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| [*.json] | ||
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| [*.jsonc] | ||
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| [*.toml] | ||
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| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * Copyright 2023 The Enola <https://enola.dev> Authors | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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 dev.enola.core; | ||
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| import com.google.protobuf.ByteString; | ||
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| import java.nio.ByteBuffer; | ||
| import java.util.Arrays; | ||
| import java.util.UUID; | ||
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| /** | ||
| * Sequence of Bytes, of variable length, and immutable; often used as an Enola Type / Entity ID. Do | ||
| * not use this for "BLOBs" (like images or so). The hashCode is cached. | ||
| * | ||
| * <p>In Enola, these IDs are intended to be unique, for a given (possibly clustered) instance. | ||
| * Federated Enola instances in theory could have duplicates, but with sufficiently long randomly | ||
| * generated bytes this is considered rare enough in practice that you can assume these are globally | ||
| * unique. | ||
| */ | ||
| // TODO Make this a (the first!) Enola "simple type", with verbs for create & asUUID! | ||
| // TODO Link to docs/**/enola.md once that's published on https://docs.enola.dev. | ||
| public final class ByteSeq implements Comparable<ByteSeq> { | ||
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| public static final ByteSeq EMPTY = new ByteSeq(new byte[0]); | ||
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| public static final class Builder { | ||
| private final byte[] bytes; | ||
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| private Builder(int size) { | ||
| bytes = new byte[size]; | ||
| } | ||
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| public ByteSeq build() { | ||
| return new ByteSeq(bytes); | ||
| } | ||
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| public Builder add(ByteBuffer bb) { | ||
| if (!bb.isReadOnly()) { | ||
| throw new IllegalArgumentException("ByteBuffer !isReadOnly()"); | ||
| } | ||
| bb.get(bytes); | ||
| return this; | ||
| } | ||
| } | ||
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| public static Builder builder(int size) { | ||
| return new Builder(size); | ||
| } | ||
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| // TODO public static final ByteSeq fromMultibase(String multibase) { | ||
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| /** | ||
| * Create a ByteSeq from an array of bytes. Prefer using the Builder instead of this, to avoid | ||
| * the implementation have to copy the array. | ||
| * | ||
| * @param bytes Bytes (which will be copied) | ||
| * @return the ByteSeq | ||
| */ | ||
| public static final ByteSeq from(byte[] bytes) { | ||
| if (bytes.length == 0) { | ||
| return EMPTY; | ||
| } | ||
| return new ByteSeq(Arrays.copyOf(bytes, bytes.length)); | ||
| } | ||
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| /** | ||
| * Create a ByteSeq from a Protocol Buffer "bytes" field. | ||
| * | ||
| * @param proto the ByteString | ||
| * @return the ByteSeq | ||
| */ | ||
| public static ByteSeq from(ByteString proto) { | ||
| return ByteSeq.builder(proto.size()).add(proto.asReadOnlyByteBuffer()).build(); | ||
| } | ||
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| // ? public static ByteSeq toByteSeq(Message proto) { return | ||
| // ByteSeq.copyFrom(proto.toByteArray()); } | ||
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| public static ByteSeq from(UUID uuid) { | ||
| var byteBuffer = ByteBuffer.allocate(16); | ||
| byteBuffer.putLong(uuid.getMostSignificantBits()); | ||
| byteBuffer.putLong(uuid.getLeastSignificantBits()); | ||
| byteBuffer.position(0); | ||
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| var builder = builder(16); | ||
| builder.add(byteBuffer.asReadOnlyBuffer()); | ||
| return builder.build(); | ||
| } | ||
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| private final byte[] bytes; | ||
| private transient int hashCode; | ||
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| private ByteSeq(byte[] bytes) { | ||
| this.bytes = bytes; | ||
| } | ||
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| public byte[] toBytes() { | ||
| return Arrays.copyOf(bytes, bytes.length); | ||
| } | ||
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| public int size() { | ||
| return bytes.length; | ||
| } | ||
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| public byte get(int index) { | ||
| return bytes[index]; | ||
| } | ||
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| // public String toString(Base base) { return Multibase.encode(Base.Base32, id.toByteArray()); } | ||
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| public ByteString toByteString() { | ||
| return ByteString.copyFrom(bytes); | ||
| } | ||
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| public UUID toUUID() { | ||
| if (bytes.length != 16) { | ||
| throw new IllegalStateException( | ||
| "toUUID() is currently only supported for length == 16, not: " + bytes.length); | ||
| } | ||
| ByteBuffer bb = ByteBuffer.wrap(bytes); | ||
| long high = bb.getLong(); | ||
| long low = bb.getLong(); | ||
| return new UUID(high, low); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| if (hashCode == 0) { | ||
| hashCode = Arrays.hashCode(bytes); | ||
| } | ||
| return hashCode; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object obj) { | ||
| if (this == obj) { | ||
| return true; | ||
| } | ||
| if (obj == null || getClass() != obj.getClass()) { | ||
| return false; | ||
| } | ||
| var other = (ByteSeq) obj; | ||
| if (hashCode() != other.hashCode()) { | ||
| return false; | ||
| } | ||
| return Arrays.equals(bytes, other.bytes); | ||
| } | ||
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| @Override | ||
| public int compareTo(ByteSeq other) { | ||
| return Arrays.compare(bytes, other.bytes); | ||
| } | ||
| } |
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