private Pair<TableSchema, Function<MappingMetaData, Optional<TypeToken<?>>>> estimateSchema(
final TableSchema providedSchema) {
final Map<String, MappingMetaData> providedData =
providedSchema
.getEntries()
.stream()
.distinct()
.collect(Collectors.toMap(MappingMetaData::getName, metaData -> metaData));
final List<MappingMetaData> metaDataList = new ArrayList<>(providedSchema.getEntries().size());
final Map<MappingMetaData, TypeToken<?>> types = new HashMap<>();
try (final ResultSet result = database.get().execute("SHOW COLUMNS FROM " + tableName)) {
while (result.next()) {
final String name = result.getString("Field");
final boolean isPrimaryKey = result.getString("Key").equals("PRI");
final String defaultValue;
{
final String cache = result.getString("Default");
if (cache == null || "null".equals(cache)) defaultValue = "";
else defaultValue = cache;
}
final TypeToken<?> type = getJavaTypeOf(result.getString("Type"), isPrimaryKey);
final MappingMetaData finalMetaData;
final MappingMetaData data = providedData.get(name);
if (Objects.nonNull(data)) {
// Complete info
finalMetaData =
new AbstractMappingMetaData() {
@Override
public String getName() {
return data.getName();
}
@Override
public String getTarget() {
return data.getTarget();
}
@Override
public String getDescription() {
return data.getDescription();
}
@Override
public String getCategory() {
return data.getCategory();
};
@Override
public String getDefaultValue() {
return data.getDefaultValue().isEmpty() ? defaultValue : data.getDefaultValue();
};
@Override
public int getIndex() {
return data.getIndex();
}
@Override
public boolean isKey() {
return data.isKey() ? true : isPrimaryKey;
}
@Override
public String getAlias() {
return data.getAlias();
}
};
} else if (providedSchema.getPolicy().hasPermissionToAddColumns()) {
// Add column
finalMetaData =
new AbstractMappingMetaData() {
@Override
public String getName() {
return name;
}
@Override
public String getDescription() {
return "Auto completed";
}
@Override
public String getDefaultValue() {
return defaultValue;
};
@Override
public boolean isKey() {
return isPrimaryKey;
}
};
} else continue;
metaDataList.add(finalMetaData);
types.put(finalMetaData, type);
}
} catch (final Throwable t) {
throw new DatabaseConnectionException(t);
}
// Get Fields of the table
return new Pair<>(
new TableSchema() {
private final List<MappingMetaData> entries = Collections.unmodifiableList(metaDataList);
@Override
public SchemaPolicy getPolicy() {
return providedSchema.getPolicy();
}
@Override
public String getStructure() {
return providedSchema.getStructure();
}
@Override
public String getName() {
return providedSchema.getName();
}
@Override
public ClientStorageFormat getFormat() {
return providedSchema.getFormat();
}
@Override
public List<MappingMetaData> getEntries() {
return entries;
}
},
m -> Optional.ofNullable(types.get(m)));
}
public ServerStorageImpl(
final String databaseId, final String tableName, final ChangeTrackerImpl changeTracker)
throws ServerStorageException {
this.databaseId = databaseId;
this.tableName = tableName;
this.changeTracker = changeTracker;
this.database.bind(FrameworkServiceImpl.getDatabasePoolService().requestConnection(databaseId));
final Optional<TableSchema> trySchema =
FrameworkServiceImpl.getConfigService()
.getActiveEnvironment()
.getDatabaseConfig(databaseId)
.schema()
.get()
.getSchemaOf(tableName);
// Estimate tables without provided schema
// Create empty schema
final TableSchema providedSchema =
trySchema.orElseGet(
() -> {
return new TableSchema() {
private final List<MappingMetaData> entries = Collections.emptyList();
@Override
public SchemaPolicy getPolicy() {
return SchemaPolicy.LAZY;
}
@Override
public String getStructure() {
return UnknownServerStorageStructure.class.getCanonicalName();
}
@Override
public String getName() {
return tableName;
}
@Override
public ClientStorageFormat getFormat() {
throw new UnsupportedOperationException();
}
@Override
public List<MappingMetaData> getEntries() {
return entries;
}
};
});
final TableSchema schema;
final Function<MappingMetaData, Optional<TypeToken<?>>> typeReceiver;
if (!providedSchema.getPolicy().hasPermissionToComplete()) {
schema = providedSchema;
typeReceiver = metaData -> Optional.empty();
} else {
final Pair<TableSchema, Function<MappingMetaData, Optional<TypeToken<?>>>> result =
estimateSchema(providedSchema);
schema = result.first();
typeReceiver = result.second();
}
this.structureName = schema.getStructure();
mapper =
new JsonMapper<>(
schema,
SQLToPropertyMappingAdapterHolder.<T>get(),
Arrays.asList(ServerStorageStructurePrivateBase.class),
ServerStorageStructureBaseImplementation.class,
typeReceiver);
statementObject =
tableName + PreparedStatements.STATEMENT_SELECT_ROW.toString() + (/*FIXME*/ INCREMENT++);
selectLowPart = createSelectFormat();
statementFormat = createStatementFormat();
this.database.addListener(
new ChangeListener<Database>() {
@Override
public void changed(
final ObservableValue<? extends Database> observable,
final Database oldValue,
final Database newValue) {
alive.unbind();
if (Objects.nonNull(newValue)) {
alive.bind(newValue.alive());
registerStatements();
} else alive.set(false);
}
});
registerStatements();
}
