| /* |
| * 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.cassandra.schema; |
| |
| import java.util.Objects; |
| import java.util.UUID; |
| |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * Immutable snapshot of the current schema along with its version. |
| */ |
| public class DistributedSchema |
| { |
| public static final DistributedSchema EMPTY = new DistributedSchema(Keyspaces.none(), SchemaConstants.emptyVersion); |
| |
| private final Keyspaces keyspaces; |
| private final UUID version; |
| |
| public DistributedSchema(Keyspaces keyspaces, UUID version) |
| { |
| Objects.requireNonNull(keyspaces); |
| Objects.requireNonNull(version); |
| this.keyspaces = keyspaces; |
| this.version = version; |
| validate(); |
| } |
| |
| public Keyspaces getKeyspaces() |
| { |
| return keyspaces; |
| } |
| |
| public boolean isEmpty() |
| { |
| return SchemaConstants.emptyVersion.equals(version); |
| } |
| |
| public UUID getVersion() |
| { |
| return version; |
| } |
| |
| /** |
| * Converts the given schema version to a string. Returns {@code unknown}, if {@code version} is {@code null} |
| * or {@code "(empty)"}, if {@code version} refers to an {@link SchemaConstants#emptyVersion empty) schema. |
| */ |
| public static String schemaVersionToString(UUID version) |
| { |
| return version == null |
| ? "unknown" |
| : SchemaConstants.emptyVersion.equals(version) |
| ? "(empty)" |
| : version.toString(); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| DistributedSchema schema = (DistributedSchema) o; |
| return keyspaces.equals(schema.keyspaces) && version.equals(schema.version); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return Objects.hash(keyspaces, version); |
| } |
| |
| private void validate() |
| { |
| keyspaces.forEach(ksm -> { |
| ksm.tables.forEach(tm -> Preconditions.checkArgument(tm.keyspace.equals(ksm.name), "Table %s metadata points to keyspace %s while defined in keyspace %s", tm.name, tm.keyspace, ksm.name)); |
| ksm.views.forEach(vm -> Preconditions.checkArgument(vm.keyspace().equals(ksm.name), "View %s metadata points to keyspace %s while defined in keyspace %s", vm.name(), vm.keyspace(), ksm.name)); |
| ksm.types.forEach(ut -> Preconditions.checkArgument(ut.keyspace.equals(ksm.name), "Type %s points to keyspace %s while defined in keyspace %s", ut.name, ut.keyspace, ksm.name)); |
| ksm.userFunctions.forEach(f -> Preconditions.checkArgument(f.name().keyspace.equals(ksm.name), "Function %s points to keyspace %s while defined in keyspace %s", f.name().name, f.name().keyspace, ksm.name)); |
| }); |
| } |
| } |