content: /*
   * Copyright (c) 2017, Andreas Fagschlunger. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   *   - Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   *
   *   - Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package at.o2xfs.xfs.util;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import at.o2xfs.win32.LPZZSTR;
  import at.o2xfs.win32.Pointer;
  import at.o2xfs.win32.ZSTR;
  
  /**
   * @author Andreas Fagschlunger
   */
  public class KeyValueMap {
  
  	private final static char NUL = '\0';
  
  	public static Map<String, String> from(final LPZZSTR lpzzStr) {
  		final String separator = "=";
  		final Map<String, String> map = new HashMap<String, String>();
  		if (!Pointer.NULL.equals(lpzzStr)) {
  			for (final String s : lpzzStr.get()) {
  				final int beginIndex = s.indexOf(separator);
  				if (beginIndex == -1) {
  					map.put(s, null);
  					continue;
  				}
  				final String key = s.substring(0, beginIndex);
  				final String value = s.substring(beginIndex + separator.length());
  				map.put(key, value);
  			}
  		}
  		return map;
  	}
  
  	public static ZSTR toZZString(final Map<String, String> map) {
  		return toZZString(map, '=');
  	}
  
  	private static ZSTR toZZString(final Map<String, String> map, final char separator) {
  		StringBuilder zzString = new StringBuilder();
  		if (map.isEmpty()) {
  			zzString.append(NUL);
  		} else {
  			for (Map.Entry<String, String> entry : map.entrySet()) {
  				final String key = entry.getKey();
  				final String value = entry.getValue();
  				if (key.indexOf(separator) != -1) {
  					throw new IllegalArgumentException("Key '" + key + "' contains separator " + separator);
  				}
  				zzString.append(key);
  				zzString.append(separator);
  				zzString.append(value);
  				zzString.append(NUL);
  			}
  		}
  		return new ZSTR(zzString.toString());
  	}
  }