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## org.springframework.ui
Interface Model

All Known Implementing Classes:
  ExtendedModelMap

    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
`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. not getting replaced).

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.

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