org.apache.commons.jexl3

## Class MapContext

- java.lang.Object
- - org.apache.commons.jexl3.MapContext

- All Implemented Interfaces:
    JexlContext

      public class MapContext
      extends Object
      implements JexlContext

  Wraps a map in a context.

  Each entry in the map is considered a variable name, value pair.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface org.apache.commons.jexl3.JexlContext

      `JexlContext.AnnotationProcessor, JexlContext.CancellationHandle, JexlContext.NamespaceFunctor, JexlContext.NamespaceResolver, JexlContext.OptionsHandle, JexlContext.PragmaProcessor, JexlContext.ThreadLocal`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MapContext()` Creates a MapContext on an automatically allocated underlying HashMap.
    `MapContext(Map<String,Object> vars)` Creates a MapContext wrapping an existing user provided map.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `clear()` Clears all variables.
    `Object` | `get(String name)` Gets the value of a variable.
    `boolean` | `has(String name)` Checks whether a variable is defined in this context.
    `void` | `set(String name, Object value)` Sets the value of a variable.

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### MapContext

          public MapContext()

      Creates a MapContext on an automatically allocated underlying HashMap.

    - #### MapContext

          public MapContext(Map<String,Object> vars)

      Creates a MapContext wrapping an existing user provided map.
      Parameters:
        `vars` - the variable map

  - ### Method Detail

    - #### has

          public boolean has(String name)

      Description copied from interface: `JexlContext`
      Checks whether a variable is defined in this context.

      A variable may be defined with a null value; this method checks whether the value is null or if the variable is undefined.

      Specified by:
        `has` in interface `JexlContext`
      Parameters:
        `name` - the variable's name
      Returns:
        true if it exists, false otherwise

    - #### get

          public Object get(String name)

      Description copied from interface: `JexlContext`
      Gets the value of a variable.
      Specified by:
        `get` in interface `JexlContext`
      Parameters:
        `name` - the variable's name
      Returns:
        the value

    - #### set

          public void set(String name,
                          Object value)

      Description copied from interface: `JexlContext`
      Sets the value of a variable.
      Specified by:
        `set` in interface `JexlContext`
      Parameters:
        `name` - the variable's name
        `value` - the variable's value

    - #### clear

          public void clear()

      Clears all variables.

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