org.apache.uima.cas

## Interface FeatureStructure

- All Known Subinterfaces:
    AnnotationBaseFS, AnnotationFS, ArrayFS, BooleanArrayFS, ByteArrayFS, CommonArrayFS, DoubleArrayFS, FloatArrayFS, IntArrayFS, LongArrayFS, ShortArrayFS, SofaFS, StringArrayFS
  All Known Implementing Classes:
    Annotation, AnnotationBase, BooleanArray, ByteArray, DocumentAnnotation, DoubleArray, EmptyFloatList, EmptyFSList, EmptyIntegerList, EmptyStringList, org.apache.uima.cas.impl.FeatureStructureImpl, FloatArray, FloatList, FSArray, FSList, IntegerArray, IntegerList, LongArray, NonEmptyFloatList, NonEmptyFSList, NonEmptyIntegerList, NonEmptyStringList, ShortArray, Sofa, SourceDocumentInformation, StringArray, StringList, TOP

      public interface FeatureStructure

  Interface for feature structures.

  Note that object identity is not meaningful for feature structures. You may ask the CAS for the same feature structure two times in a row, and get different object references. Use `equals()` instead.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `clone()` Creates a copy of this feature structure.
    `boolean` | `equals(Object o)` A feature structure is equal to another feature structure iff it is identical in the underlying representation.
    `boolean` | `getBooleanValue(Feature feat)` Get the boolean value of a feature.
    `byte` | `getByteValue(Feature feat)` Get the byte value of a feature.
    `CAS` | `getCAS()` Return the CAS that this FS belongs to.
    `double` | `getDoubleValue(Feature feat)` Get the double value of a feature.
    `FeatureStructure` | `getFeatureValue(Feature feat)` Get a feature value.
    `String` | `getFeatureValueAsString(Feature feat)` Get the value of the feature as a string if the type of the feature is one of the primitive type.
    `float` | `getFloatValue(Feature feat)` Get the float value of a feature.
    `int` | `getIntValue(Feature feat)` Get the int value of a feature.
    `long` | `getLongValue(Feature feat)` Get the long value of a feature.
    `short` | `getShortValue(Feature feat)` Get the short value of a feature.
    `String` | `getStringValue(Feature f)` Get the string value under a feature.
    `Type` | `getType()` Get the type of this FS.
    `int` | `hashCode()` Will return a hash code that's consistent with equality, i.e., if two FSs are equal, they will also return the same hash code.
    `void` | `setBooleanValue(Feature feat, boolean i)` Set the boolean value of a feature.
    `void` | `setByteValue(Feature feat, byte i)` Set the byte (8 bit) value of a feature.
    `void` | `setDoubleValue(Feature feat, double i)` Set the double value of a feature.
    `void` | `setFeatureValue(Feature feat, FeatureStructure fs)` Set a feature value to another FS.
    `void` | `setFeatureValueFromString(Feature feat, String s)` Sets the value of a feature from a string input if the feature type is one of the primitive types.
    `void` | `setFloatValue(Feature feat, float f)` Set the float value of a feature.
    `void` | `setIntValue(Feature feat, int i)` Set the int value of a feature.
    `void` | `setLongValue(Feature feat, long i)` Set the long (64 bit) value of a feature.
    `void` | `setShortValue(Feature feat, short i)` Set the short (16 bit) value of a feature.
    `void` | `setStringValue(Feature feat, String s)` Set the string value of a feature.

- - ### Method Detail

    - #### getType

          Type getType()

      Get the type of this FS.
      Returns:
        The type.

    - #### setFeatureValue

          void setFeatureValue(Feature feat,
                               FeatureStructure fs)
                        throws CASRuntimeException

      Set a feature value to another FS.
      Parameters:
        `feat` - The feature whose value should be set.
        `fs` - The value FS.
      Throws:
        `CASRuntimeException` - If there is a typing violation, i.e., if `feat` is not defined for the type of this FS, or the range type of `feat` is not a supertype of `fs.getType()`.

    - #### getFeatureValue

          FeatureStructure getFeatureValue(Feature feat)
                                    throws CASRuntimeException

      Get a feature value.
      Parameters:
        `feat` - The feature whose value we want to get.
      Returns:
        The value; may be `null` if the value has not been set.
      Throws:
        `CASRuntimeException` - If there is a typing violation, i.e., if `feat` is not defined for the type of this FS, or the range type of `feat` is Float, Integer or String.

    - #### setStringValue

          void setStringValue(Feature feat,
                              String s)
                       throws CASRuntimeException

      Set the string value of a feature.
      Parameters:
        `feat` - The feature whose value we want to set.
        `s` - The string we're setting the feature to.
      Throws:
        `CASRuntimeException` - If there is a typing violation, i.e., if `feat` is not defined for `this.getType()` or `feat.getRange()` is not `CAS.STRING_TYPE`.

    - #### getStringValue

          String getStringValue(Feature f)
                         throws CASRuntimeException

      Get the string value under a feature.
      Parameters:
        `f` - The feature for which we want the value.
      Returns:
        The value of this feature; may be `null` if the value has not been set.
      Throws:
        `CASRuntimeException` - If there is a typing violation, i.e., if `f` is not defined for the type of this feature structure, or if the range type of `f` is not String.

    - #### getFloatValue

          float getFloatValue(Feature feat)
                       throws CASRuntimeException

      Get the float value of a feature. This method will throw an exception if the feature is not float valued.
      Parameters:
        `feat` - The feature whose value we want to get.
      Returns:
        The value float; `0.0` if the value has not been set.
      Throws:
        `CASRuntimeException` - If `feat` is not defined for the type of this FS, or if it is not float valued.

    - #### setFloatValue

          void setFloatValue(Feature feat,
                             float f)
                      throws CASRuntimeException

      Set the float value of a feature.
      Parameters:
        `feat` - The feature whose value we want to set.
        `f` - The float we're setting the feature to.
      Throws:
        `CASRuntimeException` - If `feat` is not defined for the type of this FS, or if it is not float valued.

    - #### getIntValue

          int getIntValue(Feature feat)
                   throws CASRuntimeException

      Get the int value of a feature. This method will throw an exception if the feature is not int valued.
      Parameters:
        `feat` - The feature whose value we want to get.
      Returns:
        The value int; `0` if the value has not been set.
      Throws:
        `CASRuntimeException` - If `feat` is not defined for the type of this FS, or if it is not int valued.

    - #### setIntValue

          void setIntValue(Feature feat,
                           int i)
                    throws CASRuntimeException

      Set the int value of a feature.
      Parameters:
        `feat` - The feature whose value we want to set.
        `i` - The int we're setting the feature to.
      Throws:
        `CASRuntimeException`

    - #### getByteValue

          byte getByteValue(Feature feat)
                     throws CASRuntimeException

      Get the byte value of a feature. This method will throw an exception if the feature is not byte valued.
      Parameters:
        `feat` - The feature whose value we want to set.
      Returns:
        The value byte; `0` if the value has not been set.
      Throws:
        `CASRuntimeException` - tbd

    - #### setByteValue

          void setByteValue(Feature feat,
                            byte i)
                     throws CASRuntimeException

      Set the byte (8 bit) value of a feature.
      Parameters:
        `feat` - The feature whose value we want to set.
        `i` - The 8bit value we're setting the feature to.
      Throws:
        `CASRuntimeException` - tbd

    - #### getBooleanValue

          boolean getBooleanValue(Feature feat)
                           throws CASRuntimeException

      Get the boolean value of a feature. This method will throw an exception if the feature is not boolean valued.
      Parameters:
        `feat` - The feature whose value we want to get.
      Returns:
        The value int; `0` if the value has not been set.
      Throws:
        `CASRuntimeException` - If `feat` is not defined for the type of this FS, or if it is not boolean valued.

    - #### setBooleanValue

          void setBooleanValue(Feature feat,
                               boolean i)
                        throws CASRuntimeException

      Set the boolean value of a feature.
      Parameters:
        `feat` - The feature whose value we want to set.
        `i` - The boolean value we're setting the feature to.
      Throws:
        `CASRuntimeException`

    - #### getShortValue

          short getShortValue(Feature feat)
                       throws CASRuntimeException

      Get the short value of a feature. This method will throw an exception if the feature is not short valued.
      Parameters:
        `feat` - The feature whose value we want to get.
      Returns:
        The value int; `0` if the value has not been set.
      Throws:
        `CASRuntimeException` - If `feat` is not defined for the type of this FS, or if it is not short valued.

    - #### setShortValue

          void setShortValue(Feature feat,
                             short i)
                      throws CASRuntimeException

      Set the short (16 bit) value of a feature.
      Parameters:
        `feat` - The feature whose value we want to set.
        `i` - The short (16bit) value we're setting the feature to.
      Throws:
        `CASRuntimeException`

    - #### getLongValue

          long getLongValue(Feature feat)
                     throws CASRuntimeException

      Get the long value of a feature. This method will throw an exception if the feature is not long valued.
      Parameters:
        `feat` - The feature whose value we want to get.
      Returns:
        The value int; `0` if the value has not been set.
      Throws:
        `CASRuntimeException` - If `feat` is not defined for the type of this FS, or if it is not long valued.

    - #### setLongValue

          void setLongValue(Feature feat,
                            long i)
                     throws CASRuntimeException

      Set the long (64 bit) value of a feature.
      Parameters:
        `feat` - The feature whose value we want to set.
        `i` - The long (64bit) value we're setting the feature to.
      Throws:
        `CASRuntimeException`

    - #### getDoubleValue

          double getDoubleValue(Feature feat)
                         throws CASRuntimeException

      Get the double value of a feature. This method will throw an exception if the feature is not double valued.
      Parameters:
        `feat` - The feature whose value we want to get.
      Returns:
        The value int; `0` if the value has not been set.
      Throws:
        `CASRuntimeException` - If `feat` is not defined for the type of this FS, or if it is not double valued.

    - #### setDoubleValue

          void setDoubleValue(Feature feat,
                              double i)
                       throws CASRuntimeException

      Set the double value of a feature.
      Parameters:
        `feat` - The feature whose value we want to set.
        `i` - The double value we're setting the feature to.
      Throws:
        `CASRuntimeException`

    - #### getFeatureValueAsString

          String getFeatureValueAsString(Feature feat)
                                  throws CASRuntimeException

      Get the value of the feature as a string if the type of the feature is one of the primitive type.
      Parameters:
        `feat` - The feature whose value we want to get and whose type is one of the primitve types.
      Returns:
        A string representation of the feature value.
      Throws:
        `CASRuntimeException` - If `feat` is not defined for the type of this FS, or if the type is not a primitive type.

    - #### setFeatureValueFromString

          void setFeatureValueFromString(Feature feat,
                                         String s)
                                  throws CASRuntimeException

      Sets the value of a feature from a string input if the feature type is one of the primitive types.
      Parameters:
        `feat` - The feature whose value we want to set.
        `s` - The string value that the feature will be set to.
      Throws:
        `CASRuntimeException` - If `feat` is not a primitive type or the value cannot be converted to this type.

    - #### equals

          boolean equals(Object o)
                  throws ClassCastException

      A feature structure is equal to another feature structure iff it is identical in the underlying representation.
      Overrides:
        `equals` in class `Object`
      Throws:
        `ClassCastException` - If `o` is not a FS.

    - #### clone

          Object clone()
                throws CASRuntimeException

      Creates a copy of this feature structure. The returned feature structure is a new and separate object but all features of the feature structure which are not of builtin types (integer, float, string) will be shared between the clone and it's source FS.
      Returns:
        a FeatureStructure that is the cloned copy of this FeatureStructure.
      Throws:
        `CASRuntimeException` - passthru

    - #### hashCode

          int hashCode()

      Will return a hash code that's consistent with equality, i.e., if two FSs are equal, they will also return the same hash code.
      Overrides:
        `hashCode` in class `Object`
      Returns:
        The hash code.

    - #### getCAS

          CAS getCAS()

      Return the CAS that this FS belongs to.
      Returns:
        The CAS.

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