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## org.apache.commons.scxml.env
Class SimpleContext

    java.lang.Object
      org.apache.commons.scxml.env.SimpleContext

All Implemented Interfaces:
  Context

Direct Known Subclasses:
  ELContext, JexlContext, SessionContext

public class SimpleContext
extends Object
implements Context

Simple Context wrapping a map of variables.

Constructor Summary
`SimpleContext()` Constructor.
`SimpleContext(Context parent)` Constructor.
`SimpleContext(Context parent, Map initialVars)` Constructor.
`SimpleContext(Map initialVars)` Constructor.

Method Summary
`Object` | `get(String name)` Get the value of this variable; delegating to parent.
`protected org.apache.commons.logging.Log` | `getLog()` Get the log used by this `Context` instance.
`Context` | `getParent()` Get the parent Context, may be null.
`Map` | `getVars()` Get the Map of all local variables in this Context.
`boolean` | `has(String name)` Check if this variable exists, delegating to parent.
`void` | `reset()` Clear this Context.
`void` | `set(String name, Object value)` Assigns a new value to an existing variable or creates a new one.
`void` | `setLocal(String name, Object value)` Assigns a new value to an existing variable or creates a new one.
`protected void` | `setLog(org.apache.commons.logging.Log log)` Set the log used by this `Context` instance.
`protected void` | `setVars(Map vars)` Set the variables map.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SimpleContext

    public SimpleContext()

  Constructor.

### SimpleContext

    public SimpleContext(Context parent)

  Constructor.

Parameters:
  `parent` - A parent Context, can be null

### SimpleContext

    public SimpleContext(Map initialVars)

  Constructor.

Parameters:
  `initialVars` - A pre-populated initial variables map

### SimpleContext

    public SimpleContext(Context parent,
                         Map initialVars)

  Constructor.

Parameters:
  `parent` - A parent Context, can be null
  `initialVars` - A pre-populated initial variables map

Method Detail

### set

    public void set(String name,
                    Object value)

  Assigns a new value to an existing variable or creates a new one. The method searches the chain of parent Contexts for variable existence.

  Specified by:
    `set` in interface `Context`
  Parameters:
    `name` - The variable name
    `value` - The variable value
  See Also:
    `Context.set(String, Object)`

### get

    public Object get(String name)

  Get the value of this variable; delegating to parent.

  Specified by:
    `get` in interface `Context`
  Parameters:
    `name` - The variable name
  Returns:
    Object The variable value
  See Also:
    `Context.get(java.lang.String)`

### has

    public boolean has(String name)

  Check if this variable exists, delegating to parent.

  Specified by:
    `has` in interface `Context`
  Parameters:
    `name` - The variable name
  Returns:
    boolean true if this variable exists
  See Also:
    `Context.has(java.lang.String)`

### reset

    public void reset()

  Clear this Context.

  Specified by:
    `reset` in interface `Context`
  See Also:
    `Context.reset()`

### getParent

    public Context getParent()

  Get the parent Context, may be null.

  Specified by:
    `getParent` in interface `Context`
  Returns:
    Context The parent Context
  See Also:
    `Context.getParent()`

### setLocal

    public void setLocal(String name,
                         Object value)

  Assigns a new value to an existing variable or creates a new one. The method allows to shaddow a variable of the same name up the Context chain.

  Specified by:
    `setLocal` in interface `Context`
  Parameters:
    `name` - The variable name
    `value` - The variable value
  See Also:
    `Context.setLocal(String, Object)`

### setVars

    protected void setVars(Map vars)

  Set the variables map.

  Parameters:
    `vars` - The new Map of variables.

### getVars

    public Map getVars()

  Get the Map of all local variables in this Context.

  Specified by:
    `getVars` in interface `Context`
  Returns:
    Returns the vars.
  See Also:
    `Context.getParent()`

### setLog

    protected void setLog(org.apache.commons.logging.Log log)

  Set the log used by this `Context` instance.

  Parameters:
    `log` - The new log.

### getLog

    protected org.apache.commons.logging.Log getLog()

  Get the log used by this `Context` instance.

  Returns:
    Log The log being used.

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Copyright © 2005-2006 The Apache Software Foundation. All Rights Reserved.