| /* |
| * 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; |
| |
| import javax.persistence.criteria.Expression; |
| import javax.persistence.criteria.Order; |
| |
| /** |
| * Ordering clause of a criteria query. |
| * |
| * @author Pinaki Poddar |
| * |
| */ |
| class OrderImpl implements Order, CriteriaExpression { |
| private boolean _ascending; |
| private final ExpressionImpl<?> e; |
| |
| public OrderImpl(Expression<?> e, boolean asc) { |
| this.e = (ExpressionImpl<?>) e; |
| _ascending = asc; |
| } |
| |
| public OrderImpl(Expression<?> e) { |
| this(e, true); |
| } |
| |
| @Override |
| public ExpressionImpl<?> getExpression() { |
| return e; |
| } |
| |
| @Override |
| public boolean isAscending() { |
| return _ascending; |
| } |
| |
| @Override |
| public Order reverse() { |
| _ascending = !_ascending; |
| return this; |
| } |
| |
| @Override |
| public void acceptVisit(CriteriaExpressionVisitor visitor) { |
| if (!visitor.isVisited(this)) { |
| visitor.enter(this); |
| visitor.exit(this); |
| } |
| } |
| |
| @Override |
| public StringBuilder asValue(AliasContext q) { |
| return (e.isAutoAliased() ? e.asValue(q) : new StringBuilder(e.getAlias())) |
| .append(_ascending ? "" : " DESC"); |
| } |
| |
| @Override |
| public StringBuilder asProjection(AliasContext q) { |
| throw new IllegalStateException(this + " can not be rendered as projection"); |
| } |
| |
| @Override |
| public StringBuilder asVariable(AliasContext q) { |
| throw new IllegalStateException(this + " can not be rendered as variable"); |
| } |
| } |