com.mb.framework.util.property.HostnameAwareList.java Source code

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Here is the source code for com.mb.framework.util.property.HostnameAwareList.java

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/**
 * Copyright (C) 2013 Company. All Rights Reserved. 
 * 
 * This software is the proprietary information of Company . 
 * Use is subjected to license terms. 
 *
 * @since Jul 14, 2013 8:44:11 PM
 * @author SPA
    
 *
 */
/**
 * 
 */
package com.mb.framework.util.property;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

import com.mb.framework.util.log.LogHelper;

/**
 * @author SPA
 * 
 */
public class HostnameAwareList {
    private final LogHelper logger = LogHelper.getInstance(HostnameAwareList.class.getName());

    public static final String DEFAULT_KEY = "default";

    private boolean fallbackToDefault;

    private List<String> defaultValueList;

    private String hostname;

    private List<String> valueList;

    /**
     * default constructor
     * 
     * @throws UnknownHostException
     */
    public HostnameAwareList() throws UnknownHostException {
        hostname = InetAddress.getLocalHost().getHostName().toUpperCase();
        logger.debug("Resolved hostname: " + hostname);

        if (StringUtils.isBlank(hostname)) {
            throw new UnknownHostException("Error resolving hostname, hostname is null or empty: " + hostname);
        }
    }

    public void setHostnameValueListMap(Map<String, List<String>> hostnameValueListMap) {
        logger.debug("Current cofigured valueList keys: " + hostnameValueListMap.keySet());

        defaultValueList = hostnameValueListMap.get(DEFAULT_KEY);

        for (String hostnames : hostnameValueListMap.keySet()) {
            valueList = hostnameValueListMap.get(hostnames);
            hostnames = hostnames.toUpperCase().trim();
            if (hostnames.equals(hostname) || hostnames.startsWith(hostname + ",")
                    || hostnames.indexOf("," + hostname + ",") > -1 || hostnames.endsWith("," + hostname)) {
                logger.debug(
                        "Found valueList for hostname: " + hostname + " matching with hostnames key: " + hostnames);
                logger.debug("ValueList for hostname: " + hostname + ", values: " + valueList);
                break;
            } else {
                valueList = null;
            }
        }

        if (valueList == null) {
            logger.warn("Cannot find valueList for hostname: " + hostname + ". Current configured valueList keys: "
                    + hostnameValueListMap.keySet());
        }
    }

    /**
     * @param fallbackToDefault
     *            the fallbackToDefault to set
     */
    public void setFallbackToDefault(boolean fallbackToDefault) {
        this.fallbackToDefault = fallbackToDefault;
        logger.debug("In setFallbackToDefault, fallbackToDefault: " + fallbackToDefault);
    }

    /**
     * This method is used for getting value list
     * 
     * @return
     */
    public List<String> getValueList() {
        if (valueList == null) {
            logger.warn("Cannot find valueList for hostname: " + hostname);
            logger.debug("fallbackToDefault: " + fallbackToDefault);
            if (fallbackToDefault) {
                logger.warn("Trying to falback on default list");
                if (defaultValueList == null) {
                    throw new IllegalArgumentException(
                            "Value list not configured for <hostname> or default: " + hostname);
                } else {
                    logger.debug("DefaultValueList values: " + defaultValueList);
                    return defaultValueList;
                }
            } else {
                throw new IllegalArgumentException("Value list not configured for <hostname>: " + hostname);
            }
        }
        return valueList;
    }

}