Tomcat example source code file (NamingContextBindingsEnumeration.java)

This example Tomcat source code file (NamingContextBindingsEnumeration.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

context, exception, iterator, naming, namingcontextbindingsenumeration, namingcontextbindingsenumeration, namingentry, namingentry, namingenumeration, namingexception, namingexception, object, object, util

The Tomcat NamingContextBindingsEnumeration.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.Iterator;

import javax.naming.Binding;
import javax.naming.CompositeName;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;

/**
 * Naming enumeration implementation.
 *
 * @author Remy Maucherat
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

public class NamingContextBindingsEnumeration 
    implements NamingEnumeration {


    // ----------------------------------------------------------- Constructors


    public NamingContextBindingsEnumeration(Iterator entries, Context ctx) {
    	iterator = entries;
        this.ctx = ctx;
    }

    // -------------------------------------------------------------- Variables


    /**
     * Underlying enumeration.
     */
    protected Iterator iterator;

    
    /**
     * The context for which this enumeration is being generated.
     */
    private Context ctx;


    // --------------------------------------------------------- Public Methods


    /**
     * Retrieves the next element in the enumeration.
     */
    public Object next()
        throws NamingException {
        return nextElementInternal();
    }


    /**
     * Determines whether there are any more elements in the enumeration.
     */
    public boolean hasMore()
        throws NamingException {
        return iterator.hasNext();
    }


    /**
     * Closes this enumeration.
     */
    public void close()
        throws NamingException {
    }


    public boolean hasMoreElements() {
        return iterator.hasNext();
    }


    public Object nextElement() {
        try {
            return nextElementInternal();
        } catch (NamingException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }
    
    private Object nextElementInternal() throws NamingException {
        NamingEntry entry = (NamingEntry) iterator.next();
        
        // If the entry is a reference, resolve it
        if (entry.type == NamingEntry.REFERENCE
                || entry.type == NamingEntry.LINK_REF) {
            try {
                // A lookup will resolve the entry
                ctx.lookup(new CompositeName(entry.name));
            } catch (NamingException e) {
                throw e;
            } catch (Exception e) {
                NamingException ne = new NamingException(e.getMessage());
                ne.initCause(e);
                throw ne;
            }
        }
        
        return new Binding(entry.name, entry.value.getClass().getName(), 
                           entry.value, true);
    }


}