| /* |
| * 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 org.apache.cassandra.cql3.ColumnSpecification; |
| import org.apache.cassandra.cql3.QueryOptions; |
| import org.apache.cassandra.cql3.selection.Selection.ResultSetBuilder; |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.db.marshal.UTF8Type; |
| import org.apache.cassandra.db.marshal.UserType; |
| import org.apache.cassandra.exceptions.InvalidRequestException; |
| |
| final class FieldSelector extends Selector |
| { |
| private final UserType type; |
| private final int field; |
| private final Selector selected; |
| |
| public static Factory newFactory(final UserType type, final int field, final Selector.Factory factory) |
| { |
| return new Factory() |
| { |
| protected String getColumnName() |
| { |
| return String.format("%s.%s", factory.getColumnName(), type.fieldName(field)); |
| } |
| |
| protected AbstractType<?> getReturnType() |
| { |
| return type.fieldType(field); |
| } |
| |
| protected void addColumnMapping(SelectionColumnMapping mapping, ColumnSpecification resultsColumn) |
| { |
| factory.addColumnMapping(mapping, resultsColumn); |
| } |
| |
| public Selector newInstance(QueryOptions options) throws InvalidRequestException |
| { |
| return new FieldSelector(type, field, factory.newInstance(options)); |
| } |
| |
| public boolean isAggregateSelectorFactory() |
| { |
| return factory.isAggregateSelectorFactory(); |
| } |
| }; |
| } |
| |
| public void addInput(int protocolVersion, ResultSetBuilder rs) throws InvalidRequestException |
| { |
| selected.addInput(protocolVersion, rs); |
| } |
| |
| public ByteBuffer getOutput(int protocolVersion) throws InvalidRequestException |
| { |
| ByteBuffer value = selected.getOutput(protocolVersion); |
| if (value == null) |
| return null; |
| ByteBuffer[] buffers = type.split(value); |
| return field < buffers.length ? buffers[field] : null; |
| } |
| |
| public AbstractType<?> getType() |
| { |
| return type.fieldType(field); |
| } |
| |
| public void reset() |
| { |
| selected.reset(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return String.format("%s.%s", selected, type.fieldName(field)); |
| } |
| |
| private FieldSelector(UserType type, int field, Selector selected) |
| { |
| this.type = type; |
| this.field = field; |
| this.selected = selected; |
| } |
| } |