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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.spring;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.FactoryBean;

/**
 * A helper class for creating a failover configured {@link ActiveMQConnectionFactory}
 * which supports one or more TCP based hostname/ports which can all be configured in a
 * consistent way without too much URL hacking.
 *
 * 
 */
public class ActiveMQConnectionFactoryFactoryBean implements FactoryBean {
    private List tcpHostAndPorts = new ArrayList();

    // tcp properties
    private Long maxInactivityDuration;
    private String tcpProperties;

    // failover properties
    private Long maxReconnectDelay;
    private String failoverProperties;

    public Object getObject() throws Exception {
        ActiveMQConnectionFactory answer = new ActiveMQConnectionFactory();
        String brokerURL = getBrokerURL();
        answer.setBrokerURL(brokerURL);
        return answer;
    }

    public String getBrokerURL() {
        StringBuffer buffer = new StringBuffer("failover:(");
        int counter = 0;
        for (String tcpHostAndPort : tcpHostAndPorts) {
            if (counter++ > 0) {
                buffer.append(",");
            }
            buffer.append(createTcpHostAndPortUrl(tcpHostAndPort));
        }
        buffer.append(")");

        List parameters = new ArrayList();
        if (maxReconnectDelay != null) {
            parameters.add("maxReconnectDelay=" + maxReconnectDelay);
        }
        if (notEmpty(failoverProperties)) {
            parameters.add(failoverProperties);
        }
        buffer.append(asQueryString(parameters));
        return buffer.toString();
    }

    public Class getObjectType() {
        return ActiveMQConnectionFactory.class;
    }

    public boolean isSingleton() {
        return true;
    }

    // Properties
    //-------------------------------------------------------------------------

    public List getTcpHostAndPorts() {
        return tcpHostAndPorts;
    }

    public void setTcpHostAndPorts(List tcpHostAndPorts) {
        this.tcpHostAndPorts = tcpHostAndPorts;
    }

    public void setTcpHostAndPort(String tcpHostAndPort) {
        tcpHostAndPorts = new ArrayList();
        tcpHostAndPorts.add(tcpHostAndPort);
    }

    public Long getMaxInactivityDuration() {
        return maxInactivityDuration;
    }

    public void setMaxInactivityDuration(Long maxInactivityDuration) {
        this.maxInactivityDuration = maxInactivityDuration;
    }

    public String getTcpProperties() {
        return tcpProperties;
    }

    public void setTcpProperties(String tcpProperties) {
        this.tcpProperties = tcpProperties;
    }

    public Long getMaxReconnectDelay() {
        return maxReconnectDelay;
    }

    public void setMaxReconnectDelay(Long maxReconnectDelay) {
        this.maxReconnectDelay = maxReconnectDelay;
    }

    public String getFailoverProperties() {
        return failoverProperties;
    }

    public void setFailoverProperties(String failoverProperties) {
        this.failoverProperties = failoverProperties;
    }

    // Implementation methods
    //-------------------------------------------------------------------------

    /**
     * Turns a list of query string key=value strings into a query URL string
     * of the form "?a=x&b=y"
     */
    protected String asQueryString(List parameters) {
        int size = parameters.size();
        if (size < 1) {
            return "";
        }
        else {
            StringBuffer buffer = new StringBuffer("?");
            buffer.append(parameters.get(0));
            for (int i = 1; i < size; i++) {
                buffer.append("&");
                buffer.append(parameters.get(i));
            }
            return buffer.toString();
        }
    }

    /**
     * Allows us to add any TCP specific URI configurations
     */
    protected String createTcpHostAndPortUrl(String tcpHostAndPort) {
        List parameters = new ArrayList();
        if (maxInactivityDuration != null) {
            parameters.add("wireFormat.maxInactivityDuration=" + maxInactivityDuration);
        }
        if (notEmpty(tcpProperties)) {
            parameters.add(tcpProperties);
        }
        return tcpHostAndPort + asQueryString(parameters);
    }


    protected boolean notEmpty(String text) {
        return text != null && text.length() > 0;
    }

}