Class JSONUtils

java.lang.Object
net.sf.json.util.JSONUtils
public final class JSONUtils extends Object
Provides useful methods on java objects and JSON values.
Version:
7

  • Field Details

  • Constructor Details

    • JSONUtils

      private JSONUtils()

  • Method Details

    • convertToJavaIdentifier

      public static String convertToJavaIdentifier(String key)
      Transforms the string into a valid Java Identifier.
      The default strategy is JavaIdentifierTransformer.NOOP
      Throws:
      JSONException - if the string can not be transformed.

    • convertToJavaIdentifier

      public static String convertToJavaIdentifier(String key, JsonConfig jsonConfig)
      Transforms the string into a valid Java Identifier.
      The default strategy is JavaIdentifierTransformer.NOOP
      Throws:
      JSONException - if the string can not be transformed.

    • doubleToString

      public static 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.

    • getFunctionBody

      public static String getFunctionBody(String function)
      Returns the body of a function literal.

    • getFunctionParams

      public static String getFunctionParams(String function)
      Returns the params of a function literal.

    • getInnerComponentType

      public static Class getInnerComponentType(Class type)
      Returns the inner-most component type of an Array.

    • getMorpherRegistry

      public static net.sf.ezmorph.MorpherRegistry getMorpherRegistry()
      Returns the singleton MorpherRegistry.

    • getProperties

      public static Map getProperties(JSONObject jsonObject)
      Creates a Map with all the properties of the JSONObject.

    • getTypeClass

      public static Class getTypeClass(Object obj)
      Returns the JSON type.
      Values are Object, String, Boolean, Number(subclasses) & JSONFunction.

    • hashCode

      public static int hashCode(Object value)
      Returns the hashcode of value.
      If null it will return JSONNull.getInstance().hashCode().
      If value is JSON, JSONFunction or String, value.hashCode is returned, otherwise the value is transformed to a String an its hashcode is returned.

    • isArray

      public static boolean isArray(Class clazz)
      Tests if a Class represents an array or Collection.

    • isArray

      public static boolean isArray(Object obj)
      Tests if obj is an array or Collection.

    • isBoolean

      public static boolean isBoolean(Class clazz)
      Tests if Class represents a Boolean or primitive boolean

    • isBoolean

      public static boolean isBoolean(Object obj)
      Tests if obj is a Boolean or primitive boolean

    • isDouble

      public static boolean isDouble(Class clazz)
      Tests if Class represents a primitive double or wrapper.

    • isFunction

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

    • isFunctionHeader

      public static boolean isFunctionHeader(Object obj)
      Tests if obj is javaScript function header.
      Obj must be a non-null String and match "^function[ ]?\\(.*\\)$"

    • isJavaIdentifier

      public static boolean isJavaIdentifier(String str)
      Returns trus if str represents a valid Java identifier.

    • isNull

      public static boolean isNull(Object obj)
      Tests if the obj is a javaScript null.

    • isNumber

      public static boolean isNumber(Class clazz)
      Tests if Class represents a primitive number or wrapper.

    • isNumber

      public static boolean isNumber(Object obj)
      Tests if obj is a primitive number or wrapper.

    • isObject

      public static boolean isObject(Object obj)
      Tests if obj is not a boolean, number, string or array.

    • isString

      public static boolean isString(Class clazz)
      Tests if Class represents a String or a char

    • isString

      public static boolean isString(Object obj)
      Tests if obj is a String or a char

    • mayBeJSON

      public static boolean mayBeJSON(String string)
      Tests if the String possibly represents a valid JSON String.
      Valid JSON strings are:
      • "null"
      • starts with "[" and ends with "]"
      • starts with "{" and ends with "}"

    • newDynaBean

      public static org.apache.commons.beanutils.DynaBean newDynaBean(JSONObject jsonObject)
      Creates a new MorphDynaBean from a JSONObject. The MorphDynaBean will have all the properties of the original JSONObject with the most accurate type. Values of properties are not copied.

    • newDynaBean

      public static org.apache.commons.beanutils.DynaBean newDynaBean(JSONObject jsonObject, JsonConfig jsonConfig)
      Creates a new MorphDynaBean from a JSONObject. The MorphDynaBean will have all the properties of the original JSONObject with the most accurate type. Values of properties are not copied.

    • numberToString

      public static String numberToString(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 String quote(String string)
      Produce a string in double quotes with backslash sequences in all the right places. A backslash will be inserted within invalid input: '<'/, allowing JSON text to be delivered in HTML. In JSON text, a string cannot contain a control character or an unescaped quote or backslash.
      Parameters:
      string - A String
      Returns:
      A String correctly formatted for insertion in a JSON text.

    • quoteCanonical

      public static String quoteCanonical(String s)
      Minimal escape form.

    • stripQuotes

      public static String stripQuotes(String input)
      Strips any single-quotes or double-quotes from both sides of the string.

    • hasQuotes

      public static boolean hasQuotes(String input)
      Returns true if the input has single-quotes or double-quotes at both sides.

    • isJsonKeyword

      public static boolean isJsonKeyword(String input, JsonConfig jsonConfig)

    • testValidity

      public static void testValidity(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 Number transformNumber(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 String valueToString(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.

    • valueToCanonicalString

      public static String valueToCanonicalString(Object value)

    • valueToString

      public static String valueToString(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.

    • isBigDecimal

      private static boolean isBigDecimal(Number n)
      Finds out if n represents a BigInteger
      Returns:
      true if n is instanceOf BigInteger or the literal value can be evaluated as a BigInteger

    • isBigInteger

      private static boolean isBigInteger(Number n)
      Finds out if n represents a BigInteger
      Returns:
      true if n is instanceOf BigInteger or the literal value can be evaluated as a BigInteger

    • isDouble

      private static boolean isDouble(Number n)
      Finds out if n represents a Double.
      Returns:
      true if n is instanceOf Double or the literal value can be evaluated as a Double.

    • isFloat

      private static boolean isFloat(Number n)
      Finds out if n represents a Float.
      Returns:
      true if n is instanceOf Float or the literal value can be evaluated as a Float.

    • isInteger

      private static boolean isInteger(Number n)
      Finds out if n represents an Integer.
      Returns:
      true if n is instanceOf Integer or the literal value can be evaluated as an Integer.

    • isLong

      private static boolean isLong(Number n)
      Finds out if n represents a Long.
      Returns:
      true if n is instanceOf Long or the literal value can be evaluated as a Long.