Package uk.ac.starlink.ttools.taplint

Class JsonWriter

  • public class JsonWriter
extends java.lang.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 Description
      JsonWriter()
      Constructor with default properties.
      JsonWriter​(int indent, boolean spacer)
      Custom constructor.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.String getIndent​(int level)
      Returns prepended whitespace.
      java.lang.String jsonPair​(java.lang.String key, java.lang.Object value, int level, boolean isPositioned)
      Serialises a key-value pair to JSON.
      java.lang.String toJson​(java.lang.Object item)
      Converts an item to JSON.
      void toJson​(java.lang.StringBuffer sbuf, java.lang.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 java.lang.String toJson​(java.lang.Object item)
        Converts an item to JSON.
        Parameters:
        item - suitable object
        Returns:
        JSON representation

      • toJson

        public void toJson​(java.lang.StringBuffer sbuf,
                   java.lang.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 java.lang.String getIndent​(int level)
        Returns prepended whitespace.
        Parameters:
        level - indentation level
        Returns:
        string to prepend

      • jsonPair

        public java.lang.String jsonPair​(java.lang.String key,
                                 java.lang.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