/*
    * Copyright (C) 2013, Robin Stocker <robin@nibor.org> 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.lib;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.junit.Test;
  
  public class RefDatabaseConflictingNamesTest {
  
  	private RefDatabase refDatabase = new RefDatabase() {
  		@Override
  		public Map<String, Ref> getRefs(String prefix) throws IOException {
  			if (ALL.equals(prefix)) {
  				Map<String, Ref> existing = new HashMap<>();
  				existing.put("refs/heads/a/b", null /* not used */);
  				existing.put("refs/heads/q", null /* not used */);
  				return existing;
  			}
  			return Collections.emptyMap();
  		}
  
  		@Override
  		public Ref peel(Ref ref) throws IOException {
  			return null;
  		}
  
  		@Override
  		public RefUpdate newUpdate(String name, boolean detach)
  				throws IOException {
  			return null;
  		}
  
  		@Override
  		public RefRename newRename(String fromName, String toName)
  				throws IOException {
  			return null;
  		}
  
  		@Override
  		public boolean isNameConflicting(String name) throws IOException {
  			return false;
  		}
  
  		@Override
  		public Ref exactRef(String name) throws IOException {
  			return null;
  		}
  
  		@Override
  		public List<Ref> getAdditionalRefs() throws IOException {
  			return null;
  		}
  
  		@Override
  		public void create() throws IOException {
  			// Not needed
  		}
  
  		@Override
  		public void close() {
  			// Not needed
  		}
  	};
  
  	@Test
  	public void testGetConflictingNames() throws IOException {
  		// new references cannot replace an existing container
  		assertConflictingNames("refs", "refs/heads/a/b", "refs/heads/q");
  		assertConflictingNames("refs/heads", "refs/heads/a/b", "refs/heads/q");
  		assertConflictingNames("refs/heads/a", "refs/heads/a/b");
  
  		// existing reference is not conflicting
  		assertNoConflictingNames("refs/heads/a/b");
  
  		// new references are not conflicting
  		assertNoConflictingNames("refs/heads/a/d");
  		assertNoConflictingNames("refs/heads/master");
  
  		// existing reference must not be used as a container
  		assertConflictingNames("refs/heads/a/b/c", "refs/heads/a/b");
 		assertConflictingNames("refs/heads/q/master", "refs/heads/q");
 	}
 
 	private void assertNoConflictingNames(String proposed) throws IOException {
 		assertTrue("expected conflicting names to be empty", refDatabase
 				.getConflictingNames(proposed).isEmpty());
 	}
 
 	private void assertConflictingNames(String proposed, String... conflicts)
 			throws IOException {
 		Set<String> expected = new HashSet<>(Arrays.asList(conflicts));
 		assertEquals(expected,
 				new HashSet<>(refDatabase.getConflictingNames(proposed)));
 	}
 }