java.lang.Object
- com.fasterxml.jackson.jr.ob.impl.TypeDetector

```
public class TypeDetector
extends Object
```
Helper object used for efficient detection of type information relevant to our conversion needs when writing out Java Objects as JSON.
Note that usage pattern is such that a single "root" instance is kept by each JSON instance; and an actual per-operation instance must be constructed by calling perOperationInstance(int): reason for this is that instances use simple caching to handle the common case of repeating types within JSON Arrays.

Field Summary

Fields
Modifier and Type	Field	Description
`protected int`	`_features`
`protected Map<ClassKey,ValueReader>`	`_incompleteReaders`	During resolution, some readers may be in-progress, but need to be linked: for example, with cyclic type references.
`protected ClassKey`	`_key`	Reusable lookup key; only used by per-thread instances.
`protected ConcurrentHashMap<ClassKey,ValueReader>`	`_knownReaders`	Set of `ValueReader`s that we have resolved
`protected ConcurrentHashMap<ClassKey,Integer>`	`_knownSerTypes`	Mapping from classes to resolved type constants or indexes, to use for serialization.
`protected CopyOnWriteArrayList<BeanPropertyWriter[]>`	`_knownWriters`
`protected Class<?>`	`_prevClass`
`protected int`	`_prevType`
`protected Object`	`_readerLock`
`protected TypeResolver`	`_typeResolver`	For generic containers (Collections, Maps, arrays), we may need this guy.
`protected static int`	`CACHE_FLAGS`
`protected static int`	`MAX_CACHED_READERS`	While we should be able to cache all types in the active working set, we should also avoid potential unbounded retention, since there is generally just one big `TypeDetector` instances per JVM (or at least ClassLoader).
`protected BeanPropertyWriter[]`	`NO_PROPS_FOR_WRITE`
`static int`	`SER_BOOLEAN`
`static int`	`SER_BOOLEAN_ARRAY`
`static int`	`SER_BYTE_ARRAY`
`static int`	`SER_CALENDAR`
`static int`	`SER_CHAR`
`static int`	`SER_CHAR_ARRAY`
`static int`	`SER_CHARACTER_SEQUENCE`
`static int`	`SER_CLASS`
`static int`	`SER_COLLECTION`	All kinds of `Collection`s other than `List`s
`static int`	`SER_DATE`
`static int`	`SER_ENUM`
`static int`	`SER_FILE`
`static int`	`SER_INT_ARRAY`
`static int`	`SER_ITERABLE`	Anything that implements `Iterable`, but not `Collection`.
`static int`	`SER_LIST`	All kinds of `List`s.
`static int`	`SER_LONG_ARRAY`
`static int`	`SER_MAP`	All kinds of `Map`s.
`static int`	`SER_NUMBER_BIG_DECIMAL`
`static int`	`SER_NUMBER_BIG_INTEGER`
`static int`	`SER_NUMBER_BYTE`
`static int`	`SER_NUMBER_DOUBLE`
`static int`	`SER_NUMBER_FLOAT`
`static int`	`SER_NUMBER_INTEGER`
`static int`	`SER_NUMBER_LONG`
`static int`	`SER_NUMBER_SHORT`
`static int`	`SER_OBJECT_ARRAY`	Arrays of non-primitive types
`static int`	`SER_STRING`
`static int`	`SER_TREE_NODE`	An implementation of `TreeNode`
`static int`	`SER_UNKNOWN`	Type not yet resolved
`static int`	`SER_URI`
`static int`	`SER_URL`
`static int`	`SER_UUID`

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`TypeDetector(int features)`	Constructor for the blueprint instance
`protected`	`TypeDetector(TypeDetector base, int features)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected int`	`_findPOJOSerializationType(Class<?> raw)`
`protected int`	`_findSimple(Class<?> raw, boolean forSer)`
`protected BeanReader`	`_resolveBeanForDeser(Class<?> raw)`
`static TypeDetector`	`blueprint(int features)`
`protected ValueReader`	`collectionReader(Class<?> collectionType, ResolvedType valueType)`
`protected ValueReader`	`collectionReader(Class<?> contextType, Type collectionType)`
`protected ValueReader`	`createReader(Class<?> contextType, Class<?> type, Type genericType)`
`ValueReader`	`enumReader(Class<?> enumType)`
`ValueReader`	`findReader(Class<?> raw)`	Method used during deserialization to find handler for given non-generic type.
`int`	`findSerializationType(Class<?> raw)`	The main lookup method used to find type identifier for given raw class; including Bean types (if allowed).
`BeanPropertyWriter[]`	`getPropertyWriters(int index)`
`protected ValueReader`	`mapReader(Class<?> mapType, ResolvedType valueType)`
`protected ValueReader`	`mapReader(Class<?> contextType, Type mapType)`
`TypeDetector`	`perOperationInstance(int features)`
`protected BeanPropertyWriter[]`	`resolveBeanForSer(Class<?> raw, POJODefinition classDef)`
`protected POJODefinition`	`resolvePOJODefinition(Class<?> raw)`

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

Field Detail
- NO_PROPS_FOR_WRITE
```
protected final BeanPropertyWriter[] NO_PROPS_FOR_WRITE
```
- MAX_CACHED_READERS
```
protected static final int MAX_CACHED_READERS
```
  While we should be able to cache all types in the active working set, we should also avoid potential unbounded retention, since there is generally just one big `TypeDetector` instances per JVM (or at least ClassLoader).
  
  See Also:
  
  Constant Field Values
- SER_UNKNOWN
```
public static final int SER_UNKNOWN
```
  Type not yet resolved
  
  See Also:
  
  Constant Field Values
- SER_MAP
```
public static final int SER_MAP
```
  All kinds of Maps.
  
  See Also:
  
  Constant Field Values
- SER_LIST
```
public static final int SER_LIST
```
  All kinds of Lists.
  
  See Also:
  
  Constant Field Values
- SER_COLLECTION
```
public static final int SER_COLLECTION
```
  All kinds of Collections other than Lists
  
  See Also:
  
  Constant Field Values
- SER_OBJECT_ARRAY
```
public static final int SER_OBJECT_ARRAY
```
  Arrays of non-primitive types
  
  See Also:
  
  Constant Field Values
- SER_INT_ARRAY
```
public static final int SER_INT_ARRAY
```
  See Also:
  
  Constant Field Values
- SER_LONG_ARRAY
```
public static final int SER_LONG_ARRAY
```
  See Also:
  
  Constant Field Values
- SER_BOOLEAN_ARRAY
```
public static final int SER_BOOLEAN_ARRAY
```
  See Also:
  
  Constant Field Values
- SER_TREE_NODE
```
public static final int SER_TREE_NODE
```
  An implementation of TreeNode
  
  See Also:
  
  Constant Field Values
- SER_STRING
```
public static final int SER_STRING
```
  See Also:
  
  Constant Field Values
- SER_CHARACTER_SEQUENCE
```
public static final int SER_CHARACTER_SEQUENCE
```
  See Also:
  
  Constant Field Values
- SER_CHAR_ARRAY
```
public static final int SER_CHAR_ARRAY
```
  See Also:
  
  Constant Field Values
- SER_BYTE_ARRAY
```
public static final int SER_BYTE_ARRAY
```
  See Also:
  
  Constant Field Values
- SER_NUMBER_BYTE
```
public static final int SER_NUMBER_BYTE
```
  See Also:
  
  Constant Field Values
- SER_NUMBER_SHORT
```
public static final int SER_NUMBER_SHORT
```
  See Also:
  
  Constant Field Values
- SER_NUMBER_INTEGER
```
public static final int SER_NUMBER_INTEGER
```
  See Also:
  
  Constant Field Values
- SER_NUMBER_LONG
```
public static final int SER_NUMBER_LONG
```
  See Also:
  
  Constant Field Values
- SER_NUMBER_FLOAT
```
public static final int SER_NUMBER_FLOAT
```
  See Also:
  
  Constant Field Values
- SER_NUMBER_DOUBLE
```
public static final int SER_NUMBER_DOUBLE
```
  See Also:
  
  Constant Field Values
- SER_NUMBER_BIG_INTEGER
```
public static final int SER_NUMBER_BIG_INTEGER
```
  See Also:
  
  Constant Field Values
- SER_NUMBER_BIG_DECIMAL
```
public static final int SER_NUMBER_BIG_DECIMAL
```
  See Also:
  
  Constant Field Values
- SER_BOOLEAN
```
public static final int SER_BOOLEAN
```
  See Also:
  
  Constant Field Values
- SER_CHAR
```
public static final int SER_CHAR
```
  See Also:
  
  Constant Field Values
- SER_ENUM
```
public static final int SER_ENUM
```
  See Also:
  
  Constant Field Values
- SER_DATE
```
public static final int SER_DATE
```
  See Also:
  
  Constant Field Values
- SER_CALENDAR
```
public static final int SER_CALENDAR
```
  See Also:
  
  Constant Field Values
- SER_CLASS
```
public static final int SER_CLASS
```
  See Also:
  
  Constant Field Values
- SER_FILE
```
public static final int SER_FILE
```
  See Also:
  
  Constant Field Values
- SER_UUID
```
public static final int SER_UUID
```
  See Also:
  
  Constant Field Values
- SER_URL
```
public static final int SER_URL
```
  See Also:
  
  Constant Field Values
- SER_URI
```
public static final int SER_URI
```
  See Also:
  
  Constant Field Values
- SER_ITERABLE
```
public static final int SER_ITERABLE
```
  Anything that implements Iterable, but not Collection.
  
  See Also:
  
  Constant Field Values
- CACHE_FLAGS
```
protected static final int CACHE_FLAGS
```
- _knownSerTypes
```
protected final ConcurrentHashMap<ClassKey,Integer> _knownSerTypes
```
  Mapping from classes to resolved type constants or indexes, to use for serialization.
- _knownWriters
```
protected final CopyOnWriteArrayList<BeanPropertyWriter[]> _knownWriters
```
- _typeResolver
```
protected final TypeResolver _typeResolver
```
  For generic containers (Collections, Maps, arrays), we may need this guy.
- _knownReaders
```
protected final ConcurrentHashMap<ClassKey,ValueReader> _knownReaders
```
  Set of ValueReaders that we have resolved
- _incompleteReaders
```
protected Map<ClassKey,ValueReader> _incompleteReaders
```
  During resolution, some readers may be in-progress, but need to be linked: for example, with cyclic type references.
- _readerLock
```
protected final Object _readerLock
```
- _key
```
protected ClassKey _key
```
  Reusable lookup key; only used by per-thread instances.
- _prevClass
```
protected Class<?> _prevClass
```
- _prevType
```
protected int _prevType
```
- _features
```
protected int _features
```

Constructor Detail

TypeDetector
```
protected TypeDetector(int features)
```
Constructor for the blueprint instance

TypeDetector

protected TypeDetector(TypeDetector base,
                       int features)

Method Detail

blueprint

public static final TypeDetector blueprint(int features)

perOperationInstance

public TypeDetector perOperationInstance(int features)

resolvePOJODefinition

protected POJODefinition resolvePOJODefinition(Class<?> raw)

_findSimple

protected int _findSimple(Class<?> raw,
                          boolean forSer)

getPropertyWriters

public BeanPropertyWriter[] getPropertyWriters(int index)

findSerializationType
```
public final int findSerializationType(Class<?> raw)
```
The main lookup method used to find type identifier for given raw class; including Bean types (if allowed).

_findPOJOSerializationType

protected int _findPOJOSerializationType(Class<?> raw)

resolveBeanForSer

protected BeanPropertyWriter[] resolveBeanForSer(Class<?> raw,
                                                 POJODefinition classDef)

enumReader

public ValueReader enumReader(Class<?> enumType)

collectionReader

protected ValueReader collectionReader(Class<?> contextType,
                                       Type collectionType)

collectionReader

protected ValueReader collectionReader(Class<?> collectionType,
                                       ResolvedType valueType)

mapReader

protected ValueReader mapReader(Class<?> contextType,
                                Type mapType)

mapReader

protected ValueReader mapReader(Class<?> mapType,
                                ResolvedType valueType)

findReader
```
public ValueReader findReader(Class<?> raw)
```
Method used during deserialization to find handler for given non-generic type.

createReader

protected ValueReader createReader(Class<?> contextType,
                                   Class<?> type,
                                   Type genericType)

_resolveBeanForDeser

protected BeanReader _resolveBeanForDeser(Class<?> raw)

Class TypeDetector

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

NO_PROPS_FOR_WRITE

MAX_CACHED_READERS

SER_UNKNOWN

SER_MAP

SER_LIST

SER_COLLECTION

SER_OBJECT_ARRAY

SER_INT_ARRAY

SER_LONG_ARRAY

SER_BOOLEAN_ARRAY

SER_TREE_NODE

SER_STRING

SER_CHARACTER_SEQUENCE

SER_CHAR_ARRAY

SER_BYTE_ARRAY

SER_NUMBER_BYTE

SER_NUMBER_SHORT

SER_NUMBER_INTEGER

SER_NUMBER_LONG

SER_NUMBER_FLOAT

SER_NUMBER_DOUBLE

SER_NUMBER_BIG_INTEGER

SER_NUMBER_BIG_DECIMAL

SER_BOOLEAN

SER_CHAR

SER_ENUM

SER_DATE

SER_CALENDAR

SER_CLASS

SER_FILE

SER_UUID

SER_URL

SER_URI

SER_ITERABLE

CACHE_FLAGS

_knownSerTypes

_knownWriters

_typeResolver

_knownReaders

_incompleteReaders

_readerLock

_key

_prevClass

_prevType

_features

Constructor Detail

TypeDetector

TypeDetector

Method Detail

blueprint

perOperationInstance

resolvePOJODefinition

_findSimple

getPropertyWriters

findSerializationType

_findPOJOSerializationType

resolveBeanForSer

enumReader

collectionReader

collectionReader

mapReader

mapReader

findReader

createReader

_resolveBeanForDeser