com.google.protobuf.UninitializedMessageException Maven / Gradle / Ivy
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
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// 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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//
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package com.google.protobuf;
import java.util.Collections;
import java.util.List;
/**
* Thrown when attempting to build a protocol message that is missing required
* fields. This is a {@code RuntimeException} because it normally represents
* a programming error: it happens when some code which constructs a message
* fails to set all the fields. {@code parseFrom()} methods do not
* throw this; they throw an {@link InvalidProtocolBufferException} if
* required fields are missing, because it is not a programming error to
* receive an incomplete message. In other words,
* {@code UninitializedMessageException} should never be thrown by correct
* code, but {@code InvalidProtocolBufferException} might be.
*
* @author [email protected] Kenton Varda
*/
public class UninitializedMessageException extends RuntimeException {
private static final long serialVersionUID = -7466929953374883507L;
private final List missingFields;
public UninitializedMessageException(final MessageLite message) {
super("Message was missing required fields. (Lite runtime could not " +
"determine which fields were missing).");
missingFields = null;
}
public UninitializedMessageException(final List missingFields) {
super(buildDescription(missingFields));
this.missingFields = missingFields;
}
/**
* Construct the description string for this exception.
*/
private static String buildDescription(final List missingFields) {
final StringBuilder description =
new StringBuilder("Message missing required fields: ");
boolean first = true;
for (final String field : missingFields) {
if (first) {
first = false;
} else {
description.append(", ");
}
description.append(field);
}
return description.toString();
}
/**
* Get a list of human-readable names of required fields missing from this
* message. Each name is a full path to a field, e.g. "foo.bar[5].baz".
* Returns null if the lite runtime was used, since it lacks the ability to
* find missing fields.
*/
public List getMissingFields() {
return Collections.unmodifiableList(missingFields);
}
/**
* Converts this exception to an {@link InvalidProtocolBufferException}.
* When a parsed message is missing required fields, this should be thrown
* instead of {@code UninitializedMessageException}.
*/
public InvalidProtocolBufferException asInvalidProtocolBufferException() {
return new InvalidProtocolBufferException(getMessage());
}
}