Package com.fasterxml.jackson.core

Interface PrettyPrinter

All Known Implementing Classes:

DefaultPrettyPrinter, MinimalPrettyPrinter

public interface PrettyPrinter

Interface for objects that implement pretty printer functionality, such as indentation. Pretty printers are used to add white space in output JSON content, to make results more human readable. Usually this means things like adding linefeeds and indentation.

Note: since Jackson 2.1, stateful implementations MUST implement Instantiatable interface, to allow for constructing per-generation instances and avoid state corruption. Stateless implementations need not do this; but those are less common.

Field Summary

Fields

Modifier and Type	Field	Description
static SerializedString	DEFAULT_ROOT_VALUE_SEPARATOR	Default String used for separating root values is single space.
static Separators	DEFAULT_SEPARATORS

Method Summary

Modifier and Type	Method	Description
void	beforeArrayValues(JsonGenerator gen)	Method called after array start marker has been output, and right before the first value is to be output.
void	beforeObjectEntries(JsonGenerator gen)	Method called after object start marker has been output, and right before the field name of the first entry is to be output.
void	writeArrayValueSeparator(JsonGenerator gen)	Method called after an array value has been completely output, and before another value is to be output.
void	writeEndArray(JsonGenerator gen, int nrOfValues)	Method called after an Array value has been completely output (minus closing bracket).
void	writeEndObject(JsonGenerator gen, int nrOfEntries)	Method called after an Object value has been completely output (minus closing curly bracket).
void	writeObjectEntrySeparator(JsonGenerator gen)	Method called after an Object entry (field:value) has been completely output, and before another value is to be output.
void	writeObjectFieldValueSeparator(JsonGenerator gen)	Method called after an object field has been output, but before the value is output.
void	writeRootValueSeparator(JsonGenerator gen)	Method called after a root-level value has been completely output, and before another value is to be output.
void	writeStartArray(JsonGenerator gen)	Method called when an Array value is to be output, before any member/child values are output.
void	writeStartObject(JsonGenerator gen)	Method called when an Object value is to be output, before any fields are output.

Field Detail

DEFAULT_SEPARATORS

static final Separators DEFAULT_SEPARATORS

Since:

2.9

DEFAULT_ROOT_VALUE_SEPARATOR

static final SerializedString DEFAULT_ROOT_VALUE_SEPARATOR

Default String used for separating root values is single space.

Since:

2.9

Method Detail

writeRootValueSeparator

void writeRootValueSeparator(JsonGenerator gen)
                      throws java.io.IOException

Method called after a root-level value has been completely output, and before another value is to be output.

Default handling (without pretty-printing) will output a space, to allow values to be parsed correctly. Pretty-printer is to output some other suitable and nice-looking separator (tab(s), space(s), linefeed(s) or any combination thereof).

Parameters:

gen - Generator used for output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer

writeStartObject

void writeStartObject(JsonGenerator gen)
               throws java.io.IOException

Method called when an Object value is to be output, before any fields are output.

Default handling (without pretty-printing) will output the opening curly bracket. Pretty-printer is to output a curly bracket as well, but can surround that with other (white-space) decoration.

Parameters:

gen - Generator used for output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer

writeEndObject

void writeEndObject(JsonGenerator gen,
                    int nrOfEntries)
             throws java.io.IOException

Method called after an Object value has been completely output (minus closing curly bracket).

Default handling (without pretty-printing) will output the closing curly bracket. Pretty-printer is to output a curly bracket as well, but can surround that with other (white-space) decoration.

Parameters:

gen - Generator used for output

nrOfEntries - Number of direct members of the Object that have been output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer

writeObjectEntrySeparator

void writeObjectEntrySeparator(JsonGenerator gen)
                        throws java.io.IOException

Method called after an Object entry (field:value) has been completely output, and before another value is to be output.

Default handling (without pretty-printing) will output a single comma to separate the two. Pretty-printer is to output a comma as well, but can surround that with other (white-space) decoration.

Parameters:

gen - Generator used for output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer

writeObjectFieldValueSeparator

void writeObjectFieldValueSeparator(JsonGenerator gen)
                             throws java.io.IOException

Method called after an object field has been output, but before the value is output.

Default handling (without pretty-printing) will output a single colon to separate the two. Pretty-printer is to output a colon as well, but can surround that with other (white-space) decoration.

Parameters:

gen - Generator used for output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer

writeStartArray

void writeStartArray(JsonGenerator gen)
              throws java.io.IOException

Method called when an Array value is to be output, before any member/child values are output.

Default handling (without pretty-printing) will output the opening bracket. Pretty-printer is to output a bracket as well, but can surround that with other (white-space) decoration.

Parameters:

gen - Generator used for output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer

writeEndArray

void writeEndArray(JsonGenerator gen,
                   int nrOfValues)
            throws java.io.IOException

Method called after an Array value has been completely output (minus closing bracket).

Default handling (without pretty-printing) will output the closing bracket. Pretty-printer is to output a bracket as well, but can surround that with other (white-space) decoration.

Parameters:

gen - Generator used for output

nrOfValues - Number of direct members of the array that have been output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer

writeArrayValueSeparator

void writeArrayValueSeparator(JsonGenerator gen)
                       throws java.io.IOException

Method called after an array value has been completely output, and before another value is to be output.

Default handling (without pretty-printing) will output a single comma to separate the two. Pretty-printer is to output a comma as well, but can surround that with other (white-space) decoration.

Parameters:

gen - Generator used for output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer

beforeArrayValues

void beforeArrayValues(JsonGenerator gen)
                throws java.io.IOException

Method called after array start marker has been output, and right before the first value is to be output. It is not called for arrays with no values.

Default handling does not output anything, but pretty-printer is free to add any white space decoration.

Parameters:

gen - Generator used for output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer

beforeObjectEntries

void beforeObjectEntries(JsonGenerator gen)
                  throws java.io.IOException

Method called after object start marker has been output, and right before the field name of the first entry is to be output. It is not called for objects without entries.

Default handling does not output anything, but pretty-printer is free to add any white space decoration.

Parameters:

gen - Generator used for output

Throws:

java.io.IOException - if there is either an underlying I/O problem or encoding issue at format layer