// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// TODO(kenton): Use generics? E.g. Builder<BuilderType extends Builder>, then
// mergeFrom*() could return BuilderType for better type-safety.
package com.google.protobuf;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
/**
* Abstract interface implemented by Protocol Message objects.
* <p>
* See also {@link MessageLite}, which defines most of the methods that typical
* users care about. {@link Message} adds to it methods that are not available
* in the "lite" runtime. The biggest added features are introspection and
* reflection -- i.e., getting descriptors for the message type and accessing
* the field values dynamically.
*
* @author kenton@google.com Kenton Varda
*/
public interface Message extends MessageLite, MessageOrBuilder {
// (From MessageLite, re-declared here only for return type covariance.)
Parser<? extends Message> 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#printToString(MessageOrBuilder)}.
*/
@Override
String toString();
// =================================================================
// Builders
// (From MessageLite, re-declared here only for return type covariance.)
Builder newBuilderForType();
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.)
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:<br>
* * For singular primitive fields, if the field is set in {@code other},
* then {@code other}'s value overwrites the value in this message.<br>
* * 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.<br>
* * For repeated fields, the elements in {@code other} are concatenated
* with the elements in this message.
*
* This is equivalent to the {@code Message::MergeFrom} method in C++.
*/
Builder mergeFrom(Message other);
// (From MessageLite.Builder, re-declared here only for return type
// covariance.)
Message build();
Message buildPartial();
Builder clone();
Builder mergeFrom(CodedInputStream input) throws IOException;
Builder mergeFrom(CodedInputStream input,
ExtensionRegistryLite extensionRegistry)
throws IOException;
/**
* Get the message's type's descriptor.
* See {@link Message#getDescriptorForType()}.
*/
Descriptors.Descriptor getDescriptorForType();
/**
* Create a Builder for messages of the appropriate type for the given
* field. Messages built with this can then be passed to setField(),
* setRepeatedField(), or addRepeatedField().
*/
Builder newBuilderForField(Descriptors.FieldDescriptor field);
/**
* Get a nested builder instance for the given field.
* <p>
* Normally, we hold a reference to the immutable message object for the
* message type field. Some implementations(the generated message builders),
* however, can also hold a reference to the builder object (a nested
* builder) for the field.
* <p>
* If the field is already backed up by a nested builder, the nested builder
* will be returned. Otherwise, a new field builder will be created and
* returned. The original message field (if exist) will be merged into the
* field builder, which will then be nested into its parent builder.
* <p>
* NOTE: implementations that do not support nested builders will throw
* <code>UnsupportedException</code>.
*/
Builder getFieldBuilder(Descriptors.FieldDescriptor field);
/**
* Sets a field to the given value. The value must be of the correct type
* for this field, i.e. the same type that
* {@link Message#getField(Descriptors.FieldDescriptor)} would return.
*/
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.
*/
Builder clearField(Descriptors.FieldDescriptor field);
/**
* Sets an element of a repeated field to the given value. The value must
* be of the correct type for this field, i.e. the same type that
* {@link Message#getRepeatedField(Descriptors.FieldDescriptor,int)} would
* return.
* @throws IllegalArgumentException The field is not a repeated field, or
* {@code field.getContainingType() != getDescriptorForType()}.
*/
Builder setRepeatedField(Descriptors.FieldDescriptor field,
int index, Object value);
/**
* Like {@code setRepeatedField}, but appends the value as a new element.
* @throws IllegalArgumentException The field is not a repeated field, or
* {@code field.getContainingType() != getDescriptorForType()}.
*/
Builder addRepeatedField(Descriptors.FieldDescriptor field, Object value);
/** Set the {@link UnknownFieldSet} for this message. */
Builder setUnknownFields(UnknownFieldSet unknownFields);
/**
* Merge some unknown fields into the {@link UnknownFieldSet} for this
* message.
*/
Builder mergeUnknownFields(UnknownFieldSet unknownFields);
// ---------------------------------------------------------------
// Convenience methods.
// (From MessageLite.Builder, re-declared here only for return type
// covariance.)
Builder mergeFrom(ByteString data) throws InvalidProtocolBufferException;
Builder mergeFrom(ByteString data,
ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
Builder mergeFrom(byte[] data) throws InvalidProtocolBufferException;
Builder mergeFrom(byte[] data, int off, int len)
throws InvalidProtocolBufferException;
Builder mergeFrom(byte[] data,
ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
Builder mergeFrom(byte[] data, int off, int len,
ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException;
Builder mergeFrom(InputStream input) throws IOException;
Builder mergeFrom(InputStream input,
ExtensionRegistryLite extensionRegistry)
throws IOException;
boolean mergeDelimitedFrom(InputStream input)
throws IOException;
boolean mergeDelimitedFrom(InputStream input,
ExtensionRegistryLite extensionRegistry)
throws IOException;
}
}