Package org.apache.qpid.jms.jndi

Class ReadOnlyContext

java.lang.Object

org.apache.qpid.jms.jndi.ReadOnlyContext

All Implemented Interfaces:

Serializable, Context

Direct Known Subclasses:

LazyCreateContext

public class ReadOnlyContext
extends Object
implements Context, Serializable

A read-only Context

This version assumes it and all its sub-context are read-only and any attempt to modify (e.g. through bind) will result in an OperationNotSupportedException. Each Context in the tree builds a cache of the entries in all sub-contexts to optimize the performance of lookup.

This implementation is intended to optimize the performance of lookup(String) to about the level of a HashMap get. It has been observed that the scheme resolution phase performed by the JVM takes considerably longer, so for optimum performance lookups should be coded like: Context componentContext = (Context)new InitialContext().lookup("java:comp"); String envEntry = (String) componentContext.lookup("env/myEntry"); String envEntry2 = (String) componentContext.lookup("env/myEntry2");

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected final Map<String,Object>	bindings
protected final Hashtable<String,Object>	environment
protected static final NameParser	NAME_PARSER
static final String	SEPARATOR
protected final Map<String,Object>	treeBindings

Fields inherited from interface javax.naming.Context

APPLET, AUTHORITATIVE, BATCHSIZE, DNS_URL, INITIAL_CONTEXT_FACTORY, LANGUAGE, OBJECT_FACTORIES, PROVIDER_URL, REFERRAL, SECURITY_AUTHENTICATION, SECURITY_CREDENTIALS, SECURITY_PRINCIPAL, SECURITY_PROTOCOL, STATE_FACTORIES, URL_PKG_PREFIXES

Constructor Summary

Constructors

Modifier	Constructor	Description
	ReadOnlyContext()
	ReadOnlyContext(Hashtable env)
	ReadOnlyContext(Hashtable environment, Map<String,Object> bindings)
	ReadOnlyContext(Hashtable environment, Map<String,Object> bindings, String nameInNamespace)
protected	ReadOnlyContext(ReadOnlyContext clone, Hashtable env)
protected	ReadOnlyContext(ReadOnlyContext clone, Hashtable<String,Object> env, String nameInNamespace)

Method Summary

Modifier and Type	Method	Description
Object	addToEnvironment(String propName, Object propVal)
void	bind(String name, Object obj)
void	bind(Name name, Object obj)
void	close()
String	composeName(String name, String prefix)
Name	composeName(Name name, Name prefix)
Context	createSubcontext(String name)
Context	createSubcontext(Name name)
void	destroySubcontext(String name)
void	destroySubcontext(Name name)
Hashtable<String,Object>	getEnvironment()
String	getNameInNamespace()
NameParser	getNameParser(String name)
NameParser	getNameParser(Name name)
protected Map<String,Object>	internalBind(String name, Object value)	internalBind is intended for use only during setup or possibly by suitably synchronized super-classes.
NamingEnumeration	list(String name)
NamingEnumeration	list(Name name)
NamingEnumeration	listBindings(String name)
NamingEnumeration	listBindings(Name name)
Object	lookup(String name)
Object	lookup(Name name)
Object	lookupLink(String name)
Object	lookupLink(Name name)
protected ReadOnlyContext	newContext()
void	rebind(String name, Object obj)
void	rebind(Name name, Object obj)
Object	removeFromEnvironment(String propName)
void	rename(String oldName, String newName)
void	rename(Name oldName, Name newName)
void	unbind(String name)
void	unbind(Name name)

Methods inherited from class java.lang.Object

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

Field Details

SEPARATOR

public static final String SEPARATOR

See Also:

• Constant Field Values

NAME_PARSER

protected static final NameParser NAME_PARSER

environment

protected final Hashtable<String,Object> environment

bindings

protected final Map<String,Object> bindings

treeBindings

protected final Map<String,Object> treeBindings

Constructor Details

ReadOnlyContext

public ReadOnlyContext()

ReadOnlyContext

public ReadOnlyContext(Hashtable env)

ReadOnlyContext

public ReadOnlyContext(Hashtable environment,
 Map<String,Object> bindings)

ReadOnlyContext

public ReadOnlyContext(Hashtable environment,
 Map<String,Object> bindings,
 String nameInNamespace)

ReadOnlyContext

protected ReadOnlyContext(ReadOnlyContext clone,
 Hashtable env)

ReadOnlyContext

protected ReadOnlyContext(ReadOnlyContext clone,
 Hashtable<String,Object> env,
 String nameInNamespace)

Method Details

internalBind

protected Map<String,Object> internalBind(String name,
 Object value)
                                   throws NamingException

internalBind is intended for use only during setup or possibly by suitably synchronized super-classes. It binds every possible lookup into a map in each context. To do this, each context strips off one name segment and if necessary creates a new context for it. Then it asks that context to bind the remaining name. It returns a map containing all the bindings from the next context, plus the context it just created (if it in fact created it). (the names are suitably extended by the segment originally lopped off).

Parameters:

name - the name of the context to bind.

value - the value to be bound.

Returns:

a map populated from the previous and current context.

Throws:

NamingException - if an error occurs during the bind.

newContext

protected ReadOnlyContext newContext()

addToEnvironment

public Object addToEnvironment(String propName,
 Object propVal)
                        throws NamingException

Specified by:

addToEnvironment in interface Context

Throws:

NamingException

getEnvironment

public Hashtable<String,Object> getEnvironment()
                                        throws NamingException

Specified by:

getEnvironment in interface Context

Throws:

NamingException

removeFromEnvironment

public Object removeFromEnvironment(String propName)
                             throws NamingException

Specified by:

removeFromEnvironment in interface Context

Throws:

NamingException

lookup

public Object lookup(String name)
              throws NamingException

Specified by:

lookup in interface Context

Throws:

NamingException

lookup

public Object lookup(Name name)
              throws NamingException

Specified by:

lookup in interface Context

Throws:

NamingException

lookupLink

public Object lookupLink(String name)
                  throws NamingException

Specified by:

lookupLink in interface Context

Throws:

NamingException

composeName

public Name composeName(Name name,
 Name prefix)
                 throws NamingException

Specified by:

composeName in interface Context

Throws:

NamingException

composeName

public String composeName(String name,
 String prefix)
                   throws NamingException

Specified by:

composeName in interface Context

Throws:

NamingException

list

public NamingEnumeration list(String name)
                       throws NamingException

Specified by:

list in interface Context

Throws:

NamingException

listBindings

public NamingEnumeration listBindings(String name)
                               throws NamingException

Specified by:

listBindings in interface Context

Throws:

NamingException

lookupLink

public Object lookupLink(Name name)
                  throws NamingException

Specified by:

lookupLink in interface Context

Throws:

NamingException

list

public NamingEnumeration list(Name name)
                       throws NamingException

Specified by:

list in interface Context

Throws:

NamingException

listBindings

public NamingEnumeration listBindings(Name name)
                               throws NamingException

Specified by:

listBindings in interface Context

Throws:

NamingException

bind

public void bind(Name name,
 Object obj)
          throws NamingException

Specified by:

bind in interface Context

Throws:

NamingException

bind

public void bind(String name,
 Object obj)
          throws NamingException

Specified by:

bind in interface Context

Throws:

NamingException

close

public void close()
           throws NamingException

Specified by:

close in interface Context

Throws:

NamingException

createSubcontext

public Context createSubcontext(Name name)
                         throws NamingException

Specified by:

createSubcontext in interface Context

Throws:

NamingException

createSubcontext

public Context createSubcontext(String name)
                         throws NamingException

Specified by:

createSubcontext in interface Context

Throws:

NamingException

destroySubcontext

public void destroySubcontext(Name name)
                       throws NamingException

Specified by:

destroySubcontext in interface Context

Throws:

NamingException

destroySubcontext

public void destroySubcontext(String name)
                       throws NamingException

Specified by:

destroySubcontext in interface Context

Throws:

NamingException

getNameInNamespace

public String getNameInNamespace()
                          throws NamingException

Specified by:

getNameInNamespace in interface Context

Throws:

NamingException

getNameParser

public NameParser getNameParser(Name name)
                         throws NamingException

Specified by:

getNameParser in interface Context

Throws:

NamingException

getNameParser

public NameParser getNameParser(String name)
                         throws NamingException

Specified by:

getNameParser in interface Context

Throws:

NamingException

rebind

public void rebind(Name name,
 Object obj)
            throws NamingException

Specified by:

rebind in interface Context

Throws:

NamingException

rebind

public void rebind(String name,
 Object obj)
            throws NamingException

Specified by:

rebind in interface Context

Throws:

NamingException

rename

public void rename(Name oldName,
 Name newName)
            throws NamingException

Specified by:

rename in interface Context

Throws:

NamingException

rename

public void rename(String oldName,
 String newName)
            throws NamingException

Specified by:

rename in interface Context

Throws:

NamingException

unbind

public void unbind(Name name)
            throws NamingException

Specified by:

unbind in interface Context

Throws:

NamingException

unbind

public void unbind(String name)
            throws NamingException

Specified by:

unbind in interface Context

Throws:

NamingException