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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 com.mongodb.lang.Nullable;
import org.bson.BsonBinaryReader;
import org.bson.BsonDocument;
import org.bson.BsonType;
import org.bson.BsonValue;
import org.bson.ByteBuf;
import org.bson.RawBsonDocument;
import org.bson.codecs.BsonDocumentCodec;
import org.bson.codecs.DecoderContext;
import org.bson.io.ByteBufferBsonInput;
import org.bson.json.JsonMode;
import org.bson.json.JsonWriter;
import org.bson.json.JsonWriterSettings;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.StringWriter;
import java.util.AbstractCollection;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import static com.mongodb.assertions.Assertions.assertNotNull;
import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.internal.connection.ByteBufBsonHelper.readBsonValue;
final class ByteBufBsonDocument extends BsonDocument {
private static final long serialVersionUID = 2L;
private final transient ByteBuf byteBuf;
static List createList(final ByteBufferBsonOutput bsonOutput, final int startPosition) {
List duplicateByteBuffers = bsonOutput.getByteBuffers();
CompositeByteBuf outputByteBuf = new CompositeByteBuf(duplicateByteBuffers);
outputByteBuf.position(startPosition);
List documents = new ArrayList<>();
int curDocumentStartPosition = startPosition;
while (outputByteBuf.hasRemaining()) {
int documentSizeInBytes = outputByteBuf.getInt();
ByteBuf slice = outputByteBuf.duplicate();
slice.position(curDocumentStartPosition);
slice.limit(curDocumentStartPosition + documentSizeInBytes);
documents.add(new ByteBufBsonDocument(slice));
curDocumentStartPosition += documentSizeInBytes;
outputByteBuf.position(outputByteBuf.position() + documentSizeInBytes - 4);
}
for (ByteBuf byteBuffer : duplicateByteBuffers) {
byteBuffer.release();
}
return documents;
}
static ByteBufBsonDocument createOne(final ByteBufferBsonOutput bsonOutput, final int startPosition) {
List duplicateByteBuffers = bsonOutput.getByteBuffers();
CompositeByteBuf outputByteBuf = new CompositeByteBuf(duplicateByteBuffers);
outputByteBuf.position(startPosition);
int documentSizeInBytes = outputByteBuf.getInt();
ByteBuf slice = outputByteBuf.duplicate();
slice.position(startPosition);
slice.limit(startPosition + documentSizeInBytes);
for (ByteBuf byteBuffer : duplicateByteBuffers) {
byteBuffer.release();
}
return new ByteBufBsonDocument(slice);
}
@Override
public String toJson() {
return toJson(JsonWriterSettings.builder().outputMode(JsonMode.RELAXED).build());
}
@Override
public String toJson(final JsonWriterSettings settings) {
StringWriter stringWriter = new StringWriter();
JsonWriter jsonWriter = new JsonWriter(stringWriter, settings);
ByteBuf duplicate = byteBuf.duplicate();
try (BsonBinaryReader reader = new BsonBinaryReader(new ByteBufferBsonInput(duplicate))) {
jsonWriter.pipe(reader);
return stringWriter.toString();
} finally {
duplicate.release();
}
}
@Override
public BsonBinaryReader asBsonReader() {
return new BsonBinaryReader(new ByteBufferBsonInput(byteBuf.duplicate()));
}
@SuppressWarnings("MethodDoesntCallSuperMethod")
@Override
public BsonDocument clone() {
byte[] clonedBytes = new byte[byteBuf.remaining()];
byteBuf.get(byteBuf.position(), clonedBytes);
return new RawBsonDocument(clonedBytes);
}
@Nullable
T findInDocument(final Finder finder) {
ByteBuf duplicateByteBuf = byteBuf.duplicate();
try (BsonBinaryReader bsonReader = new BsonBinaryReader(new ByteBufferBsonInput(duplicateByteBuf))) {
bsonReader.readStartDocument();
while (bsonReader.readBsonType() != BsonType.END_OF_DOCUMENT) {
T found = finder.find(duplicateByteBuf, bsonReader);
if (found != null) {
return found;
}
}
bsonReader.readEndDocument();
} finally {
duplicateByteBuf.release();
}
return finder.notFound();
}
int getSizeInBytes() {
return byteBuf.getInt(byteBuf.position());
}
BsonDocument toBaseBsonDocument() {
ByteBuf duplicateByteBuf = byteBuf.duplicate();
try (BsonBinaryReader bsonReader = new BsonBinaryReader(new ByteBufferBsonInput(duplicateByteBuf))) {
return new BsonDocumentCodec().decode(bsonReader, DecoderContext.builder().build());
} finally {
duplicateByteBuf.release();
}
}
ByteBufBsonDocument(final ByteBuf byteBuf) {
this.byteBuf = byteBuf;
}
@Override
public void clear() {
throw new UnsupportedOperationException("ByteBufBsonDocument instances are immutable");
}
@Override
public BsonValue put(final String key, final BsonValue value) {
throw new UnsupportedOperationException("ByteBufBsonDocument instances are immutable");
}
@Override
public BsonDocument append(final String key, final BsonValue value) {
throw new UnsupportedOperationException("ByteBufBsonDocument instances are immutable");
}
@Override
public void putAll(final Map m) {
throw new UnsupportedOperationException("ByteBufBsonDocument instances are immutable");
}
@Override
public BsonValue remove(final Object key) {
throw new UnsupportedOperationException("ByteBufBsonDocument instances are immutable");
}
@Override
public boolean isEmpty() {
return assertNotNull(findInDocument(new Finder() {
@Override
public Boolean find(final ByteBuf byteBuf, final BsonBinaryReader bsonReader) {
return false;
}
@Override
public Boolean notFound() {
return true;
}
}));
}
@Override
public int size() {
return assertNotNull(findInDocument(new Finder() {
private int size;
@Override
@Nullable
public Integer find(final ByteBuf byteBuf, final BsonBinaryReader bsonReader) {
size++;
bsonReader.readName();
bsonReader.skipValue();
return null;
}
@Override
public Integer notFound() {
return size;
}
}));
}
@Override
public Set> entrySet() {
return new ByteBufBsonDocumentEntrySet();
}
@Override
public Collection values() {
return new ByteBufBsonDocumentValuesCollection();
}
@Override
public Set keySet() {
return new ByteBufBsonDocumentKeySet();
}
@Override
public boolean containsKey(final Object key) {
if (key == null) {
throw new IllegalArgumentException("key can not be null");
}
Boolean containsKey = findInDocument(new Finder() {
@Override
public Boolean find(final ByteBuf byteBuf, final BsonBinaryReader bsonReader) {
if (bsonReader.readName().equals(key)) {
return true;
}
bsonReader.skipValue();
return null;
}
@Override
public Boolean notFound() {
return false;
}
});
return containsKey != null ? containsKey : false;
}
@Override
public boolean containsValue(final Object value) {
Boolean containsValue = findInDocument(new Finder() {
@Override
public Boolean find(final ByteBuf byteBuf, final BsonBinaryReader bsonReader) {
bsonReader.skipName();
if (readBsonValue(byteBuf, bsonReader).equals(value)) {
return true;
}
return null;
}
@Override
public Boolean notFound() {
return false;
}
});
return containsValue != null ? containsValue : false;
}
@Nullable
@Override
public BsonValue get(final Object key) {
notNull("key", key);
return findInDocument(new Finder() {
@Override
public BsonValue find(final ByteBuf byteBuf, final BsonBinaryReader bsonReader) {
if (bsonReader.readName().equals(key)) {
return readBsonValue(byteBuf, bsonReader);
}
bsonReader.skipValue();
return null;
}
@Nullable
@Override
public BsonValue notFound() {
return null;
}
});
}
/**
* Gets the first key in this document.
*
* @return the first key in this document
* @throws java.util.NoSuchElementException if the document is empty
*/
public String getFirstKey() {
return assertNotNull(findInDocument(new Finder() {
@Override
public String find(final ByteBuf byteBuf, final BsonBinaryReader bsonReader) {
return bsonReader.readName();
}
@Override
public String notFound() {
throw new NoSuchElementException();
}
}));
}
private interface Finder {
@Nullable
T find(ByteBuf byteBuf, BsonBinaryReader bsonReader);
@Nullable
T notFound();
}
// see https://docs.oracle.com/javase/6/docs/platform/serialization/spec/output.html
private Object writeReplace() {
return toBaseBsonDocument();
}
// see https://docs.oracle.com/javase/6/docs/platform/serialization/spec/input.html
private void readObject(final ObjectInputStream stream) throws InvalidObjectException {
throw new InvalidObjectException("Proxy required");
}
private class ByteBufBsonDocumentEntrySet extends AbstractSet> {
@Override
public Iterator> iterator() {
return new Iterator>() {
private final ByteBuf duplicatedByteBuf = byteBuf.duplicate();
private final BsonBinaryReader bsonReader;
{
bsonReader = new BsonBinaryReader(new ByteBufferBsonInput(duplicatedByteBuf));
bsonReader.readStartDocument();
bsonReader.readBsonType();
}
@Override
public boolean hasNext() {
return bsonReader.getCurrentBsonType() != BsonType.END_OF_DOCUMENT;
}
@Override
public Entry next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
String key = bsonReader.readName();
BsonValue value = readBsonValue(duplicatedByteBuf, bsonReader);
bsonReader.readBsonType();
return new AbstractMap.SimpleEntry<>(key, value);
}
};
}
@Override
public boolean isEmpty() {
return !iterator().hasNext();
}
@Override
public int size() {
return ByteBufBsonDocument.this.size();
}
}
private class ByteBufBsonDocumentKeySet extends AbstractSet {
@SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
private final Set> entrySet = new ByteBufBsonDocumentEntrySet();
@Override
public Iterator iterator() {
final Iterator> entrySetIterator = entrySet.iterator();
return new Iterator() {
@Override
public boolean hasNext() {
return entrySetIterator.hasNext();
}
@Override
public String next() {
return entrySetIterator.next().getKey();
}
};
}
@Override
public boolean isEmpty() {
return entrySet.isEmpty();
}
@Override
public int size() {
return entrySet.size();
}
}
private class ByteBufBsonDocumentValuesCollection extends AbstractCollection {
@SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
private final Set> entrySet = new ByteBufBsonDocumentEntrySet();
@Override
public Iterator iterator() {
final Iterator> entrySetIterator = entrySet.iterator();
return new Iterator() {
@Override
public boolean hasNext() {
return entrySetIterator.hasNext();
}
@Override
public BsonValue next() {
return entrySetIterator.next().getValue();
}
};
}
@Override
public boolean isEmpty() {
return entrySet.isEmpty();
}
@Override
public int size() {
return entrySet.size();
}
}
}
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