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/*
* Copyright (C) 2011, Google Inc. 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.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();
}
@Override
public int hashCode() {
return hash;
}
@Override
public abstract boolean equals(Object o);
@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;
}
}
}
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