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package org.jvnet.jaxbcommons.lang.util;

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

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

public class EqualsUtils {

  private EqualsUtils() {

  }

  public static boolean equals(Object left, Object right, VisitedObjects visitedObjects) {
    if (left == right) {
      return true;
    }
    else if (left == null) {
      return right == null;
    }
    else {
      if (left instanceof EqualsAware) {
        return ((EqualsAware) left).visitEquals(right, visitedObjects);
      }
      else if (left instanceof List) {
        if (!(right instanceof List)) {
          return false;
        }
        else {
          final ListIterator e1 = ((List) left).listIterator();
          final ListIterator e2 = ((List) right).listIterator();
          while (e1.hasNext() && e2.hasNext()) {
            final Object o1 = e1.next();
            final Object o2 = e2.next();

            if (!(o1 == null ? o2 == null :

            (o1 instanceof EqualsAware ? ((EqualsAware) o1).visitEquals(o2, visitedObjects) : o1
                .equals(o2))))
              return false;
          }
          return !(e1.hasNext() || e2.hasNext());
        }
      }
      else {
        return left.equals(right);
      }
    }
  }
}