| /* |
| * 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.query; |
| |
| import static org.apache.openjpa.persistence.query.PathOperator.NAVIGATION; |
| /** |
| * Represents a path resulted by navigation. |
| * |
| * @author Pinaki Poddar |
| * |
| */ |
| class NavigationPath extends AbstractDomainObject implements PathExpression { |
| protected NavigationPath(QueryDefinitionImpl owner, AbstractPath parent, |
| String attr) { |
| super(owner, parent, NAVIGATION, attr); |
| } |
| |
| @Override |
| public String getLastSegment() { |
| return (String)super.getLastSegment(); |
| } |
| |
| @Override |
| public String getAliasHint(AliasContext ctx) { |
| return getLastSegment(); |
| } |
| |
| @Override |
| public String asProjection(AliasContext ctx) { |
| AbstractPath parent = getParent(); |
| if (ctx.hasAlias(parent)) |
| return ctx.getAlias(parent) + NAVIGATION + getLastSegment(); |
| return getParent().asProjection(ctx) + NAVIGATION + getLastSegment(); |
| } |
| |
| @Override |
| public String asExpression(AliasContext ctx) { |
| return getParent().asExpression(ctx) + NAVIGATION + getLastSegment(); |
| } |
| |
| /** |
| * A navigation path is joinable only when it represents domain of a |
| * subquery. |
| * @see QueryDefinitionImpl#addSubqueryRoot(PathExpression) |
| */ |
| @Override |
| public String asJoinable(AliasContext ctx) { |
| return asProjection(ctx) + SPACE + ctx.getAlias(this); |
| } |
| |
| public String toString() { |
| return getParent().toString()+ NAVIGATION +getLastSegment(); |
| } |
| |
| } |