public class InitialContext extends Object implements Context
All naming operations are relative to a context. The initial context implements the Context interface and provides the starting point for resolution of names.
When the initial context is constructed, its environment
is initialized with properties defined in the environment parameter
passed to the constructor, and in any
application resource files.
In addition, a small number of standard JNDI properties may
be specified as system properties or as applet parameters
(through the use of Context.APPLET).
These special properties are listed in the field detail sections of the
Context and
LdapContext
interface documentation.
JNDI determines each property's value by merging the values from the following two sources, in order:
The initial context implementation is determined at runtime.
The default policy uses the environment property
"java.naming.factory.initial",
which contains the class name of the initial context factory.
An exception to this policy is made when resolving URL strings, as described
below.
When a URL string (a String of the form
scheme_id:rest_of_name) is passed as a name parameter to
any method, a URL context factory for handling that scheme is
located and used to resolve the URL. If no such factory is found,
the initial context specified by
"java.naming.factory.initial" is used. Similarly, when a
CompositeName object whose first component is a URL string is
passed as a name parameter to any method, a URL context factory is
located and used to resolve the first name component.
See NamingManager.getURLContext() for a description of how URL
context factories are located.
This default policy of locating the initial context and URL context factories may be overridden by calling NamingManager.setInitialContextFactoryBuilder().
NoInitialContextException is thrown when an initial context cannot be instantiated. This exception can be thrown during any interaction with the InitialContext, not only when the InitialContext is constructed. For example, the implementation of the initial context might lazily retrieve the context only when actual methods are invoked on it. The application should not have any dependency on when the existence of an initial context is determined.
When the environment property "java.naming.factory.initial" is non-null, the InitialContext constructor will attempt to create the initial context specified therein. At that time, the initial context factory involved might throw an exception if a problem is encountered. However, it is provider implementation-dependent when it verifies and indicates to the users of the initial context any environment property- or connection- related problems. It can do so lazily--delaying until an operation is performed on the context, or eagerly, at the time the context is constructed.
An InitialContext instance is not synchronized against concurrent access by multiple threads. Multiple threads each manipulating a different InitialContext instance need not synchronize. Threads that need to access a single InitialContext instance concurrently should synchronize amongst themselves and provide the necessary locking.
Context,
NamingManager.setInitialContextFactoryBuilder| Modifier and Type | Field and Description |
|---|---|
protected Context |
defaultInitCtx
Field holding the result of calling NamingManager.getInitialContext().
|
protected boolean |
gotDefault
Field indicating whether the initial context has been obtained
by calling NamingManager.getInitialContext().
|
protected Hashtable<Object,Object> |
myProps
The environment associated with this InitialContext.
|
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| Modifier | Constructor and Description |
|---|---|
|
InitialContext()
Constructs an initial context.
|
protected |
InitialContext(boolean lazy)
Constructs an initial context with the option of not
initializing it.
|
|
InitialContext(Hashtable<?,?> environment)
Constructs an initial context using the supplied environment.
|
| Modifier and Type | Method and Description |
|---|---|
Object |
addToEnvironment(String propName,
Object propVal)
Adds a new environment property to the environment of this
context.
|
void |
bind(Name name,
Object obj)
Binds a name to an object.
|
void |
bind(String name,
Object obj)
Binds a name to an object.
|
void |
close()
Closes this context.
|
Name |
composeName(Name name,
Name prefix)
Composes the name of this context with a name relative to
this context.
|
String |
composeName(String name,
String prefix)
Composes the name of this context with a name relative to
this context.
|
Context |
createSubcontext(Name name)
Creates and binds a new context.
|
Context |
createSubcontext(String name)
Creates and binds a new context.
|
void |
destroySubcontext(Name name)
Destroys the named context and removes it from the namespace.
|
void |
destroySubcontext(String name)
Destroys the named context and removes it from the namespace.
|
static <T> T |
doLookup(Name name)
A static method to retrieve the named object.
|
static <T> T |
doLookup(String name)
A static method to retrieve the named object.
|
protected Context |
getDefaultInitCtx()
Retrieves the initial context by calling
NamingManager.getInitialContext()
and cache it in defaultInitCtx. |
Hashtable<?,?> |
getEnvironment()
Retrieves the environment in effect for this context.
|
String |
getNameInNamespace()
Retrieves the full name of this context within its own namespace.
|
NameParser |
getNameParser(Name name)
Retrieves the parser associated with the named context.
|
NameParser |
getNameParser(String name)
Retrieves the parser associated with the named context.
|
protected Context |
getURLOrDefaultInitCtx(Name name)
Retrieves a context for resolving
name. |
protected Context |
getURLOrDefaultInitCtx(String name)
Retrieves a context for resolving the string name
name. |
protected void |
init(Hashtable<?,?> environment)
Initializes the initial context using the supplied environment.
|
NamingEnumeration<NameClassPair> |
list(Name name)
Enumerates the names bound in the named context, along with the
class names of objects bound to them.
|
NamingEnumeration<NameClassPair> |
list(String name)
Enumerates the names bound in the named context, along with the
class names of objects bound to them.
|
NamingEnumeration<Binding> |
listBindings(Name name)
Enumerates the names bound in the named context, along with the
objects bound to them.
|
NamingEnumeration<Binding> |
listBindings(String name)
Enumerates the names bound in the named context, along with the
objects bound to them.
|
Object |
lookup(Name name)
Retrieves the named object.
|
Object |
lookup(String name)
Retrieves the named object.
|
Object |
lookupLink(Name name)
Retrieves the named object, following links except
for the terminal atomic component of the name.
|
Object |
lookupLink(String name)
Retrieves the named object, following links except
for the terminal atomic component of the name.
|
void |
rebind(Name name,
Object obj)
Binds a name to an object, overwriting any existing binding.
|
void |
rebind(String name,
Object obj)
Binds a name to an object, overwriting any existing binding.
|
Object |
removeFromEnvironment(String propName)
Removes an environment property from the environment of this
context.
|
void |
rename(Name oldName,
Name newName)
Binds a new name to the object bound to an old name, and unbinds
the old name.
|
void |
rename(String oldName,
String newName)
Binds a new name to the object bound to an old name, and unbinds
the old name.
|
void |
unbind(Name name)
Unbinds the named object.
|
void |
unbind(String name)
Unbinds the named object.
|
protected Hashtable<Object,Object> myProps
protected Context defaultInitCtx
getDefaultInitCtx()protected boolean gotDefault
defaultInitCtx.protected InitialContext(boolean lazy)
throws NamingException
lazy - true means do not initialize the initial context; false
is equivalent to calling new InitialContext()NamingException - if a naming exception is encounteredinit(Hashtable)public InitialContext()
throws NamingException
NamingException - if a naming exception is encounteredInitialContext(Hashtable)public InitialContext(Hashtable<?,?> environment) throws NamingException
This constructor will not modify environment or save a reference to it, but may save a clone. Caller should not modify mutable keys and values in environment after it has been passed to the constructor.
environment - environment used to create the initial context.
Null indicates an empty environment.NamingException - if a naming exception is encounteredprotected void init(Hashtable<?,?> environment) throws NamingException
This method will modify environment and save a reference to it. The caller may no longer modify it.
environment - environment used to create the initial context.
Null indicates an empty environment.NamingException - if a naming exception is encounteredInitialContext(boolean)public static <T> T doLookup(Name name) throws NamingException
InitialContext ic = new InitialContext();
Object obj = ic.lookup();
If name is empty, returns a new instance of this context (which represents the same naming context as this context, but its environment may be modified independently and it may be accessed concurrently).
name - the name of the object to look upNamingException - if a naming exception is encountereddoLookup(String),
lookup(Name)public static <T> T doLookup(String name) throws NamingException
doLookup(Name) for details.name - the name of the object to look upNamingException - if a naming exception is encounteredprotected Context getDefaultInitCtx() throws NamingException
NamingManager.getInitialContext()
and cache it in defaultInitCtx.
Set gotDefault so that we know we've tried this before.NoInitialContextException - If cannot find an initial context.NamingException - If a naming exception was encountered.protected Context getURLOrDefaultInitCtx(String name) throws NamingException
name.
If name name is a URL string, then attempt
to find a URL context for it. If none is found, or if
name is not a URL string, then return
getDefaultInitCtx().
See getURLOrDefaultInitCtx(Name) for description of how a subclass should use this method.
name - The non-null name for which to get the context.name or the cached
initial context. The result cannot be null.NoInitialContextException - If cannot find an initial context.NamingException - In a naming exception is encountered.NamingManager.getURLContext(java.lang.String, java.util.Hashtable<?, ?>)protected Context getURLOrDefaultInitCtx(Name name) throws NamingException
name.
If the first component of name name is a URL string,
then attempt to find a URL context for it. If none is found, or if
the first component of name is not a URL string,
then return getDefaultInitCtx().
When creating a subclass of InitialContext, use this method as follows. Define a new method that uses this method to get an initial context of the desired subclass.
protected XXXContext getURLOrDefaultInitXXXCtx(Name name)
throws NamingException {
Context answer = getURLOrDefaultInitCtx(name);
if (!(answer instanceof XXXContext)) {
if (answer == null) {
throw new NoInitialContextException();
} else {
throw new NotContextException("Not an XXXContext");
}
}
return (XXXContext)answer;
}
public Object XXXMethod1(Name name, ...) {
throws NamingException {
return getURLOrDefaultInitXXXCtx(name).XXXMethod1(name, ...);
}
name - The non-null name for which to get the context.name or the cached
initial context. The result cannot be null.NoInitialContextException - If cannot find an initial context.NamingException - In a naming exception is encountered.NamingManager.getURLContext(java.lang.String, java.util.Hashtable<?, ?>)public Object lookup(String name) throws NamingException
ContextContext.lookup(Name) for details.lookup in interface Contextname - the name of the object to look upNamingException - if a naming exception is encounteredpublic Object lookup(Name name) throws NamingException
Contextlookup in interface Contextname - the name of the object to look upNamingException - if a naming exception is encounteredContext.lookup(String),
Context.lookupLink(Name)public void bind(String name, Object obj) throws NamingException
ContextContext.bind(Name, Object) for details.bind in interface Contextname - the name to bind; may not be emptyobj - the object to bind; possibly nullNameAlreadyBoundException - if name is already boundInvalidAttributesException - if object did not supply all mandatory attributesNamingException - if a naming exception is encounteredpublic void bind(Name name, Object obj) throws NamingException
Contextbind in interface Contextname - the name to bind; may not be emptyobj - the object to bind; possibly nullNameAlreadyBoundException - if name is already boundInvalidAttributesException - if object did not supply all mandatory attributesNamingException - if a naming exception is encounteredContext.bind(String, Object),
Context.rebind(Name, Object),
DirContext.bind(Name, Object,
javax.naming.directory.Attributes)public void rebind(String name, Object obj) throws NamingException
ContextContext.rebind(Name, Object) for details.rebind in interface Contextname - the name to bind; may not be emptyobj - the object to bind; possibly nullInvalidAttributesException - if object did not supply all mandatory attributesNamingException - if a naming exception is encounteredpublic void rebind(Name name, Object obj) throws NamingException
ContextIf the object is a DirContext, any existing attributes associated with the name are replaced with those of the object. Otherwise, any existing attributes associated with the name remain unchanged.
rebind in interface Contextname - the name to bind; may not be emptyobj - the object to bind; possibly nullInvalidAttributesException - if object did not supply all mandatory attributesNamingException - if a naming exception is encounteredContext.rebind(String, Object),
Context.bind(Name, Object),
DirContext.rebind(Name, Object,
javax.naming.directory.Attributes),
DirContextpublic void unbind(String name) throws NamingException
ContextContext.unbind(Name) for details.unbind in interface Contextname - the name to unbind; may not be emptyNameNotFoundException - if an intermediate context does not existNamingException - if a naming exception is encounteredpublic void unbind(Name name) throws NamingException
Contextname
from the target context--that named by all but the terminal
atomic part of name.
This method is idempotent. It succeeds even if the terminal atomic name is not bound in the target context, but throws NameNotFoundException if any of the intermediate contexts do not exist.
Any attributes associated with the name are removed. Intermediate contexts are not changed.
unbind in interface Contextname - the name to unbind; may not be emptyNameNotFoundException - if an intermediate context does not existNamingException - if a naming exception is encounteredContext.unbind(String)public void rename(String oldName, String newName) throws NamingException
ContextContext.rename(Name, Name) for details.rename in interface ContextoldName - the name of the existing binding; may not be emptynewName - the name of the new binding; may not be emptyNameAlreadyBoundException - if newName is already boundNamingException - if a naming exception is encounteredpublic void rename(Name oldName, Name newName) throws NamingException
Contextrename in interface ContextoldName - the name of the existing binding; may not be emptynewName - the name of the new binding; may not be emptyNameAlreadyBoundException - if newName is already boundNamingException - if a naming exception is encounteredContext.rename(String, String),
Context.bind(Name, Object),
Context.rebind(Name, Object)public NamingEnumeration<NameClassPair> list(String name) throws NamingException
ContextContext.list(Name) for details.list in interface Contextname - the name of the context to listNamingException - if a naming exception is encounteredpublic NamingEnumeration<NameClassPair> list(Name name) throws NamingException
ContextIf a binding is added to or removed from this context, its effect on an enumeration previously returned is undefined.
list in interface Contextname - the name of the context to listNamingException - if a naming exception is encounteredContext.list(String),
Context.listBindings(Name),
NameClassPairpublic NamingEnumeration<Binding> listBindings(String name) throws NamingException
ContextContext.listBindings(Name) for details.listBindings in interface Contextname - the name of the context to listNamingException - if a naming exception is encounteredpublic NamingEnumeration<Binding> listBindings(Name name) throws NamingException
ContextIf a binding is added to or removed from this context, its effect on an enumeration previously returned is undefined.
listBindings in interface Contextname - the name of the context to listNamingException - if a naming exception is encounteredContext.listBindings(String),
Context.list(Name),
Bindingpublic void destroySubcontext(String name) throws NamingException
ContextContext.destroySubcontext(Name) for details.destroySubcontext in interface Contextname - the name of the context to be destroyed; may not be emptyNameNotFoundException - if an intermediate context does not existNotContextException - if the name is bound but does not name a
context, or does not name a context of the appropriate typeContextNotEmptyException - if the named context is not emptyNamingException - if a naming exception is encounteredpublic void destroySubcontext(Name name) throws NamingException
ContextThis method is idempotent. It succeeds even if the terminal atomic name is not bound in the target context, but throws NameNotFoundException if any of the intermediate contexts do not exist.
In a federated naming system, a context from one naming system may be bound to a name in another. One can subsequently look up and perform operations on the foreign context using a composite name. However, an attempt destroy the context using this composite name will fail with NotContextException, because the foreign context is not a "subcontext" of the context in which it is bound. Instead, use unbind() to remove the binding of the foreign context. Destroying the foreign context requires that the destroySubcontext() be performed on a context from the foreign context's "native" naming system.
destroySubcontext in interface Contextname - the name of the context to be destroyed; may not be emptyNameNotFoundException - if an intermediate context does not existNotContextException - if the name is bound but does not name a
context, or does not name a context of the appropriate typeContextNotEmptyException - if the named context is not emptyNamingException - if a naming exception is encounteredContext.destroySubcontext(String)public Context createSubcontext(String name) throws NamingException
ContextContext.createSubcontext(Name) for details.createSubcontext in interface Contextname - the name of the context to create; may not be emptyNameAlreadyBoundException - if name is already boundInvalidAttributesException - if creation of the subcontext requires specification of
mandatory attributesNamingException - if a naming exception is encounteredpublic Context createSubcontext(Name name) throws NamingException
ContextcreateSubcontext in interface Contextname - the name of the context to create; may not be emptyNameAlreadyBoundException - if name is already boundInvalidAttributesException - if creation of the subcontext requires specification of
mandatory attributesNamingException - if a naming exception is encounteredContext.createSubcontext(String),
DirContext.createSubcontext(javax.naming.Name, javax.naming.directory.Attributes)public Object lookupLink(String name) throws NamingException
ContextContext.lookupLink(Name) for details.lookupLink in interface Contextname - the name of the object to look upNamingException - if a naming exception is encounteredpublic Object lookupLink(Name name) throws NamingException
ContextlookupLink in interface Contextname - the name of the object to look upNamingException - if a naming exception is encounteredContext.lookupLink(String)public NameParser getNameParser(String name) throws NamingException
ContextContext.getNameParser(Name) for details.getNameParser in interface Contextname - the name of the context from which to get the parserNamingException - if a naming exception is encounteredpublic NameParser getNameParser(Name name) throws NamingException
ContextgetNameParser in interface Contextname - the name of the context from which to get the parserNamingException - if a naming exception is encounteredContext.getNameParser(String),
CompoundNamepublic String composeName(String name, String prefix) throws NamingException
composeName in interface Contextname - a name relative to this contextprefix - the name of this context relative to one of its ancestorsprefix and nameNamingException - if a naming exception is encounteredpublic Name composeName(Name name, Name prefix) throws NamingException
composeName in interface Contextname - a name relative to this contextprefix - the name of this context relative to one of its ancestorsprefix and nameNamingException - if a naming exception is encounteredContext.composeName(String, String)public Object addToEnvironment(String propName, Object propVal) throws NamingException
ContextaddToEnvironment in interface ContextpropName - the name of the environment property to add; may not be nullpropVal - the value of the property to add; may not be nullNamingException - if a naming exception is encounteredContext.getEnvironment(),
Context.removeFromEnvironment(String)public Object removeFromEnvironment(String propName) throws NamingException
ContextremoveFromEnvironment in interface ContextpropName - the name of the environment property to remove; may not be nullNamingException - if a naming exception is encounteredContext.getEnvironment(),
Context.addToEnvironment(String, Object)public Hashtable<?,?> getEnvironment() throws NamingException
ContextThe caller should not make any changes to the object returned: their effect on the context is undefined. The environment of this context may be changed using addToEnvironment() and removeFromEnvironment().
getEnvironment in interface ContextNamingException - if a naming exception is encounteredContext.addToEnvironment(String, Object),
Context.removeFromEnvironment(String)public void close()
throws NamingException
ContextThis method is idempotent: invoking it on a context that has already been closed has no effect. Invoking any other method on a closed context is not allowed, and results in undefined behaviour.
close in interface ContextNamingException - if a naming exception is encounteredpublic String getNameInNamespace() throws NamingException
ContextMany naming services have a notion of a "full name" for objects in their respective namespaces. For example, an LDAP entry has a distinguished name, and a DNS record has a fully qualified name. This method allows the client application to retrieve this name. The string returned by this method is not a JNDI composite name and should not be passed directly to context methods. In naming systems for which the notion of full name does not make sense, OperationNotSupportedException is thrown.
getNameInNamespace in interface ContextOperationNotSupportedException - if the naming system does
not have the notion of a full nameNamingException - if a naming exception is encountered Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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