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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.io.InputStream;
import java.util.Map;
/**
* Abstract interface implemented by Protocol Message objects.
*
* See also {@link MessageLite}, which defines most of the methods that typical users care about.
* {@link Message} adds methods that are not available in the "lite" runtime. The biggest added
* features are introspection and reflection; that is, getting descriptors for the message type and
* accessing the field values dynamically.
*
* @author [email protected] Kenton Varda
*/
@CheckReturnValue
public interface Message extends MessageLite, MessageOrBuilder {
// (From MessageLite, re-declared here only for return type covariance.)
@Override
Parser getParserForType();
// -----------------------------------------------------------------
// Comparison and hashing
/**
* Compares the specified object with this message for equality. Returns {@code true} if the given
* object is a message of the same type (as defined by {@code getDescriptorForType()}) and has
* identical values for all of its fields. Subclasses must implement this; inheriting {@code
* Object.equals()} is incorrect.
*
* @param other object to be compared for equality with this message
* @return {@code true} if the specified object is equal to this message
*/
@Override
boolean equals(Object other);
/**
* Returns the hash code value for this message. The hash code of a message should mix the
* message's type (object identity of the descriptor) with its contents (known and unknown field
* values). Subclasses must implement this; inheriting {@code Object.hashCode()} is incorrect.
*
* @return the hash code value for this message
* @see Map#hashCode()
*/
@Override
int hashCode();
// -----------------------------------------------------------------
// Convenience methods.
/**
* Converts the message to a string in protocol buffer text format. This is just a trivial wrapper
* around {@link TextFormat.Printer#printToString(MessageOrBuilder)}.
*/
@Override
String toString();
// =================================================================
// Builders
// (From MessageLite, re-declared here only for return type covariance.)
@Override
Builder newBuilderForType();
@Override
Builder toBuilder();
/** Abstract interface implemented by Protocol Message builders. */
interface Builder extends MessageLite.Builder, MessageOrBuilder {
// (From MessageLite.Builder, re-declared here only for return type
// covariance.)
@Override
@CanIgnoreReturnValue
Builder clear();
/**
* Merge {@code other} into the message being built. {@code other} must have the exact same type
* as {@code this} (i.e. {@code getDescriptorForType() == other.getDescriptorForType()}).
*
*
Merging occurs as follows. For each field:
* * For singular primitive fields, if the field is set in {@code other}, then {@code other}'s
* value overwrites the value in this message.
* * For singular message fields, if the field is set in {@code other}, it is merged into the
* corresponding sub-message of this message using the same merging rules.
* * For repeated fields, the elements in {@code other} are concatenated with the elements in
* this message.
* * For oneof groups, if the other message has one of the fields set, the group of this message
* is cleared and replaced by the field of the other message, so that the oneof constraint is
* preserved.
*
*
This is equivalent to the {@code Message::MergeFrom} method in C++.
*/
@CanIgnoreReturnValue
Builder mergeFrom(Message other);
// (From MessageLite.Builder, re-declared here only for return type
// covariance.)
@Override
Message build();
@Override
Message buildPartial();
@Override
Builder clone();
@Override
@CanIgnoreReturnValue
Builder mergeFrom(CodedInputStream input) throws IOException;
@Override
@CanIgnoreReturnValue
Builder mergeFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry)
throws IOException;
/** Get the message's type's descriptor. See {@link Message#getDescriptorForType()}. */
@Override
Descriptors.Descriptor getDescriptorForType();
/**
* Create a builder for messages of the appropriate type for the given field. The
* builder is NOT nested in the current builder. However, messages built with the
* builder can then be passed to the {@link #setField(Descriptors.FieldDescriptor, Object)},
* {@link #setRepeatedField(Descriptors.FieldDescriptor, int, Object)}, or
* {@link #addRepeatedField(Descriptors.FieldDescriptor, Object)}
* method of the current builder.
*
*
To obtain a builder nested in the current builder, use
* {@link #getFieldBuilder(Descriptors.FieldDescriptor)} instead.
*/
Builder newBuilderForField(Descriptors.FieldDescriptor field);
/**
* Get a nested builder instance for the given field.
*
*
Normally, we hold a reference to the immutable message object for the message type field.
* Some implementations (the generated message builders) can also hold a reference to
* the builder object (a nested builder) for the field.
*
*
If the field is already backed up by a nested builder, the nested builder is
* returned. Otherwise, a new field builder is created and returned. The original message
* field (if one exists) is merged into the field builder, which is then nested into its
* parent builder.
*/
Builder getFieldBuilder(Descriptors.FieldDescriptor field);
/**
* Get a nested builder instance for the given repeated field instance.
*
*
Normally, we hold a reference to the immutable message object for the message type field.
* Some implementations (the generated message builders) can also hold a reference to
* the builder object (a nested builder) for the field.
*
*
If the field is already backed up by a nested builder, the nested builder is
* returned. Otherwise, a new field builder is created and returned. The original message
* field (if one exists) is merged into the field builder, which is then nested into its
* parent builder.
*/
Builder getRepeatedFieldBuilder(Descriptors.FieldDescriptor field, int index);
/**
* Sets a field to the given value. The value must be of the correct type for this field, that
* is, the same type that {@link Message#getField(Descriptors.FieldDescriptor)} returns.
*/
@CanIgnoreReturnValue
Builder setField(Descriptors.FieldDescriptor field, Object value);
/**
* Clears the field. This is exactly equivalent to calling the generated "clear" accessor method
* corresponding to the field.
*/
@CanIgnoreReturnValue
Builder clearField(Descriptors.FieldDescriptor field);
/**
* Clears the oneof. This is exactly equivalent to calling the generated "clear" accessor method
* corresponding to the oneof.
*/
@CanIgnoreReturnValue
Builder clearOneof(Descriptors.OneofDescriptor oneof);
/**
* Sets an element of a repeated field to the given value. The value must be of the correct type
* for this field; that is, the same type that {@link
* Message#getRepeatedField(Descriptors.FieldDescriptor,int)} returns.
*
* @throws IllegalArgumentException if the field is not a repeated field, or {@code
* field.getContainingType() != getDescriptorForType()}.
*/
@CanIgnoreReturnValue
Builder setRepeatedField(Descriptors.FieldDescriptor field, int index, Object value);
/**
* Like {@code setRepeatedField}, but appends the value as a new element.
*
* @throws IllegalArgumentException if the field is not a repeated field, or {@code
* field.getContainingType() != getDescriptorForType()}
*/
@CanIgnoreReturnValue
Builder addRepeatedField(Descriptors.FieldDescriptor field, Object value);
/** Set the {@link UnknownFieldSet} for this message. */
@CanIgnoreReturnValue
Builder setUnknownFields(UnknownFieldSet unknownFields);
/** Merge some unknown fields into the {@link UnknownFieldSet} for this message. */
@CanIgnoreReturnValue
Builder mergeUnknownFields(UnknownFieldSet unknownFields);
// ---------------------------------------------------------------
// Convenience methods.
// (From MessageLite.Builder, re-declared here only for return type
// covariance.)
@Override
@CanIgnoreReturnValue
Builder mergeFrom(ByteString data) throws InvalidProtocolBufferException;
@Override
@CanIgnoreReturnValue
Builder mergeFrom(ByteString data, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
@Override
@CanIgnoreReturnValue
Builder mergeFrom(byte[] data) throws InvalidProtocolBufferException;
@Override
@CanIgnoreReturnValue
Builder mergeFrom(byte[] data, int off, int len) throws InvalidProtocolBufferException;
@Override
@CanIgnoreReturnValue
Builder mergeFrom(byte[] data, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
@Override
@CanIgnoreReturnValue
Builder mergeFrom(byte[] data, int off, int len, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
@Override
@CanIgnoreReturnValue
Builder mergeFrom(InputStream input) throws IOException;
@Override
@CanIgnoreReturnValue
Builder mergeFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
throws IOException;
@Override
boolean mergeDelimitedFrom(InputStream input) throws IOException;
@Override
boolean mergeDelimitedFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
throws IOException;
}
}