content: /**
   * Portions Copyright 2006 DFKI GmbH.
   * Portions Copyright 2001 Sun Microsystems, Inc.
   * Portions Copyright 1999-2001 Language Technologies Institute,
   * Carnegie Mellon University.
   * All Rights Reserved.  Use is subject to license terms.
   * <p/>
   * Permission is hereby granted, free of charge, to use and distribute
   * this software and its documentation without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sublicense, and/or sell copies of this work, and to
   * permit persons to whom this work is furnished to do so, subject to
   * the following conditions:
   * <p/>
   * 1. The code must retain the above copyright notice, this list of
   * conditions and the following disclaimer.
   * 2. Any modifications must be clearly marked as such.
   * 3. Original authors' names are not deleted.
   * 4. The authors' names are not used to endorse or promote products
   * derived from this software without specific prior written
   * permission.
   * <p/>
   * DFKI GMBH AND THE CONTRIBUTORS TO THIS WORK DISCLAIM ALL WARRANTIES WITH
   * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DFKI GMBH NOR THE
   * CONTRIBUTORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
   * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
   * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
   * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
   * THIS SOFTWARE.
   */
  
  package marytts.unitselection.weightingfunctions;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * This class connects weighting function names with the actual
   * instances of the weighting functions.
   *
   * @author sacha
   */
  public class WeightFunctionManager {
  
      public static Map weightFuncMap;
  
      static {
          weightFuncMap = new HashMap();
          weightFuncMap.put("linear", new WeightingFunction.linear());
          weightFuncMap.put("step", new WeightingFunction.step());
      }
  
      /**
       * Dummy empty contructor.
       */
      public WeightFunctionManager() {
      }
  
  
      /**
       * Accessor for the hash map mapping names to interface instances.
       *
       * @return a hash map.
       */
      public static Map getWeightFunc() {
          return weightFuncMap;
      }
  
      /**
       * Returns the weighting function from its name.
       *
       * @param funcName The name of the weighting function.
       * @return an interface to a weighting function.
       */
      public WeightFunc getWeightFunction(String funcName) {
          /* Split the string in 2 parts: function name plus parameters */
          String[] strPart = funcName.split("\\s", 2);
          WeightFunc wf = (WeightFunc) weightFuncMap.get(strPart[0]);
          /* If the function asked for does not exist, inform the user and throw an exception. */
          if (wf == null) {
              String[] known = (String[]) weightFuncMap.keySet().toArray(new String[0]);
              String strKnown = known[0];
              for (int i = 1; i < known.length; i++) {
                  strKnown = strKnown + "; " + known[i];
              }
              strKnown = strKnown + ".";
              throw new RuntimeException("The weighting manager was asked for the unknown weighting function type ["
                      + funcName + "]. Known types are: " + strKnown);
          }
          /* If the function has a parameter, parse and set it */
          // TODO: This is not thread-safe! What if several threads call wf.setParam() with different values?
          if (strPart.length > 1) wf.setParam(strPart[1]);
          /* Return the functionś interface */
          return (wf);
      }
  
  }
  