| /* |
| * 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.*; |
| |
| import com.google.common.collect.ImmutableMap; |
| |
| import org.apache.cassandra.config.Schema; |
| |
| import static com.google.common.collect.Iterables.filter; |
| |
| /** |
| * For backwards compatibility, in the first instance an IndexMetadata must have |
| * TargetType.COLUMN and its Set of target columns must contain only a single |
| * ColumnIdentifier. Hence, this is what is enforced by the public factory methods |
| * on IndexMetadata. |
| * These constraints, along with the internal datastructures here will be relaxed as |
| * support is added for multiple target columns per-index and for indexes with |
| * TargetType.ROW |
| */ |
| public class Indexes implements Iterable<IndexMetadata> |
| { |
| private final ImmutableMap<String, IndexMetadata> indexesByName; |
| private final ImmutableMap<UUID, IndexMetadata> indexesById; |
| |
| private Indexes(Builder builder) |
| { |
| indexesByName = builder.indexesByName.build(); |
| indexesById = builder.indexesById.build(); |
| } |
| |
| public static Builder builder() |
| { |
| return new Builder(); |
| } |
| |
| public static Indexes none() |
| { |
| return builder().build(); |
| } |
| |
| public Iterator<IndexMetadata> iterator() |
| { |
| return indexesByName.values().iterator(); |
| } |
| |
| public int size() |
| { |
| return indexesByName.size(); |
| } |
| |
| public boolean isEmpty() |
| { |
| return indexesByName.isEmpty(); |
| } |
| |
| /** |
| * Get the index with the specified name |
| * |
| * @param name a non-qualified index name |
| * @return an empty {@link Optional} if the named index is not found; a non-empty optional of {@link IndexMetadata} otherwise |
| */ |
| public Optional<IndexMetadata> get(String name) |
| { |
| return Optional.ofNullable(indexesByName.get(name)); |
| } |
| |
| /** |
| * Answer true if contains an index with the specified name. |
| * @param name a non-qualified index name. |
| * @return true if the named index is found; false otherwise |
| */ |
| public boolean has(String name) |
| { |
| return indexesByName.containsKey(name); |
| } |
| |
| /** |
| * Get the index with the specified id |
| * |
| * @param id a UUID which identifies an index |
| * @return an empty {@link Optional} if no index with the specified id is found; a non-empty optional of |
| * {@link IndexMetadata} otherwise |
| */ |
| |
| public Optional<IndexMetadata> get(UUID id) |
| { |
| return Optional.ofNullable(indexesById.get(id)); |
| } |
| |
| /** |
| * Answer true if contains an index with the specified id. |
| * @param id a UUID which identifies an index. |
| * @return true if an index with the specified id is found; false otherwise |
| */ |
| public boolean has(UUID id) |
| { |
| return indexesById.containsKey(id); |
| } |
| |
| /** |
| * Create a SecondaryIndexes instance with the provided index added |
| */ |
| public Indexes with(IndexMetadata index) |
| { |
| if (get(index.name).isPresent()) |
| throw new IllegalStateException(String.format("Index %s already exists", index.name)); |
| |
| return builder().add(this).add(index).build(); |
| } |
| |
| /** |
| * Creates a SecondaryIndexes instance with the index with the provided name removed |
| */ |
| public Indexes without(String name) |
| { |
| IndexMetadata index = get(name).orElseThrow(() -> new IllegalStateException(String.format("Index %s doesn't exist", name))); |
| return builder().add(filter(this, v -> v != index)).build(); |
| } |
| |
| /** |
| * Creates a SecondaryIndexes instance which contains an updated index definition |
| */ |
| public Indexes replace(IndexMetadata index) |
| { |
| return without(index.name).with(index); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| return this == o || (o instanceof Indexes && indexesByName.equals(((Indexes) o).indexesByName)); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return indexesByName.hashCode(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return indexesByName.values().toString(); |
| } |
| |
| public static String getAvailableIndexName(String ksName, String cfName, String indexNameRoot) |
| { |
| |
| KeyspaceMetadata ksm = Schema.instance.getKSMetaData(ksName); |
| Set<String> existingNames = ksm == null ? new HashSet<>() : ksm.existingIndexNames(null); |
| String baseName = IndexMetadata.getDefaultIndexName(cfName, indexNameRoot); |
| String acceptedName = baseName; |
| int i = 0; |
| while (existingNames.contains(acceptedName)) |
| acceptedName = baseName + '_' + (++i); |
| |
| return acceptedName; |
| } |
| |
| public static final class Builder |
| { |
| final ImmutableMap.Builder<String, IndexMetadata> indexesByName = new ImmutableMap.Builder<>(); |
| final ImmutableMap.Builder<UUID, IndexMetadata> indexesById = new ImmutableMap.Builder<>(); |
| |
| private Builder() |
| { |
| } |
| |
| public Indexes build() |
| { |
| return new Indexes(this); |
| } |
| |
| public Builder add(IndexMetadata index) |
| { |
| indexesByName.put(index.name, index); |
| indexesById.put(index.id, index); |
| return this; |
| } |
| |
| public Builder add(Iterable<IndexMetadata> indexes) |
| { |
| indexes.forEach(this::add); |
| return this; |
| } |
| } |
| } |