com.google.protobuf.util

Class JsonFormat.Printer

java.lang.Object

com.google.protobuf.util.JsonFormat.Printer

Enclosing class:

JsonFormat

public static class JsonFormat.Printer
extends java.lang.Object

A Printer converts protobuf message to JSON format.

Method Summary

Modifier and Type	Method and Description
void	appendTo(MessageOrBuilder message, java.lang.Appendable output) Converts a protobuf message to JSON format.
JsonFormat.Printer	includingDefaultValueFields() Creates a new JsonFormat.Printer that will also print fields set to their defaults.
JsonFormat.Printer	includingDefaultValueFields(java.util.Set<Descriptors.FieldDescriptor> fieldsToAlwaysOutput) Creates a new JsonFormat.Printer that will also print default-valued fields if their FieldDescriptors are found in the supplied set.
JsonFormat.Printer	omittingInsignificantWhitespace() Create a new JsonFormat.Printer that will omit all insignificant whitespace in the JSON output.
JsonFormat.Printer	preservingProtoFieldNames() Creates a new JsonFormat.Printer that is configured to use the original proto field names as defined in the .proto file rather than converting them to lowerCamelCase.
java.lang.String	print(MessageOrBuilder message) Converts a protobuf message to JSON format.
JsonFormat.Printer	printingEnumsAsInts() Creates a new JsonFormat.Printer that will print enum field values as integers instead of as string.
JsonFormat.Printer	sortingMapKeys() Create a new JsonFormat.Printer that will sort the map keys in the JSON output.
JsonFormat.Printer	usingTypeRegistry(JsonFormat.TypeRegistry oldRegistry) Creates a new JsonFormat.Printer using the given registry.
JsonFormat.Printer	usingTypeRegistry(TypeRegistry registry) Creates a new JsonFormat.Printer using the given registry.

Methods inherited from class java.lang.Object

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

Method Detail

usingTypeRegistry

public JsonFormat.Printer usingTypeRegistry(JsonFormat.TypeRegistry oldRegistry)

Creates a new JsonFormat.Printer using the given registry. The new Printer clones all other configurations from the current JsonFormat.Printer.

Throws:

java.lang.IllegalArgumentException - if a registry is already set.

usingTypeRegistry

public JsonFormat.Printer usingTypeRegistry(TypeRegistry registry)

Creates a new JsonFormat.Printer using the given registry. The new Printer clones all other configurations from the current JsonFormat.Printer.

Throws:

java.lang.IllegalArgumentException - if a registry is already set.

includingDefaultValueFields

public JsonFormat.Printer includingDefaultValueFields()

Creates a new JsonFormat.Printer that will also print fields set to their defaults. Empty repeated fields and map fields will be printed as well. The new Printer clones all other configurations from the current JsonFormat.Printer.

printingEnumsAsInts

public JsonFormat.Printer printingEnumsAsInts()

Creates a new JsonFormat.Printer that will print enum field values as integers instead of as string. The new Printer clones all other configurations from the current JsonFormat.Printer.

includingDefaultValueFields

public JsonFormat.Printer includingDefaultValueFields(java.util.Set<Descriptors.FieldDescriptor> fieldsToAlwaysOutput)

Creates a new JsonFormat.Printer that will also print default-valued fields if their FieldDescriptors are found in the supplied set. Empty repeated fields and map fields will be printed as well, if they match. The new Printer clones all other configurations from the current JsonFormat.Printer. Call includingDefaultValueFields() with no args to unconditionally output all fields.

preservingProtoFieldNames

public JsonFormat.Printer preservingProtoFieldNames()

Creates a new JsonFormat.Printer that is configured to use the original proto field names as defined in the .proto file rather than converting them to lowerCamelCase. The new Printer clones all other configurations from the current JsonFormat.Printer.

omittingInsignificantWhitespace

public JsonFormat.Printer omittingInsignificantWhitespace()

Create a new JsonFormat.Printer that will omit all insignificant whitespace in the JSON output. This new Printer clones all other configurations from the current Printer. Insignificant whitespace is defined by the JSON spec as whitespace that appear between JSON structural elements:

 ws = *(
 %x20 /              ; Space
 %x09 /              ; Horizontal tab
 %x0A /              ; Line feed or New line
 %x0D )              ; Carriage return
 

See https://tools.ietf.org/html/rfc7159 current JsonFormat.Printer.

sortingMapKeys

public JsonFormat.Printer sortingMapKeys()

Create a new JsonFormat.Printer that will sort the map keys in the JSON output.

Use of this modifier is discouraged, the generated JSON messages are equivalent with and without this option set, but there are some corner use cases that demand a stable output, while order of map keys is otherwise arbitrary.

The generated order is not well-defined and should not be depended on, but it's stable.

This new Printer clones all other configurations from the current JsonFormat.Printer.

appendTo

public void appendTo(MessageOrBuilder message,
                     java.lang.Appendable output)
              throws java.io.IOException

Converts a protobuf message to JSON format.

Throws:

InvalidProtocolBufferException - if the message contains Any types that can't be resolved.

java.io.IOException - if writing to the output fails.

print

public java.lang.String print(MessageOrBuilder message)
                       throws InvalidProtocolBufferException

Converts a protobuf message to JSON format. Throws exceptions if there are unknown Any types in the message.

Throws:

InvalidProtocolBufferException