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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
package com.google.protobuf;
import java.io.IOException;
import java.util.List;
import java.util.Map;
/** A reader of fields from a serialized protobuf message. */
// TODO: Refactor to allow the reader to allocate properly sized lists.
@ExperimentalApi
@CheckReturnValue
interface Reader {
/** Value used to indicate that the end of input has been reached. */
int READ_DONE = Integer.MAX_VALUE;
/** Value used to indicate that the reader does not know the tag about the field. */
int TAG_UNKNOWN = 0;
boolean shouldDiscardUnknownFields();
/**
* Gets the field number for the current field being read.
*
* TODO: Rename it to make it more explicit about the side effect on the underlying
* buffer.
*
* @return the current field number or {@link #READ_DONE} if the end of input has been reached.
*/
int getFieldNumber() throws IOException;
/**
* Gets the wire tag of the current field.
*
* @return the current wire tag or {@link #TAG_UNKNOWN} if the reader does not know the tag of the
* current field.
*/
int getTag();
/**
* Skips the current field and advances the reader to the next field.
*
* @return {@code true} if there are more fields or {@code false} if the end of input has been
* reached.
*/
boolean skipField() throws IOException;
/**
* Reads and returns the next field of type {@code DOUBLE} and advances the reader to the next
* field.
*/
double readDouble() throws IOException;
/**
* Reads and returns the next field of type {@code FLOAT} and advances the reader to the next
* field.
*/
float readFloat() throws IOException;
/**
* Reads and returns the next field of type {@code UINT64} and advances the reader to the next
* field.
*/
long readUInt64() throws IOException;
/**
* Reads and returns the next field of type {@code INT64} and advances the reader to the next
* field.
*/
long readInt64() throws IOException;
/**
* Reads and returns the next field of type {@code INT32} and advances the reader to the next
* field.
*/
int readInt32() throws IOException;
/**
* Reads and returns the next field of type {@code FIXED64} and advances the reader to the next
* field.
*/
long readFixed64() throws IOException;
/**
* Reads and returns the next field of type {@code FIXED32} and advances the reader to the next
* field.
*/
int readFixed32() throws IOException;
/**
* Reads and returns the next field of type {@code BOOL} and advances the reader to the next
* field.
*/
boolean readBool() throws IOException;
/**
* Reads and returns the next field of type {@code STRING} and advances the reader to the next
* field. If the stream contains malformed UTF-8, replace the offending bytes with the standard
* UTF-8 replacement character.
*/
String readString() throws IOException;
/**
* Reads and returns the next field of type {@code STRING} and advances the reader to the next
* field. If the stream contains malformed UTF-8, throw exception {@link
* InvalidProtocolBufferException}.
*/
String readStringRequireUtf8() throws IOException;
// TODO: the lack of other opinions for whether to expose this on the interface
T readMessageBySchemaWithCheck(Schema schema, ExtensionRegistryLite extensionRegistry)
throws IOException;
/**
* Reads and returns the next field of type {@code MESSAGE} and advances the reader to the next
* field.
*/
T readMessage(Class clazz, ExtensionRegistryLite extensionRegistry) throws IOException;
/**
* Reads and returns the next field of type {@code GROUP} and advances the reader to the next
* field.
*
* @deprecated groups fields are deprecated.
*/
@Deprecated
T readGroup(Class clazz, ExtensionRegistryLite extensionRegistry) throws IOException;
// TODO: the lack of other opinions for whether to expose this on the interface
@Deprecated
T readGroupBySchemaWithCheck(Schema schema, ExtensionRegistryLite extensionRegistry)
throws IOException;
/** Read a message field from the wire format and merge the results into the given target. */
void mergeMessageField(T target, Schema schema, ExtensionRegistryLite extensionRegistry)
throws IOException;
/** Read a group field from the wire format and merge the results into the given target. */
void mergeGroupField(T target, Schema schema, ExtensionRegistryLite extensionRegistry)
throws IOException;
/**
* Reads and returns the next field of type {@code BYTES} and advances the reader to the next
* field.
*/
ByteString readBytes() throws IOException;
/**
* Reads and returns the next field of type {@code UINT32} and advances the reader to the next
* field.
*/
int readUInt32() throws IOException;
/**
* Reads and returns the next field of type {@code ENUM} and advances the reader to the next
* field.
*/
int readEnum() throws IOException;
/**
* Reads and returns the next field of type {@code SFIXED32} and advances the reader to the next
* field.
*/
int readSFixed32() throws IOException;
/**
* Reads and returns the next field of type {@code SFIXED64} and advances the reader to the next
* field.
*/
long readSFixed64() throws IOException;
/**
* Reads and returns the next field of type {@code SINT32} and advances the reader to the next
* field.
*/
int readSInt32() throws IOException;
/**
* Reads and returns the next field of type {@code SINT64} and advances the reader to the next
* field.
*/
long readSInt64() throws IOException;
/**
* Reads the next field of type {@code DOUBLE_LIST} or {@code DOUBLE_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readDoubleList(List target) throws IOException;
/**
* Reads the next field of type {@code FLOAT_LIST} or {@code FLOAT_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readFloatList(List target) throws IOException;
/**
* Reads the next field of type {@code UINT64_LIST} or {@code UINT64_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readUInt64List(List target) throws IOException;
/**
* Reads the next field of type {@code INT64_LIST} or {@code INT64_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readInt64List(List target) throws IOException;
/**
* Reads the next field of type {@code INT32_LIST} or {@code INT32_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readInt32List(List target) throws IOException;
/**
* Reads the next field of type {@code FIXED64_LIST} or {@code FIXED64_LIST_PACKED} and advances
* the reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readFixed64List(List target) throws IOException;
/**
* Reads the next field of type {@code FIXED32_LIST} or {@code FIXED32_LIST_PACKED} and advances
* the reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readFixed32List(List target) throws IOException;
/**
* Reads the next field of type {@code BOOL_LIST} or {@code BOOL_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readBoolList(List target) throws IOException;
/**
* Reads the next field of type {@code STRING_LIST} and advances the reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readStringList(List target) throws IOException;
/**
* Reads the next field of type {@code STRING_LIST} and advances the reader to the next field. If
* the stream contains malformed UTF-8, throw exception {@link InvalidProtocolBufferException}.
*
* @param target the list that will receive the read values.
*/
void readStringListRequireUtf8(List target) throws IOException;
/**
* Reads the next field of type {@code MESSAGE_LIST} and advances the reader to the next field.
*
* @param target the list that will receive the read values.
* @param targetType the type of the elements stored in the {@code target} list.
*/
void readMessageList(
List target, Schema schema, ExtensionRegistryLite extensionRegistry) throws IOException;
void readMessageList(
List target, Class targetType, ExtensionRegistryLite extensionRegistry)
throws IOException;
/**
* Reads the next field of type {@code GROUP_LIST} and advances the reader to the next field.
*
* @param target the list that will receive the read values.
* @param targetType the type of the elements stored in the {@code target} list.
* @deprecated groups fields are deprecated.
*/
@Deprecated
void readGroupList(
List target, Class targetType, ExtensionRegistryLite extensionRegistry)
throws IOException;
@Deprecated
void readGroupList(
List target, Schema targetType, ExtensionRegistryLite extensionRegistry)
throws IOException;
/**
* Reads the next field of type {@code BYTES_LIST} and advances the reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readBytesList(List target) throws IOException;
/**
* Reads the next field of type {@code UINT32_LIST} or {@code UINT32_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readUInt32List(List target) throws IOException;
/**
* Reads the next field of type {@code ENUM_LIST} or {@code ENUM_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readEnumList(List target) throws IOException;
/**
* Reads the next field of type {@code SFIXED32_LIST} or {@code SFIXED32_LIST_PACKED} and advances
* the reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readSFixed32List(List target) throws IOException;
/**
* Reads the next field of type {@code SFIXED64_LIST} or {@code SFIXED64_LIST_PACKED} and advances
* the reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readSFixed64List(List target) throws IOException;
/**
* Reads the next field of type {@code SINT32_LIST} or {@code SINT32_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readSInt32List(List target) throws IOException;
/**
* Reads the next field of type {@code SINT64_LIST} or {@code SINT64_LIST_PACKED} and advances the
* reader to the next field.
*
* @param target the list that will receive the read values.
*/
void readSInt64List(List target) throws IOException;
/**
* Reads the next field of type {@code MAP} and advances the reader to the next field.
*
* @param target the mutable map that will receive the read values.
* @param mapDefaultEntry the default entry of the map field.
* @param extensionRegistry the extension registry for parsing message value fields.
*/
void readMap(
Map target,
MapEntryLite.Metadata mapDefaultEntry,
ExtensionRegistryLite extensionRegistry)
throws IOException;
}