public final class ProtoUtils

Contains various utility methods to ease use of protos and increased readability in code.

Summary

Public methods
static String

Capitalizes the first char of a String.
static T
Enum> checkedGetEnumForProto(int protoEnumIndex, Class enumClass)

Maps an enum proto message type to a internal representation enum type T.
static List<Field>
getFilteredFieldList(
    Class<Object> clazz,
    List<String> targetFieldNames
)

Returns a filtered view of a class's declared Field list.

Public methods

capitalizeFirstChar

public static String capitalizeFirstChar(String aString)

Capitalizes the first char of a String.

Examples: "espresso" -> "Espresso", "Espresso" -> "Espresso"

Parameters
String aString

the String to capitalize
Returns
String

capitalized String or original String, if aString was empty

checkedGetEnumForProto

public static T Enum> checkedGetEnumForProto(int protoEnumIndex, Class enumClass)

Maps an enum proto message type to a internal representation enum type T.

Parameters
Enum>

the generic type of the enum representation
int protoEnumIndex

the proto enum index of the value returned by the unwrapped proto message
Class enumClass

the enum class to map against
Returns
T

the enum constant for a proto enum index

getFilteredFieldList

public static List<Field> getFilteredFieldList(
    Class<Object> clazz,
    List<String> targetFieldNames
)

Returns a filtered view of a class's declared Field list.

Parameters
Class<Object> clazz

the class to introspect
List<String> targetFieldNames

the field names to filter from a class Field list
Returns
List<Field>

a filtered list of class Fields
Throws
java.lang.NoSuchFieldException

if a field name does not exist in clazz