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Core services for Usergrid system.
/*******************************************************************************
* 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;
}