} else if (value instanceof BigInteger) {
this.put(key, ((BigInteger)value).add(BigInteger.ONE));
} else if (value instanceof BigDecimal) {
this.put(key, ((BigDecimal)value).add(BigDecimal.ONE));
} else if (value instanceof Integer) {
this.put(key, ((Integer) value).intValue() + 1);
} else if (value instanceof Long) {
this.put(key, ((Long) value).longValue() + 1L);
} else if (value instanceof Double) {
this.put(key, ((Double) value).doubleValue() + 1.0d);
} else if (value instanceof Float) {
this.put(key, ((Float) value).floatValue() + 1.0f);
} else {
throw new JSONException("Unable to increment [" + quote(key) + "].");
}
return this;
}
/**
* 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(this.opt(key));
}
/**
* Get an enumeration of the keys of the JSONObject. Modifying this key Set will also
* modify the JSONObject. Use with caution.
*
* @see Set#iterator()
*
* @return An iterator of the keys.
*/
public Iterator keys() {
return this.keySet().iterator();
}
/**
* Get a set of keys of the JSONObject. Modifying this key Set will also modify the
* JSONObject. Use with caution.
*
* @see Map#keySet()
*
* @return A keySet.
*/
public Set keySet() {
return this.map.keySet();
}
/**
* Get a set of entries of the JSONObject. These are raw values and may not
* match what is returned by the JSONObject get* and opt* functions. Modifying
* the returned EntrySet or the Entry objects contained therein will modify the
* backing JSONObject. This does not return a clone or a read-only view.
*
* Use with caution.
*
* @see Map#entrySet()
*
* @return An Entry Set
*/
protected Set entrySet() {
return this.map.entrySet();
}
/**
* Get the number of keys stored in the JSONObject.
*
* @return The number of keys in the JSONObject.
*/
public int length() {
return this.map.size();
}
/**
* Check if JSONObject is empty.
*
* @return true if JSONObject is empty, otherwise false.
*/
public boolean isEmpty() {
return map.isEmpty();
}
/**
* 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() {
if(this.map.isEmpty()) {
return null;
}
return new JSONArray(this.map.keySet());
}
/**
* Produce a string from a Number.
*
* @param number
* A Number
* @return A String.
* @throws JSONException
* If n is a non-finite number.
*/
public static String numberToString(Number number) throws JSONException {
if (number == null) {
throw new JSONException("Null pointer");
}
testValidity(number);
// Shave off trailing zeros and decimal point, if possible.
String string = number.toString();
if (string.indexOf('.') > 0 && string.indexOf('e') < 0
&& string.indexOf('E') < 0) {
while (string.endsWith("0")) {
string = string.substring(0, string.length() - 1);
}
if (string.endsWith(".")) {
string = string.substring(0, string.length() - 1);
}
}
return string;
}
/**
* 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.map.get(key);
}
/**
* Get the enum value associated with a key.
*
* @param clazz
* The type of enum to retrieve.
* @param key
* A key string.
* @return The enum value associated with the key or null if not found
*/
public E optEnum(Class clazz, String key) {
return this.optEnum(clazz, key, null);
}
/**
* Get the enum value associated with a key.
*
* @param clazz
* The type of enum to retrieve.
* @param key
* A key string.
* @param defaultValue
* The default in case the value is not found
* @return The enum value associated with the key or defaultValue
* if the value is not found or cannot be assigned to clazz
*/
public E optEnum(Class clazz, String key, E defaultValue) {
try {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (clazz.isAssignableFrom(val.getClass())) {
// we just checked it!
@SuppressWarnings("unchecked")
E myE = (E) val;
return myE;
}
return Enum.valueOf(clazz, val.toString());
} catch (IllegalArgumentException e) {
return defaultValue;
} catch (NullPointerException e) {
return defaultValue;
}
}
/**
* 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 this.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) {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof Boolean){
return ((Boolean) val).booleanValue();
}
try {
// we'll use the get anyway because it does string conversion.
return this.getBoolean(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get an optional BigDecimal 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 BigDecimal optBigDecimal(String key, BigDecimal defaultValue) {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof BigDecimal){
return (BigDecimal) val;
}
if (val instanceof BigInteger){
return new BigDecimal((BigInteger) val);
}
if (val instanceof Double || val instanceof Float){
return new BigDecimal(((Number) val).doubleValue());
}
if (val instanceof Long || val instanceof Integer
|| val instanceof Short || val instanceof Byte){
return new BigDecimal(((Number) val).longValue());
}
// don't check if it's a string in case of unchecked Number subclasses
try {
return new BigDecimal(val.toString());
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get an optional BigInteger 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 BigInteger optBigInteger(String key, BigInteger defaultValue) {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof BigInteger){
return (BigInteger) val;
}
if (val instanceof BigDecimal){
return ((BigDecimal) val).toBigInteger();
}
if (val instanceof Double || val instanceof Float){
return new BigDecimal(((Number) val).doubleValue()).toBigInteger();
}
if (val instanceof Long || val instanceof Integer
|| val instanceof Short || val instanceof Byte){
return BigInteger.valueOf(((Number) val).longValue());
}
// don't check if it's a string in case of unchecked Number subclasses
try {
// the other opt functions handle implicit conversions, i.e.
// jo.put("double",1.1d);
// jo.optInt("double"); -- will return 1, not an error
// this conversion to BigDecimal then to BigInteger is to maintain
// that type cast support that may truncate the decimal.
final String valStr = val.toString();
if(isDecimalNotation(valStr)) {
return new BigDecimal(valStr).toBigInteger();
}
return new BigInteger(valStr);
} catch (Exception e) {
return defaultValue;
}
}
/**
* 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 this.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) {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof Number){
return ((Number) val).doubleValue();
}
if (val instanceof String) {
try {
return Double.parseDouble((String) val);
} catch (Exception e) {
return defaultValue;
}
}
return defaultValue;
}
/**
* Get the optional double value associated with an index. NaN is returned
* if there is no value for the index, or if the value is not a number and
* cannot be converted to a number.
*
* @param key
* A key string.
* @return The value.
*/
public float optFloat(String key) {
return this.optFloat(key, Float.NaN);
}
/**
* Get the optional double value associated with an index. The defaultValue
* is returned if there is no value for the index, or if the value is not a
* number and cannot be converted to a number.
*
* @param key
* A key string.
* @param defaultValue
* The default value.
* @return The value.
*/
public float optFloat(String key, float defaultValue) {
Object val = this.opt(key);
if (JSONObject.NULL.equals(val)) {
return defaultValue;
}
if (val instanceof Number){
return ((Number) val).floatValue();
}
if (val instanceof String) {
try {
return Float.parseFloat((String) val);
} catch (Exception e) {
return defaultValue;
}
}
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 this.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) {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof Number){
return ((Number) val).intValue();
}
if (val instanceof String) {
try {
return new BigDecimal((String) val).intValue();
} catch (Exception e) {
return defaultValue;
}
}
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 = this.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 object = this.opt(key);
return object instanceof JSONObject ? (JSONObject) object : 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 this.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) {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof Number){
return ((Number) val).longValue();
}
if (val instanceof String) {
try {
return new BigDecimal((String) val).longValue();
} catch (Exception e) {
return defaultValue;
}
}
return defaultValue;
}
/**
* Get an optional {@link Number} value associated with a key, or null
* 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 ({@link BigDecimal}). This method
* would be used in cases where type coercion of the number value is unwanted.
*
* @param key
* A key string.
* @return An object which is the value.
*/
public Number optNumber(String key) {
return this.optNumber(key, null);
}
/**
* Get an optional {@link Number} 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. This method
* would be used in cases where type coercion of the number value is unwanted.
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return An object which is the value.
*/
public Number optNumber(String key, Number defaultValue) {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof Number){
return (Number) val;
}
if (val instanceof String) {
try {
return stringToNumber((String) val);
} catch (Exception e) {
return defaultValue;
}
}
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 converted to a string.
*
* @param key
* A key string.
* @return A string which is the value.
*/
public String optString(String key) {
return this.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 object = this.opt(key);
return NULL.equals(object) ? defaultValue : object.toString();
}
/**
* Populates the internal map of the JSONObject with the bean properties. The
* bean can not be recursive.
*
* @see JSONObject#JSONObject(Object)
*
* @param bean
* the bean
*/
private void populateMap(Object bean) {
Class klass = bean.getClass();
// If klass is a System class then set includeSuperClass to false.
boolean includeSuperClass = klass.getClassLoader() != null;
Method[] methods = includeSuperClass ? klass.getMethods() : klass.getDeclaredMethods();
for (final Method method : methods) {
final int modifiers = method.getModifiers();
if (Modifier.isPublic(modifiers)
&& !Modifier.isStatic(modifiers)
&& method.getParameterTypes().length == 0
&& !method.isBridge()
&& method.getReturnType() != Void.TYPE
&& isValidMethodName(method.getName())) {
final String key = getKeyNameFromMethod(method);
if (key != null && !key.isEmpty()) {
try {
final Object result = method.invoke(bean);
if (result != null) {
this.map.put(key, wrap(result));
// we don't use the result anywhere outside of wrap
// if it's a resource we should be sure to close it
// after calling toString
if (result instanceof Closeable) {
try {
((Closeable) result).close();
} catch (IOException ignore) {
}
}
}
} catch (IllegalAccessException ignore) {
} catch (IllegalArgumentException ignore) {
} catch (InvocationTargetException ignore) {
}
}
}
}
}
private boolean isValidMethodName(String name) {
return !"getClass".equals(name) && !"getDeclaringClass".equals(name);
}
private String getKeyNameFromMethod(Method method) {
final int ignoreDepth = getAnnotationDepth(method, JSONPropertyIgnore.class);
if (ignoreDepth > 0) {
final int forcedNameDepth = getAnnotationDepth(method, JSONPropertyName.class);
if (forcedNameDepth < 0 || ignoreDepth 3) {
key = name.substring(3);
} else if (name.startsWith("is") && name.length() > 2) {
key = name.substring(2);
} else {
return null;
}
// if the first letter in the key is not uppercase, then skip.
// This is to maintain backwards compatibility before PR406
// (https://github.com/stleary/JSON-java/pull/406/)
if (Character.isLowerCase(key.charAt(0))) {
return null;
}
if (key.length() == 1) {
key = key.toLowerCase(Locale.ROOT);
} else if (!Character.isUpperCase(key.charAt(1))) {
key = key.substring(0, 1).toLowerCase(Locale.ROOT) + key.substring(1);
}
return key;
}
/**
* Searches the class hierarchy to see if the method or it's super
* implementations and interfaces has the annotation.
*
* @param
* type of the annotation
*
* @param m
* method to check
* @param annotationClass
* annotation to look for
* @return the {@link Annotation} if the annotation exists on the current method
* or one of it's super class definitions
*/
private static A getAnnotation(final Method m, final Class annotationClass) {
// if we have invalid data the result is null
if (m == null || annotationClass == null) {
return null;
}
if (m.isAnnotationPresent(annotationClass)) {
return m.getAnnotation(annotationClass);
}
// if we've already reached the Object class, return null;
Class c = m.getDeclaringClass();
if (c.getSuperclass() == null) {
return null;
}
// check directly implemented interfaces for the method being checked
for (Class i : c.getInterfaces()) {
try {
Method im = i.getMethod(m.getName(), m.getParameterTypes());
return getAnnotation(im, annotationClass);
} catch (final SecurityException ex) {
continue;
} catch (final NoSuchMethodException ex) {
continue;
}
}
try {
return getAnnotation(
c.getSuperclass().getMethod(m.getName(), m.getParameterTypes()),
annotationClass);
} catch (final SecurityException ex) {
return null;
} catch (final NoSuchMethodException ex) {
return null;
}
}
/**
* Searches the class hierarchy to see if the method or it's super
* implementations and interfaces has the annotation. Returns the depth of the
* annotation in the hierarchy.
*
* @param
* type of the annotation
*
* @param m
* method to check
* @param annotationClass
* annotation to look for
* @return Depth of the annotation or -1 if the annotation is not on the method.
*/
private static int getAnnotationDepth(final Method m, final Class
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