Registry.java

package mf;

/*Generated by MPS */

import java.util.Dictionary;
import java.util.Hashtable;

public class Registry {
  private static Registry ourSoleInstance = new Registry();
  private Dictionary myEntryPoints = new Hashtable();
  public Registry() {
  }
  private void addObj(String entryPointName, NamedObject newObject) {
    Dictionary theEntryPoint = (Dictionary) myEntryPoints.get(entryPointName);
    if (theEntryPoint == null) {
      theEntryPoint = new Hashtable();
      myEntryPoints.put(entryPointName, theEntryPoint);
    }
    theEntryPoint.put(newObject.name(), newObject);
  }
  private void assertNonNull(Object arg, String message) {
    if (arg == null) {
      throw new NullPointerException(message);
    }
  }
  private NamedObject getObj(String entryPointName, String objectName) {
    Dictionary theEntryPoint = (Dictionary) myEntryPoints.get(entryPointName);
    assertNonNull(theEntryPoint, "No entry point present for " + entryPointName);
    NamedObject answer = (NamedObject) theEntryPoint.get(objectName);
    assertNonNull(answer, "There is no " + entryPointName + " called " + objectName);
    return answer;
  }
  public static void add(String entryPoint, NamedObject newObject) {
    ourSoleInstance.addObj(entryPoint, newObject);
  }
  public static NamedObject get(String entryPointName, String objectName) {
    return ourSoleInstance.getObj(entryPointName, objectName);
  }
}