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## com.fasterxml.jackson.core.io
Class JsonStringEncoder

    java.lang.Object
      com.fasterxml.jackson.core.io.JsonStringEncoder

    public final class JsonStringEncoder

extends Object

Helper class used for efficient encoding of JSON String values (including JSON field names) into Strings or UTF-8 byte arrays.

Note that methods in here are somewhat optimized, but not ridiculously so. Reason is that conversion method results are expected to be cached so that these methods will not be hot spots during normal operation.

Field Summary
`protected ByteArrayBuilder` | `_byteBuilder` Lazily-constructed builder used for UTF-8 encoding of text values (quoted and unquoted)
`protected char[]` | `_quoteBuffer` Temporary buffer used for composing quote/escape sequences
`protected TextBuffer` | `_textBuffer` Lazily constructed text buffer used to produce JSON encoded Strings as characters (without UTF-8 encoding)
`protected static ThreadLocal<SoftReference<JsonStringEncoder>>` | `_threadEncoder` This `ThreadLocal` contains a `SoftReference` to a `BufferRecycler` used to provide a low-cost buffer recycling between reader and writer instances.

Constructor Summary
`JsonStringEncoder()`

Method Summary
`byte[]` | `encodeAsUTF8(String text)` Will encode given String as UTF-8 (without any quoting), return resulting byte array.
`static JsonStringEncoder` | `getInstance()` Factory method for getting an instance; this is either recycled per-thread instance, or a newly constructed one.
`char[]` | `quoteAsString(String input)` Method that will quote text contents using JSON standard quoting, and return results as a character array
`byte[]` | `quoteAsUTF8(String text)` Will quote given JSON String value using standard quoting, encode results as UTF-8, and return result as a byte array.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### _threadEncoder

    protected static final ThreadLocal<SoftReference<JsonStringEncoder>> _threadEncoder

  This `ThreadLocal` contains a `SoftReference` to a `BufferRecycler` used to provide a low-cost buffer recycling between reader and writer instances.

### _textBuffer

    protected TextBuffer _textBuffer

  Lazily constructed text buffer used to produce JSON encoded Strings as characters (without UTF-8 encoding)

### _byteBuilder

    protected ByteArrayBuilder _byteBuilder

  Lazily-constructed builder used for UTF-8 encoding of text values (quoted and unquoted)

### _quoteBuffer

    protected final char[] _quoteBuffer

  Temporary buffer used for composing quote/escape sequences

Constructor Detail

### JsonStringEncoder

    public JsonStringEncoder()

Method Detail

### getInstance

    public static JsonStringEncoder getInstance()

  Factory method for getting an instance; this is either recycled per-thread instance, or a newly constructed one.

### quoteAsString

    public char[] quoteAsString(String input)

  Method that will quote text contents using JSON standard quoting, and return results as a character array

### quoteAsUTF8

    public byte[] quoteAsUTF8(String text)

  Will quote given JSON String value using standard quoting, encode results as UTF-8, and return result as a byte array.

### encodeAsUTF8

    public byte[] encodeAsUTF8(String text)

  Will encode given String as UTF-8 (without any quoting), return resulting byte array.

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