protected <T extends ESEntity> MultiGetRequestBuilder buildMultiGetRequest(
Class<T> entityClass, long... osmIds) {
ESEntityType type = ESEntityType.valueOf(entityClass);
MultiGetRequestBuilder request = client.prepareMultiGet();
for (long osmId : osmIds) {
request.add(
new Item(indexName, type.getIndiceName(), String.valueOf(osmId))
.fields("centroid", "lengthKm", "areaKm2", "shape", "tags"));
}
return request;
}
/**
* Delete an OSM entity.
*
* <p><b>Warning:</b> please note that deleting {@link Relation} and {@link Bound} is not yet
* supported. Trying to delete such {@link Entity} causes this method to throw an {@link
* UnsupportedOperationException}.
*
* @param osmId the OSM id that identifies the Entity
* @param entityClass the class (among {@link Node}, {@link Way}, {@link Relation} and {@link
* Bound}) of the Entity
* @return True if the Entity was deleted, false otherwise (i.e. the Entity was not found)
* @throws IllegalArgumentException if the provided entityClass is null or invalid
* @throws DaoException if something was wrong during the elasticsearch request
*/
public <T extends ESEntity> boolean delete(Class<T> entityClass, long osmId) {
try {
String indiceName = ESEntityType.valueOf(entityClass).getIndiceName();
return client
.prepareDelete(indexName, indiceName, Long.toString(osmId))
.execute()
.actionGet()
.isFound();
} catch (Exception e) {
String indiceName = ESEntityType.valueOf(entityClass).getIndiceName();
String message =
String.format("Unable to delete entity %s in %s/%s", osmId, indexName, indiceName);
throw new DaoException(message, e);
}
}
/**
* Find all OSM entities.
*
* <p><b>Warning:</b> all objects are retrieved from elasticsearch and mounted in memory. In case
* of large OSM data sets, ensure you have allocated enough heap. If you already know what ids to
* retrieve, please consider the {@link #findAll(Class, long...)} method instead.
*
* <p><b>Warning:</b> please note that finding all {@link Relation} and {@link Bound} is not yet
* supported. Trying to find such {@link Entity} causes this method to throw an {@link
* UnsupportedOperationException}.
*
* @param entityClass the class (among {@link Node}, {@link Way}, {@link Relation} and {@link
* Bound}) of the Entities
* @param osmIds an array of OSM id that identifies the Entities. if null, all Entities will be
* retrieved (be aware of your heap size)
* @return The Entity objects as list if all ids was found
* @throws IllegalArgumentException if the provided entityClass is null or invalid
* @throws DaoException if something was wrong during the elasticsearch request
*/
public <T extends ESEntity> List<T> findAll(Class<T> entityClass, long... osmIds) {
if (osmIds == null || osmIds.length == 0)
return Collections.unmodifiableList(new ArrayList<T>(0));
try {
MultiGetRequestBuilder request = buildMultiGetRequest(entityClass, osmIds);
return executeMultiGetRequest(entityClass, request);
} catch (Exception e) {
if (e instanceof DaoException) throw (DaoException) e;
String indiceName = ESEntityType.valueOf(entityClass).getIndiceName();
throw new DaoException("Unable to find all " + indiceName + " entities", e);
}
}