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Java wrapper notes

This document describes the Java language binding for the MapGuide API

Usage

Reference MapGuideApi.jar like you would any other java jar library and make sure that the java.library.path of your root Java application contains the path to:

  • MapGuideJavaApi.dll and supporting dlls on Windows
  • libMapGuideJavaApi.so on Linux. The zip package includes distro-specific builds of this library, make sure to use the correct library for your distro. All builds of this library have their RPATH set to /usr/local/mapguideopensource-3.1.1/lib and /usr/local/mapguideopensource-3.1.1/webserverextensions/lib, so any dependent libraries of libMapGuideJavaApi.so will be automatically detected and loaded assuming you have MapGuide Open Source 3.1.1 already installed.

Overview of differences

This wrapper is based on the MapGuideJavaApiEx variant of the official Java binding (original RFC here), and carries most of its changes/differences:

1. Minimum Java version

This binding was built with JDK 7

2. MgException/AppThrowable is no longer a checked exception

AppThrowable now extends RuntimeException making it (and MgException and its subclasses) unchecked exceptions, all methods in the MapGuide API no longer have the (throws MgException) clause.

3. Method names follow Java naming conventions

All method names in the Java proxy classes are now in lowerCamelCase instead of the MapGuide-default UpperCamelCase

eg. Instead of this:

MgSiteConnection siteConn = new MgSiteConnection();
MgUserInformation userInfo = new MgUserInfomration(sessionId);
siteConn.Open(userInfo);
MgFeatureService featureSvc = (MgFeatureService)siteConn.CreateService(MgServiceType.FeatureService);
MgFeatureSchemaCollection schema = featureSvc.DescribeSchema(new MgResourceIdentifier("Library://Samples/Sheboygan/Data/Parcels.FeatureSource"), "SHP_Schema");

It is now this:

MgSiteConnection siteConn = new MgSiteConnection();
MgUserInformation userInfo = new MgUserInfomration(sessionId);
siteConn.open(userInfo); //Note the lowercase
MgFeatureService featureSvc = (MgFeatureService)siteConn.createService(MgServiceType.FeatureService); //Note the lowercase
MgFeatureSchemaCollection schema = featureSvc.describeSchema(new MgResourceIdentifier("Library://Samples/Sheboygan/Data/Parcels.FeatureSource"), "SHP_Schema"); //Note the lowercase

The MgInitializeWebTier entry point also obeys this convention (now named mgInitializeWebTier)

4. java.util.Collection<T> support

The following MapGuide collection classes now implement java.util.Collection<T>:

  • MgBatchPropertyCollection (T is MgPropertyCollection)
  • MgClassDefinitionCollection (T is MgClassDefinition)
  • MgFeatureSchemaCollection (T is MgFeatureSchema)
  • MgPropertyCollection (T is MgProperty)
  • MgStringCollection (T is String)

5. java.util.Iterable<T> support

The following classes now implement java.util.Iterable<T> allowing them to be used in an enhanced for-loop

  • MgReadOnlyLayerCollection (T is MgLayerBase)

Having java.util.Iterable<T> means that such instances can be be looped using the enhanced for loop like so:

MgReadOnlyLayerCollection readOnlyLayers = ...;
for (MgLayerBase layer : readOnlyLayers) {
    ...
}

As java.util.Collection<T> inherits from java.util.Iterable<T>, such implementing classes can be used with the enhanced for loop as well.

6. Renamed methods

To avoid naming conflicts with SWIG generated code and methods from inherited java classes or interfaces as a result of the above changes, the following class methods have been renamed in the Java MapGuide API:

  • MgException.GetStackTrace is now MgException.getExceptionStackTrace
  • MgBatchPropertyCollection.Add is now MgBatchPropertyCollection.addItem
  • MgClassDefinitionCollection.Add is now MgClassDefinitionCollection.addItem
  • MgFeatureSchemaCollection.Add is now MgFeatureSchemaCollection.addItem
  • MgIntCollection.Add is now MgIntCollection.addItem
  • MgPropertyCollection.Add is now MgPropertyCollection.addItem
  • MgStringCollection.Add is now MgStringCollection.addItem

7. The following classes implement java.lang.AutoCloseable and can be used with try-with-resources statements:

  • MgReader
  • MgFeatureReader
  • MgDataReader
  • MgSqlDataReader
  • MgLongTransactionReader
  • MgSpatialContextReader

8. Tightened encapsulation

The SWIG-generated constructor for every proxy class is no longer public. This constructor was always reserved for use by SWIG.