org.springframework.ui

## Interface Model

- All Known Subinterfaces:
    RedirectAttributes
  All Known Implementing Classes:
    BindingAwareModelMap, ExtendedModelMap, RedirectAttributesModelMap

      public interface Model

  Java-5-specific interface that defines a holder for model attributes. Primarily designed for adding attributes to the model. Allows for accessing the overall model as a `java.util.Map`.
  Since:
    2.5.1
  Author:
    Juergen Hoeller

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Model` | `addAllAttributes(Collection<?> attributeValues)` Copy all attributes in the supplied `Collection` into this `Map`, using attribute name generation for each element.
    `Model` | `addAllAttributes(Map<String,?> attributes)` Copy all attributes in the supplied `Map` into this `Map`.
    `Model` | `addAttribute(Object attributeValue)` Add the supplied attribute to this `Map` using a `generated name`.
    `Model` | `addAttribute(String attributeName, Object attributeValue)` Add the supplied attribute under the supplied name.
    `Map<String,Object>` | `asMap()` Return the current set of model attributes as a Map.
    `boolean` | `containsAttribute(String attributeName)` Does this model contain an attribute of the given name?
    `Model` | `mergeAttributes(Map<String,?> attributes)` Copy all attributes in the supplied `Map` into this `Map`, with existing objects of the same name taking precedence (i.e.

- - ### Method Detail

    - #### addAttribute

          Model addAttribute(String attributeName,
                           Object attributeValue)

      Add the supplied attribute under the supplied name.
      Parameters:
        `attributeName` - the name of the model attribute (never `null`)
        `attributeValue` - the model attribute value (can be `null`)

    - #### addAttribute

          Model addAttribute(Object attributeValue)

      Add the supplied attribute to this `Map` using a `generated name`.

      Note: Empty `Collections` are not added to the model when using this method because we cannot correctly determine the true convention name. View code should check for `null` rather than for empty collections as is already done by JSTL tags.

      Parameters:
        `attributeValue` - the model attribute value (never `null`)

    - #### addAllAttributes

          Model addAllAttributes(Collection<?> attributeValues)

      Copy all attributes in the supplied `Collection` into this `Map`, using attribute name generation for each element.
      See Also:
        `addAttribute(Object)`

    - #### addAllAttributes

          Model addAllAttributes(Map<String,?> attributes)

      Copy all attributes in the supplied `Map` into this `Map`.
      See Also:
        `addAttribute(String, Object)`

    - #### mergeAttributes

          Model mergeAttributes(Map<String,?> attributes)

      Copy all attributes in the supplied `Map` into this `Map`, with existing objects of the same name taking precedence (i.e. not getting replaced).

    - #### containsAttribute

          boolean containsAttribute(String attributeName)

      Does this model contain an attribute of the given name?
      Parameters:
        `attributeName` - the name of the model attribute (never `null`)
      Returns:
        whether this model contains a corresponding attribute

    - #### asMap

          Map<String,Object> asMap()

      Return the current set of model attributes as a Map.