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• Summary:
Nested Field Constructor
• Method

• | Detail:
Field Constructor
• Method

• ---

  public class JsonSlurper
  extends Object 

  This has the same interface as the original JsonSlurper written for version 1.8.0, but its implementation has completely changed. It is now up to 20x faster than before, and its speed competes and often substantially exceeds popular common JSON parsers circa Jan, 2014.

  JSON slurper parses text or reader content into a data structure of lists and maps.

  Example usage:

   def slurper = new groovy.json.JsonSlurper()
   def result = slurper.parseText('{"person":{"name":"Guillaume","age":33,"pets":["dog","cat"]}}')
   assert result.person.name == "Guillaume"
   assert result.person.age == 33
   assert result.person.pets.size() == 2
   assert result.person.pets[0] == "dog"
   assert result.person.pets[1] == "cat"
   

  JsonSlurper can use several types of JSON parsers. Please read the documentation for JsonParserType. There are relaxed mode parsers, large file parser, and index overlay parsers. Don't worry, it is all groovy. JsonSlurper will just work, but understanding the different parser types may allow you to drastically improve the performance of your JSON parsing.

  Index overlay parsers (INDEX_OVERLAY and LAX) are the fastest JSON parsers. However they are not the default for a good reason. Index overlay parsers has pointers (indexes really) to original char buffer. Care must be used if putting parsed maps into a long term cache as members of map maybe index overlay objects pointing to original buffer. You can mitigate these risks by using chop and lazy chop properties.

  Chop eagerly dices up the buffer so each Value element points to a small copy of the original buffer.

  Lazy Chop dices up the buffer when a list get or map get is called so if an GPath expression or such is applied.

  You do not need chop or lazy chop if you are NOT putting the map into a long term cache. You do not need chop or lazy chop if you are doing object de-serialization. Recommendation is to use INDEX_OVERLAY for JSON buffers under 2MB. The maxSizeForInMemory is set to 2MB and any file over 2MB will use a parser designed for large files, which is slower than the INDEX_OVERLAY, LAX, and CHAR_BUFFER parsers, but faster than most commonly used JSON parsers on the JVM for most use cases circa January 2014.

  To enable the INDEX_OVERLAY parser do this:

   parser = new JsonSlurper().setType(JsonParserType.INDEX_OVERLAY);
   

  See Also:

  JsonParserType

  Since:

  1.8.0

• • Methods Summary

    Methods

    Type Params	Return Type	Name and description
    	public int	getMaxSizeForInMemory () Max size before Slurper starts to use windowing buffer parser.
    	public JsonParserType	getType () Parser type.
    	public boolean	isCheckDates () Determine if slurper will automatically parse strings it recognizes as dates.
    	public boolean	isChop () Turns on buffer chopping for index overlay.
    	public boolean	isLazyChop () Turns on buffer lazy chopping for index overlay.
    	public Object	parse (Reader reader) Parse a JSON data structure from content from a reader
    	public Object	parse (InputStream inputStream) Parse a JSON data structure from content from an inputStream
    	public Object	parse (InputStream inputStream, String charset) Parse a JSON data structure from content from an inputStream
    	public Object	parse (byte[] bytes, String charset) Parse a JSON data structure from content from a byte array.
    	public Object	parse (byte[] bytes) Parse a JSON data structure from content from a byte array.
    	public Object	parse (char[] chars) Parse a JSON data structure from content from a char array.
    	public Object	parse (Path path) Parse a JSON data structure from content within a given Path.
    	public Object	parse (Path path, String charset) Parse a JSON data structure from content within a given Path.
    	public Object	parse (File file) Parse a JSON data structure from content within a given File.
    	public Object	parse (File file, String charset) Parse a JSON data structure from content within a given File.
    	public Object	parse (URL url) Parse a JSON data structure from content at a given URL.
    	public Object	parse (URL url, Map params) Parse a JSON data structure from content at a given URL.
    	public Object	parse (Map<String, ?> params, URL url) Parse a JSON data structure from content at a given URL.
    	public Object	parse (URL url, String charset) Parse a JSON data structure from content at a given URL.
    	public Object	parse (URL url, Map params, String charset) Parse a JSON data structure from content at a given URL.
    	public Object	parse (Map params, URL url, String charset) Parse a JSON data structure from content at a given URL.
    	public Object	parseText (String text) Parse a text representation of a JSON data structure
    	public JsonSlurper	setCheckDates (boolean checkDates) Determine if slurper will automatically parse strings it recognizes as dates.
    	public JsonSlurper	setChop (boolean chop) Turns on buffer chopping for index overlay.
    	public JsonSlurper	setLazyChop (boolean lazyChop) Turns on buffer lazy chopping for index overlay.
    	public JsonSlurper	setMaxSizeForInMemory (int maxSizeForInMemory) Max size before Slurper starts to use windowing buffer parser.
    	public JsonSlurper	setType (JsonParserType type) Parser type.

  • Inherited Methods Summary

    Inherited Methods

    Methods inherited from class	Name
    class Object	equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• • Method Detail

    • public int getMaxSizeForInMemory()

      Max size before Slurper starts to use windowing buffer parser.

      Returns:

      size of file/buffer

      Since:

      2.3

    • public JsonParserType getType()

      Parser type.

      Since:

      2.3

      See Also:

      JsonParserType

      Returns:

      type

    • public boolean isCheckDates()

      Determine if slurper will automatically parse strings it recognizes as dates. Index overlay only.

      Returns:

      on or off

      Since:

      2.3

    • public boolean isChop()

      Turns on buffer chopping for index overlay.

      Since:

      2.3

      See Also:

      JsonParserType

      Returns:

      chop on or off

    • public boolean isLazyChop()

      Turns on buffer lazy chopping for index overlay.

      See Also:

      JsonParserType

      Returns:

      on or off

      Since:

      2.3

    • public Object parse(Reader reader)

      Parse a JSON data structure from content from a reader

      Parameters:

      reader - reader over a JSON content

      Returns:

      a data structure of lists and maps

    • public Object parse(InputStream inputStream)

      Parse a JSON data structure from content from an inputStream

      Parameters:

      inputStream - stream over a JSON content

      Returns:

      a data structure of lists and maps

      Since:

      2.3

    • public Object parse(InputStream inputStream, String charset)

      Parse a JSON data structure from content from an inputStream

      Parameters:

      inputStream - stream over a JSON content

      charset - charset

      Returns:

      a data structure of lists and maps

      Since:

      2.3

    • public Object parse(byte[] bytes, String charset)

      Parse a JSON data structure from content from a byte array.

      Parameters:

      bytes - buffer of JSON content

      charset - charset

      Returns:

      a data structure of lists and maps

      Since:

      2.3

    • public Object parse(byte[] bytes)

      Parse a JSON data structure from content from a byte array.

      Parameters:

      bytes - buffer of JSON content

      Returns:

      a data structure of lists and maps

      Since:

      2.3

    • public Object parse(char[] chars)

      Parse a JSON data structure from content from a char array.

      Parameters:

      chars - buffer of JSON content

      Returns:

      a data structure of lists and maps

      Since:

      2.3

    • public Object parse(Path path)

      Parse a JSON data structure from content within a given Path.

      Parameters:

      path - Path containing JSON content

      Returns:

      a data structure of lists and maps

    • public Object parse(Path path, String charset)

      Parse a JSON data structure from content within a given Path.

      Parameters:

      path - Path containing JSON content

      charset - the charset for this File

      Returns:

      a data structure of lists and maps

    • public Object parse(File file)

      Parse a JSON data structure from content within a given File.

      Parameters:

      file - File containing JSON content

      Returns:

      a data structure of lists and maps

      Since:

      2.2.0

    • public Object parse(File file, String charset)

      Parse a JSON data structure from content within a given File.

      Parameters:

      file - File containing JSON content

      charset - the charset for this File

      Returns:

      a data structure of lists and maps

      Since:

      2.2.0

    • public Object parse(URL url)

      Parse a JSON data structure from content at a given URL.

      Parameters:

      url - URL containing JSON content

      Returns:

      a data structure of lists and maps

      Since:

      2.2.0

    • public Object parse(URL url, Map params)

      Parse a JSON data structure from content at a given URL.

      Parameters:

      url - URL containing JSON content

      params - connection parameters

      Returns:

      a data structure of lists and maps

      Since:

      2.2.0

    • public Object parse(@NamedParam(value = "connectTimeout", type = Integer.class)
      @NamedParam(value = "readTimeout", type = Integer.class)
      @NamedParam(value = "useCaches", type = Boolean.class)
      @NamedParam(value = "allowUserInteraction", type = Boolean.class)
      @NamedParam(value = "requestProperties", type = Map.class)
      Map<String, ?> params, URL url)

      Parse a JSON data structure from content at a given URL. Convenience variant when using Groovy named parameters for the connection params.

      Parameters:

      params - connection parameters

      url - URL containing JSON content

      Returns:

      a data structure of lists and maps

      Since:

      2.2.0

    • public Object parse(URL url, String charset)

      Parse a JSON data structure from content at a given URL.

      Parameters:

      url - URL containing JSON content

      charset - the charset for this File

      Returns:

      a data structure of lists and maps

      Since:

      2.2.0

    • public Object parse(URL url, Map params, String charset)

      Parse a JSON data structure from content at a given URL.

      Parameters:

      url - URL containing JSON content

      params - connection parameters

      charset - the charset for this File

      Returns:

      a data structure of lists and maps

      Since:

      2.2.0

    • public Object parse(Map params, URL url, String charset)

      Parse a JSON data structure from content at a given URL. Convenience variant when using Groovy named parameters for the connection params.

      Parameters:

      params - connection parameters

      url - URL containing JSON content

      charset - the charset for this File

      Returns:

      a data structure of lists and maps

      Since:

      2.2.0

    • public Object parseText(String text)

      Parse a text representation of a JSON data structure

      Parameters:

      text - JSON text to parse

      Returns:

      a data structure of lists and maps

    • public JsonSlurper setCheckDates(boolean checkDates)

      Determine if slurper will automatically parse strings it recognizes as dates. Index overlay only.

      Returns:

      on or off

      Since:

      2.3

    • public JsonSlurper setChop(boolean chop)

      Turns on buffer chopping for index overlay.

      Since:

      2.3

      See Also:

      JsonParserType

      Returns:

      JsonSlurper

    • public JsonSlurper setLazyChop(boolean lazyChop)

      Turns on buffer lazy chopping for index overlay.

      See Also:

      JsonParserType

      Returns:

      JsonSlurper

      Since:

      2.3

    • public JsonSlurper setMaxSizeForInMemory(int maxSizeForInMemory)

      Max size before Slurper starts to use windowing buffer parser.

      Since:

      2.3

      Returns:

      JsonSlurper

    • public JsonSlurper setType(JsonParserType type)

      Parser type.

      Since:

      2.3

      See Also:

      JsonParserType

      Returns:

      JsonSlurper

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