com.sap.netweaver.bc.rf.util.context

Class ContextStack

java.lang.Object
  com.sap.netweaver.bc.rf.util.context.ContextStack

All Implemented Interfaces:

IContextStack

public class ContextStack

extends Object

implements IContextStack

Class holding a stack of context objects. This stack shall be used by context factories to store multiple stacked contexts within each thread. When no (more) context is available, a ContextUnavailableException is thrown.

Field Summary

protected ArrayList	contexts
protected int	contextsIndex

Constructor Summary

ContextStack()

Method Summary

Object	getTypeUnsafeContext() Get actual context from stack of contexts.
Object	getTypeUnsafeContextOrNullIfUnavailable() Get actual context from stack of contexts.
boolean	isAvailable() Checks if there is at least one actual context stacked.
Object	popTypeUnsafeContext() Get and remove actual context from the stack of contexts.
void	pushTypeUnsafeContext(Object context) Add new context to the top of the stack of contexts.
void	setTypeUnsafeContext(Object context) Replace actual context with new one in stack of contexts.
int	size() Get the number of context entries in the stack of contexts.

Methods inherited from class java.lang.Object

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

Field Detail

contexts

protected ArrayList contexts

contextsIndex

protected int contextsIndex

Constructor Detail

ContextStack

public ContextStack()

Method Detail

isAvailable

public boolean isAvailable()

Checks if there is at least one actual context stacked.

Specified by:

isAvailable in interface IContextStack

Returns:

flag indicating whether there is at least one actual context stacked

size

public int size()

Get the number of context entries in the stack of contexts.

Specified by:

size in interface IContextStack

Returns:

number of context entries in the stack of contexts

getTypeUnsafeContext

public Object getTypeUnsafeContext()
                            throws ContextUnavailableException

Get actual context from stack of contexts.

Specified by:

getTypeUnsafeContext in interface IContextStack

Returns:

actual context on the context stack

Throws:

ContextUnavailableException - when no (more) context is available on the context stack

getTypeUnsafeContextOrNullIfUnavailable

public Object getTypeUnsafeContextOrNullIfUnavailable()

Get actual context from stack of contexts. Return null if none is availble and don't throw a ContextUnavailableException.

Specified by:

getTypeUnsafeContextOrNullIfUnavailable in interface IContextStack

Returns:

actual context on the context stack

setTypeUnsafeContext

public void setTypeUnsafeContext(Object context)

Replace actual context with new one in stack of contexts. If no context is stored, this one will be added.

Specified by:

setTypeUnsafeContext in interface IContextStack

Parameters:

context - new actual context replacing the old one on the stack

popTypeUnsafeContext

public Object popTypeUnsafeContext()
                            throws ContextUnavailableException

Get and remove actual context from the stack of contexts.

Specified by:

popTypeUnsafeContext in interface IContextStack

Returns:

last actual context on the context stack

Throws:

ContextUnavailableException - when no (more) context is available on the context stack

pushTypeUnsafeContext

public void pushTypeUnsafeContext(Object context)

Add new context to the top of the stack of contexts.

Specified by:

pushTypeUnsafeContext in interface IContextStack

Parameters:

context - new actual context