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## org.apache.xerces.xni.parser
Interface XMLComponent

public interface XMLComponent

The component interface defines methods that must be implemented by components in a parser configuration. The component methods allow the component manager to initialize the component state and notify the component when feature and property values change.

Version:
  $Id: XMLComponent.java,v 1.5 2002/09/24 09:39:45 andyc Exp $
Author:
  Andy Clark, IBM
See Also:
  `XMLComponentManager`

Method Summary
`java.lang.Boolean` | `getFeatureDefault(java.lang.String featureId)` Returns the default state for a feature, or null if this component does not want to report a default value for this feature.
`java.lang.Object` | `getPropertyDefault(java.lang.String propertyId)` Returns the default state for a property, or null if this component does not want to report a default value for this property.
`java.lang.String[]` | `getRecognizedFeatures()` Returns a list of feature identifiers that are recognized by this component.
`java.lang.String[]` | `getRecognizedProperties()` Returns a list of property identifiers that are recognized by this component.
`void` | `reset(XMLComponentManager componentManager)` Resets the component.
`void` | `setFeature(java.lang.String featureId, boolean state)` Sets the state of a feature.
`void` | `setProperty(java.lang.String propertyId, java.lang.Object value)` Sets the value of a property.

Method Detail

### reset

    public void reset(XMLComponentManager componentManager)
               throws XMLConfigurationException

  Resets the component. The component can query the component manager about any features and properties that affect the operation of the component.
  Parameters:
    `componentManager` - The component manager.
  Throws:
    `XNIException` - Thrown by component on initialization error.

### getRecognizedFeatures

    public java.lang.String[] getRecognizedFeatures()

  Returns a list of feature identifiers that are recognized by this component. This method may return null if no features are recognized by this component.

### setFeature

    public void setFeature(java.lang.String featureId,
                           boolean state)
                    throws XMLConfigurationException

  Sets the state of a feature. This method is called by the component manager any time after reset when a feature changes state.

  Note: Components should silently ignore features that do not affect the operation of the component.

  Parameters:
    `featureId` - The feature identifier.
    `state` - The state of the feature.
  Throws:
    `XMLConfigurationException` - Thrown for configuration error. In general, components should only throw this exception if it is really a critical error.

### getRecognizedProperties

    public java.lang.String[] getRecognizedProperties()

  Returns a list of property identifiers that are recognized by this component. This method may return null if no properties are recognized by this component.

### setProperty

    public void setProperty(java.lang.String propertyId,
                            java.lang.Object value)
                     throws XMLConfigurationException

  Sets the value of a property. This method is called by the component manager any time after reset when a property changes value.

  Note: Components should silently ignore properties that do not affect the operation of the component.

  Parameters:
    `propertyId` - The property identifier.
    `value` - The value of the property.
  Throws:
    `XMLConfigurationException` - Thrown for configuration error. In general, components should only throw this exception if it is really a critical error.

### getFeatureDefault

    public java.lang.Boolean getFeatureDefault(java.lang.String featureId)

  Returns the default state for a feature, or null if this component does not want to report a default value for this feature.
  Parameters:
    `featureId` - The feature identifier.
  Since:
    Xerces 2.2.0

### getPropertyDefault

    public java.lang.Object getPropertyDefault(java.lang.String propertyId)

  Returns the default state for a property, or null if this component does not want to report a default value for this property.
  Parameters:
    `propertyId` - The property identifier.
  Since:
    Xerces 2.2.0

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