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Puts together an ActiveMQ OSGi bundle

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/**
 * 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.activemq.security;

import java.security.Principal;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.apache.activemq.command.ActiveMQDestination;

/**
 * Used to cache up authorizations so that subsequent requests are faster.
 *
 *
 */
public abstract class SecurityContext {

    public static final SecurityContext BROKER_SECURITY_CONTEXT = new SecurityContext("ActiveMQBroker") {
        @Override
        public boolean isBrokerContext() {
            return true;
        }

        @Override
        public Set getPrincipals() {
            return Collections.emptySet();
        }
    };

    final String userName;

    final ConcurrentMap authorizedWriteDests = new ConcurrentHashMap();

    public SecurityContext(String userName) {
        this.userName = userName;
    }

    public boolean isInOneOf(Set allowedPrincipals) {
        Iterator allowedIter = allowedPrincipals.iterator();
        HashSet userPrincipals = new HashSet