DupDetector (Jackson-core 2.10.2 API)

java.lang.Object
- com.fasterxml.jackson.core.json.DupDetector

```
public class DupDetector
extends Object
```
Helper class used if JsonParser.Feature.STRICT_DUPLICATE_DETECTION is enabled. Optimized to try to limit memory usage and processing overhead for smallest entries, but without adding trashing (immutable objects would achieve optimal memory usage but lead to significant number of discarded temp objects for scopes with large number of entries). Another consideration is trying to limit actual number of compiled classes as it contributes significantly to overall jar size (due to linkage etc).

Since:

2.3

Field Summary

Fields
Modifier and Type	Field	Description
`protected String`	`_firstName`
`protected String`	`_secondName`
`protected HashSet<String>`	`_seen`	Lazily constructed set of names already seen within this context.
`protected Object`	`_source`	We need to store a back-reference here to parser/generator.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`DupDetector`	`child()`
`JsonLocation`	`findLocation()`
`Object`	`getSource()`
`boolean`	`isDup(String name)`
`void`	`reset()`
`static DupDetector`	`rootDetector(JsonGenerator g)`
`static DupDetector`	`rootDetector(JsonParser p)`

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

Field Detail
- _source
```
protected final Object _source
```
  We need to store a back-reference here to parser/generator.
- _firstName
```
protected String _firstName
```
- _secondName
```
protected String _secondName
```
- _seen
```
protected HashSet<String> _seen
```
  Lazily constructed set of names already seen within this context.

Method Detail

rootDetector

public static DupDetector rootDetector(JsonParser p)

rootDetector

public static DupDetector rootDetector(JsonGenerator g)

child
```
public DupDetector child()
```

reset
```
public void reset()
```

findLocation
```
public JsonLocation findLocation()
```

getSource
```
public Object getSource()
```
Since:

2.7

isDup

public boolean isDup(String name)
              throws JsonParseException

Throws:: JsonParseException