add an INDEX to an IFeatureClass with ARCGIS Java sdk

[المشرف العام]

I want to add an index to a feature class. To do so, I used the very short and complete example given there:http://resources.esri.com/help/9.3/arcgisengine/java/doc/b22267cb-642c-11dc-9ca3-0b35f906bb2e.htm

My modified code is below. When I use that code, I obtain an exception due to a Cast problem; 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.ISchemaLock

Are you able to run this code sucessfully without the error ?

If you want to run this code, you have to change the 2 first string 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."); }} }

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