package com.mongodb.client.gridfs.codecs;
import com.mongodb.client.gridfs.model.GridFSFile;
import com.mongodb.lang.Nullable;
import org.bson.BsonDateTime;
import org.bson.BsonDocument;
import org.bson.BsonDocumentReader;
import org.bson.BsonDocumentWrapper;
import org.bson.BsonInt32;
import org.bson.BsonInt64;
import org.bson.BsonReader;
import org.bson.BsonString;
import org.bson.BsonValue;
import org.bson.BsonWriter;
import org.bson.Document;
import org.bson.codecs.Codec;
import org.bson.codecs.DecoderContext;
import org.bson.codecs.EncoderContext;
import org.bson.codecs.configuration.CodecRegistry;
import java.util.Date;
import java.util.List;
import static com.mongodb.assertions.Assertions.notNull;
import static java.util.Arrays.asList;
public final class GridFSFileCodec implements Codec<GridFSFile> {
private static final List<String> VALID_FIELDS = asList("_id", "filename", "length", "chunkSize", "uploadDate", "md5", "metadata");
private final Codec<Document> documentCodec;
private final Codec<BsonDocument> bsonDocumentCodec;
public GridFSFileCodec(final CodecRegistry registry) {
this.documentCodec = notNull("DocumentCodec", notNull("registry", registry).get(Document.class));
this.bsonDocumentCodec = notNull("BsonDocumentCodec", registry.get(BsonDocument.class));
}
@Override
public GridFSFile decode(final BsonReader reader, final DecoderContext decoderContext) {
BsonDocument bsonDocument = bsonDocumentCodec.decode(reader, decoderContext);
BsonValue id = bsonDocument.get("_id");
String filename = bsonDocument.get("filename", new BsonString("")).asString().getValue();
long length = bsonDocument.getNumber("length").longValue();
int chunkSize = bsonDocument.getNumber("chunkSize").intValue();
Date uploadDate = new Date(bsonDocument.getDateTime("uploadDate").getValue());
String md5 = bsonDocument.containsKey("md5") ? bsonDocument.getString("md5").getValue() : null;
BsonDocument metadataBsonDocument = bsonDocument.getDocument("metadata", new BsonDocument());
Document optionalMetadata = asDocumentOrNull(metadataBsonDocument);
for (String key : VALID_FIELDS) {
bsonDocument.remove(key);
}
Document deprecatedExtraElements = asDocumentOrNull(bsonDocument);
return new GridFSFile(id, filename, length, chunkSize, uploadDate, md5, optionalMetadata, deprecatedExtraElements);
}
@Override
@SuppressWarnings("deprecation")
public void encode(final BsonWriter writer, final GridFSFile value, final EncoderContext encoderContext) {
BsonDocument bsonDocument = new BsonDocument();
bsonDocument.put("_id", value.getId());
bsonDocument.put("filename", new BsonString(value.getFilename()));
bsonDocument.put("length", new BsonInt64(value.getLength()));
bsonDocument.put("chunkSize", new BsonInt32(value.getChunkSize()));
bsonDocument.put("uploadDate", new BsonDateTime(value.getUploadDate().getTime()));
if (value.getMD5() != null) {
bsonDocument.put("md5", new BsonString(value.getMD5()));
}
Document metadata = value.getMetadata();
if (metadata != null) {
bsonDocument.put("metadata", new BsonDocumentWrapper<Document>(metadata, documentCodec));
}
Document extraElements = value.getExtraElements();
if (extraElements != null) {
bsonDocument.putAll(new BsonDocumentWrapper<Document>(extraElements, documentCodec));
}
bsonDocumentCodec.encode(writer, bsonDocument, encoderContext);
}
@Override
public Class<GridFSFile> getEncoderClass() {
return GridFSFile.class;
}
@Nullable
private Document asDocumentOrNull(final BsonDocument bsonDocument) {
if (bsonDocument.isEmpty()) {
return null;
} else {
BsonDocumentReader reader = new BsonDocumentReader(bsonDocument);
return documentCodec.decode(reader, DecoderContext.builder().build());
}
}
}