/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.openjpa.persistence.criteria;
/**
* Interface to support Visitor pattern and CQL conversion of Criteria Query nodes.
*
* @author Pinaki Poddar
* @since 2.0.0
*/
interface CriteriaExpression {
/**
* Accept visit from the given visitor. The receiver is responsible
* to propagate the visitor to the constituent sub-nodes if any.
*
* @param visitor a processor to walk the nodes of a tree.
*/
void acceptVisit(CriteriaExpressionVisitor visitor);
/**
* Get a string representation of this node as a value in the context of the given query.
*/
StringBuilder asValue(AliasContext q);
/**
* Get a string representation of this node as a variable in the context of the given query.
*/
StringBuilder asVariable(AliasContext q);
/**
* Get a string representation of this node as a projection term in the context of the given query.
*/
StringBuilder asProjection(AliasContext q);
}