org.opensaml.messaging.context

Class BaseContext

java.lang.Object

org.opensaml.messaging.context.BaseContext

All Implemented Interfaces:

Iterable<BaseContext>

Direct Known Subclasses:

HttpClientRequestContext, InOutOperationContext, MessageChannelSecurityContext, MessageContext

public abstract class BaseContext
extends Object
implements Iterable<BaseContext>

Base implementation of a component which represents the context used to store state used for purposes related to messaging.

Specific implementations of contexts would normally add additional properties to the context to represent the state that is to be stored by that particular context implementation.

A context may also function as a container of subcontexts. Access to subcontexts is class-based. The parent context may hold only one instance of a given class at a given time. This class-based indexing approach is used to enforce type-safety over the subcontext instances returned from the parent context, and avoids the need for casting.

When a subcontext is requested and it does not exist in the parent context, it may optionally be auto-created. In order to be auto-created in this manner, the subcontext type MUST have a no-arg constructor. If the requested subcontext does not conform to this convention, auto-creation will fail.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	BaseContext.ContextSetNoRemoveIteratorDecorator Iterator decorator which disallows the remove() operation on the iterator.

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	autoCreateSubcontexts Flag indicating whether subcontexts should, by default, be created if they do not exist.
private Logger	log Logger.
private BaseContext	parent The owning parent context.
private net.shibboleth.utilities.java.support.collection.ClassIndexedSet<BaseContext>	subcontexts The subcontexts being managed.

Constructor Summary

Constructors

Constructor and Description
BaseContext() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
BaseContext	addSubcontext(BaseContext subContext) Add a subcontext to the current context.
BaseContext	addSubcontext(BaseContext subcontext, boolean replace) Add a subcontext to the current context.
void	clearSubcontexts() Clear the subcontexts of the current context.
<T extends BaseContext> boolean	containsSubcontext(Class<T> clazz) Return whether the current context currently contains an instance of the specified subcontext class.
protected <T extends BaseContext> T	createSubcontext(Class<T> clazz) Create an instance of the specified subcontext class.
BaseContext	getParent() Get the parent context, if there is one.
<T extends BaseContext> T	getSubcontext(Class<T> clazz) Get a subcontext of the current context.
<T extends BaseContext> T	getSubcontext(Class<T> clazz, boolean autocreate) Get a subcontext of the current context.
BaseContext	getSubcontext(String className) Get a subcontext of the current context.
BaseContext	getSubcontext(String className, boolean autocreate) Get a subcontext of the current context.
boolean	isAutoCreateSubcontexts() Get whether the context auto-creates subcontexts by default.
Iterator<BaseContext>	iterator()
void	removeSubcontext(BaseContext subcontext) Remove a subcontext from the current context.
<T extends BaseContext> void	removeSubcontext(Class<T> clazz) Remove the subcontext from the current context which corresponds to the supplied class.
void	setAutoCreateSubcontexts(boolean autoCreate) Set whether the context auto-creates subcontexts by default.
protected void	setParent(BaseContext newParent) Set the context parent.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

log

@Nonnull
private final Logger log

Logger.

parent

@Nullable
private BaseContext parent

The owning parent context.

subcontexts

@Nonnull
@NonnullElements
private net.shibboleth.utilities.java.support.collection.ClassIndexedSet<BaseContext> subcontexts

The subcontexts being managed.

autoCreateSubcontexts

private boolean autoCreateSubcontexts

Flag indicating whether subcontexts should, by default, be created if they do not exist.

Constructor Detail

BaseContext

public BaseContext()

Constructor. Generates a random context id.

Method Detail

getParent

@Nullable
public BaseContext getParent()

Get the parent context, if there is one.

Returns:

the parent context or null

setParent

protected void setParent(@Nullable
             BaseContext newParent)

Set the context parent.

Parameters:

newParent - the new context parent

getSubcontext

@Nullable
public <T extends BaseContext> T getSubcontext(@Nonnull
                                               Class<T> clazz)

Get a subcontext of the current context.

Type Parameters:

T - the type of subcontext being operated on

Parameters:

clazz - the class type to obtain

Returns:

the held instance of the class, or null

getSubcontext

@Nullable
public <T extends BaseContext> T getSubcontext(@Nonnull
                                               Class<T> clazz,
                                               boolean autocreate)

Get a subcontext of the current context.

Type Parameters:

T - the type of subcontext being operated on

Parameters:

clazz - the class type to obtain

autocreate - flag indicating whether the subcontext instance should be auto-created

Returns:

the held instance of the class, or null

getSubcontext

@Nullable
public BaseContext getSubcontext(@Nonnull@NotEmpty
                                 String className)
                          throws ClassNotFoundException

Get a subcontext of the current context.

Parameters:

className - the name of the class type to obtain

Returns:

the held instance of the class, or null

Throws:

ClassNotFoundException

getSubcontext

@Nullable
public BaseContext getSubcontext(@Nonnull@NotEmpty
                                 String className,
                                 boolean autocreate)
                          throws ClassNotFoundException

Get a subcontext of the current context.

Parameters:

className - the name of the class type to obtain

autocreate - flag indicating whether the subcontext instance should be auto-created

Returns:

the held instance of the class, or null

Throws:

ClassNotFoundException

addSubcontext

@Nonnull
public BaseContext addSubcontext(@Nonnull
                                BaseContext subContext)

Add a subcontext to the current context.

Parameters:

subContext - the subcontext to add

Returns:

the context added

addSubcontext

@Nonnull
public BaseContext addSubcontext(@Nonnull
                                BaseContext subcontext,
                                boolean replace)

Add a subcontext to the current context.

Parameters:

subcontext - the subcontext to add

replace - flag indicating whether to replace the existing instance of the subcontext if present

Returns:

the context added

removeSubcontext

public void removeSubcontext(@Nonnull
                    BaseContext subcontext)

Remove a subcontext from the current context.

Parameters:

subcontext - the subcontext to remove

removeSubcontext

public <T extends BaseContext> void removeSubcontext(@Nonnull
                                            Class<T> clazz)

Remove the subcontext from the current context which corresponds to the supplied class.

Type Parameters:

T - the type of subcontext being operated on

Parameters:

clazz - the subcontext class to remove

containsSubcontext

public <T extends BaseContext> boolean containsSubcontext(@Nonnull
                                                 Class<T> clazz)

Return whether the current context currently contains an instance of the specified subcontext class.

Type Parameters:

T - the type of subcontext being operated on

Parameters:

clazz - the class to check

Returns:

true if the current context contains an instance of the class, false otherwise

clearSubcontexts

public void clearSubcontexts()

Clear the subcontexts of the current context.

isAutoCreateSubcontexts

public boolean isAutoCreateSubcontexts()

Get whether the context auto-creates subcontexts by default.

Returns:

true if the context auto-creates subcontexts, false otherwise

setAutoCreateSubcontexts

public void setAutoCreateSubcontexts(boolean autoCreate)

Set whether the context auto-creates subcontexts by default.

Parameters:

autoCreate - whether the context should auto-create subcontexts

iterator

@Nonnull
public Iterator<BaseContext> iterator()

Specified by:

iterator in interface Iterable<BaseContext>

createSubcontext

@Nonnull
protected <T extends BaseContext> T createSubcontext(@Nonnull
                                                 Class<T> clazz)

Create an instance of the specified subcontext class.

Type Parameters:

T - the type of subcontext

Parameters:

clazz - the class of the subcontext instance to create

Returns:

the new subcontext instance