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package org.jvnet.jaxbcommons.lang.util;

import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

import org.jvnet.jaxbcommons.lang.EqualsAware;
import org.jvnet.jaxbcommons.lang.HashCodeAware;
import org.jvnet.jaxbcommons.lang.VisitedObjects;

public class HashCodeUtils {

  private HashCodeUtils() {

  }

  public static int hashCode(Object object, VisitedObjects visitedObjects) {
    if (object == null) {
      return 0;
    }
    else {
      if (object instanceof HashCodeAware) {
        return ((HashCodeAware) object).visitHashCode(visitedObjects);
      }
      else if (object instanceof List) {

        int hashCode = 1;
        final Iterator i = ((List) object).iterator();
        while (i.hasNext()) {
          Object obj = i.next();
          hashCode = 31
              * hashCode
              + (obj == null ? 0 : ((obj instanceof HashCodeAware) ? ((HashCodeAware) obj)
                  .visitHashCode(visitedObjects) : obj.hashCode()));
        }
        return hashCode;
      }
      else {
        return object.hashCode();
      }
    }
  }
}