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The Java operations layer for the MongoDB Java Driver.
Third parties can wrap this layer to provide custom higher-level APIs
/*
* Copyright 2008-present MongoDB, Inc.
*
* Licensed 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 com.mongodb.internal.connection;
import org.bson.BsonArray;
import org.bson.BsonBinaryReader;
import org.bson.BsonType;
import org.bson.BsonValue;
import org.bson.ByteBuf;
import org.bson.io.ByteBufferBsonInput;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import java.util.Objects;
import static com.mongodb.internal.connection.ByteBufBsonHelper.readBsonValue;
final class ByteBufBsonArray extends BsonArray {
private final ByteBuf byteBuf;
ByteBufBsonArray(final ByteBuf byteBuf) {
this.byteBuf = byteBuf;
}
@Override
public Iterator iterator() {
return new ByteBufBsonArrayIterator();
}
@Override
public List getValues() {
List values = new ArrayList<>();
for (BsonValue cur: this) {
//noinspection UseBulkOperation
values.add(cur);
}
return values;
}
private static final String READ_ONLY_MESSAGE = "This BsonArray instance is read-only";
@Override
public int size() {
int size = 0;
for (BsonValue ignored : this) {
size++;
}
return size;
}
@Override
public boolean isEmpty() {
return !iterator().hasNext();
}
@Override
public boolean equals(final Object o) {
if (o == this) {
return true;
}
if (!(o instanceof List)) {
return false;
}
Iterator e1 = iterator();
Iterator e2 = ((List) o).iterator();
while (e1.hasNext() && e2.hasNext()) {
if (!(Objects.equals(e1.next(), e2.next()))) {
return false;
}
}
return !(e1.hasNext() || e2.hasNext());
}
@Override
public int hashCode() {
int hashCode = 1;
for (BsonValue cur : this) {
hashCode = 31 * hashCode + (cur == null ? 0 : cur.hashCode());
}
return hashCode;
}
@Override
public boolean contains(final Object o) {
for (BsonValue cur : this) {
if (Objects.equals(o, cur)) {
return true;
}
}
return false;
}
@Override
public Object[] toArray() {
Object[] retVal = new Object[size()];
Iterator it = iterator();
for (int i = 0; i < retVal.length; i++) {
retVal[i] = it.next();
}
return retVal;
}
@Override
@SuppressWarnings("unchecked")
public T[] toArray(final T[] a) {
int size = size();
T[] retVal = a.length >= size ? a : (T[]) java.lang.reflect.Array.newInstance(a.getClass().getComponentType(), size);
Iterator it = iterator();
for (int i = 0; i < retVal.length; i++) {
retVal[i] = (T) it.next();
}
return retVal;
}
@Override
public boolean containsAll(final Collection c) {
for (Object e : c) {
if (!contains(e)) {
return false;
}
}
return true;
}
@Override
public BsonValue get(final int index) {
if (index < 0) {
throw new IndexOutOfBoundsException("Index out of range: " + index);
}
int i = 0;
for (BsonValue cur : this) {
if (i++ == index) {
return cur;
}
}
throw new IndexOutOfBoundsException("Index out of range: " + index);
}
@Override
public int indexOf(final Object o) {
int i = 0;
for (BsonValue cur : this) {
if (Objects.equals(o, cur)) {
return i;
}
i++;
}
return -1;
}
@Override
public int lastIndexOf(final Object o) {
ListIterator listIterator = listIterator(size());
while (listIterator.hasPrevious()) {
if (Objects.equals(o, listIterator.previous())) {
return listIterator.nextIndex();
}
}
return -1;
}
@Override
public ListIterator listIterator() {
return listIterator(0);
}
@Override
public ListIterator listIterator(final int index) {
// Not the most efficient way to do this, but unlikely anyone will notice in practice
return new ArrayList<>(this).listIterator(index);
}
@Override
public List subList(final int fromIndex, final int toIndex) {
if (fromIndex < 0) {
throw new IndexOutOfBoundsException("fromIndex = " + fromIndex);
}
if (fromIndex > toIndex) {
throw new IllegalArgumentException("fromIndex(" + fromIndex + ") > toIndex(" + toIndex + ")");
}
List subList = new ArrayList<>();
int i = 0;
for (BsonValue cur: this) {
if (i == toIndex) {
break;
}
if (i >= fromIndex) {
subList.add(cur);
}
i++;
}
if (toIndex > i) {
throw new IndexOutOfBoundsException("toIndex = " + toIndex);
}
return subList;
}
@Override
public boolean add(final BsonValue bsonValue) {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
@Override
public boolean remove(final Object o) {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
@Override
public boolean addAll(final Collection c) {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
@Override
public boolean addAll(final int index, final Collection c) {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
@Override
public boolean removeAll(final Collection c) {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
@Override
public boolean retainAll(final Collection c) {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
@Override
public void clear() {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
@Override
public BsonValue set(final int index, final BsonValue element) {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
@Override
public void add(final int index, final BsonValue element) {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
@Override
public BsonValue remove(final int index) {
throw new UnsupportedOperationException(READ_ONLY_MESSAGE);
}
private class ByteBufBsonArrayIterator implements Iterator {
private final ByteBuf duplicatedByteBuf = byteBuf.duplicate();
private final BsonBinaryReader bsonReader;
{
bsonReader = new BsonBinaryReader(new ByteBufferBsonInput(duplicatedByteBuf));
// While one might expect that this would be a call to BsonReader#readStartArray that doesn't work because BsonBinaryReader
// expects to be positioned at the start at the beginning of a document, not an array. Fortunately, a BSON array has exactly
// the same structure as a BSON document (the keys are just the array indices converted to a strings). So it works fine to
// call BsonReader#readStartDocument here, and just skip all the names via BsonReader#skipName below.
bsonReader.readStartDocument();
bsonReader.readBsonType();
}
@Override
public boolean hasNext() {
return bsonReader.getCurrentBsonType() != BsonType.END_OF_DOCUMENT;
}
@Override
public BsonValue next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
bsonReader.skipName();
BsonValue value = readBsonValue(duplicatedByteBuf, bsonReader);
bsonReader.readBsonType();
return value;
}
}
}
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