|
| 1 | +/* |
| 2 | + * Copyright 2008-present MongoDB, Inc. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package com.mongodb.internal.connection; |
| 18 | + |
| 19 | +import org.bson.BsonArray; |
| 20 | +import org.bson.BsonBinaryReader; |
| 21 | +import org.bson.BsonType; |
| 22 | +import org.bson.BsonValue; |
| 23 | +import org.bson.ByteBuf; |
| 24 | +import org.bson.io.ByteBufferBsonInput; |
| 25 | + |
| 26 | +import java.util.ArrayList; |
| 27 | +import java.util.Collection; |
| 28 | +import java.util.Iterator; |
| 29 | +import java.util.List; |
| 30 | +import java.util.ListIterator; |
| 31 | +import java.util.NoSuchElementException; |
| 32 | +import java.util.Objects; |
| 33 | + |
| 34 | +import static com.mongodb.internal.connection.ByteBufBsonHelper.readBsonValue; |
| 35 | + |
| 36 | +final class ByteBufBsonArray extends BsonArray { |
| 37 | + private final ByteBuf byteBuf; |
| 38 | + |
| 39 | + ByteBufBsonArray(final ByteBuf byteBuf) { |
| 40 | + this.byteBuf = byteBuf; |
| 41 | + } |
| 42 | + |
| 43 | + @Override |
| 44 | + public Iterator<BsonValue> iterator() { |
| 45 | + return new ByteBufBsonArrayIterator(); |
| 46 | + } |
| 47 | + |
| 48 | + @Override |
| 49 | + public List<BsonValue> getValues() { |
| 50 | + List<BsonValue> values = new ArrayList<>(); |
| 51 | + for (BsonValue cur: this) { |
| 52 | + //noinspection UseBulkOperation |
| 53 | + values.add(cur); |
| 54 | + } |
| 55 | + return values; |
| 56 | + } |
| 57 | + |
| 58 | + private static final String READ_ONLY_MESSAGE = "This BsonArray instance is read-only"; |
| 59 | + |
| 60 | + @Override |
| 61 | + public int size() { |
| 62 | + int size = 0; |
| 63 | + for (BsonValue ignored : this) { |
| 64 | + size++; |
| 65 | + } |
| 66 | + return size; |
| 67 | + } |
| 68 | + |
| 69 | + @Override |
| 70 | + public boolean isEmpty() { |
| 71 | + return !iterator().hasNext(); |
| 72 | + } |
| 73 | + |
| 74 | + @Override |
| 75 | + public boolean equals(final Object o) { |
| 76 | + if (o == this) { |
| 77 | + return true; |
| 78 | + } |
| 79 | + if (!(o instanceof List)) { |
| 80 | + return false; |
| 81 | + } |
| 82 | + Iterator<BsonValue> e1 = iterator(); |
| 83 | + Iterator<?> e2 = ((List<?>) o).iterator(); |
| 84 | + while (e1.hasNext() && e2.hasNext()) { |
| 85 | + if (!(Objects.equals(e1.next(), e2.next()))) { |
| 86 | + return false; |
| 87 | + } |
| 88 | + } |
| 89 | + return !(e1.hasNext() || e2.hasNext()); |
| 90 | + } |
| 91 | + |
| 92 | + @Override |
| 93 | + public int hashCode() { |
| 94 | + int hashCode = 1; |
| 95 | + for (BsonValue cur : this) { |
| 96 | + hashCode = 31 * hashCode + (cur == null ? 0 : cur.hashCode()); |
| 97 | + } |
| 98 | + return hashCode; |
| 99 | + } |
| 100 | + |
| 101 | + @Override |
| 102 | + public boolean contains(final Object o) { |
| 103 | + for (BsonValue cur : this) { |
| 104 | + if (Objects.equals(o, cur)) { |
| 105 | + return true; |
| 106 | + } |
| 107 | + } |
| 108 | + |
| 109 | + return false; |
| 110 | + } |
| 111 | + |
| 112 | + @Override |
| 113 | + public Object[] toArray() { |
| 114 | + Object[] retVal = new Object[size()]; |
| 115 | + Iterator<BsonValue> it = iterator(); |
| 116 | + for (int i = 0; i < retVal.length; i++) { |
| 117 | + retVal[i] = it.next(); |
| 118 | + } |
| 119 | + return retVal; |
| 120 | + } |
| 121 | + |
| 122 | + @Override |
| 123 | + @SuppressWarnings("unchecked") |
| 124 | + public <T> T[] toArray(final T[] a) { |
| 125 | + int size = size(); |
| 126 | + T[] retVal = a.length >= size ? a : (T[]) java.lang.reflect.Array.newInstance(a.getClass().getComponentType(), size); |
| 127 | + Iterator<BsonValue> it = iterator(); |
| 128 | + for (int i = 0; i < retVal.length; i++) { |
| 129 | + retVal[i] = (T) it.next(); |
| 130 | + } |
| 131 | + return retVal; |
| 132 | + } |
| 133 | + |
| 134 | + @Override |
| 135 | + public boolean containsAll(final Collection<?> c) { |
| 136 | + for (Object e : c) { |
| 137 | + if (!contains(e)) { |
| 138 | + return false; |
| 139 | + } |
| 140 | + } |
| 141 | + return true; |
| 142 | + } |
| 143 | + |
| 144 | + @Override |
| 145 | + public BsonValue get(final int index) { |
| 146 | + if (index < 0) { |
| 147 | + throw new IndexOutOfBoundsException("Index out of range: " + index); |
| 148 | + } |
| 149 | + |
| 150 | + int i = 0; |
| 151 | + for (BsonValue cur : this) { |
| 152 | + if (i++ == index) { |
| 153 | + return cur; |
| 154 | + } |
| 155 | + } |
| 156 | + |
| 157 | + throw new IndexOutOfBoundsException("Index out of range: " + index); |
| 158 | + } |
| 159 | + |
| 160 | + @Override |
| 161 | + public int indexOf(final Object o) { |
| 162 | + int i = 0; |
| 163 | + for (BsonValue cur : this) { |
| 164 | + if (Objects.equals(o, cur)) { |
| 165 | + return i; |
| 166 | + } |
| 167 | + i++; |
| 168 | + } |
| 169 | + |
| 170 | + return -1; |
| 171 | + } |
| 172 | + |
| 173 | + @Override |
| 174 | + public int lastIndexOf(final Object o) { |
| 175 | + ListIterator<BsonValue> listIterator = listIterator(size()); |
| 176 | + while (listIterator.hasPrevious()) { |
| 177 | + if (Objects.equals(o, listIterator.previous())) { |
| 178 | + return listIterator.nextIndex(); |
| 179 | + } |
| 180 | + } |
| 181 | + return -1; |
| 182 | + } |
| 183 | + |
| 184 | + @Override |
| 185 | + public ListIterator<BsonValue> listIterator() { |
| 186 | + return listIterator(0); |
| 187 | + } |
| 188 | + |
| 189 | + @Override |
| 190 | + public ListIterator<BsonValue> listIterator(final int index) { |
| 191 | + // Not the most efficient way to do this, but unlikely anyone will notice in practice |
| 192 | + return new ArrayList<>(this).listIterator(index); |
| 193 | + } |
| 194 | + |
| 195 | + @Override |
| 196 | + public List<BsonValue> subList(final int fromIndex, final int toIndex) { |
| 197 | + if (fromIndex < 0) { |
| 198 | + throw new IndexOutOfBoundsException("fromIndex = " + fromIndex); |
| 199 | + } |
| 200 | + if (fromIndex > toIndex) { |
| 201 | + throw new IllegalArgumentException("fromIndex(" + fromIndex + ") > toIndex(" + toIndex + ")"); |
| 202 | + } |
| 203 | + List<BsonValue> subList = new ArrayList<>(); |
| 204 | + int i = 0; |
| 205 | + for (BsonValue cur: this) { |
| 206 | + if (i == toIndex) { |
| 207 | + break; |
| 208 | + } |
| 209 | + if (i >= fromIndex) { |
| 210 | + subList.add(cur); |
| 211 | + } |
| 212 | + i++; |
| 213 | + } |
| 214 | + if (toIndex > i) { |
| 215 | + throw new IndexOutOfBoundsException("toIndex = " + toIndex); |
| 216 | + } |
| 217 | + return subList; |
| 218 | + } |
| 219 | + |
| 220 | + @Override |
| 221 | + public boolean add(final BsonValue bsonValue) { |
| 222 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 223 | + } |
| 224 | + |
| 225 | + @Override |
| 226 | + public boolean remove(final Object o) { |
| 227 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 228 | + } |
| 229 | + |
| 230 | + @Override |
| 231 | + public boolean addAll(final Collection<? extends BsonValue> c) { |
| 232 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 233 | + } |
| 234 | + |
| 235 | + @Override |
| 236 | + public boolean addAll(final int index, final Collection<? extends BsonValue> c) { |
| 237 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 238 | + } |
| 239 | + |
| 240 | + @Override |
| 241 | + public boolean removeAll(final Collection<?> c) { |
| 242 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 243 | + } |
| 244 | + |
| 245 | + @Override |
| 246 | + public boolean retainAll(final Collection<?> c) { |
| 247 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 248 | + } |
| 249 | + |
| 250 | + @Override |
| 251 | + public void clear() { |
| 252 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 253 | + } |
| 254 | + |
| 255 | + @Override |
| 256 | + public BsonValue set(final int index, final BsonValue element) { |
| 257 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 258 | + } |
| 259 | + |
| 260 | + @Override |
| 261 | + public void add(final int index, final BsonValue element) { |
| 262 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 263 | + } |
| 264 | + |
| 265 | + @Override |
| 266 | + public BsonValue remove(final int index) { |
| 267 | + throw new UnsupportedOperationException(READ_ONLY_MESSAGE); |
| 268 | + } |
| 269 | + |
| 270 | + private class ByteBufBsonArrayIterator implements Iterator<BsonValue> { |
| 271 | + private final ByteBuf duplicatedByteBuf = byteBuf.duplicate(); |
| 272 | + private final BsonBinaryReader bsonReader; |
| 273 | + |
| 274 | + { |
| 275 | + bsonReader = new BsonBinaryReader(new ByteBufferBsonInput(duplicatedByteBuf)); |
| 276 | + // While one might expect that this would be a call to BsonReader#readStartArray that doesn't work because BsonBinaryReader |
| 277 | + // expects to be positioned at the start at the beginning of a document, not an array. Fortunately, a BSON array has exactly |
| 278 | + // the same structure as a BSON document (the keys are just the array indices converted to a strings). So it works fine to |
| 279 | + // call BsonReader#readStartDocument here, and just skip all the names via BsonReader#skipName below. |
| 280 | + bsonReader.readStartDocument(); |
| 281 | + bsonReader.readBsonType(); |
| 282 | + } |
| 283 | + |
| 284 | + @Override |
| 285 | + public boolean hasNext() { |
| 286 | + return bsonReader.getCurrentBsonType() != BsonType.END_OF_DOCUMENT; |
| 287 | + } |
| 288 | + |
| 289 | + @Override |
| 290 | + public BsonValue next() { |
| 291 | + if (!hasNext()) { |
| 292 | + throw new NoSuchElementException(); |
| 293 | + } |
| 294 | + bsonReader.skipName(); |
| 295 | + BsonValue value = readBsonValue(duplicatedByteBuf, bsonReader); |
| 296 | + bsonReader.readBsonType(); |
| 297 | + return value; |
| 298 | + } |
| 299 | + } |
| 300 | +} |
0 commit comments