org.codehaus.plexus.context

Interface Context

All Known Implementing Classes:

DefaultContext

public interface Context

Context is a Map of arbitrary data associated with the container.

Method Summary

Modifier and Type	Method and Description
boolean	contains(Object key) Returns true if this context contains a value for the specified key.
Object	get(Object key) Returns the value of the key.
Map<Object,Object>	getContextData() Utility method to retrieve containerContext data.
void	hide(Object key) Hides the item in the containerContext.
void	makeReadOnly() Make the containerContext read-only.
void	put(Object key, Object value) Adds the item to the containerContext.

Method Detail

contains

boolean contains(Object key)

Returns true if this context contains a value for the specified key.

Parameters:

key - the key to search

Returns:

true if the key was found; false otherwise

get

Object get(Object key)
    throws ContextException

Returns the value of the key. If the key can't be found it will throw a exception.

Parameters:

key - the key of the value to look up.

Returns:

returns the value associated with the key

Throws:

ContextException - if the key doesn't exist

getContextData

Map<Object,Object> getContextData()

Utility method to retrieve containerContext data. The returned Map is an unmodifiable view.

Returns:

the containerContext data

Since:

1.0-alpha-18

put

void put(Object key,
         Object value)
  throws IllegalStateException

Adds the item to the containerContext.

Parameters:

key - the key of the item

value - the item

Throws:

IllegalStateException - if this context is read-only

hide

void hide(Object key)
   throws IllegalStateException

Hides the item in the containerContext. After remove(key) has been called, a get(key) will always fail, even if the parent containerContext has such a mapping.

Parameters:

key - the items key

Throws:

IllegalStateException - if this context is read-only

makeReadOnly

void makeReadOnly()

Make the containerContext read-only. Any attempt to write to the containerContext via put() will result in an IllegalStateException.