Merge pull request #1547 from rouault/json_export

Add CRS JSON export (refs #1545)

1 files changed, 313 insertions, 4 deletions

diff --git a/src/iso19111/datum.cpp b/src/iso19111/datum.cpp
index bf3092c1..65905ca9 100644
--- a/src/iso19111/datum.cpp
+++ b/src/iso19111/datum.cpp
@@ -93,6 +93,9 @@ struct Datum::Private {
 
     // cppcheck-suppress functionStatic
     void exportAnchorDefinition(io::WKTFormatter *formatter) const;
+
+    // cppcheck-suppress functionStatic
+    void exportAnchorDefinition(io::JSONFormatter *formatter) const;
 };
 
 // ---------------------------------------------------------------------------
@@ -105,6 +108,17 @@ void Datum::Private::exportAnchorDefinition(io::WKTFormatter *formatter) const {
     }
 }
 
+// ---------------------------------------------------------------------------
+
+void Datum::Private::exportAnchorDefinition(
+    io::JSONFormatter *formatter) const {
+    if (anchorDefinition) {
+        auto &writer = formatter->writer();
+        writer.AddObjKey("anchor");
+        writer.Add(*anchorDefinition);
+    }
+}
+
 //! @endcond
 
 // ---------------------------------------------------------------------------
@@ -348,6 +362,40 @@ void PrimeMeridian::_exportToWKT(
 // ---------------------------------------------------------------------------
 
 //! @cond Doxygen_Suppress
+void PrimeMeridian::_exportToJSON(
+    io::JSONFormatter *formatter) const // throw(FormattingException)
+{
+    auto &writer = formatter->writer();
+    auto objectContext(
+        formatter->MakeObjectContext("PrimeMeridian", !identifiers().empty()));
+
+    writer.AddObjKey("name");
+    std::string l_name =
+        name()->description().has_value() ? nameStr() : "Greenwich";
+    writer.Add(l_name);
+
+    const auto &l_long = longitude();
+    writer.AddObjKey("longitude");
+    const auto &unit = l_long.unit();
+    if (unit == common::UnitOfMeasure::DEGREE) {
+        writer.Add(l_long.value(), 15);
+    } else {
+        auto longitudeContext(formatter->MakeObjectContext(nullptr, false));
+        writer.AddObjKey("value");
+        writer.Add(l_long.value(), 15);
+        writer.AddObjKey("unit");
+        unit._exportToJSON(formatter);
+    }
+
+    if (formatter->outputId()) {
+        formatID(formatter);
+    }
+}
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
 std::string
 PrimeMeridian::getPROJStringWellKnownName(const common::Angle &angle) {
     const double valRad = angle.getSIValue();
@@ -768,6 +816,66 @@ void Ellipsoid::_exportToWKT(
 
 // ---------------------------------------------------------------------------
 
+//! @cond Doxygen_Suppress
+void Ellipsoid::_exportToJSON(
+    io::JSONFormatter *formatter) const // throw(FormattingException)
+{
+    auto &writer = formatter->writer();
+    auto objectContext(
+        formatter->MakeObjectContext("Ellipsoid", !identifiers().empty()));
+
+    writer.AddObjKey("name");
+    auto l_name = nameStr();
+    if (l_name.empty()) {
+        writer.Add("unnamed");
+    } else {
+        writer.Add(l_name);
+    }
+
+    const auto &semiMajor = semiMajorAxis();
+    const auto &semiMajorUnit = semiMajor.unit();
+    writer.AddObjKey(isSphere() ? "radius" : "semi_major_axis");
+    if (semiMajorUnit == common::UnitOfMeasure::METRE) {
+        writer.Add(semiMajor.value(), 15);
+    } else {
+        auto objContext(formatter->MakeObjectContext(nullptr, false));
+        writer.AddObjKey("value");
+        writer.Add(semiMajor.value(), 15);
+
+        writer.AddObjKey("unit");
+        semiMajorUnit._exportToJSON(formatter);
+    }
+
+    if (!isSphere()) {
+        const auto &l_inverseFlattening = inverseFlattening();
+        if (l_inverseFlattening.has_value()) {
+            writer.AddObjKey("inverse_flattening");
+            writer.Add(l_inverseFlattening->getSIValue(), 15);
+        } else {
+            writer.AddObjKey("semi_minor_axis");
+            const auto &l_semiMinorAxis(semiMinorAxis());
+            const auto &semiMinorAxisUnit(l_semiMinorAxis->unit());
+            if (semiMinorAxisUnit == common::UnitOfMeasure::METRE) {
+                writer.Add(l_semiMinorAxis->value(), 15);
+            } else {
+                auto objContext(formatter->MakeObjectContext(nullptr, false));
+                writer.AddObjKey("value");
+                writer.Add(l_semiMinorAxis->value(), 15);
+
+                writer.AddObjKey("unit");
+                semiMinorAxisUnit._exportToJSON(formatter);
+            }
+        }
+    }
+
+    if (formatter->outputId()) {
+        formatID(formatter);
+    }
+}
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
 bool Ellipsoid::lookForProjWellKnownEllps(std::string &projEllpsName,
                                           std::string &ellpsName) const {
     const double a = semiMajorAxis().getSIValue();
@@ -1153,6 +1261,55 @@ void GeodeticReferenceFrame::_exportToWKT(
 // ---------------------------------------------------------------------------
 
 //! @cond Doxygen_Suppress
+void GeodeticReferenceFrame::_exportToJSON(
+    io::JSONFormatter *formatter) const // throw(FormattingException)
+{
+    auto dynamicGRF = dynamic_cast<const DynamicGeodeticReferenceFrame *>(this);
+
+    auto objectContext(formatter->MakeObjectContext(
+        dynamicGRF ? "DynamicGeodeticReferenceFrame" : "GeodeticReferenceFrame",
+        !identifiers().empty()));
+    auto &writer = formatter->writer();
+
+    writer.AddObjKey("name");
+    auto l_name = nameStr();
+    if (l_name.empty()) {
+        writer.Add("unnamed");
+    } else {
+        writer.Add(l_name);
+    }
+
+    Datum::getPrivate()->exportAnchorDefinition(formatter);
+
+    if (dynamicGRF) {
+        writer.AddObjKey("frame_reference_epoch");
+        writer.Add(dynamicGRF->frameReferenceEpoch().value());
+
+        const auto &deformationModel = dynamicGRF->deformationModelName();
+        if (deformationModel.has_value()) {
+            writer.AddObjKey("deformation_model");
+            writer.Add(*deformationModel);
+        }
+    }
+
+    writer.AddObjKey("ellipsoid");
+    formatter->setOmitTypeInImmediateChild();
+    ellipsoid()->_exportToJSON(formatter);
+
+    const auto &l_primeMeridian(primeMeridian());
+    if (l_primeMeridian->nameStr() != "Greenwich") {
+        writer.AddObjKey("prime_meridian");
+        formatter->setOmitTypeInImmediateChild();
+        primeMeridian()->_exportToJSON(formatter);
+    }
+
+    ObjectUsage::baseExportToJSON(formatter);
+}
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
 bool GeodeticReferenceFrame::_isEquivalentTo(
     const util::IComparable *other,
     util::IComparable::Criterion criterion) const {
@@ -1279,7 +1436,7 @@ void DynamicGeodeticReferenceFrame::_exportToWKT(
 
 // ---------------------------------------------------------------------------
 
-/** \brief Instantiate a DyanmicGeodeticReferenceFrame
+/** \brief Instantiate a DynamicGeodeticReferenceFrame
  *
  * @param properties See \ref general_properties.
  * At minimum the name should be defined.
@@ -1288,7 +1445,7 @@ void DynamicGeodeticReferenceFrame::_exportToWKT(
  * @param primeMeridian the PrimeMeridian.
  * @param frameReferenceEpochIn the frame reference epoch.
  * @param deformationModelNameIn deformation model name, or empty
- * @return new DyanmicGeodeticReferenceFrame.
+ * @return new DynamicGeodeticReferenceFrame.
  */
 DynamicGeodeticReferenceFrameNNPtr DynamicGeodeticReferenceFrame::create(
     const util::PropertyMap &properties, const EllipsoidNNPtr &ellipsoid,
@@ -1419,6 +1576,56 @@ void DatumEnsemble::_exportToWKT(
 
 // ---------------------------------------------------------------------------
 
+//! @cond Doxygen_Suppress
+void DatumEnsemble::_exportToJSON(
+    io::JSONFormatter *formatter) const // throw(FormattingException)
+{
+    auto objectContext(
+        formatter->MakeObjectContext("DatumEnsemble", !identifiers().empty()));
+    auto &writer = formatter->writer();
+
+    writer.AddObjKey("name");
+    auto l_name = nameStr();
+    if (l_name.empty()) {
+        writer.Add("unnamed");
+    } else {
+        writer.Add(l_name);
+    }
+
+    auto l_datums = datums();
+    writer.AddObjKey("members");
+    {
+        auto membersContext(writer.MakeArrayContext(false));
+        for (const auto &datum : l_datums) {
+            auto memberContext(writer.MakeObjectContext());
+            writer.AddObjKey("name");
+            const auto &l_datum_name = datum->nameStr();
+            if (!l_datum_name.empty()) {
+                writer.Add(l_datum_name);
+            } else {
+                writer.Add("unnamed");
+            }
+            datum->formatID(formatter);
+        }
+    }
+
+    auto grfFirst = std::dynamic_pointer_cast<GeodeticReferenceFrame>(
+        l_datums[0].as_nullable());
+    if (grfFirst) {
+        writer.AddObjKey("ellipsoid");
+        formatter->setOmitTypeInImmediateChild();
+        grfFirst->ellipsoid()->_exportToJSON(formatter);
+    }
+
+    writer.AddObjKey("accuracy");
+    writer.Add(positionalAccuracy()->value());
+
+    formatID(formatter);
+}
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
 /** \brief Instantiate a DatumEnsemble.
  *
  * @param properties See \ref general_properties.
@@ -1583,6 +1790,44 @@ void VerticalReferenceFrame::_exportToWKT(
 // ---------------------------------------------------------------------------
 
 //! @cond Doxygen_Suppress
+void VerticalReferenceFrame::_exportToJSON(
+    io::JSONFormatter *formatter) const // throw(FormattingException)
+{
+    auto dynamicGRF = dynamic_cast<const DynamicVerticalReferenceFrame *>(this);
+
+    auto objectContext(formatter->MakeObjectContext(
+        dynamicGRF ? "DynamicVerticalReferenceFrame" : "VerticalReferenceFrame",
+        !identifiers().empty()));
+    auto &writer = formatter->writer();
+
+    writer.AddObjKey("name");
+    auto l_name = nameStr();
+    if (l_name.empty()) {
+        writer.Add("unnamed");
+    } else {
+        writer.Add(l_name);
+    }
+
+    Datum::getPrivate()->exportAnchorDefinition(formatter);
+
+    if (dynamicGRF) {
+        writer.AddObjKey("frame_reference_epoch");
+        writer.Add(dynamicGRF->frameReferenceEpoch().value());
+
+        const auto &deformationModel = dynamicGRF->deformationModelName();
+        if (deformationModel.has_value()) {
+            writer.AddObjKey("deformation_model");
+            writer.Add(*deformationModel);
+        }
+    }
+
+    ObjectUsage::baseExportToJSON(formatter);
+}
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
 bool VerticalReferenceFrame::_isEquivalentTo(
     const util::IComparable *other,
     util::IComparable::Criterion criterion) const {
@@ -1715,7 +1960,7 @@ void DynamicVerticalReferenceFrame::_exportToWKT(
 
 // ---------------------------------------------------------------------------
 
-/** \brief Instantiate a DyanmicVerticalReferenceFrame
+/** \brief Instantiate a DynamicVerticalReferenceFrame
  *
  * @param properties See \ref general_properties.
  * At minimum the name should be defined.
@@ -1723,7 +1968,7 @@ void DynamicVerticalReferenceFrame::_exportToWKT(
  * @param realizationMethodIn the realization method, or empty.
  * @param frameReferenceEpochIn the frame reference epoch.
  * @param deformationModelNameIn deformation model name, or empty
- * @return new DyanmicVerticalReferenceFrame.
+ * @return new DynamicVerticalReferenceFrame.
  */
 DynamicVerticalReferenceFrameNNPtr DynamicVerticalReferenceFrame::create(
     const util::PropertyMap &properties,
@@ -1846,6 +2091,32 @@ void TemporalDatum::_exportToWKT(
 // ---------------------------------------------------------------------------
 
 //! @cond Doxygen_Suppress
+void TemporalDatum::_exportToJSON(
+    io::JSONFormatter *formatter) const // throw(FormattingException)
+{
+    auto objectContext(
+        formatter->MakeObjectContext("TemporalDatum", !identifiers().empty()));
+    auto &writer = formatter->writer();
+
+    writer.AddObjKey("name");
+    writer.Add(nameStr());
+
+    writer.AddObjKey("calendar");
+    writer.Add(calendar());
+
+    const auto &timeOriginStr = temporalOrigin().toString();
+    if (!timeOriginStr.empty()) {
+        writer.AddObjKey("time_origin");
+        writer.Add(timeOriginStr);
+    }
+
+    ObjectUsage::baseExportToJSON(formatter);
+}
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
 bool TemporalDatum::_isEquivalentTo(
     const util::IComparable *other,
     util::IComparable::Criterion criterion) const {
@@ -1919,6 +2190,25 @@ void EngineeringDatum::_exportToWKT(
 // ---------------------------------------------------------------------------
 
 //! @cond Doxygen_Suppress
+void EngineeringDatum::_exportToJSON(
+    io::JSONFormatter *formatter) const // throw(FormattingException)
+{
+    auto objectContext(formatter->MakeObjectContext("EngineeringDatum",
+                                                    !identifiers().empty()));
+    auto &writer = formatter->writer();
+
+    writer.AddObjKey("name");
+    writer.Add(nameStr());
+
+    Datum::getPrivate()->exportAnchorDefinition(formatter);
+
+    ObjectUsage::baseExportToJSON(formatter);
+}
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
 bool EngineeringDatum::_isEquivalentTo(
     const util::IComparable *other,
     util::IComparable::Criterion criterion) const {
@@ -1985,6 +2275,25 @@ void ParametricDatum::_exportToWKT(
 // ---------------------------------------------------------------------------
 
 //! @cond Doxygen_Suppress
+void ParametricDatum::_exportToJSON(
+    io::JSONFormatter *formatter) const // throw(FormattingException)
+{
+    auto objectContext(formatter->MakeObjectContext("ParametricDatum",
+                                                    !identifiers().empty()));
+    auto &writer = formatter->writer();
+
+    writer.AddObjKey("name");
+    writer.Add(nameStr());
+
+    Datum::getPrivate()->exportAnchorDefinition(formatter);
+
+    ObjectUsage::baseExportToJSON(formatter);
+}
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
 bool ParametricDatum::_isEquivalentTo(
     const util::IComparable *other,
     util::IComparable::Criterion criterion) const {