// 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.
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// 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
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package com.google.protobuf;

import java.io.IOException;

/**
 * Thrown when a protocol message being parsed is invalid in some way, e.g. it contains a malformed
 * varint or a negative byte length.
 *
 * @author kenton@google.com Kenton Varda
 */
public class InvalidProtocolBufferException extends IOException {
  private static final long serialVersionUID = -1616151763072450476L;
  private MessageLite unfinishedMessage = null;

  public InvalidProtocolBufferException(final String description) {
    super(description);
  }

  public InvalidProtocolBufferException(IOException e) {
    super(e.getMessage(), e);
  }

  public InvalidProtocolBufferException(final String description, IOException e) {
    super(description, e);
  }

  /**
   * Attaches an unfinished message to the exception to support best-effort parsing in {@code
   * Parser} interface.
   *
   * @return this
   */
  public InvalidProtocolBufferException setUnfinishedMessage(MessageLite unfinishedMessage) {
    this.unfinishedMessage = unfinishedMessage;
    return this;
  }

  /**
   * Returns the unfinished message attached to the exception, or null if no message is attached.
   */
  public MessageLite getUnfinishedMessage() {
    return unfinishedMessage;
  }

  /**
   * Unwraps the underlying {@link IOException} if this exception was caused by an I/O problem.
   * Otherwise, returns {@code this}.
   */
  public IOException unwrapIOException() {
    return getCause() instanceof IOException ? (IOException) getCause() : this;
  }

  static InvalidProtocolBufferException truncatedMessage() {
    return new InvalidProtocolBufferException(
        "While parsing a protocol message, the input ended unexpectedly "
            + "in the middle of a field.  This could mean either that the "
            + "input has been truncated or that an embedded message "
            + "misreported its own length.");
  }

  static InvalidProtocolBufferException negativeSize() {
    return new InvalidProtocolBufferException(
        "CodedInputStream encountered an embedded string or message "
            + "which claimed to have negative size.");
  }

  static InvalidProtocolBufferException malformedVarint() {
    return new InvalidProtocolBufferException("CodedInputStream encountered a malformed varint.");
  }

  static InvalidProtocolBufferException invalidTag() {
    return new InvalidProtocolBufferException("Protocol message contained an invalid tag (zero).");
  }

  static InvalidProtocolBufferException invalidEndTag() {
    return new InvalidProtocolBufferException(
        "Protocol message end-group tag did not match expected tag.");
  }

  static InvalidWireTypeException invalidWireType() {
    return new InvalidWireTypeException("Protocol message tag had invalid wire type.");
  }

  /** Exception indicating that and unexpected wire type was encountered for a field. */
  @ExperimentalApi
  public static class InvalidWireTypeException extends InvalidProtocolBufferException {
    private static final long serialVersionUID = 3283890091615336259L;

    public InvalidWireTypeException(String description) {
      super(description);
    }
  }

  static InvalidProtocolBufferException recursionLimitExceeded() {
    return new InvalidProtocolBufferException(
        "Protocol message had too many levels of nesting.  May be malicious.  "
            + "Use CodedInputStream.setRecursionLimit() to increase the depth limit.");
  }

  static InvalidProtocolBufferException sizeLimitExceeded() {
    return new InvalidProtocolBufferException(
        "Protocol message was too large.  May be malicious.  "
            + "Use CodedInputStream.setSizeLimit() to increase the size limit.");
  }

  static InvalidProtocolBufferException parseFailure() {
    return new InvalidProtocolBufferException("Failed to parse the message.");
  }

  static InvalidProtocolBufferException invalidUtf8() {
    return new InvalidProtocolBufferException("Protocol message had invalid UTF-8.");
  }
}
