org.opentripplanner.datastore.CompositeDataSource Maven / Gradle / Ivy
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package org.opentripplanner.datastore;
import java.io.Closeable;
import java.util.Collection;
/**
* A composite data source contain a collection of other {@link DataSource}s.
*
* Example are file directories and zip files with gtfs or netex data.
*/
public interface CompositeDataSource extends DataSource, Closeable {
/**
* Open the composite data source and read the content. For a random access data source
* (local-file system), this does not read each entry, but just the metadata for each of them.
* But, for a streamed data source(cloud storage) it will fetch the entire content - this might
* be using a lot of memory.
*/
Collection content();
/**
* Retrieve a single entry by name, or {@code null} if not found.
*
* Example:
*
* {@code DataSource routesSrc = gtfsSource.entry("routes.txt")}
*/
DataSource entry(String name);
/**
* Delete content and container in store.
*/
default void delete() {
throw new UnsupportedOperationException(
"This datasource type " + getClass().getSimpleName()
+ " do not support DELETE. Can not delete: " + path()
);
}
}