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Extended implementation of Spring Boot Data JPA Starter
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/*
 * Copyright 2016 the original author or authors.
 *
 * Licensed 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.springframework.boot.autoconfigure.jdbc.plus;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * JDBC URL
 */
public abstract class JdbcUrl { // @checkstyle:ok
	
	/**
	 * Constructor
	 * 
	 * @param url URL
	 * @throws IllegalArgumentException if failed to parse URL
	 */
	public JdbcUrl(String url) throws IllegalArgumentException {
		
		// check format
		Matcher matcher = Pattern.compile(this.getUrlPattern()).matcher(url);
		
		if (!matcher.matches() || matcher.groupCount() != 2) {
			
			throw new IllegalArgumentException("Failed to parse URL: " + url);
		}
		
		// extract parameters
		Map params = new LinkedHashMap<>();
		
		for (String query : matcher.group(2).trim().replaceAll("^" + Pattern.quote(this.getQueryStarter()), "")
			.split(Pattern.quote(this.getQueryJoiner()))) {
			
			query = query.trim();
			
			if (query.isEmpty()) {
				
				continue;
			}
			
			String[] pieces = query.split(Pattern.quote(this.getParamJoiner()));
			
			if (pieces.length != 2) {
				
				continue;
			}
			
			params.put(pieces[0].trim(), pieces[1].trim());
		}
		
		this.path = matcher.group(1);
		this.params = params;
	}
	
	/**
	 * Path
	 */
	private String path;
	
	/**
	 * Parameters
	 */
	private Map params = new LinkedHashMap<>();
	
	/**
	 * Add parameter
	 * 
	 * @param key key
	 * @param value value
	 */
	protected void addParam(String key, Object value) {
		
		this.params.put(key, value);
	}
	
	/**
	 * Get URL pattern
	 * 
	 * @return URL pattern
	 */
	protected abstract String getUrlPattern();
	
	/**
	 * Get prefix
	 * 
	 * @return prefix
	 */
	protected abstract String getPrefix();
	
	/**
	 * Get query starter
	 * 
	 * @return query starter
	 */
	protected abstract String getQueryStarter();
	
	/**
	 * Get query joiner
	 * 
	 * @return query joiner
	 */
	protected abstract String getQueryJoiner();
	
	/**
	 * Get parameter joiner
	 * 
	 * @return parameter joiner
	 */
	protected abstract String getParamJoiner();
	
	/**
	 * Build URL
	 * 
	 * @return URL
	 */
	@Override
	public String toString() {
		
		List queries = new ArrayList<>();
		
		for (Entry entry : this.params.entrySet()) {
			
			StringBuilder query = new StringBuilder();
			query.append(entry.getKey());
			query.append(this.getParamJoiner());
			query.append(this.convertParamValue(entry.getValue()));
			
			queries.add(query.toString());
		}
		
		StringBuilder url = new StringBuilder();
		url.append(this.getPrefix());
		url.append(this.path);
		
		if (!queries.isEmpty()) {
			
			url.append(this.getQueryStarter());
			url.append(String.join(this.getQueryJoiner(), queries));
		}
		
		return url.toString();
	}
	
	/**
	 * Convert parameter value
	 * 
	 * @param value value
	 * @return converted value
	 */
	protected String convertParamValue(Object value) {
		
		return String.valueOf(value);
	}
}