/* Copyright (c) 2012-2014 Boundless and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Distribution License v1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/org/documents/edl-v10.html
*
* Contributors:
* Johnathan Garrett (LMN Solutions) - initial implementation
*/
package org.locationtech.geogig.geotools.plumbing;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.geotools.data.DataStore;
import org.geotools.data.simple.SimpleFeatureSource;
import org.locationtech.geogig.api.AbstractGeoGigOp;
import org.locationtech.geogig.geotools.plumbing.GeoToolsOpException.StatusCode;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.Name;
import org.opengis.feature.type.PropertyDescriptor;
import com.google.common.base.Optional;
/**
* Internal operation for describing a table from a GeoTools {@link DataStore}.
*
* @see DataStore
*/
public class DescribeOp extends AbstractGeoGigOp<Optional<Map<String, String>>> {
private String table = null;
private DataStore dataStore;
/**
* Describes a table from the data store that has been assigned.
*
* @return a map that contains all properties and their types from the provided table
*/
@Override
protected Optional<Map<String, String>> _call() {
if (dataStore == null) {
throw new GeoToolsOpException(StatusCode.DATASTORE_NOT_DEFINED);
}
if (table == null || table.isEmpty()) {
throw new GeoToolsOpException(StatusCode.TABLE_NOT_DEFINED);
}
Map<String, String> propertyMap = new HashMap<String, String>();
boolean foundTable = false;
List<Name> typeNames;
try {
typeNames = dataStore.getNames();
} catch (Exception e) {
throw new GeoToolsOpException(StatusCode.UNABLE_TO_GET_NAMES);
}
for (Name typeName : typeNames) {
if (!table.equals(typeName.toString()))
continue;
foundTable = true;
SimpleFeatureSource featureSource;
try {
featureSource = dataStore.getFeatureSource(typeName);
} catch (Exception e) {
throw new GeoToolsOpException(StatusCode.UNABLE_TO_GET_FEATURES);
}
SimpleFeatureType featureType = featureSource.getSchema();
Collection<PropertyDescriptor> descriptors = featureType.getDescriptors();
for (PropertyDescriptor descriptor : descriptors) {
propertyMap.put(descriptor.getName().toString(), descriptor.getType().getBinding()
.getSimpleName());
}
}
if (!foundTable) {
return Optional.absent();
}
return Optional.of(propertyMap);
}
/**
* @param table the table to describe
* @return {@code this}
*/
public DescribeOp setTable(String table) {
this.table = table;
return this;
}
/**
* @param dataStore the data store that contains the table to describe
* @return {@code this}
* @see DataStore
*/
public DescribeOp setDataStore(DataStore dataStore) {
this.dataStore = dataStore;
return this;
}
}