com.fasterxml.jackson.jr.ob.impl

Class ValueReaderLocator

java.lang.Object

com.fasterxml.jackson.jr.ob.impl.ValueReaderLocator

public class ValueReaderLocator
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(com.fasterxml.jackson.jr.ob.impl.JSONReader, 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 and Description
protected int	_features Feature flags that are enabled
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 ConcurrentHashMap<ClassKey,ValueReader>	_knownReaders Set of ValueReaders that we have resolved
protected JSONReader	_readContext
protected Object	_readerLock Object used for mutex during construction of a Bean deserializer: necessary to avoid race conditions during handling of cyclic dependencies.
protected ReaderWriterProvider	_readerProvider Provider for custom readers, if any; may be null.
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 often just one big instance per JVM (or at least ClassLoader).
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 Collections other than Lists
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 Lists.
static int	SER_LONG_ARRAY
static int	SER_MAP All kinds of Maps.
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 and Description
protected	ValueReaderLocator(int features, ReaderWriterProvider rwp) Constructor for the blueprint instance
protected	ValueReaderLocator(ValueReaderLocator base, int features, JSONReader r)
protected	ValueReaderLocator(ValueReaderLocator base, ReaderWriterProvider rwp)

Method Summary

Modifier and Type	Method and Description
protected int	_findSimpleType(Class<?> raw, boolean forSer)
protected POJODefinition	_resolveBeanDef(Class<?> raw)
protected BeanReader	_resolveBeanForDeser(Class<?> raw)
protected ValueReader	arrayReader(Class<?> contextType, Class<?> arrayType)
protected ValueReader	beanReader(Class<?> type)
static ValueReaderLocator	blueprint(int features, ReaderWriterProvider rwp)
protected ValueReader	collectionReader(Class<?> collectionType, ResolvedType valueType)
protected ValueReader	collectionReader(Class<?> contextType, Type collectionType)
protected ValueReader	createReader(Class<?> contextType, Class<?> type, Type genericType) Factory method for creating standard readers of any declared type.
protected ValueReader	enumReader(Class<?> enumType)
ValueReader	findReader(Class<?> raw) Method used during deserialization to find handler for given non-generic type: will first check for already resolved (and cached) readers -- and return if one found -- and then if no cached reader found, create one, cache, return.
protected ValueReader	mapReader(Class<?> mapType, ResolvedType valueType)
protected ValueReader	mapReader(Class<?> contextType, Type mapType)
ValueReaderLocator	perOperationInstance(JSONReader r, int features)
ValueReaderLocator	with(ReaderWriterProvider rwp)

Methods inherited from class java.lang.Object

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

Field Detail

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 often just one big instance per JVM (or at least ClassLoader).

See Also:

Constant Field Values

_typeResolver

protected final TypeResolver _typeResolver

For generic containers (Collections, Maps, arrays), we may need this guy.

_readerProvider

protected final ReaderWriterProvider _readerProvider

Provider for custom readers, if any; may be null.

Since:

2.10

_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

Object used for mutex during construction of a Bean deserializer: necessary to avoid race conditions during handling of cyclic dependencies.

_features

protected final int _features

Feature flags that are enabled

_readContext

protected final JSONReader _readContext

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

Constructor Detail

ValueReaderLocator

protected ValueReaderLocator(int features,
                             ReaderWriterProvider rwp)

Constructor for the blueprint instance

ValueReaderLocator

protected ValueReaderLocator(ValueReaderLocator base,
                             int features,
                             JSONReader r)

ValueReaderLocator

protected ValueReaderLocator(ValueReaderLocator base,
                             ReaderWriterProvider rwp)

Method Detail

blueprint

public static final ValueReaderLocator blueprint(int features,
                                                 ReaderWriterProvider rwp)

with

public ValueReaderLocator with(ReaderWriterProvider rwp)

perOperationInstance

public ValueReaderLocator perOperationInstance(JSONReader r,
                                               int features)

findReader

public ValueReader findReader(Class<?> raw)

Method used during deserialization to find handler for given non-generic type: will first check for already resolved (and cached) readers -- and return if one found -- and then if no cached reader found, create one, cache, return.

Parameters:

raw - Type-erased type of value to find reader for

Returns:

ValueReader to use for given type

createReader

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

Factory method for creating standard readers of any declared type.

Parameters:

contextType - Context for resolving generic type parameters

type - Type-erased type of value to construct reader for

genericType - Full (possibly) generic type of value to construct reader for (important for Map, Collection).

arrayReader

protected ValueReader arrayReader(Class<?> contextType,
                                  Class<?> arrayType)

enumReader

protected 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)

beanReader

protected ValueReader beanReader(Class<?> type)

_resolveBeanForDeser

protected BeanReader _resolveBeanForDeser(Class<?> raw)

_resolveBeanDef

protected POJODefinition _resolveBeanDef(Class<?> raw)

_findSimpleType

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