| /* |
| * 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.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import com.google.common.base.Objects; |
| |
| import org.apache.cassandra.cql3.QueryOptions; |
| import org.apache.cassandra.cql3.Tuples; |
| import org.apache.cassandra.db.TypeSizes; |
| import org.apache.cassandra.db.filter.ColumnFilter.Builder; |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.db.marshal.TupleType; |
| import org.apache.cassandra.exceptions.InvalidRequestException; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| import org.apache.cassandra.schema.TableMetadata; |
| import org.apache.cassandra.transport.ProtocolVersion; |
| |
| /** |
| * <code>Selector</code> for literal tuples (e.g. (min(value), max(value), count(value))). |
| * |
| */ |
| final class TupleSelector extends Selector |
| { |
| protected static final SelectorDeserializer deserializer = new SelectorDeserializer() |
| { |
| protected Selector deserialize(DataInputPlus in, int version, TableMetadata metadata) throws IOException |
| { |
| AbstractType<?> type = readType(metadata, in); |
| int size = in.readUnsignedVInt32(); |
| List<Selector> elements = new ArrayList<>(size); |
| for (int i = 0; i < size; i++) |
| elements.add(serializer.deserialize(in, version, metadata)); |
| |
| return new TupleSelector(type, elements); |
| } |
| }; |
| |
| /** |
| * The tuple type. |
| */ |
| private final AbstractType<?> type; |
| |
| /** |
| * The tuple 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 Tuples.tupleToString(factories, Factory::getColumnName); |
| } |
| |
| public Selector newInstance(final QueryOptions options) |
| { |
| return new TupleSelector(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(InputRow input) |
| { |
| for (int i = 0, m = elements.size(); i < m; i++) |
| elements.get(i).addInput(input); |
| } |
| |
| public ByteBuffer getOutput(ProtocolVersion protocolVersion) throws InvalidRequestException |
| { |
| ByteBuffer[] buffers = new ByteBuffer[elements.size()]; |
| for (int i = 0, m = elements.size(); i < m; i++) |
| { |
| buffers[i] = elements.get(i).getOutput(protocolVersion); |
| } |
| return TupleType.buildValue(buffers); |
| } |
| |
| public void reset() |
| { |
| for (int i = 0, m = elements.size(); i < m; i++) |
| elements.get(i).reset(); |
| } |
| |
| @Override |
| public boolean isTerminal() |
| { |
| for (int i = 0, m = elements.size(); i < m; i++) |
| { |
| if (!elements.get(i).isTerminal()) |
| return false; |
| } |
| return true; |
| } |
| |
| public AbstractType<?> getType() |
| { |
| return type; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return Tuples.tupleToString(elements); |
| } |
| |
| private TupleSelector(AbstractType<?> type, List<Selector> elements) |
| { |
| super(Kind.TUPLE_SELECTOR); |
| this.type = type; |
| this.elements = elements; |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) |
| return true; |
| |
| if (!(o instanceof TupleSelector)) |
| return false; |
| |
| TupleSelector s = (TupleSelector) o; |
| |
| return Objects.equal(type, s.type) |
| && Objects.equal(elements, s.elements); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return Objects.hashCode(type, elements); |
| } |
| |
| @Override |
| protected int serializedSize(int version) |
| { |
| int size = sizeOf(type) + TypeSizes.sizeofUnsignedVInt(elements.size()); |
| |
| for (int i = 0, m = elements.size(); i < m; i++) |
| size += serializer.serializedSize(elements.get(i), version); |
| |
| return size; |
| } |
| |
| @Override |
| protected void serialize(DataOutputPlus out, int version) throws IOException |
| { |
| writeType(out, type); |
| out.writeUnsignedVInt32(elements.size()); |
| |
| for (int i = 0, m = elements.size(); i < m; i++) |
| serializer.serialize(elements.get(i), out, version); |
| } |
| } |