Tomcat example source code file (SelectorContext.java)
The Tomcat SelectorContext.java source code/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.naming;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NameParser;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
/**
* Catalina JNDI Context implementation.
*
* @author Remy Maucherat
* @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
*/
public class SelectorContext implements Context {
// -------------------------------------------------------------- Constants
/**
* Namespace URL.
*/
public static final String prefix = "java:";
/**
* Namespace URL length.
*/
public static final int prefixLength = prefix.length();
/**
* Initial context prefix.
*/
public static final String IC_PREFIX = "IC_";
// ----------------------------------------------------------- Constructors
/**
* Builds a Catalina selector context using the given environment.
*/
public SelectorContext(Hashtable env) {
this.env = env;
}
/**
* Builds a Catalina selector context using the given environment.
*/
public SelectorContext(Hashtable env, boolean initialContext) {
this(env);
this.initialContext = initialContext;
}
// ----------------------------------------------------- Instance Variables
/**
* Environment.
*/
protected Hashtable env;
/**
* The string manager for this package.
*/
protected StringManager sm = StringManager.getManager(Constants.Package);
/**
* Request for an initial context.
*/
protected boolean initialContext = false;
// --------------------------------------------------------- Public Methods
// -------------------------------------------------------- Context Methods
/**
* Retrieves the named object. 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).
*
* @param name the name of the object to look up
* @return the object bound to name
* @exception NamingException if a naming exception is encountered
*/
public Object lookup(Name name)
throws NamingException {
// Strip the URL header
// Find the appropriate NamingContext according to the current bindings
// Execute the lookup on that context
return getBoundContext().lookup(parseName(name));
}
/**
* Retrieves the named object.
*
* @param name the name of the object to look up
* @return the object bound to name
* @exception NamingException if a naming exception is encountered
*/
public Object lookup(String name)
throws NamingException {
// Strip the URL header
// Find the appropriate NamingContext according to the current bindings
// Execute the lookup on that context
return getBoundContext().lookup(parseName(name));
}
/**
* Binds a name to an object. All intermediate contexts and the target
* context (that named by all but terminal atomic component of the name)
* must already exist.
*
* @param name the name to bind; may not be empty
* @param obj the object to bind; possibly null
* @exception NameAlreadyBoundException if name is already bound
* @exception InvalidAttributesException if object did not supply all
* mandatory attributes
* @exception NamingException if a naming exception is encountered
*/
public void bind(Name name, Object obj)
throws NamingException {
getBoundContext().bind(parseName(name), obj);
}
/**
* Binds a name to an object.
*
* @param name the name to bind; may not be empty
* @param obj the object to bind; possibly null
* @exception NameAlreadyBoundException if name is already bound
* @exception InvalidAttributesException if object did not supply all
* mandatory attributes
* @exception NamingException if a naming exception is encountered
*/
public void bind(String name, Object obj)
throws NamingException {
getBoundContext().bind(parseName(name), obj);
}
/**
* Binds a name to an object, overwriting any existing binding. All
* intermediate contexts and the target context (that named by all but
* terminal atomic component of the name) must already exist.
* <p>
* If 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.
*
* @param name the name to bind; may not be empty
* @param obj the object to bind; possibly null
* @exception InvalidAttributesException if object did not supply all
* mandatory attributes
* @exception NamingException if a naming exception is encountered
*/
public void rebind(Name name, Object obj)
throws NamingException {
getBoundContext().rebind(parseName(name), obj);
}
/**
* Binds a name to an object, overwriting any existing binding.
*
* @param name the name to bind; may not be empty
* @param obj the object to bind; possibly null
* @exception InvalidAttributesException if object did not supply all
* mandatory attributes
* @exception NamingException if a naming exception is encountered
*/
public void rebind(String name, Object obj)
throws NamingException {
getBoundContext().rebind(parseName(name), obj);
}
/**
* Unbinds the named object. Removes the terminal atomic name in name
* from the target context--that named by all but the terminal atomic
* part of name.
* <p>
* 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.
*
* @param name the name to bind; may not be empty
* @exception NameNotFoundException if an intermediate context does not
* exist
* @exception NamingException if a naming exception is encountered
*/
public void unbind(Name name)
throws NamingException {
getBoundContext().unbind(parseName(name));
}
/**
* Unbinds the named object.
*
* @param name the name to bind; may not be empty
* @exception NameNotFoundException if an intermediate context does not
* exist
* @exception NamingException if a naming exception is encountered
*/
public void unbind(String name)
throws NamingException {
getBoundContext().unbind(parseName(name));
}
/**
* Binds a new name to the object bound to an old name, and unbinds the
* old name. Both names are relative to this context. Any attributes
* associated with the old name become associated with the new name.
* Intermediate contexts of the old name are not changed.
*
* @param oldName the name of the existing binding; may not be empty
* @param newName the name of the new binding; may not be empty
* @exception NameAlreadyBoundException if newName is already bound
* @exception NamingException if a naming exception is encountered
*/
public void rename(Name oldName, Name newName)
throws NamingException {
getBoundContext().rename(parseName(oldName), parseName(newName));
}
/**
* Binds a new name to the object bound to an old name, and unbinds the
* old name.
*
* @param oldName the name of the existing binding; may not be empty
* @param newName the name of the new binding; may not be empty
* @exception NameAlreadyBoundException if newName is already bound
* @exception NamingException if a naming exception is encountered
*/
public void rename(String oldName, String newName)
throws NamingException {
getBoundContext().rename(parseName(oldName), parseName(newName));
}
/**
* Enumerates the names bound in the named context, along with the class
* names of objects bound to them. The contents of any subcontexts are
* not included.
* <p>
* If a binding is added to or removed from this context, its effect on
* an enumeration previously returned is undefined.
*
* @param name the name of the context to list
* @return an enumeration of the names and class names of the bindings in
* this context. Each element of the enumeration is of type NameClassPair.
* @exception NamingException if a naming exception is encountered
*/
public NamingEnumeration list(Name name)
throws NamingException {
return getBoundContext().list(parseName(name));
}
/**
* Enumerates the names bound in the named context, along with the class
* names of objects bound to them.
*
* @param name the name of the context to list
* @return an enumeration of the names and class names of the bindings in
* this context. Each element of the enumeration is of type NameClassPair.
* @exception NamingException if a naming exception is encountered
*/
public NamingEnumeration list(String name)
throws NamingException {
return getBoundContext().list(parseName(name));
}
/**
* Enumerates the names bound in the named context, along with the
* objects bound to them. The contents of any subcontexts are not
* included.
* <p>
* If a binding is added to or removed from this context, its effect on
* an enumeration previously returned is undefined.
*
* @param name the name of the context to list
* @return an enumeration of the bindings in this context.
* Each element of the enumeration is of type Binding.
* @exception NamingException if a naming exception is encountered
*/
public NamingEnumeration listBindings(Name name)
throws NamingException {
return getBoundContext().listBindings(parseName(name));
}
/**
* Enumerates the names bound in the named context, along with the
* objects bound to them.
*
* @param name the name of the context to list
* @return an enumeration of the bindings in this context.
* Each element of the enumeration is of type Binding.
* @exception NamingException if a naming exception is encountered
*/
public NamingEnumeration listBindings(String name)
throws NamingException {
return getBoundContext().listBindings(parseName(name));
}
/**
* Destroys the named context and removes it from the namespace. Any
* attributes associated with the name are also removed. Intermediate
* contexts are not destroyed.
* <p>
* 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.
*
* 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.
*
* @param name the name of the context to be destroyed; may not be empty
* @exception NameNotFoundException if an intermediate context does not
* exist
* @exception NotContextException if the name is bound but does not name
* a context, or does not name a context of the appropriate type
*/
public void destroySubcontext(Name name)
throws NamingException {
getBoundContext().destroySubcontext(parseName(name));
}
/**
* Destroys the named context and removes it from the namespace.
*
* @param name the name of the context to be destroyed; may not be empty
* @exception NameNotFoundException if an intermediate context does not
* exist
* @exception NotContextException if the name is bound but does not name
* a context, or does not name a context of the appropriate type
*/
public void destroySubcontext(String name)
throws NamingException {
getBoundContext().destroySubcontext(parseName(name));
}
/**
* Creates and binds a new context. Creates a new context with the given
* name and binds it in the target context (that named by all but
* terminal atomic component of the name). All intermediate contexts and
* the target context must already exist.
*
* @param name the name of the context to create; may not be empty
* @return the newly created context
* @exception NameAlreadyBoundException if name is already bound
* @exception InvalidAttributesException if creation of the subcontext
* requires specification of mandatory attributes
* @exception NamingException if a naming exception is encountered
*/
public Context createSubcontext(Name name)
throws NamingException {
return getBoundContext().createSubcontext(parseName(name));
}
/**
* Creates and binds a new context.
*
* @param name the name of the context to create; may not be empty
* @return the newly created context
* @exception NameAlreadyBoundException if name is already bound
* @exception InvalidAttributesException if creation of the subcontext
* requires specification of mandatory attributes
* @exception NamingException if a naming exception is encountered
*/
public Context createSubcontext(String name)
throws NamingException {
return getBoundContext().createSubcontext(parseName(name));
}
/**
* Retrieves the named object, following links except for the terminal
* atomic component of the name. If the object bound to name is not a
* link, returns the object itself.
*
* @param name the name of the object to look up
* @return the object bound to name, not following the terminal link
* (if any).
* @exception NamingException if a naming exception is encountered
*/
public Object lookupLink(Name name)
throws NamingException {
return getBoundContext().lookupLink(parseName(name));
}
/**
* Retrieves the named object, following links except for the terminal
* atomic component of the name.
*
* @param name the name of the object to look up
* @return the object bound to name, not following the terminal link
* (if any).
* @exception NamingException if a naming exception is encountered
*/
public Object lookupLink(String name)
throws NamingException {
return getBoundContext().lookupLink(parseName(name));
}
/**
* Retrieves the parser associated with the named context. In a
* federation of namespaces, different naming systems will parse names
* differently. This method allows an application to get a parser for
* parsing names into their atomic components using the naming convention
* of a particular naming system. Within any single naming system,
* NameParser objects returned by this method must be equal (using the
* equals() test).
*
* @param name the name of the context from which to get the parser
* @return a name parser that can parse compound names into their atomic
* components
* @exception NamingException if a naming exception is encountered
*/
public NameParser getNameParser(Name name)
throws NamingException {
return getBoundContext().getNameParser(parseName(name));
}
/**
* Retrieves the parser associated with the named context.
*
* @param name the name of the context from which to get the parser
* @return a name parser that can parse compound names into their atomic
* components
* @exception NamingException if a naming exception is encountered
*/
public NameParser getNameParser(String name)
throws NamingException {
return getBoundContext().getNameParser(parseName(name));
}
/**
* Composes the name of this context with a name relative to this context.
* <p>
* Given a name (name) relative to this context, and the name (prefix)
* of this context relative to one of its ancestors, this method returns
* the composition of the two names using the syntax appropriate for the
* naming system(s) involved. That is, if name names an object relative
* to this context, the result is the name of the same object, but
* relative to the ancestor context. None of the names may be null.
*
* @param name a name relative to this context
* @param prefix the name of this context relative to one of its ancestors
* @return the composition of prefix and name
* @exception NamingException if a naming exception is encountered
*/
public Name composeName(Name name, Name prefix)
throws NamingException {
prefix = (Name) prefix.clone();
return prefix.addAll(name);
}
/**
* Composes the name of this context with a name relative to this context.
*
* @param name a name relative to this context
* @param prefix the name of this context relative to one of its ancestors
* @return the composition of prefix and name
* @exception NamingException if a naming exception is encountered
*/
public String composeName(String name, String prefix)
throws NamingException {
return prefix + "/" + name;
}
/**
* Adds a new environment property to the environment of this context. If
* the property already exists, its value is overwritten.
*
* @param propName the name of the environment property to add; may not
* be null
* @param propVal the value of the property to add; may not be null
* @exception NamingException if a naming exception is encountered
*/
public Object addToEnvironment(String propName, Object propVal)
throws NamingException {
return getBoundContext().addToEnvironment(propName, propVal);
}
/**
* Removes an environment property from the environment of this context.
*
* @param propName the name of the environment property to remove;
* may not be null
* @exception NamingException if a naming exception is encountered
*/
public Object removeFromEnvironment(String propName)
throws NamingException {
return getBoundContext().removeFromEnvironment(propName);
}
/**
* Retrieves the environment in effect for this context. See class
* description for more details on environment properties.
* The 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().
*
* @return the environment of this context; never null
* @exception NamingException if a naming exception is encountered
*/
public Hashtable getEnvironment()
throws NamingException {
return getBoundContext().getEnvironment();
}
/**
* Closes this context. This method releases this context's resources
* immediately, instead of waiting for them to be released automatically
* by the garbage collector.
* This 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.
*
* @exception NamingException if a naming exception is encountered
*/
public void close()
throws NamingException {
getBoundContext().close();
}
/**
* Retrieves the full name of this context within its own namespace.
* <p>
* Many 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.
*
* @return this context's name in its own namespace; never null
* @exception OperationNotSupportedException if the naming system does
* not have the notion of a full name
* @exception NamingException if a naming exception is encountered
*/
public String getNameInNamespace()
throws NamingException {
return prefix;
}
// ------------------------------------------------------ Protected Methods
/**
* Get the bound context.
*/
protected Context getBoundContext()
throws NamingException {
if (initialContext) {
String ICName = IC_PREFIX;
if (ContextBindings.isThreadBound()) {
ICName += ContextBindings.getThreadName();
} else if (ContextBindings.isClassLoaderBound()) {
ICName += ContextBindings.getClassLoaderName();
}
Context initialContext = ContextBindings.getContext(ICName);
if (initialContext == null) {
// Allocating a new context and binding it to the appropriate
// name
initialContext = new NamingContext(env, ICName);
ContextBindings.bindContext(ICName, initialContext);
}
return initialContext;
} else {
if (ContextBindings.isThreadBound()) {
return ContextBindings.getThread();
} else {
return ContextBindings.getClassLoader();
}
}
}
/**
* Strips the URL header.
*
* @return the parsed name
* @exception NamingException if there is no "java:" header or if no
* naming context has been bound to this thread
*/
protected String parseName(String name)
throws NamingException {
if ((!initialContext) && (name.startsWith(prefix))) {
return (name.substring(prefixLength));
} else {
if (initialContext) {
return (name);
} else {
throw new NamingException
(sm.getString("selectorContext.noJavaUrl"));
}
}
}
/**
* Strips the URL header.
*
* @return the parsed name
* @exception NamingException if there is no "java:" header or if no
* naming context has been bound to this thread
*/
protected Name parseName(Name name)
throws NamingException {
if ((!initialContext) && (!name.isEmpty())
&& (name.get(0).equals(prefix))) {
return (name.getSuffix(1));
} else {
if (initialContext) {
return (name);
} else {
throw new NamingException
(sm.getString("selectorContext.noJavaUrl"));
}
}
}
}
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