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Core services for Usergrid system.

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/*******************************************************************************
 * Copyright 2012 Apigee Corporation
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package org.usergrid.persistence.query.tree;

import org.antlr.runtime.tree.CommonTree;

import org.antlr.runtime.Token;
import org.usergrid.persistence.exceptions.PersistenceException;

/**
 * Any logical operation should subclass.  Boolean logic, equality, not, contains, within and others are examples of operands
 * 
 * @author tnine
 *
 */
public abstract class Operand extends CommonTree{

  
  /**
   * Default constructor to take a token
   * @param t
   */
  public Operand(Token t){
    super(t);
  }
  
  /**
   * Get the pointer to the parent node
   */
  public Operand getParent(){
      return (Operand) super.getParent();
  }
  
  /**
   * Visitor method
   * @param visitor
 * @throws PersistenceException 
   */
  public abstract void visit(QueryVisitor visitor) throws PersistenceException;
  
  
}