Schema.Field (TIBCO StreamBase Java API)

java.lang.Object
- com.streambase.sb.Schema.Field

All Implemented Interfaces:

Serializable

Enclosing class:

Schema
```
public static class Schema.Field
extends Object
implements Serializable
```
Information (name, type, and optionally size) about a field in a Schema.
A field can be looked up within a schema in three ways:
1. By index: By the zero-based ordinal position of the field within the schema
2. By simple name: By the name of the field itself (e.g., "myint")
3. By path name: By a dot-separated list of names that define a path through a set of nested schemas that arise through the use of fields of type Tuple (e.g., "mynestedtuple.myint").
A Field object can be used to obtain the value of a field in a tuple. However, there are rules that must be obeyed in doing so. For example, one must obtain the Field object from a Schema object that describes the schema of the tuple (i.e., as opposed to directly from a Field constructor).
See the "client" StreamBase sample (streambase-install-dir/sample/client) for examples of proper use of Field objects.
Note: Serializations of instances of this class that are created (e.g., by using ObjectOutputStream) in one version of StreamBase in general will not be deserializable in any other version of StreamBase.
See Also:

Serialized Form

Constructor Summary

Constructors
Constructor and Description
`Field(Schema.Field field)` Construct a Field from an existing Field.
`Field(String name, CompleteDataType completeType, com.streambase.sb.util.Location loc)`
`Field(String name, DataType dataType)` Deprecated. Use `Schema.createField(DataType, String)` instead
`Field(String name, DataType dataType, Schema s)` Deprecated. Use `Schema.Field#Field(String, CompleteDataType)` instead with new Schema(name, CompleteDataType.forTuple(s)), or `Schema.createTupleField(String, Schema)`
`Field(String name, Schema.Field field)` Construct a Field from an existing Field, giving the new field a specified name

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`void`	`checkType(CompleteDataType dataType)` Check to make sure that the given type is the same as the type of this Field
`void`	`checkType(DataType dataType)` Deprecated. Use `Schema.Field.checkType(CompleteDataType)`
`boolean`	`equalsNoCapture(Schema.Field other)`
`CompleteDataType`	`getCompleteDataType()` Return the CompleteDataType of the Field
`DataType`	`getDataType()` Return the DataType of the Field
`String`	`getDescription()` Returns the description currently set for this field.
`CompleteDataType`	`getElementType()` Return the element type for this field.
`int`	`getIndex()` Return the index of this field within the Schema
`com.streambase.sb.util.Location`	`getLocation()`
`String`	`getName()` Return the name of the Field.
`Schema.Field`	`getNestedField(String fieldPathName)` Return a field that identifies a field in a nested tuple field.
`Schema.Field[]`	`getNestedFields()` Return an array of fields, each of which identifies a field in a nested tuple field.
`Schema`	`getSchema()` Return the schema for this field.
`String`	`getShortName()` Return the last (which might be the only) segment of this Field
`int`	`getSize()` Return the size of the field (in bytes) without any header information.
`void`	`setDescription(String description)` Sets this field's description.
`String`	`toString()` Return a String representation of this field.

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

- Constructor Detail
  - Field
```
public Field(String name,
             CompleteDataType completeType,
             com.streambase.sb.util.Location loc)
```
  - Field
```
public Field(Schema.Field field)
```
    Construct a Field from an existing Field.
    
    Parameters:
    
    field - Field to copy data from
  - Field
```
public Field(String name,
             Schema.Field field)
```
    Construct a Field from an existing Field, giving the new field a specified name
    
    Parameters:
    
    name - The name of the field
    
    field - Field to copy data from
  - Field
```
@Deprecated
public Field(String name,
                          DataType dataType)
```
    Deprecated. Use Schema.createField(DataType, String) instead
    
    Construct a Field of a specified type, giving the new field a specified name.
    
    Parameters:
    
    name - The name of the Field
    
    dataType - The DataType of the Field
    
    Throws:
    
    IllegalArgumentException - if dataType requires a schema or an element type
  - Field
```
public Field(String name,
             DataType dataType,
             Schema s)
```
    Deprecated. Use Schema.Field#Field(String, CompleteDataType) instead with new Schema(name, CompleteDataType.forTuple(s)), or Schema.createTupleField(String, Schema)
    
    Construct a Field of a specified type and bound to a specified schema, giving the new field a specified name.
    
    Parameters:
    
    name - The name of the Field
    
    dataType - The DataType of the Field
    
    s - The schema of the Field
    
    Throws:
    
    IllegalArgumentException - if dataType doesn't require a schema or requires an element type
- Method Detail
  - getLocation
```
public com.streambase.sb.util.Location getLocation()
```
  - equalsNoCapture
```
public boolean equalsNoCapture(Schema.Field other)
```
  - checkType
```
public void checkType(DataType dataType)
               throws TupleException
```
    Deprecated. Use Schema.Field.checkType(CompleteDataType)
    
    Check to make sure that the given type is the same as the type of this Field
    
    Parameters:
    
    dataType - The DataType to check
    
    Throws:
    
    TupleException - thrown when the types do not match
  - checkType
```
public void checkType(CompleteDataType dataType)
               throws TupleException
```
    Check to make sure that the given type is the same as the type of this Field
    
    Parameters:
    
    dataType - The CompleteDataType to check
    
    Throws:
    
    TupleException - thrown when the types do not match
    
    Since:
    
    6.3.7
  - getDataType
```
public DataType getDataType()
```
    Return the DataType of the Field
    
    Returns:
    
    DataType of the Field
  - getCompleteDataType
```
public CompleteDataType getCompleteDataType()
```
    Return the CompleteDataType of the Field
    
    Returns:
    
    CompleteDataType of the Field
    
    Since:
    
    6.3
  - getName
```
public String getName()
```
    Return the name of the Field. If the Field was constructed from a field path name, that path name is returned
    
    Returns:
    
    The name of the Field
  - getShortName
```
public String getShortName()
```
    Return the last (which might be the only) segment of this Field
    
    Returns:
    
    the last segment of this Field
  - getIndex
```
public int getIndex()
```
    Return the index of this field within the Schema
    
    Returns:
    
    The index of the field within the Schema
  - getSize
```
public int getSize()
```
    Return the size of the field (in bytes) without any header information.
    
    Returns:
    
    The size of the Field in bytes (without header information)
  - getSchema
```
public Schema getSchema()
```
    Return the schema for this field. Valid only if the type of the field is Tuple.
    
    Returns:
    
    The schema, or null if field type is not Tuple
    
    Since:
    
    6.0
  - getNestedField
```
public Schema.Field getNestedField(String fieldPathName)
                            throws TupleException
```
    Return a field that identifies a field in a nested tuple field. This method can be applied only to a field whose type is Tuple.
    
    Parameters:
    
    fieldPathName - the path name to the desired nested tuple field
    
    Returns:
    
    the field
    
    Throws:
    
    TupleException - if the field path name is invalid or this field isn't of type Tuple
    
    Since:
    
    6.0
  - getNestedFields
```
public Schema.Field[] getNestedFields()
                               throws TupleException
```
    Return an array of fields, each of which identifies a field in a nested tuple field. This method can be applied only to a field whose type is Tuple.
    
    Returns:
    
    the array of fields
    
    Throws:
    
    TupleException - if this field is not of type Tuple.
    
    Since:
    
    6.0
  - toString
```
public String toString()
```
    Return a String representation of this field.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    String representation of this Field
  - getDescription
```
public String getDescription()
```
    Returns the description currently set for this field. At runtime this method will return null, and the description can only be guaranteed to have meaning during application development in the authoring environment.
    
    Returns:
    
    this field's description String null when unknown
  - setDescription
```
public void setDescription(String description)
```
    Sets this field's description.
    
    Parameters:
    
    description - the description String for this field
  - getElementType
```
public CompleteDataType getElementType()
```
    Return the element type for this field. Valid only if the type of the field is List.
    
    Returns:
    
    The schema, or null if field type is not List
    
    Since:
    
    6.3

Class Schema.Field

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Field

Field

Field

Field

Field

Method Detail

getLocation

equalsNoCapture

checkType

checkType

getDataType

getCompleteDataType

getName

getShortName

getIndex

getSize

getSchema

getNestedField

getNestedFields

toString

getDescription

setDescription

getElementType