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	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	Description
`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`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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
equals, 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.
- 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

Class ConstructorDetector

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT

USE_PROPERTIES_BASED

USE_DELEGATING

EXPLICIT_ONLY

Method Detail

withSingleArgMode

withRequireAnnotation

withAllowJDKTypeConstructors

singleArgMode

requireCtorAnnotation

allowJDKTypeConstructors

singleArgCreatorDefaultsToDelegating

singleArgCreatorDefaultsToProperties

shouldIntrospectorImplicitConstructors