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• AbstractParser.java

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com.google.protobuf.AbstractParser Maven / Gradle / Ivy

// 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 com.google.protobuf.AbstractMessageLite.Builder.LimitedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

/**
 * A partial implementation of the {@link Parser} interface which implements as many methods of that
 * interface as possible in terms of other methods.
 *
 * 
Note: This class implements all the convenience methods in the {@link Parser} interface. See
 * {@link Parser} for related javadocs. Subclasses need to implement {@link
 * Parser#parsePartialFrom(CodedInputStream, ExtensionRegistryLite)}
 *
 * @author [email protected] (Pherl Liu)
 */
public abstract class AbstractParser
    implements Parser {
  /** Creates an UninitializedMessageException for MessageType. */
  private UninitializedMessageException newUninitializedMessageException(MessageType message) {
    if (message instanceof AbstractMessageLite) {
      return ((AbstractMessageLite) message).newUninitializedMessageException();
    }
    return new UninitializedMessageException(message);
  }

  /**
   * Helper method to check if message is initialized.
   *
   * @throws InvalidProtocolBufferException if it is not initialized.
   * @return The message to check.
   */
  private MessageType checkMessageInitialized(MessageType message)
      throws InvalidProtocolBufferException {
    if (message != null && !message.isInitialized()) {
      throw newUninitializedMessageException(message)
          .asInvalidProtocolBufferException()
          .setUnfinishedMessage(message);
    }
    return message;
  }

  private static final ExtensionRegistryLite EMPTY_REGISTRY =
      ExtensionRegistryLite.getEmptyRegistry();

  @Override
  public MessageType parsePartialFrom(CodedInputStream input)
      throws InvalidProtocolBufferException {
    return parsePartialFrom(input, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parseFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    return checkMessageInitialized(parsePartialFrom(input, extensionRegistry));
  }

  @Override
  public MessageType parseFrom(CodedInputStream input) throws InvalidProtocolBufferException {
    return parseFrom(input, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parsePartialFrom(ByteString data, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    MessageType message;
    try {
      CodedInputStream input = data.newCodedInput();
      message = parsePartialFrom(input, extensionRegistry);
      try {
        input.checkLastTagWas(0);
      } catch (InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(message);
      }
      return message;
    } catch (InvalidProtocolBufferException e) {
      throw e;
    }
  }

  @Override
  public MessageType parsePartialFrom(ByteString data) throws InvalidProtocolBufferException {
    return parsePartialFrom(data, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parseFrom(ByteString data, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    return checkMessageInitialized(parsePartialFrom(data, extensionRegistry));
  }

  @Override
  public MessageType parseFrom(ByteString data) throws InvalidProtocolBufferException {
    return parseFrom(data, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parseFrom(ByteBuffer data, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    MessageType message;
    try {
      CodedInputStream input = CodedInputStream.newInstance(data);
      message = parsePartialFrom(input, extensionRegistry);
      try {
        input.checkLastTagWas(0);
      } catch (InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(message);
      }
    } catch (InvalidProtocolBufferException e) {
      throw e;
    }

    return checkMessageInitialized(message);
  }

  @Override
  public MessageType parseFrom(ByteBuffer data) throws InvalidProtocolBufferException {
    return parseFrom(data, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parsePartialFrom(
      byte[] data, int off, int len, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    try {
      CodedInputStream input = CodedInputStream.newInstance(data, off, len);
      MessageType message = parsePartialFrom(input, extensionRegistry);
      try {
        input.checkLastTagWas(0);
      } catch (InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(message);
      }
      return message;
    } catch (InvalidProtocolBufferException e) {
      throw e;
    }
  }

  @Override
  public MessageType parsePartialFrom(byte[] data, int off, int len)
      throws InvalidProtocolBufferException {
    return parsePartialFrom(data, off, len, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parsePartialFrom(byte[] data, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    return parsePartialFrom(data, 0, data.length, extensionRegistry);
  }

  @Override
  public MessageType parsePartialFrom(byte[] data) throws InvalidProtocolBufferException {
    return parsePartialFrom(data, 0, data.length, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parseFrom(
      byte[] data, int off, int len, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    return checkMessageInitialized(parsePartialFrom(data, off, len, extensionRegistry));
  }

  @Override
  public MessageType parseFrom(byte[] data, int off, int len)
      throws InvalidProtocolBufferException {
    return parseFrom(data, off, len, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parseFrom(byte[] data, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    return parseFrom(data, 0, data.length, extensionRegistry);
  }

  @Override
  public MessageType parseFrom(byte[] data) throws InvalidProtocolBufferException {
    return parseFrom(data, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parsePartialFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    CodedInputStream codedInput = CodedInputStream.newInstance(input);
    MessageType message = parsePartialFrom(codedInput, extensionRegistry);
    try {
      codedInput.checkLastTagWas(0);
    } catch (InvalidProtocolBufferException e) {
      throw e.setUnfinishedMessage(message);
    }
    return message;
  }

  @Override
  public MessageType parsePartialFrom(InputStream input) throws InvalidProtocolBufferException {
    return parsePartialFrom(input, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parseFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    return checkMessageInitialized(parsePartialFrom(input, extensionRegistry));
  }

  @Override
  public MessageType parseFrom(InputStream input) throws InvalidProtocolBufferException {
    return parseFrom(input, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parsePartialDelimitedFrom(
      InputStream input, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    int size;
    try {
      int firstByte = input.read();
      if (firstByte == -1) {
        return null;
      }
      size = CodedInputStream.readRawVarint32(firstByte, input);
    } catch (IOException e) {
      throw new InvalidProtocolBufferException(e);
    }
    InputStream limitedInput = new LimitedInputStream(input, size);
    return parsePartialFrom(limitedInput, extensionRegistry);
  }

  @Override
  public MessageType parsePartialDelimitedFrom(InputStream input)
      throws InvalidProtocolBufferException {
    return parsePartialDelimitedFrom(input, EMPTY_REGISTRY);
  }

  @Override
  public MessageType parseDelimitedFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
      throws InvalidProtocolBufferException {
    return checkMessageInitialized(parsePartialDelimitedFrom(input, extensionRegistry));
  }

  @Override
  public MessageType parseDelimitedFrom(InputStream input) throws InvalidProtocolBufferException {
    return parseDelimitedFrom(input, EMPTY_REGISTRY);
  }
}