1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2008 Google Inc. All rights reserved.
3 // http://code.google.com/p/protobuf/
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are
9 // * Redistributions of source code must retain the above copyright
10 // notice, this list of conditions and the following disclaimer.
11 // * Redistributions in binary form must reproduce the above
12 // copyright notice, this list of conditions and the following disclaimer
13 // in the documentation and/or other materials provided with the
15 // * Neither the name of Google Inc. nor the names of its
16 // contributors may be used to endorse or promote products derived from
17 // this software without specific prior written permission.
19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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31 package com.google.protobuf;
33 import java.util.Collections;
34 import java.util.List;
37 * Thrown when attempting to build a protocol message that is missing required
38 * fields. This is a {@code RuntimeException} because it normally represents
39 * a programming error: it happens when some code which constructs a message
40 * fails to set all the fields. {@code parseFrom()} methods <b>do not</b>
41 * throw this; they throw an {@link InvalidProtocolBufferException} if
42 * required fields are missing, because it is not a programming error to
43 * receive an incomplete message. In other words,
44 * {@code UninitializedMessageException} should never be thrown by correct
45 * code, but {@code InvalidProtocolBufferException} might be.
47 * @author kenton@google.com Kenton Varda
49 public class UninitializedMessageException extends RuntimeException {
50 private static final long serialVersionUID = -7466929953374883507L;
52 public UninitializedMessageException(final MessageLite message) {
53 super("Message was missing required fields. (Lite runtime could not " +
54 "determine which fields were missing).");
58 public UninitializedMessageException(final List<String> missingFields) {
59 super(buildDescription(missingFields));
60 this.missingFields = missingFields;
63 private final List<String> missingFields;
66 * Get a list of human-readable names of required fields missing from this
67 * message. Each name is a full path to a field, e.g. "foo.bar[5].baz".
68 * Returns null if the lite runtime was used, since it lacks the ability to
69 * find missing fields.
71 public List<String> getMissingFields() {
72 return Collections.unmodifiableList(missingFields);
76 * Converts this exception to an {@link InvalidProtocolBufferException}.
77 * When a parsed message is missing required fields, this should be thrown
78 * instead of {@code UninitializedMessageException}.
80 public InvalidProtocolBufferException asInvalidProtocolBufferException() {
81 return new InvalidProtocolBufferException(getMessage());
84 /** Construct the description string for this exception. */
85 private static String buildDescription(final List<String> missingFields) {
86 final StringBuilder description =
87 new StringBuilder("Message missing required fields: ");
89 for (final String field : missingFields) {
93 description.append(", ");
95 description.append(field);
97 return description.toString();