services/billing-aws/src/main/java/com/epam/dlab/core/BillingUtils.java

/*
 * 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 com.epam.dlab.core;

import java.io.IOException;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.epam.dlab.configuration.BillingToolConfigurationFactory;
import com.epam.dlab.core.parser.ParserBase;
import com.epam.dlab.exceptions.InitializationException;
import com.epam.dlab.logging.AppenderBase;
import com.google.common.io.Resources;

/** Billing toll utilities. 
 */
public class BillingUtils {

	/** Name of resource with the names of module classes. */
	private static final String RESOURCE_MODULE_NAMES = "/" + BillingToolConfigurationFactory.class.getName();

	private BillingUtils() {
	}
	
	/** Create and return map from given key/values.
	 * @param keyValues the key/value pairs.
	 */
	public static Map<String, String> stringsToMap(String ... keyValues) {
		Map<String, String> map = new HashMap<>();
		if (keyValues == null) {
			return map;
		}
		if (keyValues.length % 2 != 0) {
			throw new IllegalArgumentException("Missing key or value in arguments");
		}
		
		for (int i = 1; i < keyValues.length; i+=2) {
			map.put(keyValues[i - 1], keyValues[i]);
		}
		return map;
	}
	
	/** Read and return content as string list from resource.
	 * @param resourceName the name of resource.
	 * @return list of strings.
	 * @throws InitializationException
	 */
	public static List<String> getResourceAsList(String resourceName) throws InitializationException {
        try {
    		URL url = BillingToolConfigurationFactory.class.getResource(resourceName);
            if (url == null) {
            	throw new InitializationException("Resource " + resourceName + " not found");
            }
    		return Resources.readLines(url, Charset.forName("utf-8"));
		} catch (IllegalArgumentException | IOException e) {
			throw new InitializationException("Cannot read resource " + resourceName + ": " + e.getLocalizedMessage(), e);
		}
	}
	
	/** Return the list of billing tool modules.
	 * @throws InitializationException
	 */
	public static List<Class<?>> getModuleClassList() throws InitializationException {
		List<String> modules = getResourceAsList(RESOURCE_MODULE_NAMES);
		List<Class<?>> classes = new ArrayList<>();
		
		for (String className : modules) {
			try {
				classes.add(Class.forName(className));
			} catch (ClassNotFoundException e) {
				throw new InitializationException("Cannot add the sub type " + className +
						" from resource " + RESOURCE_MODULE_NAMES + ": " + e.getLocalizedMessage(), e);
			}
		}
    	return classes;
	}
	
	/** Check for child class is belong to parent by hierarchy.
	 * @param child the child class for check.
	 * @param parent the parent class from hierarchy.
	 */
	public static boolean classChildOf(Class<?> child, Class<?> parent) {
		return child != null && parent != null && parent.isAssignableFrom(child);
	}

	/** Return the type of module if class is module otherwise <b>null</b>.
	 * @param moduleClass the class.
	 */
	public static ModuleType getModuleType(Class<?> moduleClass) {
		if (classChildOf(moduleClass, AdapterBase.class)) {
			return ModuleType.ADAPTER;
		} else if (classChildOf(moduleClass, FilterBase.class)) {
			return ModuleType.FILTER;
		} else if (classChildOf(moduleClass, ParserBase.class)) {
			return ModuleType.PARSER;
		} else if (classChildOf(moduleClass, AppenderBase.class)) {
			return ModuleType.LOGAPPENDER;
		}
		return null;
	}
	
	/** Return the name of user without domain.
	 * @param value the value.
	 */
	public static String getSimpleUserName(String username) {
        return (username == null ? null : username.replaceAll("@.*", ""));
    }
}