org.apache.uima.resource.metadata

## Interface MetaDataObject

- All Superinterfaces:
    Cloneable, Serializable, XMLizable
  All Known Subinterfaces:
    AllowedValue, AnalysisEngineDescription, AnalysisEngineMetaData, Capability, CapabilityLanguageFlow, CasConsumerDescription, CasInitializerDescription, CasProcessorDeploymentParam, CasProcessorErrorHandling, CasProcessorErrorRateThreshold, CasProcessorExecArg, CasProcessorExecutable, CasProcessorFilter, CasProcessorMaxRestarts, CasProcessorRunInSeperateProcess, CasProcessorRuntimeEnvParam, CasProcessorTimeout, CollectionReaderDescription, ConfigurableDataResourceSpecifier, ConfigurationGroup, ConfigurationParameter, ConfigurationParameterDeclarations, ConfigurationParameterSettings, CpeCasProcessor, CpeCasProcessors, CpeCheckpoint, CpeCollectionReader, CpeCollectionReaderCasInitializer, CpeCollectionReaderIterator, CpeComponentDescriptor, CpeConfiguration, CpeDescription, CpeInclude, CpeIntegratedCasProcessor, CpeLocalCasProcessor, CpeRemoteCasProcessor, CpeResourceManagerConfiguration, CpeSofaMapping, CpeSofaMappings, CustomResourceSpecifier, ExternalResourceBinding, ExternalResourceDependency, ExternalResourceDescription, FeatureDescription, FileLanguageResourceSpecifier, FileResourceSpecifier, FixedFlow, FlowConstraints, FlowControllerDeclaration, FlowControllerDescription, FsIndexCollection, FsIndexDescription, FsIndexKeyDescription, Import, JMSMessagingSpecifier, LanguagePrecondition, MailMessagingSpecifier, MessagingSpecifier, MimeTypePrecondition, MQMessagingSpecifier, NameValuePair, OutputQueue, Parameter, PearSpecifier, Precondition, ProcessingResourceMetaData, ResourceCreationSpecifier, ResourceManagerConfiguration, ResourceMetaData, ResourceServiceSpecifier, ResourceSpecifier, ResourceSpecifierList, SimplePrecondition, SofaMapping, TaeDescription, TypeDescription, TypeOrFeature, TypePriorities, TypePriorityList, TypeSystemDescription, URISpecifier

      public interface MetaDataObject
      extends Cloneable, Serializable, XMLizable

  An object used to represent metadata of a `Resource`.

  A list of all attributes on a `MetaDataObject` can be obtained by calling its `listAttributes()` method. The values of attributes can be get and set by using the `getAttributeValue(String)` and `setAttributeValue(String,Object)` methods. The value of an attribute may be any Object, including another `MetaDataObject`.

  `MetaDataObject`s are not required to allow modification of their attributes' values. An application should check the `isModifiable()` method to determine if attribute values can be modified. Calling `setAttributeValue(String,Object)` on an unmodifiable object will result in a `UIMA_UnsupportedOperationException`.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `clone()` Creates a clone of this `MetaDataObject`.
    `boolean` | `equals(Object aObj)` Determines if this object is equal to another.
    `Object` | `getAttributeValue(String aName)` Retrieves the value of an attribute of this `MetaDataObject`.
    `URL` | `getSourceUrl()` Gets the URL from which this object was parsed.
    `String` | `getSourceUrlString()` If the sourceURL of this object is non-null, returns its string representation.
    `boolean` | `isModifiable()` Returns whether this `MetaDataObject` allows the values of its attributes to be modified.
    `List<NameClassPair>` | `listAttributes()` Deprecated. - use getAttributes() instead, don't override it, use getAdditionalAttributes to specify additional ones
    `void` | `setAttributeValue(String aName, Object aValue)` Sets the value of an attribute of this `MetaDataObject`.
    `void` | `setSourceUrl(URL aUrl)` Sets the URL from which this object was parsed.

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

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

- - ### Method Detail

    - #### listAttributes

          @Deprecated
          List<NameClassPair> listAttributes()

      Deprecated. - use getAttributes() instead, don't override it, use getAdditionalAttributes to specify additional ones
      Retrieves all attributes on this `MetaDataObject`.
      Returns:
        a List containing `NameClassPair` objects, each of which contains the name of a parameter and the Class of its value. For primitive types, the wrapper classes will be returned (e.g. `java.lang.Integer` instead of int).

    - #### getAttributeValue

          Object getAttributeValue(String aName)

      Retrieves the value of an attribute of this `MetaDataObject`.
      Parameters:
        `aName` - the name of the parameter to get
      Returns:
        the value of the parameter named `aName`. Returns `null` if there is no attribute with that name.

    - #### isModifiable

          boolean isModifiable()

      Returns whether this `MetaDataObject` allows the values of its attributes to be modified.
      Returns:
        true if and only if this object's attributes may be modified.

    - #### setAttributeValue

          void setAttributeValue(String aName,
                                 Object aValue)

      Sets the value of an attribute of this `MetaDataObject`. Applications should first check the `isModifiable()` method; calling `setAttributeValue(String, Object)` on an unmodifiable `MetaDataObject` will result in an exception.
      Parameters:
        `aName` - the name of the parameter to set
        `aValue` - the value to assign to the parameter
      Throws:
        `UIMA_UnsupportedOperationException` - if this `MetaDataObject` is not modifiable.
        `UIMA_IllegalArgumentException` - if the given value is not appropriate for the given attribute.

    - #### clone

          Object clone()

      Creates a clone of this `MetaDataObject`. This performs a "deep" copy by cloning all attribute values that are also MetaDataObjects.
      Returns:
        a clone of this `MetaDataObject`

    - #### equals

          boolean equals(Object aObj)

      Determines if this object is equal to another. Two MetaDataObjects are equal if they share the same attributes and the same values for those attributes.
      Overrides:
        `equals` in class `Object`
      Parameters:
        `aObj` - an object with which to compare this object
      Returns:
        true if and only if this object equals `aObj`

    - #### getSourceUrl

          URL getSourceUrl()

      Gets the URL from which this object was parsed. When this object is parsed from an XML file, this is set by the parser to the URL of the source file XML file. If the object has been created by some other method, the source URL will not be known, and this method will return null.

      This setting is used to resolve imports and is also included in exception messages to indicate the source of the problem.

      Returns:
        the source URL from which this object was parsed

    - #### getSourceUrlString

          String getSourceUrlString()

      If the sourceURL of this object is non-null, returns its string representation. If it is null, returns "<unknown>". Useful for error messages.
      Returns:
        the source URL as a string, or "<unknown>"

    - #### setSourceUrl

          void setSourceUrl(URL aUrl)

      Sets the URL from which this object was parsed. Typically only the XML parser sets this. This recursively sets the source URL of all descendants of this object.
      Parameters:
        `aUrl` - the location of the XML file from which this object was parsed

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