FeatureDefn (GDAL/OGR 3.3.0 Java bindings API)

java.lang.Object
- org.gdal.ogr.FeatureDefn

```
public class FeatureDefn
extends java.lang.Object
```
Definition of a feature class or feature layer.
The FeatureDefn class is a binding for the C++ OGRFeatureDefn class.
This object contains schema information for a set of Feature. In table based systems, a FeatureDefn is essentially a layer. In more object oriented approaches (such as SF CORBA) this can represent a class of features but doesn't necessarily relate to all of a layer, or just one layer.
This object also can contain some other information such as a name, the base geometry type and potentially other metadata.
It is reasonable for different translators to derive classes from FeatureDefn with additional translator specific information.

Constructor Summary

Constructors
Constructor Description

FeatureDefn()
Constructor.

FeatureDefn(java.lang.String name)
Constructor.

Constructors
Constructor	Description
`FeatureDefn()`	Constructor.
`FeatureDefn(java.lang.String name)`	Constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`AddFieldDefn(FieldDefn defn)`	Add a new field definition.
`void`	`AddGeomFieldDefn(GeomFieldDefn defn)`
`void`	`delete()`
`int`	`DeleteGeomFieldDefn(int idx)`
`boolean`	`equals(java.lang.Object obj)`
`int`	`GetFieldCount()`	Fetch number of fields on this feature.
`FieldDefn`	`GetFieldDefn(int ifield)`	Fetch field definition.
`int`	`GetFieldIndex(java.lang.String name)`	Find field by name.
`int`	`GetGeomFieldCount()`
`GeomFieldDefn`	`GetGeomFieldDefn(int i)`
`int`	`GetGeomFieldIndex(java.lang.String field_name)`
`int`	`GetGeomType()`	Fetch the geometry base type.
`java.lang.String`	`GetName()`	Get name of this FeatureDefn.
`int`	`GetReferenceCount()`	Fetch current reference count.
`int`	`hashCode()`
`int`	`IsGeometryIgnored()`	Determine whether the geometry can be omitted when fetching features.
`int`	`IsSame(FeatureDefn other_defn)`
`int`	`IsStyleIgnored()`	Determine whether the style can be omitted when fetching features.
`void`	`SetGeometryIgnored(int bIgnore)`	Set whether the geometry can be omitted when fetching features.
`void`	`SetGeomType(int geom_type)`	Assign the base geometry type for this layer.
`void`	`SetStyleIgnored(int bIgnore)`	Set whether the style can be omitted when fetching features.

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FeatureDefn
```
public FeatureDefn(java.lang.String name)
```
    Constructor.
    The FeatureDefn maintains a reference count, but this starts at zero. It is mainly intended to represent a count of Feature's based on this definition.
    
    Parameters:
    
    name - the name to be assigned to this layer/class. It does not need to be unique. and may be null.
    
    Since:
    
    Java bindings 1.7.0
  - FeatureDefn
```
public FeatureDefn()
```
    Constructor.
    The FeatureDefn maintains a reference count, but this starts at zero. It is mainly intended to represent a count of Feature's based on this definition. The FeatureDefn will be unnamed.
- Method Detail
  - delete
```
public void delete()
```
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Overrides:
    
    equals in class java.lang.Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - GetName
```
public java.lang.String GetName()
```
    Get name of this FeatureDefn.
    
    Returns:
    
    the name.
  - GetFieldCount
```
public int GetFieldCount()
```
    Fetch number of fields on this feature.
    
    Returns:
    
    count of fields.
  - GetFieldDefn
```
public FieldDefn GetFieldDefn(int ifield)
```
    Fetch field definition.
    
    Parameters:
    
    ifield - the field to fetch, between 0 and GetFieldCount()-1.
    
    Returns:
    
    a pointer to an internal field definition object. This object should not be modified or freed by the application.
  - GetFieldIndex
```
public int GetFieldIndex(java.lang.String name)
```
    Find field by name.
    The field index of the first field matching the passed field name (case insensitively) is returned.
    
    Parameters:
    
    name - the field name to search for.
    
    Returns:
    
    the field index, or -1 if no match found.
  - AddFieldDefn
```
public void AddFieldDefn(FieldDefn defn)
```
    Add a new field definition.
    To add a new field definition to a layer definition, do not use this function directly, but use Layer.CreateField() instead.
    This method should only be called while there are no Feature objects in existence based on this FeatureDefn. The FieldDefn passed in is copied, and remains the responsibility of the caller.
    
    Parameters:
    
    defn - the definition of the new field.
  - GetGeomFieldCount
```
public int GetGeomFieldCount()
```
  - GetGeomFieldDefn
```
public GeomFieldDefn GetGeomFieldDefn(int i)
```
  - GetGeomFieldIndex
```
public int GetGeomFieldIndex(java.lang.String field_name)
```
  - AddGeomFieldDefn
```
public void AddGeomFieldDefn(GeomFieldDefn defn)
```
  - DeleteGeomFieldDefn
```
public int DeleteGeomFieldDefn(int idx)
```
  - GetGeomType
```
public int GetGeomType()
```
    Fetch the geometry base type.
    Note that some drivers are unable to determine a specific geometry type for a layer, in which case wkbUnknown is returned. A value of wkbNone indicates no geometry is available for the layer at all. Many drivers do not properly mark the geometry type as 25D even if some or all geometries are in fact 25D. A few (broken) drivers return wkbPolygon for layers that also include wkbMultiPolygon.
    
    Returns:
    
    the base type for all geometry related to this definition.
  - SetGeomType
```
public void SetGeomType(int geom_type)
```
    Assign the base geometry type for this layer.
    All geometry objects using this type must be of the defined type or a derived type. The default upon creation is wkbUnknown which allows for any geometry type. The geometry type should generally not be changed after any Features have been created against this definition.
    
    Parameters:
    
    geom_type - the new type to assign.
  - GetReferenceCount
```
public int GetReferenceCount()
```
    Fetch current reference count.
    
    Returns:
    
    the current reference count.
  - IsGeometryIgnored
```
public int IsGeometryIgnored()
```
    Determine whether the geometry can be omitted when fetching features.
    
    Returns:
    
    ignore state (1 if ignored, 0 otherwise)
    
    Since:
    
    OGR 1.8.0
  - SetGeometryIgnored
```
public void SetGeometryIgnored(int bIgnore)
```
    Set whether the geometry can be omitted when fetching features.
    
    Parameters:
    
    bIgnore - ignore state (1 to ignore, 0 otherwise)
    
    Since:
    
    OGR 1.8.0
  - IsStyleIgnored
```
public int IsStyleIgnored()
```
    Determine whether the style can be omitted when fetching features.
    
    Returns:
    
    ignore state (1 if ignored, 0 otherwise)
    
    Since:
    
    OGR 1.8.0
  - SetStyleIgnored
```
public void SetStyleIgnored(int bIgnore)
```
    Set whether the style can be omitted when fetching features.
    
    Parameters:
    
    bIgnore - ignore state (1 to ignore, 0 otherwise)
    
    Since:
    
    OGR 1.8.0
  - IsSame
```
public int IsSame(FeatureDefn other_defn)
```

Class FeatureDefn

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

FeatureDefn

FeatureDefn

Method Detail

delete

equals

hashCode

GetName

GetFieldCount

GetFieldDefn

GetFieldIndex

AddFieldDefn

GetGeomFieldCount

GetGeomFieldDefn

GetGeomFieldIndex

AddGeomFieldDefn

DeleteGeomFieldDefn

GetGeomType

SetGeomType

GetReferenceCount

IsGeometryIgnored

SetGeometryIgnored

IsStyleIgnored

SetStyleIgnored

IsSame