qgswmsprovider.cpp

一个非常好的GIS开源新版本

  {
    capability = (capability | QgsRasterDataProvider::Identify);
  }

  QgsDebugMsg("exiting with '"  + QString(capability)  + "'.");

  return capability;
}


QString QgsWmsProvider::getMetadata()
{

  QString myMetadataQString = "";

  // Server Properties section
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Server Properties:");
  myMetadataQString += "</td></tr>";

  // Use a nested table
  myMetadataQString += "<tr><td bgcolor=\"white\">";
  myMetadataQString += "<table width=\"100%\">";

  // Table header
  myMetadataQString += "<tr><th bgcolor=\"black\">";
  myMetadataQString += "<font color=\"white\">" + tr("Property") + "</font>";
  myMetadataQString += "</th>";
  myMetadataQString += "<th bgcolor=\"black\">";
  myMetadataQString += "<font color=\"white\">" + tr("Value") + "</font>";
  myMetadataQString += "</th><tr>";

  // WMS Version
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("WMS Version");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += mCapabilities.version;
  myMetadataQString += "</td></tr>";

  // Service Title
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Title");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += mCapabilities.service.title;
  myMetadataQString += "</td></tr>";

  // Service Abstract
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Abstract");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += mCapabilities.service.abstract;
  myMetadataQString += "</td></tr>";

  // Service Keywords
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Keywords");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += mCapabilities.service.keywordList.join("<br />");
  myMetadataQString += "</td></tr>";

  // Service Online Resource
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Online Resource");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += "-";
  myMetadataQString += "</td></tr>";

  // Service Contact Information
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Contact Person");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += mCapabilities.service.contactInformation.contactPersonPrimary.contactPerson;
  myMetadataQString += "<br />";
  myMetadataQString += mCapabilities.service.contactInformation.contactPosition;
  myMetadataQString += "<br />";
  myMetadataQString += mCapabilities.service.contactInformation.contactPersonPrimary.contactOrganization;
  myMetadataQString += "</td></tr>";

  // Service Fees
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Fees");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += mCapabilities.service.fees;
  myMetadataQString += "</td></tr>";

  // Service Access Constraints
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Access Constraints");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += mCapabilities.service.accessConstraints;
  myMetadataQString += "</td></tr>";

  // GetMap Request Formats
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Image Formats");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += mCapabilities.capability.request.getMap.format.join("<br />");
  myMetadataQString += "</td></tr>";

  // GetFeatureInfo Request Formats
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Identify Formats");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += mCapabilities.capability.request.getFeatureInfo.format.join("<br />");
  myMetadataQString += "</td></tr>";

  // Layer Count (as managed by this provider)
  myMetadataQString += "<tr><td bgcolor=\"gray\">";
  myMetadataQString += tr("Layer Count");
  myMetadataQString += "</td>";
  myMetadataQString += "<td bgcolor=\"gray\">";
  myMetadataQString += QString::number( layersSupported.size() );
  myMetadataQString += "</td></tr>";

  // Close the nested table
  myMetadataQString += "</table>";
  myMetadataQString += "</td></tr>";

  // Iterate through layers

  for (uint i = 0; i < layersSupported.size(); i++)
  {

    // TODO: Handle nested layers
    QString layerName = layersSupported[i].name;   // for aesthetic convenience

    // Layer Properties section
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Layer Properties: ");
    myMetadataQString += layerName;
    myMetadataQString += "</td></tr>";
  
    // Use a nested table
    myMetadataQString += "<tr><td bgcolor=\"white\">";
    myMetadataQString += "<table width=\"100%\">";
  
    // Table header
    myMetadataQString += "<tr><th bgcolor=\"black\">";
    myMetadataQString += "<font color=\"white\">" + tr("Property") + "</font>";
    myMetadataQString += "</th>";
    myMetadataQString += "<th bgcolor=\"black\">";
    myMetadataQString += "<font color=\"white\">" + tr("Value") + "</font>";
    myMetadataQString += "</th><tr>";
  
    // Layer Selectivity (as managed by this provider)
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Selected");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += (activeSubLayers.findIndex(layerName) >= 0) ?
                           tr("Yes") : tr("No");
    myMetadataQString += "</td></tr>";
  
    // Layer Visibility (as managed by this provider)
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Visibility");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += (activeSubLayers.findIndex(layerName) >= 0) ?
                           (
                            (activeSubLayerVisibility.find(layerName)->second) ?
                            tr("Visible") : tr("Hidden")
                           ) :
                           tr("n/a");
    myMetadataQString += "</td></tr>";
  
    // Layer Title
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Title");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += layersSupported[i].title;
    myMetadataQString += "</td></tr>";
  
    // Layer Abstract
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Abstract");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += layersSupported[i].abstract;
    myMetadataQString += "</td></tr>";
  
    // Layer Queryability
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Can Identify");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += ((layersSupported[i].queryable) ? tr("Yes") : tr("No"));
    myMetadataQString += "</td></tr>";

    // Layer Opacity
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Can be Transparent");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += ((layersSupported[i].opaque) ? tr("No") : tr("Yes"));
    myMetadataQString += "</td></tr>";

    // Layer Subsetability
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Can Zoom In");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += ((layersSupported[i].noSubsets) ? tr("No") : tr("Yes"));
    myMetadataQString += "</td></tr>";

    // Layer Server Cascade Count
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Cascade Count");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += layersSupported[i].cascaded;
    myMetadataQString += "</td></tr>";

    // Layer Fixed Width
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Fixed Width");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += layersSupported[i].fixedWidth;
    myMetadataQString += "</td></tr>";

    // Layer Fixed Height
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("Fixed Height");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += layersSupported[i].fixedHeight;
    myMetadataQString += "</td></tr>";

    // Layer Fixed Height
    myMetadataQString += "<tr><td bgcolor=\"gray\">";
    myMetadataQString += tr("WGS 84 Bounding Box");
    myMetadataQString += "</td>";
    myMetadataQString += "<td bgcolor=\"gray\">";
    myMetadataQString += extentForLayer[ layerName ].stringRep().toLocal8Bit().data();
    myMetadataQString += "</td></tr>";

    // Layer Coordinate Reference Systems
    for ( uint j = 0; j < layersSupported[i].crs.size(); j++ )
    {
      myMetadataQString += "<tr><td bgcolor=\"gray\">";
      myMetadataQString += tr("Available in CRS");
      myMetadataQString += "</td>";
      myMetadataQString += "<td bgcolor=\"gray\">";
      myMetadataQString += layersSupported[i].crs[j];
      myMetadataQString += "</td></tr>";
    }

    // Layer Styles
    for (uint j = 0; j < layersSupported[i].style.size(); j++)
    {
      myMetadataQString += "<tr><td bgcolor=\"gray\">";
      myMetadataQString += tr("Available in style");
      myMetadataQString += "</td>";
      myMetadataQString += "<td>";

      // Nested table.
      myMetadataQString += "<table width=\"100%\">";

      // Layer Style Name
      myMetadataQString += "<tr><td bgcolor=\"gray\">";
      myMetadataQString += tr("Name");
      myMetadataQString += "</td>";
      myMetadataQString += "<td bgcolor=\"gray\">";
      myMetadataQString += layersSupported[i].style[j].name;
      myMetadataQString += "</td></tr>";

      // Layer Style Title
      myMetadataQString += "<tr><td bgcolor=\"gray\">";
      myMetadataQString += tr("Title");
      myMetadataQString += "</td>";
      myMetadataQString += "<td bgcolor=\"gray\">";
      myMetadataQString += layersSupported[i].style[j].title;
      myMetadataQString += "</td></tr>";

      // Layer Style Abstract
      myMetadataQString += "<tr><td bgcolor=\"gray\">";
      myMetadataQString += tr("Abstract");
      myMetadataQString += "</td>";
      myMetadataQString += "<td bgcolor=\"gray\">";
      myMetadataQString += layersSupported[i].style[j].abstract;
      myMetadataQString += "</td></tr>";

      // Close the nested table
      myMetadataQString += "</table>";
      myMetadataQString += "</td></tr>";
    }

    // Close the nested table
    myMetadataQString += "</table>";
    myMetadataQString += "</td></tr>";

  } // for each layer

  QgsDebugMsg("exiting with '"  + myMetadataQString  + "'.");

  return myMetadataQString;
}


QString QgsWmsProvider::identifyAsText(const QgsPoint& point)
{

  QgsDebugMsg("Entering.");

  // Collect which layers to query on

  QStringList queryableLayers = QStringList();
  QString text = "";;

  // Test for which layers are suitable for querying with
  for ( QStringList::const_iterator it  = activeSubLayers.begin(); 
                                    it != activeSubLayers.end(); 
                                  ++it )
  {
    // Is sublayer visible?
    if (TRUE == activeSubLayerVisibility.find( *it )->second)
    {
      // Is sublayer queryable?
      if (TRUE == mQueryableForLayer.find( *it )->second)
      {
        QgsDebugMsg("Layer '" + *it + "' is queryable.");
        // Compose request to WMS server

        QString requestUrl = mGetFeatureInfoUrlBase;
        QString layer = QUrl::toPercentEncoding(*it);

        requestUrl += "&";
        requestUrl += "QUERY_LAYERS=" + layer ;
        requestUrl += "&";
        //! \todo Need to tie this into the options provided by GetCapabilities
        requestUrl += "INFO_FORMAT=text/plain";


// X,Y in WMS 1.1.1; I,J in WMS 1.3.0

//   requestUrl += "&";
//   requestUrl += QString( "I=%1" )
//                    .arg( point.x() );
//   requestUrl += "&";
//   requestUrl += QString( "J=%1" )
//                    .arg( point.y() );

        requestUrl += "&";
        requestUrl += QString( "X=%1" )
          .arg( point.x() );
        requestUrl += "&";
        requestUrl += QString( "Y=%1" )
          .arg( point.y() );

        text += "---------------\n" + retrieveUrl(requestUrl);
      }
    }
  }


  if (text.isEmpty())
  {
    // No layers were queryably. This can happen if identify tool was
    // active when this non-queriable layer was selected.
    // Return a descriptive text.

    text = tr("Layer cannot be queried.");
  }

  QgsDebugMsg("Exiting with: " + text);
  return text;
}


QgsSpatialRefSys QgsWmsProvider::getSRS()
{
  // TODO: implement
  return QgsSpatialRefSys();
}


QString QgsWmsProvider::errorCaptionString()
{
  return mErrorCaption;
}


QString QgsWmsProvider::errorString()
{
  QgsDebugMsg("returning '" + mError  + "'.");
  return mError;
}


QString  QgsWmsProvider::name() const
{
    return WMS_KEY;
} //  QgsWmsProvider::name()



QString  QgsWmsProvider::description() const
{
    return WMS_DESCRIPTION;
} //  QgsWmsProvider::description()




   
/**
 * Class factory to return a pointer to a newly created 
 * QgsWmsProvider object
 */
QGISEXTERN QgsWmsProvider * classFactory(const QString *uri)
{
  return new QgsWmsProvider(*uri);
}
/** Required key function (used to map the plugin to a data store type)
*/
QGISEXTERN QString providerKey(){
  return WMS_KEY;
}
/**
 * Required description function 
 */
QGISEXTERN QString description()
{
    return WMS_DESCRIPTION;
} 
/**
 * Required isProvider function. Used to determine if this shared library
 * is a data provider plugin
 */
QGISEXTERN bool isProvider(){
  return true;
}