cda/plugins/org.eclipse.mdht.cda.xml.ui/src/org/eclipse/mdht/cda/xml/FooBar.java

/*******************************************************************************
 * Copyright (c) 2020 seanmuir.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     seanmuir - initial API and implementation
 *
 *******************************************************************************/
package org.eclipse.mdht.cda.xml;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @author seanmuir
 *
 */
public class FooBar {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// fail("Not yet implemented");

		ArrayList<String> aaaa = new ArrayList<String>();
		// aaaa.add("aaaa");
		// aaaa.add("bbbb");
		// aaaa.add("cccc");
		//
		// String foo2 = convertWithStream(aaaa);
		// System.out.println(foo2);

		Map<String, List<String>> wordsByKey = new HashMap<String, List<String>>();
		wordsByKey.put("1", new ArrayList<String>());
		wordsByKey.put("2", new ArrayList<String>());
		wordsByKey.put("3", new ArrayList<String>());
		wordsByKey.put("4", new ArrayList<String>());

		wordsByKey.get("1").add("aaaaaaa");
		wordsByKey.get("2").add("aaaaaaa");
		wordsByKey.get("3").add("aaaaaaa");
		wordsByKey.get("4").add("aaaaaaa");

		wordsByKey.get("1").add("bbb");
		wordsByKey.get("2").add("bbb");
		wordsByKey.get("3").add("bb");
		wordsByKey.get("4").add("bbb");

		String foo = convertWithStream(wordsByKey);
		System.out.println(foo);

		Map<String, List<String>> t = convertWithStream(foo);

		for (String k : t.keySet()) {
			System.out.println(k + "  >> " + t.get(k));
		}

	}

	public static String convertWithStream(List<String> list) {
		String mapAsString = " " + String.join(" ", list) + " ";
		return mapAsString;
	}

	public static String convertWithStream(Map<String, List<String>> map) {
		String mapAsString = map.keySet().stream().map(key -> key + "=" + convertWithStream(map.get(key))).collect(
			Collectors.joining(", ", " ", " "));
		return mapAsString;
	}

	public static Map<String, List<String>> convertWithStream(String mapAsString) {
		Map<String, String> map1 = Arrays.stream(mapAsString.split(",")).map(entry -> entry.split("=")).collect(
			Collectors.toMap(entry -> entry[0], entry -> entry[1]));

		Map<String, List<String>> map2 = new HashMap<String, List<String>>();
		for (String k : map1.keySet()) {
			map2.put(k, new ArrayList<String>());
			map2.get(k).addAll(Arrays.asList(map1.get(k).split(" ")));
		}

		return map2;
	}

}