baljsn_datumencoderoptions.h

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/// @file baljsn_datumencoderoptions.h
///
/// The content of this file has been pre-processed for Doxygen.
///
 
 
// baljsn_datumencoderoptions.h                                       -*-C++-*-
#ifndef INCLUDED_BALJSN_DATUMENCODEROPTIONS
#define INCLUDED_BALJSN_DATUMENCODEROPTIONS
 
#include <bsls_ident.h>
BSLS_IDENT("$Id: $")
 
/// @defgroup baljsn_datumencoderoptions baljsn_datumencoderoptions
/// @brief  Provide an attribute class for specifying Datum<->JSON options.
/// @addtogroup bal
/// @{
/// @addtogroup baljsn
/// @{
/// @addtogroup baljsn_datumencoderoptions
/// @{
///
/// <h1> Outline </h1>
/// * <a href="#baljsn_datumencoderoptions-purpose"> Purpose</a>
/// * <a href="#baljsn_datumencoderoptions-classes"> Classes </a>
/// * <a href="#baljsn_datumencoderoptions-description"> Description </a>
///   * <a href="#baljsn_datumencoderoptions-attributes"> Attributes </a>
///   * <a href="#baljsn_datumencoderoptions-usage"> Usage </a>
///     * <a href="#baljsn_datumencoderoptions-example-1-creating-and-populating-an-options-object"> Example 1: Creating and Populating an Options Object </a>
///
/// # Purpose {#baljsn_datumencoderoptions-purpose}
/// Provide an attribute class for specifying Datum<->JSON options.
///
/// # Classes {#baljsn_datumencoderoptions-classes}
///
/// -  baljsn::DatumEncoderOptions: options for JSON encoding `Datum` objects
///
/// @see  baljsn_datumutil
///
/// # Description {#baljsn_datumencoderoptions-description}
/// This component provides a single, simply constrained
/// (value-semantic) attribute class, `baljsn::DatumEncoderOptions`, that is
/// used to specify options for encoding `Datum` objects in the JSON format (see
/// `baljsn::DatumUtil`).
///
/// ## Attributes {#baljsn_datumencoderoptions-attributes}
///
///
/// @code
/// Name                Type           Default         Simple Constraints
/// ------------------  -----------    -------         ------------------
/// strictTypes         bool           false           none
/// encodingStyle       EncodingStyle  e_COMPACT       none
/// encodeQuotedDecimal64
///                     bool           true            none
/// initialIndentLevel  int            0               >= 0
/// spacesPerLevel      int            0               >= 0
/// @endcode
/// * `strictTypes`: whether type-checking is performed to make sure encoded
///   types conform to the strict set of types that JSON can represent (and can
///   thus be decoded back to the same types of `Datum` values) ([`string`,
///   `double`, `bool`, `null`, `array`, `map`]).
/// * `encodingStyle`: encoding style used to encode the JSON data.
/// * `encodeQuotedDecimal64`: option specifying a way to encode `Decimal64`
///                            values.  If the `encodeQuotedDecimal64`
///                            attribute in the `DatumEncoderOptions` is `true`
///                            (the default), the `Decimal64` values will be
///                            encoded as strings, otherwise they will be
///                            encoded as numbers. Encoding a Decimal64 as a
///                            JSON numbers will frequently result it being
///                            later decoded as binary floating point number,
///                            and in the process losing digits of precision
///                            that were the point of using the Decimal64 type
///                            in the first place.  Care should be taken when
///                            setting this option to `false` (though it may be
///                            useful when communicating with endpoints that
///                            are known to correctly handle high precision
///                            JSON numbers).
/// * `initialIndentLevel`: Initial indent level for the topmost element.
/// * `spacesPerLevel`: spaces per additional indent level.
///
/// ## Usage {#baljsn_datumencoderoptions-usage}
///
///
/// This section illustrates intended use of this component.
///
/// ### Example 1: Creating and Populating an Options Object {#baljsn_datumencoderoptions-example-1-creating-and-populating-an-options-object}
///
///
/// This component is designed to be used at a higher level to set the options
/// for encoding `Datum` objects in the JSON format.  This example shows how to
/// create and populate an options object.
///
/// First, we default-construct a `baljsn::DatumEncoderOptions` object:
/// @code
/// const bool STRICT_TYPES             = true;
/// const int  INITIAL_INDENT_LEVEL     = 1;
/// const int  SPACES_PER_LEVEL         = 4;
/// const bool ENCODE_QUOTED_DECIMAL64  = false;
///
/// baljsn::DatumEncoderOptions options;
/// assert(false == options.strictTypes());
/// assert(0     == options.initialIndentLevel());
/// assert(0     == options.spacesPerLevel());
/// assert(baljsn::EncodingStyle::e_COMPACT == options.encodingStyle());
/// assert(true  == options.encodeQuotedDecimal64());
/// @endcode
/// Next, we populate that object to check strict types and encode in a pretty
/// format using a pre-defined initial indent level and spaces per level:
/// @code
/// options.setStrictTypes(STRICT_TYPES);
/// assert(true == options.strictTypes());
///
/// options.setEncodingStyle(baljsn::EncodingStyle::e_PRETTY);
/// assert(baljsn::EncodingStyle::e_PRETTY == options.encodingStyle());
///
/// options.setEncodeQuotedDecimal64(ENCODE_QUOTED_DECIMAL64);
/// ASSERT(ENCODE_QUOTED_DECIMAL64 == options.encodeQuotedDecimal64());
///
/// options.setInitialIndentLevel(INITIAL_INDENT_LEVEL);
/// assert(INITIAL_INDENT_LEVEL == options.initialIndentLevel());
///
/// options.setSpacesPerLevel(SPACES_PER_LEVEL);
/// assert(SPACES_PER_LEVEL == options.spacesPerLevel());
/// @endcode
/// @}
/** @} */
/** @} */
 
/** @addtogroup bal
 * @{
 */
/** @addtogroup baljsn
 * @{
 */
/** @addtogroup baljsn_datumencoderoptions
 * @{
 */
 
#include <balscm_version.h>
 
#include <baljsn_encodingstyle.h>
 
#include <bslalg_typetraits.h>
 
#include <bsl_limits.h>
#include <bsl_iosfwd.h>
 
#include <bsls_assert.h>
#include <bsls_objectbuffer.h>
#include <bsls_review.h>
 
 
 
namespace baljsn { class DatumEncoderOptions; }
namespace baljsn {
 
                         // =========================
                         // class DatumEncoderOptions
                         // =========================
 
/// This simply constrained (value-semantic) attribute class specifies
/// options for encoding `Datum` objects in the JSON format.  See the
/// @ref baljsn_datumencoderoptions-attributes  section for information on the class attributes.  
/// 
/// \note Note that   the class invariants are identically the constraints on the individual
/// attributes.
///
/// See @ref baljsn_datumencoderoptions 
class DatumEncoderOptions {
 
    // INSTANCE DATA
 
    // whether strict type validation is performed
    bool                          d_strictTypes;
 
    // option specifying a way to encode `Decimal64` values.  If the option
    // value is `true` then the `Decimal64` value is encoded quoted
    // { "dec": "1.2e-5" }, and unquoted { "dec": 1.2e-5 } otherwise.
    bool                          d_encodeQuotedDecimal64;
 
    // initial indentation level for the topmost element
    int                           d_initialIndentLevel;
 
    // spaces per additional level of indentation
    int                           d_spacesPerLevel;
 
    // encoding style used to encode values
    baljsn::EncodingStyle::Value  d_encodingStyle;
 
  public:
    // CONSTANTS
    static const bool s_DEFAULT_INITIALIZER_STRICT_TYPES;
 
    static const bool s_DEFAULT_INITIALIZER_ENCODE_QUOTED_DECIMAL64;
 
    static const int  s_DEFAULT_INITIALIZER_INITIAL_INDENT_LEVEL;
 
    static const int  s_DEFAULT_INITIALIZER_SPACES_PER_LEVEL;
 
    static const baljsn::EncodingStyle::Value
                      s_DEFAULT_INITIALIZER_ENCODING_STYLE;
 
  public:
    // CREATORS
 
    /// Create an object of type `DatumEncoderOptions` having the default
    /// value.
    DatumEncoderOptions();
 
    /// Create an object of type `DatumEncoderOptions` having the value of
    /// the specified `original` object.
    DatumEncoderOptions(const DatumEncoderOptions& original);
 
    /// Destroy this object.
    ~DatumEncoderOptions();
 
    // MANIPULATORS
 
    /// Assign to this object the value of the specified `rhs` object.
    DatumEncoderOptions& operator=(const DatumEncoderOptions& rhs);
 
    /// Reset this object to the default value (i.e., its value upon
    /// default construction).
    void reset();
 
    /// Set the "StrictTypes" attribute of this object to the specified
    /// `value`.
    void setStrictTypes(bool value);
 
    /// Set the "InitialIndentLevel" attribute of this object to the specified `value`.  
    /// 
    /// \pre The behavior is undefined   unless `0 <= value`.
    void setInitialIndentLevel(int value);
 
    /// Set the "SpacesPerLevel" attribute of this object to the specified `value`.  
    /// 
    /// \pre The behavior is undefined   unless `0 <= value`.
    void setSpacesPerLevel(int value);
 
    /// Set the "EncodingStyle" attribute of this object to the specified
    /// `value`.
    void setEncodingStyle(baljsn::EncodingStyle::Value value);
 
    /// Set the "EncodeQuotedDecimal64" attribute of this object to the
    /// specified `value`.
    void setEncodeQuotedDecimal64(bool value);
 
    // ACCESSORS
 
    /// Return the "StrictTypes" attribute of this object.
    bool strictTypes() const;
 
    /// Return the "InitialIndentLevel" attribute of this object.
    int initialIndentLevel() const;
 
    /// Return the "SpacesPerLevel" attribute of this object.
    int spacesPerLevel() const;
 
    /// Return the "EncodingStyle" attribute of this object.
    baljsn::EncodingStyle::Value encodingStyle() const;
 
    /// Return the value of the "EncodeQuotedDecimal64" attribute of this
    /// object.
    bool encodeQuotedDecimal64() const;
 
                                  // Aspects
 
    /// Format this object to the specified output `stream` at the
    /// optionally specified indentation `level` and return a reference to
    /// the modifiable `stream`.  If `level` is specified, optionally
    /// specify `spacesPerLevel`, the number of spaces per indentation level
    /// for this and all of its nested objects.  Each line is indented by
    /// the absolute value of `level * spacesPerLevel`.  If `level` is
    /// negative, suppress indentation of the first line.  If
    /// `spacesPerLevel` is negative, suppress line breaks and format the
    /// entire output on one line.  If `stream` is initially invalid, this operation has no effect.  
    /// 
    /// \note Note that   a trailing newline is provided
    /// in multiline mode only.
    bsl::ostream& print(bsl::ostream& stream,
                        int           level = 0,
                        int           spacesPerLevel = 4) const;
};
 
// FREE OPERATORS
 
/// Return `true` if the specified `lhs` and `rhs` attribute objects have
/// the same value, and `false` otherwise.  Two attribute objects have the
/// same value if each respective attribute has the same value.
inline
bool operator==(const DatumEncoderOptions& lhs,
                const DatumEncoderOptions& rhs);
 
/// Return `true` if the specified `lhs` and `rhs` attribute objects do not
/// have the same value, and `false` otherwise.  Two attribute objects do
/// not have the same value if one or more respective attributes differ in
/// values.
inline
bool operator!=(const DatumEncoderOptions& lhs,
                const DatumEncoderOptions& rhs);
 
/// Format the specified `rhs` to the specified output `stream` and return a
/// reference to the modifiable `stream`.
inline
bsl::ostream& operator<<(bsl::ostream& stream, const DatumEncoderOptions& rhs);
 
}  // close package namespace
 
// ============================================================================
//                         INLINE FUNCTION DEFINITIONS
// ============================================================================
 
namespace baljsn {
 
                           // -------------------------
                           // class DatumEncoderOptions
                           // -------------------------
 
inline
void DatumEncoderOptions::setEncodingStyle(baljsn::EncodingStyle::Value value)
{
    d_encodingStyle = value;
}
 
inline
void DatumEncoderOptions::setInitialIndentLevel(int value)
{
    BSLS_ASSERT(0 <= value);
 
    d_initialIndentLevel = value;
}
 
inline
void DatumEncoderOptions::setSpacesPerLevel(int value)
{
    BSLS_ASSERT(0 <= value);
 
    d_spacesPerLevel = value;
}
 
inline
void DatumEncoderOptions::setStrictTypes(bool value)
{
    d_strictTypes = value;
}
 
inline
void DatumEncoderOptions::setEncodeQuotedDecimal64(bool value)
{
    d_encodeQuotedDecimal64 = value;
}
 
// ACCESSORS
inline
baljsn::EncodingStyle::Value DatumEncoderOptions::encodingStyle() const
{
    return static_cast<baljsn::EncodingStyle::Value>(d_encodingStyle);
}
 
inline
int DatumEncoderOptions::initialIndentLevel() const
{
    return d_initialIndentLevel;
}
 
inline
int DatumEncoderOptions::spacesPerLevel() const
{
    return d_spacesPerLevel;
}
 
inline
bool DatumEncoderOptions::strictTypes() const
{
    return d_strictTypes;
}
 
inline
bool DatumEncoderOptions::encodeQuotedDecimal64() const
{
    return d_encodeQuotedDecimal64;
}
 
}  // close package namespace
 
// ============================================================================
//                             INLINE DEFINITIONS
// ============================================================================
 
inline
bool baljsn::operator==(const baljsn::DatumEncoderOptions& lhs,
                        const baljsn::DatumEncoderOptions& rhs)
{
    return  lhs.strictTypes()           == rhs.strictTypes()
         && lhs.initialIndentLevel()    == rhs.initialIndentLevel()
         && lhs.spacesPerLevel()        == rhs.spacesPerLevel()
         && lhs.encodingStyle()         == rhs.encodingStyle()
         && lhs.encodeQuotedDecimal64() == rhs.encodeQuotedDecimal64();
}
 
inline
bool baljsn::operator!=(const baljsn::DatumEncoderOptions& lhs,
                        const baljsn::DatumEncoderOptions& rhs)
{
    return  lhs.strictTypes()           != rhs.strictTypes()
         || lhs.initialIndentLevel()    != rhs.initialIndentLevel()
         || lhs.spacesPerLevel()        != rhs.spacesPerLevel()
         || lhs.encodingStyle()         != rhs.encodingStyle()
         || lhs.encodeQuotedDecimal64() != rhs.encodeQuotedDecimal64();
}
 
inline
bsl::ostream& baljsn::operator<<(bsl::ostream&                      stream,
                                 const baljsn::DatumEncoderOptions& rhs)
{
    return rhs.print(stream, 0, -1);
}
 
 
#endif
 
// ----------------------------------------------------------------------------
// Copyright 2019 Bloomberg Finance L.P.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ----------------------------- END-OF-FILE ----------------------------------
 
/** @} */
/** @} */
/** @} */