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/*
* Copyright (C) 2020, Google LLC and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.revwalk;
import java.io.IOException;
import java.util.Collection;
import java.util.Optional;
import java.util.stream.Stream;
/**
* Checks if all objects are reachable from certain starting points.
*
* This is an expensive check that browses commits, trees, blobs and tags. For
* reachability just between commits see {@link ReachabilityChecker}
* implementations.
*
* @since 5.8
*/
public interface ObjectReachabilityChecker {
/**
* Checks that all targets are reachable from the starters.
*
* @implSpec Missing or invalid objects are reported as illegal state.
* Caller should have found them while translating ObjectIds into
* RevObjects. They can only happen here if the caller is mixing
* revwalks.
*
* @param targets
* objects to check for reachability from the starters
* @param starters
* objects known to be reachable to the caller
* @return Optional a single unreachable target if there are any (there
* could be more). Empty optional means all targets are reachable.
* @throws IOException
* Cannot access underlying storage
*/
Optional<RevObject> areAllReachable(Collection<RevObject> targets,
Stream<RevObject> starters) throws IOException;
}
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