net.sf.json.util
Class JSONUtils

java.lang.Object
  net.sf.json.util.JSONUtils

public final class JSONUtils
extends java.lang.Object

Provides useful methods on java objects.

Version:

6

Author:

Andres Almiray

Method Summary

static java.lang.String	doubleToString(double d) Produce a string from a double.
static java.lang.String	getFunctionParams(java.lang.String function) Returns the params of a function literal.
static java.lang.Class	getInnerComponentType(java.lang.Class type)
static net.sf.ezmorph.MorpherRegistry	getMorpherRegistry()
static java.util.Map	getProperties(JSONObject jsonObject) Creates a Map with all the properties of the JSONObject.
static java.lang.Class	getTypeClass(java.lang.Object obj) Returns the JSON type.
static boolean	isArray(java.lang.Class clazz) Tests if a Class represents an array or Collection.
static boolean	isArray(java.lang.Object obj) Tests if obj is an array or Collection.
static boolean	isBoolean(java.lang.Class clazz) Tests if Class represents a Boolean or primitive boolean
static boolean	isBoolean(java.lang.Object obj) Tests if obj is a Boolean or primitive boolean
static boolean	isDouble(java.lang.Class clazz) Tests if Class represents a primitive double or wrapper.
static boolean	isFunction(java.lang.Object obj) Tests if obj is javaScript function. Obj must ba a non-null String and match "^function[ ]?\\(.\*\)[ ]?\\{.\*\}$"
static boolean	isFunctionHeader(java.lang.Object obj) Tests if obj is javaScript function header. Obj must ba a non-null String and match "^function[ ]?\\(.\*\)$"
static boolean	isNull(java.lang.Object obj) Tests if the obj is a javaScript null.
static boolean	isNumber(java.lang.Class clazz) Tests if Class represents a primitive number or wrapper.
static boolean	isNumber(java.lang.Object obj) Tests if obj is a primitive number or wrapper.
static boolean	isObject(java.lang.Object obj) Tests if obj is not a boolean, number, string or array.
static boolean	isString(java.lang.Class clazz) Tests if Class represents a String or a char
static boolean	isString(java.lang.Object obj) Tests if obj is a String or a char
static boolean	mayBeJSON(java.lang.String string)
static JSONDynaBean	newDynaBean(JSONObject jsonObject)
static java.lang.String	numberToString(java.lang.Number n) Produce a string from a Number.
static java.lang.String	quote(java.lang.String string) Produce a string in double quotes with backslash sequences in all the right places.
static void	testValidity(java.lang.Object o) Throw an exception if the object is an NaN or infinite number.
static java.lang.Number	transformNumber(java.lang.Number input) Transforms a Number into a valid javascript number. Float gets promoted to Double. Byte and Short get promoted to Integer. Long gets downgraded to Integer if possible.
static java.lang.String	valueToString(java.lang.Object value) Make a JSON text of an Object value.
static java.lang.String	valueToString(java.lang.Object value, int indentFactor, int indent) Make a prettyprinted JSON text of an object value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

doubleToString

public static java.lang.String doubleToString(double d)

Produce a string from a double. The string "null" will be returned if the number is not finite.

Parameters:

d - A double.

Returns:

A String.

getFunctionParams

public static java.lang.String getFunctionParams(java.lang.String function)

Returns the params of a function literal.

getInnerComponentType

public static java.lang.Class getInnerComponentType(java.lang.Class type)

getMorpherRegistry

public static net.sf.ezmorph.MorpherRegistry getMorpherRegistry()

getProperties

public static java.util.Map getProperties(JSONObject jsonObject)

Creates a Map with all the properties of the JSONObject.

getTypeClass

public static java.lang.Class getTypeClass(java.lang.Object obj)

Returns the JSON type.

isArray

public static boolean isArray(java.lang.Class clazz)

Tests if a Class represents an array or Collection.

isArray

public static boolean isArray(java.lang.Object obj)

Tests if obj is an array or Collection.

isBoolean

public static boolean isBoolean(java.lang.Class clazz)

Tests if Class represents a Boolean or primitive boolean

isBoolean

public static boolean isBoolean(java.lang.Object obj)

Tests if obj is a Boolean or primitive boolean

isDouble

public static boolean isDouble(java.lang.Class clazz)

Tests if Class represents a primitive double or wrapper.

isFunction

public static boolean isFunction(java.lang.Object obj)

Tests if obj is javaScript function.
Obj must ba a non-null String and match "^function[ ]?\\(.\*\)[ ]?\\{.\*\}$"

isFunctionHeader

public static boolean isFunctionHeader(java.lang.Object obj)

Tests if obj is javaScript function header.
Obj must ba a non-null String and match "^function[ ]?\\(.\*\)$"

isNull

public static boolean isNull(java.lang.Object obj)

Tests if the obj is a javaScript null.

isNumber

public static boolean isNumber(java.lang.Class clazz)

Tests if Class represents a primitive number or wrapper.

isNumber

public static boolean isNumber(java.lang.Object obj)

Tests if obj is a primitive number or wrapper.

isObject

public static boolean isObject(java.lang.Object obj)

Tests if obj is not a boolean, number, string or array.

isString

public static boolean isString(java.lang.Class clazz)

Tests if Class represents a String or a char

isString

public static boolean isString(java.lang.Object obj)

Tests if obj is a String or a char

mayBeJSON

public static boolean mayBeJSON(java.lang.String string)

newDynaBean

public static JSONDynaBean newDynaBean(JSONObject jsonObject)
                                throws java.lang.Exception

Throws:

java.lang.Exception

numberToString

public static java.lang.String numberToString(java.lang.Number n)

Produce a string from a Number.

Parameters:

n - A Number

Returns:

A String.

Throws:

JSONException - If n is a non-finite number.

quote

public static java.lang.String quote(java.lang.String string)

Produce a string in double quotes with backslash sequences in all the right places. A backslash will be inserted within CAUTION: if string represents a javascript function, translation of characters will not take place. This will produce a non-conformant JSON text.

Parameters:

string - A String

Returns:

A String correctly formatted for insertion in a JSON text.

testValidity

public static void testValidity(java.lang.Object o)

Throw an exception if the object is an NaN or infinite number.

Parameters:

o - The object to test.

Throws:

JSONException - If o is a non-finite number.

transformNumber

public static java.lang.Number transformNumber(java.lang.Number input)

Transforms a Number into a valid javascript number.
Float gets promoted to Double.
Byte and Short get promoted to Integer.
Long gets downgraded to Integer if possible.

valueToString

public static java.lang.String valueToString(java.lang.Object value)

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.

Parameters:

value - The value to be serialized.

Returns:

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.

valueToString

public static java.lang.String valueToString(java.lang.Object value,
                                             int indentFactor,
                                             int indent)

Make a prettyprinted JSON text of an object value.

Warning: This method assumes that the data structure is acyclical.

Parameters:

value - The value to be serialized.

indentFactor - The number of spaces to add to each level of indentation.

indent - The indentation of the top level.

Returns:

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.