## Uses of Interface
org.apache.tiles.request.attribute.HasKeys

- Packages that use HasKeys
  Package | Description
  --- | ---
  org.apache.tiles.request.attribute | Methods to get, set and remove attributes from different sources (like HTTP requests or sessions).
  org.apache.tiles.request.collection | Special collections and maps for attributes (like HTTP request or session attributes).
  org.apache.tiles.request.freemarker.extractor | Extractors to get information from Freemarker objects.
  org.apache.tiles.request.jsp.extractor | Extractors to get scopes from `PageContext`.
  org.apache.tiles.request.servlet.extractor | Extractors to get attributes and other info from servlet requests and contexts.
  org.apache.tiles.request.velocity.extractor | Extractors to get info about Velocity-specific objects.

- - ### Uses of HasKeys in org.apache.tiles.request.attribute

    Subinterfaces of HasKeys in org.apache.tiles.request.attribute
    Modifier and Type | Interface and Description
    --- | ---
    `interface` | `AttributeExtractor` Allows to get, put and remove Object-type attributes.
    `interface` | `EnumeratedValuesExtractor` Allows to get values from multi-valued attributes.
    `interface` | `HasAddableKeys<V>` Allows to get and set attributes.
    `interface` | `HasRemovableKeys<V>` Allows to get and remove attributes.

  - ### Uses of HasKeys in org.apache.tiles.request.collection

    Fields in org.apache.tiles.request.collection declared as HasKeys
    Modifier and Type | Field and Description
    --- | ---
    `protected HasKeys<V>` | ReadOnlyEnumerationMap.`request` The request.

    Constructors in org.apache.tiles.request.collection with parameters of type HasKeys
    Constructor and Description
    `KeySet(HasKeys<?> request)` Constructor.
    `ReadOnlyEnumerationMap(HasKeys<V> request)` Constructor.

  - ### Uses of HasKeys in org.apache.tiles.request.freemarker.extractor

    Classes in org.apache.tiles.request.freemarker.extractor that implement HasKeys
    Modifier and Type | Class and Description
    --- | ---
    `class` | `EnvironmentScopeExtractor` Extract attributes from `Environment` objects as a scope.

  - ### Uses of HasKeys in org.apache.tiles.request.jsp.extractor

    Classes in org.apache.tiles.request.jsp.extractor that implement HasKeys
    Modifier and Type | Class and Description
    --- | ---
    `class` | `ScopeExtractor` Extracts attributes from a numbered scope from `JspContext`.

  - ### Uses of HasKeys in org.apache.tiles.request.servlet.extractor

    Classes in org.apache.tiles.request.servlet.extractor that implement HasKeys
    Modifier and Type | Class and Description
    --- | ---
    `class` | `ApplicationScopeExtractor` Extract attributes from application scope.
    `class` | `HeaderExtractor` Extract header values from an HTTP request.
    `class` | `InitParameterExtractor` Extract initialization parameters from the servlet context.
    `class` | `ParameterExtractor` Extract parameters from the request.
    `class` | `RequestScopeExtractor` Extracts attributes from request scope.
    `class` | `SessionScopeExtractor` Extract attributes from session scope.

  - ### Uses of HasKeys in org.apache.tiles.request.velocity.extractor

    Classes in org.apache.tiles.request.velocity.extractor that implement HasKeys
    Modifier and Type | Class and Description
    --- | ---
    `class` | `VelocityScopeExtractor` Extracts attributes from Velocity context..

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