| /* |
| * 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.jdbc.kernel.exps; |
| |
| import org.apache.openjpa.jdbc.sql.SQLBuffer; |
| import org.apache.openjpa.jdbc.sql.Select; |
| import org.apache.openjpa.util.InternalException; |
| |
| /** |
| * Size. |
| * |
| * @author Marc Prud'hommeaux |
| */ |
| class Size |
| extends UnaryOp { |
| |
| public Size(Val val) { |
| super(val); |
| } |
| |
| public ExpState initialize(Select sel, ExpContext ctx, int flags) { |
| // initialize the value with a null test |
| return initializeValue(sel, ctx, NULL_CMP); |
| } |
| |
| public void appendTo(Select sel, ExpContext ctx, ExpState state, |
| SQLBuffer sql, int index) { |
| getValue().calculateValue(sel, ctx, state, null, null); |
| getValue().appendSize(sel, ctx, state, sql); |
| sel.append(sql, state.joins); |
| } |
| |
| protected Class getType(Class c) { |
| return long.class; |
| } |
| |
| protected String getOperator() { |
| // since we override appendTo(), this method should never be called |
| throw new InternalException(); |
| } |
| } |