| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.pulsar.common.protocol.schema; |
| |
| import com.google.common.hash.HashCode; |
| import com.google.common.hash.HashFunction; |
| import com.google.common.hash.Hashing; |
| import lombok.EqualsAndHashCode; |
| import org.apache.pulsar.client.api.Schema; |
| import org.apache.pulsar.client.impl.schema.SchemaInfoImpl; |
| import org.apache.pulsar.common.schema.SchemaInfo; |
| import org.apache.pulsar.common.schema.SchemaType; |
| |
| /** |
| * Schema hash wrapper with a HashCode inner type. |
| */ |
| @EqualsAndHashCode |
| public class SchemaHash { |
| |
| private static final HashFunction hashFunction = Hashing.sha256(); |
| private static final SchemaHash EMPTY_SCHEMA_HASH = new SchemaHash(hashFunction.hashBytes(new byte[0]), null); |
| |
| private final HashCode hash; |
| |
| private final SchemaType schemaType; |
| |
| private SchemaHash(HashCode hash, SchemaType schemaType) { |
| this.hash = hash; |
| this.schemaType = schemaType; |
| } |
| |
| public static SchemaHash of(Schema schema) { |
| if (schema == null || schema.getSchemaInfo() == null) { |
| return EMPTY_SCHEMA_HASH; |
| } |
| return ((SchemaInfoImpl) schema.getSchemaInfo()).getSchemaHash(); |
| } |
| |
| public static SchemaHash of(SchemaData schemaData) { |
| return of(schemaData.getData(), schemaData.getType()); |
| } |
| |
| public static SchemaHash of(SchemaInfo schemaInfo) { |
| if (schemaInfo == null) { |
| return EMPTY_SCHEMA_HASH; |
| } |
| return ((SchemaInfoImpl) schemaInfo).getSchemaHash(); |
| } |
| |
| public static SchemaHash empty() { |
| return EMPTY_SCHEMA_HASH; |
| } |
| |
| // Shouldn't call this method frequently, otherwise will bring performance regression |
| public static SchemaHash of(byte[] schemaBytes, SchemaType schemaType) { |
| return new SchemaHash(hashFunction.hashBytes(schemaBytes == null ? new byte[0] : schemaBytes), schemaType); |
| } |
| |
| public byte[] asBytes() { |
| return hash.asBytes(); |
| } |
| } |