memorynamingcontext.java

Tomcat 4.1与WebServer集成组件的源代码包.

    }
    
    /**
     * 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 {
        // Removing empty parts
        while ((!name.isEmpty()) && (name.get(0).length() == 0))
            name = name.getSuffix(1);
        
        if (name.isEmpty()) {
            return new NamingContextEnumeration(bindings.elements(), this, true);
        }
        
        NamingEntry entry = (NamingEntry) bindings.get(name.get(0));
        
        if (entry == null) {
            throw new NameNotFoundException
                (sm.getString("namingContext.nameNotBound", name.get(0)));
        }
        
        if (entry.type != NamingEntry.CONTEXT) {
            throw new NamingException
                (sm.getString("namingContext.contextExpected"));
        }
        return ((Context) entry.value).listBindings(name.getSuffix(1));
    }

    /**
     * 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 DirContext createSubcontext(Name name, Attributes attrs)
        throws NamingException
    {
        checkWritable(name);
        
        DirContext newContext = new MemoryNamingContext(env);
        bind(name, newContext);
        return newContext;
    }

    // XXX Make it iterative, less objects
    private NamingEntry findNamingEntry(Name name, boolean resolveLinks)
        throws NamingException
    {
         if (name.isEmpty()) {
//             // If name is empty, a newly allocated naming context is returned
//             MemoryNamingContext mmc= new MemoryNamingContext(env);
//             mmc.setBindings( bindings );
//             return mmc;
             return null;
         }
        
        NamingEntry entry = (NamingEntry) bindings.get(name.get(0));
        
        if (entry == null) {
            throw new NameNotFoundException
                (sm.getString("namingContext.nameNotBound", name.get(0)));
        }
        
        if (name.size() > 1) {
            // If the size of the name is greater that 1, then we go through a
            // number of subcontexts.
            if (entry.type != NamingEntry.CONTEXT) {
                throw new NamingException
                    (sm.getString("namingContext.contextExpected"));
            }
            return entry;
        } else {
            return entry;
        }
    }

    public Object lookup(Name name, boolean resolveLinks)
        throws NamingException
    {
        // Removing empty parts
        while ((!name.isEmpty()) && (name.get(0).length() == 0))
            name = name.getSuffix(1);
        
        NamingEntry entry=findNamingEntry( name, resolveLinks );

        if( entry.type == NamingEntry.CONTEXT ) {
            return ((BaseDirContext) entry.value).lookup(name.getSuffix(1), resolveLinks);
        }
        
        if ((resolveLinks) && (entry.type == NamingEntry.LINK_REF)) {
            String link = ((LinkRef) entry.value).getLinkName();
            if (link.startsWith(".")) {
                // Link relative to this context
                return lookup(link.substring(1));
            } else {
                return (new InitialContext(env)).lookup(link);
            }
        } else if (entry.type == NamingEntry.REFERENCE) {
            try {
                Object obj = NamingManager.getObjectInstance
                    (entry.value, name, this, env);
                if (obj != null) {
                    entry.value = obj;
                    entry.type = NamingEntry.ENTRY;
                }
                return obj;
            } catch (NamingException e) {
                throw e;
            } catch (Exception e) {
                throw new NamingException(e.getMessage());
            }
        } else {
            return entry.value;
        }
    }

    /**
     * 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 object the object to bind; possibly null
     * @param rebind if true, then perform a rebind (ie, overwrite)
     * @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, Attributes attrs,
                     boolean rebind)
        throws NamingException
    {
        checkWritable(name);
        
	while ((!name.isEmpty()) && (name.get(0).length() == 0))
	    name = name.getSuffix(1);

        if (name.isEmpty())
            throw new NamingException
                (sm.getString("namingContext.invalidName"));
        
        NamingEntry entry = (NamingEntry) bindings.get(name.get(0));
        
        if (name.size() > 1) {
            if (entry == null) {
                throw new NameNotFoundException
                    (sm.getString("namingContext.nameNotBound", name.get(0)));
            }
            if (entry.type == NamingEntry.CONTEXT) {
                if (rebind) {
                    ((Context) entry.value).rebind(name.getSuffix(1), obj);
                } else {
                    ((Context) entry.value).bind(name.getSuffix(1), obj);
                }
            } else {
                throw new NamingException
                    (sm.getString("namingContext.contextExpected"));
            }
        } else {
            if ((!rebind) && (entry != null)) {
                throw new NamingException
                    (sm.getString("namingContext.alreadyBound", name.get(0)));
            } else {
                // Getting the type of the object and wrapping it within a new
                // NamingEntry
                Object toBind = 
                    NamingManager.getStateToBind(obj, name, this, env);
                if (toBind instanceof Context) {
                    entry = new NamingEntry(name.get(0), toBind, attrs,  
                                            NamingEntry.CONTEXT);
                } else if (toBind instanceof LinkRef) {
                    entry = new NamingEntry(name.get(0), toBind, attrs, 
                                            NamingEntry.LINK_REF);
                } else if (toBind instanceof Reference) {
                    entry = new NamingEntry(name.get(0), toBind, attrs, 
                                            NamingEntry.REFERENCE);
                } else if (toBind instanceof Referenceable) {
                    toBind = ((Referenceable) toBind).getReference();
                    entry = new NamingEntry(name.get(0), toBind, attrs, 
                                            NamingEntry.REFERENCE);
                } else {
                    entry = new NamingEntry(name.get(0), toBind, attrs, 
                                            NamingEntry.ENTRY);
                }
                bindings.put(name.get(0), entry);
            }
        }
    }
}