Hi,I want to add an index to a feature class. To do so, I use the very short and complete example given there:http://resources.esri.com/help/9.3/arcgisengine/java/doc/b22267cb-642c-11dc-9ca3-0b35f906bb2e.htmWhen I use this code, I obtain an exception due to a Castproblem: It cannot cast from a IFeatureClass to a ISchemaLock:Exception in thread "main" java.lang.ClassCastException: com.esri.arcgis.geodatabase.IFeatureClassProxy cannot be cast to com.esri.arcgis.geodatabase.ISchemaLockAre you able to run this code sucessfully ?You have to change the 2 first inputs in the code (the path and name of your shapefile)
import java.io.IOException;
import com.esri.arcgis.system.AoInitialize;
import com.esri.arcgis.system.EngineInitializer;
import com.esri.arcgis.system.esriLicenseProductCode;
import com.esri.arcgis.system.esriLicenseStatus;
import com.esri.arcgis.datasourcesfile.ShapefileWorkspaceFactory;
import com.esri.arcgis.geodatabase.Fields;
import com.esri.arcgis.geodatabase.IFeatureClass;
import com.esri.arcgis.geodatabase.IFeatureWorkspace;
import com.esri.arcgis.geodatabase.IField;
import com.esri.arcgis.geodatabase.IFields;
import com.esri.arcgis.geodatabase.IFieldsEdit;
import com.esri.arcgis.geodatabase.IIndex;
import com.esri.arcgis.geodatabase.IIndexEdit;
import com.esri.arcgis.geodatabase.ISchemaLock;
import com.esri.arcgis.geodatabase.IWorkspace;
import com.esri.arcgis.geodatabase.IWorkspaceFactory;
import com.esri.arcgis.geodatabase.Index;
import com.esri.arcgis.geodatabase.esriSchemaLock;
public class classmain
{
public static void main(String[] args)
{
try
{
// >>> Enter here the path and the name of your shapefile.
String folderPath = "D:\\ShapeFolder\\test";
String shapefileName = "myShape_022";
// Step 1: Initialize the Java Component Object Model (COM) Interop.
EngineInitializer.initializeEngine();
// Step 2: Initialize an ArcGIS license.
AoInitialize aoInit = new AoInitialize();
aoInit.initialize(esriLicenseProductCode.esriLicenseProductCodeAdvanced);
// Load the ShapeFile into "featureClass"
IWorkspaceFactory workspaceFactory = new ShapefileWorkspaceFactory();
IWorkspace workspace = workspaceFactory.openFromFile(folderPath, 0);
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspace;
IFeatureClass featureClass = featureWorkspace.openFeatureClass(shapefileName);;
// Find the field "FID" in featureClass that will be used as an index
int fieldIndex = featureClass.findField("FID");
// Get the specified field from the feature class.
IFields featureClassFields = featureClass.getFields();
IField field = featureClassFields.getField(fieldIndex);
// Create a new fields collection and add the specified field to it.
IFields fields = new Fields();
IFieldsEdit fieldsEdit = (IFieldsEdit)fields;
fieldsEdit.setFieldCount(1);
fieldsEdit.setFieldByRef(0, field);
//Create a new index and cast to the IIndexEdit interface.
IIndex index = new Index();
IIndexEdit indexEdit = (IIndexEdit)index;
// Set the index's properties, including the fields it will have associated with it.
indexEdit.setFieldsByRef(fields);
indexEdit.setIsAscending(false);
indexEdit.setIsUnique(false);
indexEdit.setName("IndexFID");
//Attempt to acquire an exclusive schema lock on the feature class.
ISchemaLock schemaLock = (ISchemaLock)featureClass;
schemaLock.changeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);
featureClass.addIndex(index);
schemaLock.changeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
// Disconnect licences
aoInit.shutdown();
}
catch (IOException ex)
{
System.out.println(ex.getMessage());
System.out.println("App failed.");
}
} //End of method main.
} //End of class:EngineHelloWorld.
