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// Copyright 2019 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.actions;
import com.google.protobuf.ByteString;
import java.io.Serializable;
/** A marker interface for objects which can return a byte[] digest. */
@FunctionalInterface
public interface HasDigest extends Serializable {
byte[] getDigest();
HasDigest EMPTY = new ByteStringDigest(new byte[] {});
/** An immutable wrapper around a {@code byte[]} digest. */
final class ByteStringDigest implements HasDigest {
private final ByteString bytes;
public ByteStringDigest(byte[] bytes) {
this.bytes = ByteString.copyFrom(bytes);
}
@Override
public byte[] getDigest() {
return bytes.toByteArray();
}
@Override
public boolean equals(Object other) {
if (other instanceof ByteStringDigest) {
return bytes.equals(((ByteStringDigest) other).bytes);
}
return false;
}
@Override
public int hashCode() {
return bytes.hashCode();
}
}
}