dummyinitialcontextfactory.java

来自「jsr170接口的java实现。是个apache的开源项目。」· Java 代码 · 共 55 行

/*
 * 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.jackrabbit.core.jndi.provider;

import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.spi.InitialContextFactory;
import java.util.HashMap;
import java.util.Hashtable;

/**
 * <code>DummyInitialContextFactory</code> ...
 */
public class DummyInitialContextFactory implements InitialContextFactory {

    /**
     * map with all the contexts. key=provider-url, value=context
     */
    private static HashMap contexts = new HashMap();

    /**
     * {@inheritDoc}
     */
    public Context getInitialContext(Hashtable environment) throws NamingException {

        String url = (String) environment.get(Context.PROVIDER_URL);
        if (url == null) {
            throw new NamingException("Unable to create context. Environment is missing a " + Context.PROVIDER_URL);
        }

        synchronized (DummyInitialContextFactory.contexts) {
            DummyContext ctx = (DummyContext) contexts.get(url);
            if (ctx == null) {
                ctx = new DummyContext(environment);
                contexts.put(url, ctx);
            }
            return ctx;
        }
    }
}