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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// 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.
package com.google.protobuf;
import static com.google.protobuf.Internal.checkNotNull;
/**
* Manufactures schemas for proto3 messages. Message classes must extend {@link
* com.google.protobuf.GeneratedMessage} or {@link com.google.protobuf.GeneratedMessageLite}.
*/
@ExperimentalApi
public final class Proto3SchemaFactory implements SchemaFactory {
/**
* The mode with which to generate schemas.
*
* <p>For testing purposes only.
*/
public enum Mode {
/** Always use a table-based indexing of fields. */
TABLE,
/** Always used lookup-based (i.e. binary search) indexing of fields. */
LOOKUP,
/**
* Default. Determine the appropriate field indexing mode based on how sparse the field numbers
* are for the message.
*/
DYNAMIC
}
private final MessageInfoFactory messageDescriptorFactory;
private final Mode mode;
public Proto3SchemaFactory() {
this(DescriptorMessageInfoFactory.getInstance());
}
public Proto3SchemaFactory(MessageInfoFactory messageDescriptorFactory) {
this(messageDescriptorFactory, Mode.DYNAMIC);
}
/** For testing purposes only. Allows specification of {@link Mode}. */
public Proto3SchemaFactory(MessageInfoFactory messageDescriptorFactory, Mode mode) {
if (!isSupported()) {
throw new IllegalStateException("Schema factory is unsupported on this platform");
}
this.messageDescriptorFactory =
checkNotNull(messageDescriptorFactory, "messageDescriptorFactory");
this.mode = checkNotNull(mode, "mode");
}
public static boolean isSupported() {
return UnsafeUtil.hasUnsafeArrayOperations() && UnsafeUtil.hasUnsafeByteBufferOperations();
}
@Override
public <T> Schema<T> createSchema(Class<T> messageType) {
SchemaUtil.requireGeneratedMessage(messageType);
MessageInfo descriptor = messageDescriptorFactory.messageInfoFor(messageType);
switch (mode) {
case TABLE:
return newTableSchema(messageType, descriptor);
case LOOKUP:
return newLookupSchema(messageType, descriptor);
default:
return SchemaUtil.shouldUseTableSwitch(descriptor.getFields())
? newTableSchema(messageType, descriptor)
: newLookupSchema(messageType, descriptor);
}
}
private <T> Schema<T> newTableSchema(Class<T> messageType, MessageInfo descriptor) {
if (GeneratedMessageLite.class.isAssignableFrom(messageType)) {
return new Proto3LiteTableSchema<T>(messageType, descriptor);
}
return new Proto3TableSchema<T>(messageType, descriptor);
}
private <T> Schema<T> newLookupSchema(Class<T> messageType, MessageInfo descriptor) {
if (GeneratedMessageLite.class.isAssignableFrom(messageType)) {
return new Proto3LiteLookupSchema<T>(messageType, descriptor);
}
return new Proto3LookupSchema<T>(messageType, descriptor);
}
}
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