org.apache.uima.resource.metadata

## Interface Precondition

- All Superinterfaces:
    Cloneable, MetaDataObject, Serializable, XMLizable
  All Known Subinterfaces:
    LanguagePrecondition, MimeTypePrecondition, SimplePrecondition

      public interface Precondition
      extends MetaDataObject

  A `Precondition` of a Resource is a condition that an Entity and/or its analysis in the `CAS` must satisfy before that Entity can be processed by the Resource.

  Currently the framework does not fully support Preconditions. Only the `LanguagePrecondition` subinterface is used.

  As with all `MetaDataObject`s, a `Precondition` may or may not be modifiable. An application can find out by calling the `MetaDataObject.isModifiable()` method.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `evaluate(CAS aCAS)` Determines if this precondition is satisfied by a CAS.
    `String` | `getPreconditionType()` Gets the type of this precondition.

    - ### Methods inherited from interface org.apache.uima.resource.metadata.MetaDataObject

      `clone, equals, getAttributeValue, getSourceUrl, getSourceUrlString, isModifiable, listAttributes, setAttributeValue, setSourceUrl`

    - ### Methods inherited from interface org.apache.uima.util.XMLizable

      `buildFromXMLElement, buildFromXMLElement, toXML, toXML, toXML, toXML`

- - ### Method Detail

    - #### getPreconditionType

          String getPreconditionType()

      Gets the type of this precondition. Each sub-interface of `Precondition` has its own standard type identifier String. These identifier Strings are used instead of Java class names in order to ease portability of metadata to other languages.
      Returns:
        the type identifier String for this precondition

    - #### evaluate

          boolean evaluate(CAS aCAS)

      Determines if this precondition is satisfied by a CAS.
      Parameters:
        `aCAS` - the CAS against which to evaluate this precondition
      Returns:
        true if and only if the CAS satisfies this precondition.

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