Clones a map and prefixes the keys in the clone : Collection « Collections Data Structure « Java

Clones a map and prefixes the keys in the clone

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class Main {

   * Clones a map and prefixes the keys in the clone, e.g.
   * for mapping "JAVA_HOME" to "env.JAVA_HOME" to simulate
   * the behaviour of ANT.
   * @param source the source map
   * @param prefix the prefix used for all names
   * @return the clone of the source map
  public static Map prefix(Map source, String prefix) {

      if(source == null) {
          return null;

      Map result = new HashMap();

      Iterator iter = source.entrySet().iterator();

      while(iter.hasNext()) {
          Map.Entry entry = (Map.Entry);
          Object key = entry.getKey();
          Object value = entry.getValue();
          result.put(prefix + '.' + key.toString(), value);

      return result;



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