| /* |
| * 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.binary; |
| |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Reader handles. |
| */ |
| public class BinaryReaderHandles { |
| /** Mode: empty. */ |
| private static final int MODE_EMPTY = 0; |
| |
| /** Mode: single object. */ |
| private static final int MODE_SINGLE = 1; |
| |
| /** Mode: multiple objects. */ |
| private static final int MODE_MULTIPLE = 2; |
| |
| /** Position. */ |
| private int singlePos; |
| |
| /** Data. This is either an object or a map. */ |
| private Object data; |
| |
| /** Mode. */ |
| private int mode = MODE_EMPTY; |
| |
| /** |
| * Get object by position. |
| * |
| * @param pos Position. |
| * @return Object. |
| */ |
| @SuppressWarnings("unchecked") |
| public @Nullable <T> T get(int pos) { |
| switch (mode) { |
| case MODE_EMPTY: |
| return null; |
| |
| case MODE_SINGLE: |
| return pos == singlePos ? (T)data : null; |
| |
| default: |
| assert mode == MODE_MULTIPLE; |
| |
| return (T)((Map<Integer, Object>)data).get(pos); |
| } |
| } |
| |
| /** |
| * Put object to registry and return previous position (if any). |
| * |
| * @param pos Position. |
| * @param obj Object. |
| */ |
| @SuppressWarnings("unchecked") |
| public void put(int pos, Object obj) { |
| assert pos >= 0; |
| assert obj != null; |
| |
| switch (mode) { |
| case MODE_EMPTY: |
| this.singlePos = pos; |
| this.data = obj; |
| this.mode = MODE_SINGLE; |
| |
| break; |
| |
| case MODE_SINGLE: |
| Map<Integer, Object> newData = new HashMap(3, 1.0f); |
| |
| newData.put(singlePos, data); |
| newData.put(pos, obj); |
| |
| this.singlePos = -1; |
| this.data = newData; |
| this.mode = MODE_MULTIPLE; |
| |
| break; |
| |
| default: |
| assert mode == MODE_MULTIPLE; |
| |
| Map<Integer, Object> data0 = (Map<Integer, Object>)data; |
| |
| data0.put(pos, obj); |
| } |
| } |
| } |