uk.ac.starlink.ttools.taplint

Class JsonWriter

java.lang.Object

uk.ac.starlink.ttools.taplint.JsonWriter

public class JsonWriter
extends Object

Outputs an object as JSON. Classes List, Map, Number and Boolean are recognised. Arrays are not. If there is a non-string where a string is required, it's just forced to a string by calling its toString method.

Since:

23 Oct 2016

Author:

Mark Taylor

Constructor Summary

Constructors

Constructor and Description
JsonWriter() Constructor with default properties.
JsonWriter(int indent, boolean spacer) Custom constructor.

Method Summary

Modifier and Type	Method and Description
String	getIndent(int level) Returns prepended whitespace.
String	jsonPair(String key, Object value, int level, boolean isPositioned) Serialises a key-value pair to JSON.
String	toJson(Object item) Converts an item to JSON.
void	toJson(StringBuffer sbuf, Object item, int level, boolean isPositioned) Recursive method which does the work for conversion.

Methods inherited from class java.lang.Object

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

Constructor Detail

JsonWriter

public JsonWriter()

Constructor with default properties.

JsonWriter

public JsonWriter(int indent,
                  boolean spacer)

Custom constructor.

Parameters:

indent - number of characters indent per level

spacer - whether to put spaces inside brackets

Method Detail

toJson

public String toJson(Object item)

Converts an item to JSON.

Parameters:

item - suitable object

Returns:

JSON representation

toJson

public void toJson(StringBuffer sbuf,
                   Object item,
                   int level,
                   boolean isPositioned)

Recursive method which does the work for conversion. If possible, call this method with isPositioned=false.

Parameters:

sbuf - string buffer to append result to

item - object to convert

level - current indentation level

isPositioned - true if output should be direct to sbuf, false if it needs a newline plus indentation first

getIndent

public String getIndent(int level)

Returns prepended whitespace.

Parameters:

level - indentation level

Returns:

string to prepend

jsonPair

public String jsonPair(String key,
                       Object value,
                       int level,
                       boolean isPositioned)

Serialises a key-value pair to JSON.

Parameters:

key - key string

value - value object

level - indentation level

isPositioned - true if output should be direct to sbuf, false if it needs a newline plus indentation first

Returns:

pair representation