| /* |
| * 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); |
| } |