com.fasterxml.jackson.databind.cfg

Class ConstructorDetector

java.lang.Object

com.fasterxml.jackson.databind.cfg.ConstructorDetector

All Implemented Interfaces:

Serializable

public final class ConstructorDetector
extends Object
implements Serializable

Configurable handler used to select aspects of selecting constructor to use as "Creator" for POJOs. Defines the API for handlers, a pre-defined set of standard instances and methods for constructing alternative configurations.

Since:

2.12

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type

Class and Description

static class

ConstructorDetector.SingleArgConstructor Definition of alternate handling modes of single-argument constructors that are annotated with JsonCreator but without "mode" definition (or explicit name for the argument): this is the case where two interpretations are possible -- "properties" (in which case the argument is named parameter of a JSON Object) and "delegating (in which case the argument maps to the whole JSON value).

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	_allowJDKTypeCtors Whether auto-detection of constructors of "JDK types" (those in packages java. and javax.) is allowed or not
protected boolean	_requireCtorAnnotation Whether explicit JsonCreator is always required for detecting constructors (even if visible) other than the default (no argument) constructor.
protected ConstructorDetector.SingleArgConstructor	_singleArgMode
static ConstructorDetector	DEFAULT Instance used by default, which: Uses ConstructorDetector.SingleArgConstructor.HEURISTIC for single-argument constructor case Does not require explicit @JsonCreator annotations (so allows auto-detection of Visible constructors} (except for JDK types) Does not allow auto-detection of Visible constructors for so-called JDK types; that is, classes in packages java.* and javax.*
static ConstructorDetector	EXPLICIT_ONLY Instance similar to DEFAULT except that for single-argument case uses setting of ConstructorDetector.SingleArgConstructor.REQUIRE_MODE.
static ConstructorDetector	USE_DELEGATING Instance similar to DEFAULT except that for single-argument case uses setting of ConstructorDetector.SingleArgConstructor.DELEGATING.
static ConstructorDetector	USE_PROPERTIES_BASED Instance similar to DEFAULT except that for single-argument case uses setting of ConstructorDetector.SingleArgConstructor.PROPERTIES.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ConstructorDetector(ConstructorDetector.SingleArgConstructor singleArgMode) Constructors used for default configurations which only varies by _singleArgMode
protected	ConstructorDetector(ConstructorDetector.SingleArgConstructor singleArgMode, boolean requireCtorAnnotation, boolean allowJDKTypeCtors)

Method Summary

Modifier and Type	Method and Description
boolean	allowJDKTypeConstructors()
boolean	requireCtorAnnotation()
boolean	shouldIntrospectorImplicitConstructors(Class<?> rawType) Accessor that combines checks for whether implicit creators are allowed and, if so, whether JDK type constructors are allowed (if type is JDK type) to determine whether implicit constructor detection should be enabled for given type or not.
boolean	singleArgCreatorDefaultsToDelegating()
boolean	singleArgCreatorDefaultsToProperties()
ConstructorDetector.SingleArgConstructor	singleArgMode()
ConstructorDetector	withAllowJDKTypeConstructors(boolean state)
ConstructorDetector	withRequireAnnotation(boolean state)
ConstructorDetector	withSingleArgMode(ConstructorDetector.SingleArgConstructor singleArgMode)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT

public static final ConstructorDetector DEFAULT

Instance used by default, which:

• Uses ConstructorDetector.SingleArgConstructor.HEURISTIC for single-argument constructor case
• Does not require explicit @JsonCreator annotations (so allows auto-detection of Visible constructors} (except for JDK types)
• Does not allow auto-detection of Visible constructors for so-called JDK types; that is, classes in packages java.* and javax.*

USE_PROPERTIES_BASED

public static final ConstructorDetector USE_PROPERTIES_BASED

Instance similar to DEFAULT except that for single-argument case uses setting of ConstructorDetector.SingleArgConstructor.PROPERTIES.

USE_DELEGATING

public static final ConstructorDetector USE_DELEGATING

Instance similar to DEFAULT except that for single-argument case uses setting of ConstructorDetector.SingleArgConstructor.DELEGATING.

EXPLICIT_ONLY

public static final ConstructorDetector EXPLICIT_ONLY

Instance similar to DEFAULT except that for single-argument case uses setting of ConstructorDetector.SingleArgConstructor.REQUIRE_MODE.

_singleArgMode

protected final ConstructorDetector.SingleArgConstructor _singleArgMode

_requireCtorAnnotation

protected final boolean _requireCtorAnnotation

Whether explicit JsonCreator is always required for detecting constructors (even if visible) other than the default (no argument) constructor.

_allowJDKTypeCtors

protected final boolean _allowJDKTypeCtors

Whether auto-detection of constructors of "JDK types" (those in packages java. and javax.) is allowed or not

Constructor Detail

ConstructorDetector

protected ConstructorDetector(ConstructorDetector.SingleArgConstructor singleArgMode,
                              boolean requireCtorAnnotation,
                              boolean allowJDKTypeCtors)

ConstructorDetector

protected ConstructorDetector(ConstructorDetector.SingleArgConstructor singleArgMode)

Constructors used for default configurations which only varies by _singleArgMode

Method Detail

withSingleArgMode

public ConstructorDetector withSingleArgMode(ConstructorDetector.SingleArgConstructor singleArgMode)

withRequireAnnotation

public ConstructorDetector withRequireAnnotation(boolean state)

withAllowJDKTypeConstructors

public ConstructorDetector withAllowJDKTypeConstructors(boolean state)

singleArgMode

public ConstructorDetector.SingleArgConstructor singleArgMode()

requireCtorAnnotation

public boolean requireCtorAnnotation()

allowJDKTypeConstructors

public boolean allowJDKTypeConstructors()

singleArgCreatorDefaultsToDelegating

public boolean singleArgCreatorDefaultsToDelegating()

singleArgCreatorDefaultsToProperties

public boolean singleArgCreatorDefaultsToProperties()

shouldIntrospectorImplicitConstructors

public boolean shouldIntrospectorImplicitConstructors(Class<?> rawType)

Accessor that combines checks for whether implicit creators are allowed and, if so, whether JDK type constructors are allowed (if type is JDK type) to determine whether implicit constructor detection should be enabled for given type or not.

Parameters:

rawType - Value type to consider

Returns:

True if implicit constructor detection should be enabled; false if not