| /* |
| * 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 com.google.common.base.Objects; |
| |
| import org.apache.cassandra.schema.ColumnMetadata; |
| import org.apache.cassandra.schema.TableMetadata; |
| import org.apache.cassandra.cql3.ColumnSpecification; |
| import org.apache.cassandra.cql3.QueryOptions; |
| import org.apache.cassandra.cql3.Term; |
| import org.apache.cassandra.db.filter.ColumnFilter; |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| import org.apache.cassandra.transport.ProtocolVersion; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| |
| /** |
| * Selector representing a simple term (literals or bound variables). |
| * <p> |
| * Note that we know the term does not include function calls for instance (this is actually enforced by the parser), those |
| * being dealt with by their own Selector. |
| */ |
| public class TermSelector 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); |
| ByteBuffer value = ByteBufferUtil.readWithVIntLength(in); |
| return new TermSelector(value, type); |
| } |
| }; |
| |
| private final ByteBuffer value; |
| private final AbstractType<?> type; |
| |
| public static Factory newFactory(final String name, final Term term, final AbstractType<?> type) |
| { |
| return new Factory() |
| { |
| protected String getColumnName() |
| { |
| return name; |
| } |
| |
| protected AbstractType<?> getReturnType() |
| { |
| return type; |
| } |
| |
| protected void addColumnMapping(SelectionColumnMapping mapping, ColumnSpecification resultColumn) |
| { |
| mapping.addMapping(resultColumn, (ColumnMetadata)null); |
| } |
| |
| public Selector newInstance(QueryOptions options) |
| { |
| return new TermSelector(term.bindAndGet(options), type); |
| } |
| |
| public void addFetchedColumns(ColumnFilter.Builder builder) |
| { |
| } |
| |
| public boolean areAllFetchedColumnsKnown() |
| { |
| return true; |
| } |
| }; |
| } |
| |
| TermSelector(ByteBuffer value, AbstractType<?> type) |
| { |
| super(Kind.TERM_SELECTOR); |
| this.value = value; |
| this.type = type; |
| } |
| |
| public void addFetchedColumns(ColumnFilter.Builder builder) |
| { |
| } |
| |
| public void addInput(InputRow input) |
| { |
| } |
| |
| public ByteBuffer getOutput(ProtocolVersion protocolVersion) |
| { |
| return value; |
| } |
| |
| public AbstractType<?> getType() |
| { |
| return type; |
| } |
| |
| public void reset() |
| { |
| } |
| |
| @Override |
| public boolean isTerminal() |
| { |
| return true; |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) |
| return true; |
| |
| if (!(o instanceof TermSelector)) |
| return false; |
| |
| TermSelector s = (TermSelector) o; |
| |
| return Objects.equal(value, s.value) |
| && Objects.equal(type, s.type); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return Objects.hashCode(value, type); |
| } |
| |
| @Override |
| protected int serializedSize(int version) |
| { |
| return sizeOf(type) + ByteBufferUtil.serializedSizeWithVIntLength(value); |
| } |
| |
| @Override |
| protected void serialize(DataOutputPlus out, int version) throws IOException |
| { |
| writeType(out, type); |
| ByteBufferUtil.writeWithVIntLength(value, out); |
| } |
| } |