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- /*
- * Copyright (C) 2011, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.internal.storage.dfs;
-
- import static java.nio.charset.StandardCharsets.UTF_8;
-
- import java.util.Arrays;
-
- import org.eclipse.jgit.annotations.Nullable;
- import org.eclipse.jgit.internal.storage.pack.PackExt;
-
- /**
- * Key used by {@link org.eclipse.jgit.internal.storage.dfs.DfsBlockCache} to disambiguate streams.
- */
- public abstract class DfsStreamKey {
- /**
- * Create a {@code DfsStreamKey}
- *
- * @param repo
- * description of the containing repository.
- * @param name
- * compute the key from a string name.
- * @param ext
- * pack file extension, or {@code null}.
- * @return key for {@code name}
- */
- public static DfsStreamKey of(DfsRepositoryDescription repo, String name,
- @Nullable PackExt ext) {
- return new ByteArrayDfsStreamKey(repo, name.getBytes(UTF_8), ext);
- }
-
- final int hash;
-
- final int packExtPos;
-
- /**
- * Constructor for DfsStreamKey.
- *
- * @param hash
- * hash of the other identifying components of the key.
- * @param ext
- * pack file extension, or {@code null}.
- */
- protected DfsStreamKey(int hash, @Nullable PackExt ext) {
- // Multiply by 31 here so we can more directly combine with another
- // value without doing the multiply there.
- this.hash = hash * 31;
- this.packExtPos = ext == null ? 0 : ext.getPosition();
- }
-
- /** {@inheritDoc} */
- @Override
- public int hashCode() {
- return hash;
- }
-
- /** {@inheritDoc} */
- @Override
- public abstract boolean equals(Object o);
-
- /** {@inheritDoc} */
- @SuppressWarnings("boxing")
- @Override
- public String toString() {
- return String.format("DfsStreamKey[hash=%08x]", hash); //$NON-NLS-1$
- }
-
- private static final class ByteArrayDfsStreamKey extends DfsStreamKey {
- private final DfsRepositoryDescription repo;
-
- private final byte[] name;
-
- ByteArrayDfsStreamKey(DfsRepositoryDescription repo, byte[] name,
- @Nullable PackExt ext) {
- super(repo.hashCode() * 31 + Arrays.hashCode(name), ext);
- this.repo = repo;
- this.name = name;
- }
-
- @Override
- public boolean equals(Object o) {
- if (o instanceof ByteArrayDfsStreamKey) {
- ByteArrayDfsStreamKey k = (ByteArrayDfsStreamKey) o;
- return hash == k.hash && repo.equals(k.repo)
- && Arrays.equals(name, k.name);
- }
- return false;
- }
- }
-
- static final class ForReverseIndex extends DfsStreamKey {
- private final DfsStreamKey idxKey;
-
- ForReverseIndex(DfsStreamKey idxKey) {
- super(idxKey.hash + 1, null);
- this.idxKey = idxKey;
- }
-
- @Override
- public boolean equals(Object o) {
- return o instanceof ForReverseIndex
- && idxKey.equals(((ForReverseIndex) o).idxKey);
- }
- }
- }
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