| /* |
| * 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.ignite.internal.metastorage.common; |
| |
| import java.io.Serializable; |
| import org.apache.ignite.internal.metastorage.common.command.IfInfo; |
| |
| /** |
| * Definition of simple Either-like wrapper to hold one of the statement type: {@link IfInfo} or {@link UpdateInfo}. |
| * Needed to construct and simple deconstruction of nested {@link IfInfo}, |
| * instead of empty interface and instanceof-based unwrap. |
| * |
| * @see IfInfo |
| * @see UpdateInfo |
| */ |
| public class StatementInfo implements Serializable { |
| /** If definition holder. */ |
| private final IfInfo iif; |
| |
| /** Update definition holder. */ |
| private final UpdateInfo update; |
| |
| /** |
| * Constructs new {@link IfInfo} statement definition. |
| * |
| * @param iif If statement definition |
| */ |
| public StatementInfo(IfInfo iif) { |
| this.iif = iif; |
| this.update = null; |
| } |
| |
| /** |
| * Constructs new {@link UpdateInfo} terminal statement definition. |
| * |
| * @param update Update statement definition |
| */ |
| public StatementInfo(UpdateInfo update) { |
| this.update = update; |
| this.iif = null; |
| } |
| |
| /** |
| * Returns true, if statement has no nested statement (i.e. it is {@link UpdateInfo} statement definition). |
| * |
| * @return true, if statement has no nested statement (i.e. it is {@link UpdateInfo} statement definition). |
| */ |
| public boolean isTerminal() { |
| return update != null; |
| } |
| |
| /** |
| * Returns {@link IfInfo} or {@code null}, if iif is not defined. |
| * Note: check which field is filled by {@link #isTerminal()} |
| * |
| * @return {@link IfInfo} or {@code null}, if iif is not defined. |
| */ |
| public IfInfo iif() { |
| return iif; |
| } |
| |
| /** |
| * Returns {@link UpdateInfo} or {@code null}, if update is not defined. |
| * Note: check which field is filled by {@link #isTerminal()} |
| * |
| * @return {@link UpdateInfo} or {@code null}, if update is not defined. |
| */ |
| public UpdateInfo update() { |
| return update; |
| } |
| } |