BeowulfJUtils (beowulfj-core 0.0.4 API)

java.lang.Object
- com.beowulfchain.beowulfj.util.BeowulfJUtils

```
public class BeowulfJUtils
extends Object
```
This class contains some utility methods used by BeowulfJ.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static String`	`byteToHex(byte num)`
`static byte[]`	`decodeHexString(String hexString)`
`static String`	`fromEckeyToWif(eu.bittrade.crypto.core.ECKey ecKey)`
`static String`	`fromPrivKeyHexToWif(String hexString)`
`static eu.bittrade.crypto.core.ECKey`	`fromWifToEckey(String wif)`
`static String`	`getAddressFromEckey(eu.bittrade.crypto.core.ECKey ecKey)`
`static byte`	`hexToByte(String hexString)`
`static String`	`privateKeyToWIF(eu.bittrade.crypto.core.ECKey privateKey)` Get the WIF representation of a private key.
`static <T> T`	`setIfNotNull(T objectToSet, String message)` Like `setIfNotNull(Object, String, Object)`, but does not require a default value.
`static <T> T`	`setIfNotNull(T objectToSet, String message, T defaultValue)` This method will check if given `objectToSet` is `null`.
`static <T> T`	`setIfNotNull(T objectToSet, T defaultValue)` Like `setIfNotNull(Object, String, Object)`, but the generated exception will contain a static text.
`static <T> List<T>`	`setIfNotNullAndNotEmpty(List<T> collectionToSet, String message)`
`static int`	`toDigit(char hexChar)`
`static byte[]`	`transformBooleanToByteArray(boolean boolValue)` Transform a boolean value into its byte representation.
`static byte`	`transformByteToLittleEndian(byte byteValue)` Change the order of a byte to little endian.
`static String`	`transformDateToString(Date date)` This method transform a date and returns this date in its String representation.
`static byte[]`	`transformIntToByteArray(int intValue)` Transform an int value into its byte representation.
`static byte[]`	`transformIntToVarIntByteArray(int intValue)` Transform an int value into its byte representation.
`static byte[]`	`transformLongToByteArray(long longValue)` Transform a long variable into a byte array.
`static byte[]`	`transformLongToVarIntByteArray(long longValue)` Transform a long value into its byte representation.
`static byte[]`	`transformShortToByteArray(int shortValue)` Transform a short variable into a byte array.
`static byte[]`	`transformShortToByteArray(short shortValue)` Transform an short value into its byte representation.
`static long`	`transformStringToTimestamp(String dateTime)` This method transforms a String into a timestamp.
`static byte[]`	`transformStringToVarIntByteArray(String string)` Get the VarInt-byte representation of a String.
`static boolean`	`verifyJsonString(String customJsonString)` This method can be used to verify, if the given String is a valid JSON string.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - verifyJsonString
```
public static boolean verifyJsonString(String customJsonString)
```
    This method can be used to verify, if the given String is a valid JSON string.
    
    Parameters:
    
    customJsonString - The string to be checked.
    
    Returns:
    
    true If the given String is valid JSON, false if not.
  - transformShortToByteArray
```
public static byte[] transformShortToByteArray(int shortValue)
```
    Transform a short variable into a byte array.
    
    Parameters:
    
    shortValue - The short value to transform.
    
    Returns:
    
    The byte representation of the short value.
  - transformLongToByteArray
```
public static byte[] transformLongToByteArray(long longValue)
```
    Transform a long variable into a byte array.
    
    Parameters:
    
    longValue - The long value to transform.
    
    Returns:
    
    The byte representation of the long value.
  - transformByteToLittleEndian
```
public static byte transformByteToLittleEndian(byte byteValue)
```
    Change the order of a byte to little endian.
    
    Parameters:
    
    byteValue - The byte to transform.
    
    Returns:
    
    The byte in its little endian representation.
  - transformStringToVarIntByteArray
```
public static byte[] transformStringToVarIntByteArray(String string)
```
    Get the VarInt-byte representation of a String.
    Serializing a String has to be done in two steps:
    - 1. Length as VarInt
    - 2. The account name.
    Parameters:
    
    string - The string to transform.
    
    Returns:
    
    The VarInt-byte representation of the given String.
  - transformIntToVarIntByteArray
```
public static byte[] transformIntToVarIntByteArray(int intValue)
```
    Transform an int value into its byte representation.
    
    Parameters:
    
    intValue - The int value to transform.
    
    Returns:
    
    The byte representation of the given value.
  - transformShortToByteArray
```
public static byte[] transformShortToByteArray(short shortValue)
```
    Transform an short value into its byte representation.
    
    Parameters:
    
    shortValue - The short value to transform.
    
    Returns:
    
    The byte representation of the given value.
  - transformIntToByteArray
```
public static byte[] transformIntToByteArray(int intValue)
```
    Transform an int value into its byte representation.
    
    Parameters:
    
    intValue - The int value to transform.
    
    Returns:
    
    The byte representation of the given value.
  - transformBooleanToByteArray
```
public static byte[] transformBooleanToByteArray(boolean boolValue)
```
    Transform a boolean value into its byte representation.
    
    Parameters:
    
    boolValue - The bool value to transform.
    
    Returns:
    
    The byte representation of the given value.
  - transformLongToVarIntByteArray
```
public static byte[] transformLongToVarIntByteArray(long longValue)
```
    Transform a long value into its byte representation.
    
    Parameters:
    
    longValue - value The long value to transform.
    
    Returns:
    
    The byte representation of the given value.
  - transformDateToString
```
public static String transformDateToString(Date date)
```
    This method transform a date and returns this date in its String representation. The method is using the timezone and the date time pattern defined in the BeowulfJConfig.
    
    Parameters:
    
    date - The date to transform.
    
    Returns:
    
    The date in its String representation.
  - transformStringToTimestamp
```
public static long transformStringToTimestamp(String dateTime)
                                       throws ParseException
```
    This method transforms a String into a timestamp. The method is using the timezone and the date time pattern defined in the BeowulfJConfig.
    
    Parameters:
    
    dateTime - The date to transform.
    
    Returns:
    
    The timestamp representation of the given String.
    
    Throws:
    
    ParseException - If the String could not be transformed.
  - privateKeyToWIF
```
public static String privateKeyToWIF(eu.bittrade.crypto.core.ECKey privateKey)
```
    Get the WIF representation of a private key.
    
    Parameters:
    
    privateKey - The private key to get WIF representation for.
    
    Returns:
    
    The WIF representation of the given private key.
    
    Throws:
    
    IllegalStateException - If no private key is present in the given ECKey instance.
  - setIfNotNull
```
public static <T> T setIfNotNull(T objectToSet,
                                 String message)
```
    Like setIfNotNull(Object, String, Object), but does not require a default value.
    This method will check if given objectToSet is null and throw an InvalidParameterException if this is the case.
    
    Type Parameters:
    
    T - The type of the objectToSet.
    
    Parameters:
    
    objectToSet - The object to check.
    
    message - The message of the generated exception.
    
    Returns:
    
    The given objectToSet if its not null.
    
    Throws:
    
    InvalidParameterException - If the objectToSet is null.
  - setIfNotNull
```
public static <T> T setIfNotNull(T objectToSet,
                                 String message,
                                 @Nullable
                                 T defaultValue)
```
    This method will check if given objectToSet is null.
    In case objectToSet is not null, the objectToSet will be returned. Otherwise the method will check the defaultValue. The method will return the defaultValue if one has been provided.
    If all values are not set the method will throw an InvalidParameterException.
    
    Type Parameters:
    
    T - The type of the objectToSet.
    
    Parameters:
    
    objectToSet - The object to check.
    
    message - The message of the generated exception.
    
    defaultValue - The default value to apply in case the objectToSet is null.
    
    Returns:
    
    The given objectToSet if its not null. Otherwise the defaultValue will be returned.
    
    Throws:
    
    InvalidParameterException - If the objectToSet is null and, in addition, no defaultValue has been provided.
  - setIfNotNull
```
public static <T> T setIfNotNull(T objectToSet,
                                 @Nullable
                                 T defaultValue)
```
    Like setIfNotNull(Object, String, Object), but the generated exception will contain a static text.
    
    Type Parameters:
    
    T - The type of the objectToSet.
    
    Parameters:
    
    objectToSet - The object to check.
    
    defaultValue - The default value to apply in case the objectToSet is null.
    
    Returns:
    
    The given objectToSet if its not null. Otherwise the defaultValue will be returned.
    
    Throws:
    
    InvalidParameterException - If the objectToSet is null and, in addition, no defaultValue has been provided.
  - setIfNotNullAndNotEmpty
```
public static <T> List<T> setIfNotNullAndNotEmpty(List<T> collectionToSet,
                                                  String message)
```
    Type Parameters:
    
    T - The type object.
    
    Parameters:
    
    collectionToSet - List objects.
    
    message - The message.
    
    Returns:
    
    List objects.
  - byteToHex
```
public static String byteToHex(byte num)
```
  - decodeHexString
```
public static byte[] decodeHexString(String hexString)
```
  - hexToByte
```
public static byte hexToByte(String hexString)
```
  - toDigit
```
public static int toDigit(char hexChar)
```
  - getAddressFromEckey
```
public static String getAddressFromEckey(eu.bittrade.crypto.core.ECKey ecKey)
```
  - fromWifToEckey
```
public static eu.bittrade.crypto.core.ECKey fromWifToEckey(String wif)
```
  - fromEckeyToWif
```
public static String fromEckeyToWif(eu.bittrade.crypto.core.ECKey ecKey)
```
  - fromPrivKeyHexToWif
```
public static String fromPrivKeyHexToWif(String hexString)
```

Class BeowulfJUtils

Method Summary

Methods inherited from class java.lang.Object

Method Detail

verifyJsonString

transformShortToByteArray

transformLongToByteArray

transformByteToLittleEndian

transformStringToVarIntByteArray

transformIntToVarIntByteArray

transformShortToByteArray

transformIntToByteArray

transformBooleanToByteArray

transformLongToVarIntByteArray

transformDateToString

transformStringToTimestamp

privateKeyToWIF

setIfNotNull

setIfNotNull

setIfNotNull

setIfNotNullAndNotEmpty

byteToHex

decodeHexString

hexToByte

toDigit

getAddressFromEckey

fromWifToEckey

fromEckeyToWif

fromPrivKeyHexToWif