org.lwapp.commons.utils.MapUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of lwapp-commons Show documentation

Lwapp commons is a utility jar file with most common features needed in daily java programming.

The newest version!

package org.lwapp.commons.utils;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

public class MapUtil {
	private static final String DELIMITER = ";";

	public static String mapToString(final Map map) {
		if (map == null) {
			return StringUtils.EMPTY;
		}

		final StringBuilder stringBuilder = new StringBuilder();
		for (final String key : map.keySet()) {
			if (stringBuilder.length() > 0) {
				stringBuilder.append(DELIMITER);
			}
			final String value = map.get(key);
			try {
				stringBuilder.append(key != null ? URLEncoder.encode(key, "UTF-8") : "");
				stringBuilder.append("=");
				stringBuilder.append(value != null ? URLEncoder.encode(value, "UTF-8") : "");
			} catch (final UnsupportedEncodingException e) {
				throw new RuntimeException("This method requires UTF-8 encoding support", e);
			}
		}

		return stringBuilder.toString();
	}

	public static Map stringToMap(final String input) {
		if (StringUtils.isBlank(input)) {
			return Collections.emptyMap();
		}
		final Map map = new HashMap();

		final String[] nameValuePairs = input.split(DELIMITER);
		for (final String nameValuePair : nameValuePairs) {
			final String[] nameValue = nameValuePair.split("=");
			try {
				map.put(URLDecoder.decode(nameValue[0], "UTF-8"), nameValue.length > 1 ? URLDecoder.decode(nameValue[1], "UTF-8") : "");
			} catch (final UnsupportedEncodingException e) {
				throw new RuntimeException("This method requires UTF-8 encoding support", e);
			}
		}

		return map;
	}
}