org.apache.uima.cas

## Interface FeaturePath

-     public interface FeaturePath

  Interface for a feature path. A feature path is a sequence of features. The feature path can either be initialized using the addFeature() or the initialize() method. To initialize and check the feature path for a desired type call typeInit(). After these calls the feature path value can be extracted using the provided getter methods.
  The feature path elements are separated by "/". So a valid feature path is /my/feature/path.
  The feature path syntax also allows some built-in functions on the last feature path element. Built-in functions are added with a ":" followed by the function name. E.g. "/my/path:fsId()". The allowed built-in functions are:
  - coveredText()
  - fsId()
  - typeName()
  Built-in functions are only evaluated if getValueAsString() is called.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addFeature(Feature feat)` Add a new feature at the end of the path.
    `Boolean` | `getBooleanValue(FeatureStructure fs)` Returns the Boolean value of a boolean valued feature path.
    `Byte` | `getByteValue(FeatureStructure fs)` Returns the Byte value of a byte valued feature path.
    `Double` | `getDoubleValue(FeatureStructure fs)` Returns the Double value of a double valued feature path.
    `Feature` | `getFeature(int i)` Get feature at position.
    `String` | `getFeaturePath()` Returns the feature path as string.
    `Float` | `getFloatValue(FeatureStructure fs)` Returns the Float value of a float valued feature path.
    `FeatureStructure` | `getFSValue(FeatureStructure fs)` Returns the FeatureStructure of a FeatureStructure valued feature path.
    `Integer` | `getIntValue(FeatureStructure fs)` Returns the Integer value of an integer valued feature path.
    `Long` | `getLongValue(FeatureStructure fs)` Returns the Long value of a long valued feature path.
    `Short` | `getShortValue(FeatureStructure fs)` Returns the Short value of a short valued feature path.
    `String` | `getStringValue(FeatureStructure fs)` Returns the String value of a string valued feature path.
    `TypeClass` | `getTypClass(FeatureStructure fs)` Returns the type class of the feature path.
    `Type` | `getType(FeatureStructure fs)` Returns the type of the feature path.
    `String` | `getValueAsString(FeatureStructure fs)` Returns the feature path value as string for the given FeatureStructure.
    `void` | `initialize(String featurePath)` Initialize the feature path object with the given feature path string.
    `String` | `ll_getValueAsString(int fsRef, org.apache.uima.cas.impl.LowLevelCAS llCas)` Returns the feature path value as string for the given FeatureStructure.
    `int` | `size()` Get length of path.
    `void` | `typeInit(Type featurePathType)` Check the feature path for the given type and initialize internal structures for faster access to the feature path value.

- - ### Method Detail

    - #### size

          int size()

      Get length of path.
      Returns:
        An integer `>= 0`.

    - #### getFeature

          Feature getFeature(int i)

      Get feature at position.
      Parameters:
        `i` - The position in the path (starting at `0`).
      Returns:
        The feature, or `null` if there is no such feature.

    - #### addFeature

          void addFeature(Feature feat)

      Add a new feature at the end of the path.
      Parameters:
        `feat` - The feature to be added.

    - #### initialize

          void initialize(String featurePath)
                   throws CASException

      Initialize the feature path object with the given feature path string.
      Parameters:
        `featurePath` - The featurePath that is used for this feature path object.
      Throws:
        `CASException` - Throws an exception if the feature path syntax is invalid.

    - #### typeInit

          void typeInit(Type featurePathType)
                 throws CASException

      Check the feature path for the given type and initialize internal structures for faster access to the feature path value.
      Parameters:
        `featurePathType` - The type the feature path should be used on.
      Throws:
        `CASException` - Throws an exception if the feature path is not valid for the given type

    - #### getValueAsString

          String getValueAsString(FeatureStructure fs)

      Returns the feature path value as string for the given FeatureStructure. If the feature path contains a built-in function it is evaluated and the built-in function value is returned. If the feature path ends with an array the array is converted to a comma separated string.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the value of the feature path as String or null if the feature path was not set

    - #### ll_getValueAsString

          String ll_getValueAsString(int fsRef,
                                     org.apache.uima.cas.impl.LowLevelCAS llCas)

      Returns the feature path value as string for the given FeatureStructure. If the feature path contains a built-in function it is evaluated and the built-in function value is returned. If the feature path ends with an array the array is converted to a comma separated string.
      Parameters:
        `fsRef` - FeatureStructure reference (LowLevel API) to evaluate the feature path value
        `llCas` - LowLevelCAS for the fsRef
      Returns:
        Returns the value of the feature path as String

    - #### getType

          Type getType(FeatureStructure fs)

      Returns the type of the feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path type
      Returns:
        Returns the type of the feature path or null if the feature path is not set.

    - #### getTypClass

          TypeClass getTypClass(FeatureStructure fs)

      Returns the type class of the feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path type class
      Returns:
        Returns the type class of the feature path or null if the feature path is not set

    - #### getFeaturePath

          String getFeaturePath()

      Returns the feature path as string.
      Returns:
        Returns the feature path as string.

    - #### getStringValue

          String getStringValue(FeatureStructure fs)

      Returns the String value of a string valued feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the String value of a string valued feature path or null if the feature path was not set

    - #### getIntValue

          Integer getIntValue(FeatureStructure fs)

      Returns the Integer value of an integer valued feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the Integer value of a integer valued feature path or null if the feature path was not set

    - #### getBooleanValue

          Boolean getBooleanValue(FeatureStructure fs)

      Returns the Boolean value of a boolean valued feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the Boolean value of a boolean valued feature path or null if the feature path was not set

    - #### getByteValue

          Byte getByteValue(FeatureStructure fs)

      Returns the Byte value of a byte valued feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the Byte value of a byte valued feature path or null if the feature path was not set

    - #### getDoubleValue

          Double getDoubleValue(FeatureStructure fs)

      Returns the Double value of a double valued feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the Double value of a double valued feature path or null if the feature path was not set

    - #### getFloatValue

          Float getFloatValue(FeatureStructure fs)

      Returns the Float value of a float valued feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the Float value of a float valued feature path or null if the feature path was not set

    - #### getLongValue

          Long getLongValue(FeatureStructure fs)

      Returns the Long value of a long valued feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the Long value of a long valued feature path or null if the feature path was not set

    - #### getShortValue

          Short getShortValue(FeatureStructure fs)

      Returns the Short value of a short valued feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the Short value of a short valued feature path or null if the feature path was not set

    - #### getFSValue

          FeatureStructure getFSValue(FeatureStructure fs)

      Returns the FeatureStructure of a FeatureStructure valued feature path.
      Parameters:
        `fs` - FeatureStructure to evaluate the feature path value
      Returns:
        Returns the FeatureStructure value of a FeatureStructure valued feature path or null if the feature path was not set

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