| /* |
| * 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.cql3.selection; |
| |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.TreeSet; |
| |
| import org.apache.cassandra.cql3.QueryOptions; |
| import org.apache.cassandra.cql3.Sets; |
| import org.apache.cassandra.db.filter.ColumnFilter.Builder; |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.db.marshal.SetType; |
| import org.apache.cassandra.exceptions.InvalidRequestException; |
| import org.apache.cassandra.serializers.CollectionSerializer; |
| import org.apache.cassandra.transport.ProtocolVersion; |
| |
| /** |
| * <code>Selector</code> for literal set (e.g. {min(value), max(value), count(value)}). |
| * |
| */ |
| final class SetSelector extends Selector |
| { |
| /** |
| * The set type. |
| */ |
| private final SetType<?> type; |
| |
| /** |
| * The set elements |
| */ |
| private final List<Selector> elements; |
| |
| public static Factory newFactory(final AbstractType<?> type, final SelectorFactories factories) |
| { |
| return new CollectionFactory(type, factories) |
| { |
| protected String getColumnName() |
| { |
| return Sets.setToString(factories, Factory::getColumnName); |
| } |
| |
| public Selector newInstance(final QueryOptions options) |
| { |
| return new SetSelector(type, factories.newInstances(options)); |
| } |
| }; |
| } |
| |
| @Override |
| public void addFetchedColumns(Builder builder) |
| { |
| for (int i = 0, m = elements.size(); i < m; i++) |
| elements.get(i).addFetchedColumns(builder); |
| } |
| |
| public void addInput(ProtocolVersion protocolVersion, ResultSetBuilder rs) throws InvalidRequestException |
| { |
| for (int i = 0, m = elements.size(); i < m; i++) |
| elements.get(i).addInput(protocolVersion, rs); |
| } |
| |
| public ByteBuffer getOutput(ProtocolVersion protocolVersion) throws InvalidRequestException |
| { |
| Set<ByteBuffer> buffers = new TreeSet<>(type.getElementsType()); |
| for (int i = 0, m = elements.size(); i < m; i++) |
| { |
| buffers.add(elements.get(i).getOutput(protocolVersion)); |
| } |
| return CollectionSerializer.pack(buffers, buffers.size(), protocolVersion); |
| } |
| |
| public void reset() |
| { |
| for (int i = 0, m = elements.size(); i < m; i++) |
| elements.get(i).reset(); |
| } |
| |
| public AbstractType<?> getType() |
| { |
| return type; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return Sets.setToString(elements); |
| } |
| |
| private SetSelector(AbstractType<?> type, List<Selector> elements) |
| { |
| this.type = (SetType<?>) type; |
| this.elements = elements; |
| } |
| } |