How to use org.apache.jackrabbit.spi.commons.query

public Object visit(QueryRootNode node, Object data) throws RepositoryException {
  PathQueryNode pathNode = node.getLocationNode();
  if (pathNode != null) {
    pathNode.accept(this, data);
  }
  OrderQueryNode orderNode = node.getOrderNode();
  if (orderNode != null) {
    orderNode.accept(this, data);
  }
  return data;
}

/**
 * {@inheritDoc}
 */
public boolean needsSystemTree() {
  return (locationNode != null && locationNode.needsSystemTree()) || (orderNode != null && orderNode.needsSystemTree());
}

public Object visit(ASTNotExpression node, Object data) {
  NAryQueryNode parent = (NAryQueryNode) data;
  NotQueryNode notQuery = factory.createNotQueryNode(parent);
  // pass to operand
  node.childrenAccept(this, notQuery);
  if (notQuery.getNumOperands() > 0) {
    parent.addOperand(notQuery);
  }
  return parent;
}

public Object visit(ASTOrExpression node, Object data) {
  NAryQueryNode parent = (NAryQueryNode) data;
  OrQueryNode orQuery = factory.createOrQueryNode(parent);
  // pass to operands
  node.childrenAccept(this, orQuery);
  if (orQuery.getNumOperands() > 0) {
    parent.addOperand(orQuery);
  }
  return parent;
}

/**
 * {@inheritDoc}
 * @throws RepositoryException
 */
public Object accept(QueryNodeVisitor visitor, Object data) throws RepositoryException {
  return visitor.visit(this, data);
}

/**
 * {@inheritDoc}
 */
public PathQueryNode createPathQueryNode(QueryNode parent) {
  return new PathQueryNode(parent, validJcrSystemNodeTypeNames);
}

  /**
   * {@inheritDoc}
   */
  public boolean equals(Object obj) {
    if (obj instanceof NodeTypeQueryNode) {
      return super.equals(obj);
    }
    return false;
  }
}

/**
 * Adds a path step to this <code>PathQueryNode</code>.
 *
 * @param step the step to add.
 */
public void addPathStep(LocationStepQueryNode step) {
  addOperand(step);
}

/**
 * {@inheritDoc}
 */
public NodeTypeQueryNode createNodeTypeQueryNode(QueryNode parent,
                         Name nodeType) {
  return new NodeTypeQueryNode(parent, nodeType);
}

/**
 * {@inheritDoc}
 */
public RelationQueryNode createRelationQueryNode(QueryNode parent,
                         int operation) {
  return new RelationQueryNode(parent, operation, this);
}

/**
 * {@inheritDoc}
 */
public OrderQueryNode createOrderQueryNode(QueryNode parent) {
  return new OrderQueryNode(parent);
}

/**
 * {@inheritDoc}
 */
public OrQueryNode createOrQueryNode(QueryNode parent) {
  return new OrQueryNode(parent);
}

/**
 * {@inheritDoc}
 */
public QueryRootNode createQueryRootNode() {
  return new QueryRootNode();
}

/**
 * Dumps the node tree to buffer.
 * @param node the root node.
 * @param buffer where to dump the tree.
 * @throws RepositoryException
 */
private QueryTreeDump(QueryNode node, StringBuffer buffer) throws RepositoryException {
  node.accept(this, buffer);
}

public Object visit(QueryRootNode node, Object data) throws RepositoryException {
  PathQueryNode pathNode = node.getLocationNode();
  if (pathNode != null) {
    pathNode.accept(this, data);
  }
  OrderQueryNode orderNode = node.getOrderNode();
  if (orderNode != null) {
    orderNode.accept(this, data);
  }
  return data;
}

/**
 * {@inheritDoc}
 */
public boolean needsSystemTree() {
  return (locationNode != null && locationNode.needsSystemTree()) || (orderNode != null && orderNode.needsSystemTree());
}

/**
 * {@inheritDoc}
 * @throws RepositoryException
 */
public Object accept(QueryNodeVisitor visitor, Object data) throws RepositoryException {
  return visitor.visit(this, data);
}

/**
 * {@inheritDoc}
 */
public PathQueryNode createPathQueryNode(QueryNode parent) {
  return new PathQueryNode(parent, validJcrSystemNodeTypeNames);
}

/**
 * {@inheritDoc}
 * @throws RepositoryException
 */
public Object accept(QueryNodeVisitor visitor, Object data) throws RepositoryException {
  return visitor.visit(this, data);
}

/**
 * {@inheritDoc}
 * @throws RepositoryException
 */
public Object accept(QueryNodeVisitor visitor, Object data) throws RepositoryException {
  return visitor.visit(this, data);
}