C++ (Cpp) FieldRef::dottedSubstring示例

示例#1

文件： path_support.cpp 项目： stevelyall/mongol-db

/**
 * Helper function to check if the current equality match paths conflict with a new path.
 */
static Status checkEqualityConflicts(const EqualityMatches& equalities, const FieldRef& path) {
    int parentPathPart = -1;
    const BSONElement& parentEl = findParentEqualityElement(equalities, path, &parentPathPart);

    if (parentEl.eoo())
        return Status::OK();

    string errMsg = "cannot infer query fields to set, ";

    StringData pathStr = path.dottedField();
    StringData prefixStr = path.dottedSubstring(0, parentPathPart);
    StringData suffixStr = path.dottedSubstring(parentPathPart, path.numParts());

    if (suffixStr.size() != 0)
        errMsg += stream() << "both paths '" << pathStr << "' and '" << prefixStr
                           << "' are matched";
    else
        errMsg += stream() << "path '" << pathStr << "' is matched twice";

    return Status(ErrorCodes::NotSingleValueField, errMsg);
}

示例#2

文件： shard_key_pattern.cpp 项目： DavidAlphaFox/mongodb

static BSONElement findEqualityElement(const EqualityMatches& equalities, const FieldRef& path) {
    int parentPathPart;
    const BSONElement& parentEl =
        pathsupport::findParentEqualityElement(equalities, path, &parentPathPart);

    if (parentPathPart == static_cast<int>(path.numParts()))
        return parentEl;

    if (parentEl.type() != Object)
        return BSONElement();

    StringData suffixStr = path.dottedSubstring(parentPathPart, path.numParts());
    BSONMatchableDocument matchable(parentEl.Obj());
    return extractKeyElementFromMatchable(matchable, suffixStr);
}