| /* |
| * 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.phoenix.execute; |
| |
| import java.sql.SQLException; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.hadoop.hbase.KeyValue; |
| import org.apache.hadoop.hbase.client.Scan; |
| import org.apache.phoenix.compile.GroupByCompiler.GroupBy; |
| import org.apache.phoenix.compile.OrderByCompiler.OrderBy; |
| import org.apache.phoenix.compile.RowProjector; |
| import org.apache.phoenix.compile.StatementContext; |
| import org.apache.phoenix.iterate.ParallelIteratorFactory; |
| import org.apache.phoenix.iterate.ParallelScanGrouper; |
| import org.apache.phoenix.iterate.ResultIterator; |
| import org.apache.phoenix.iterate.SequenceResultIterator; |
| import org.apache.phoenix.parse.FilterableStatement; |
| import org.apache.phoenix.query.KeyRange; |
| import org.apache.phoenix.schema.TableRef; |
| import org.apache.phoenix.schema.tuple.SingleKeyValueTuple; |
| import org.apache.phoenix.schema.tuple.Tuple; |
| |
| public class LiteralResultIterationPlan extends BaseQueryPlan { |
| protected final Iterable<Tuple> tuples; |
| |
| public LiteralResultIterationPlan(StatementContext context, |
| FilterableStatement statement, TableRef tableRef, RowProjector projection, |
| Integer limit, Integer offset, OrderBy orderBy, ParallelIteratorFactory parallelIteratorFactory) { |
| this(Collections.<Tuple> singletonList(new SingleKeyValueTuple(KeyValue.LOWESTKEY)), |
| context, statement, tableRef, projection, limit, offset, orderBy, parallelIteratorFactory); |
| } |
| |
| public LiteralResultIterationPlan(Iterable<Tuple> tuples, StatementContext context, |
| FilterableStatement statement, TableRef tableRef, RowProjector projection, |
| Integer limit, Integer offset, OrderBy orderBy, ParallelIteratorFactory parallelIteratorFactory) { |
| super(context, statement, tableRef, projection, context.getBindManager().getParameterMetaData(), limit, offset, orderBy, GroupBy.EMPTY_GROUP_BY, parallelIteratorFactory, null); |
| this.tuples = tuples; |
| } |
| |
| @Override |
| public List<KeyRange> getSplits() { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public List<List<Scan>> getScans() { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public boolean useRoundRobinIterator() throws SQLException { |
| return false; |
| } |
| |
| @Override |
| protected ResultIterator newIterator(ParallelScanGrouper scanGrouper, Scan scan) |
| throws SQLException { |
| ResultIterator scanner = new ResultIterator() { |
| private final Iterator<Tuple> tupleIterator = tuples.iterator(); |
| private boolean closed = false; |
| private int count = 0; |
| private int offsetCount = 0; |
| |
| @Override |
| public void close() throws SQLException { |
| this.closed = true;; |
| } |
| |
| @Override |
| public Tuple next() throws SQLException { |
| while (!this.closed && (offset != null && offsetCount < offset) && tupleIterator.hasNext()) { |
| offsetCount++; |
| tupleIterator.next(); |
| } |
| if (!this.closed |
| && (limit == null || count++ < limit) |
| && tupleIterator.hasNext()) { |
| return tupleIterator.next(); |
| } |
| return null; |
| } |
| |
| @Override |
| public void explain(List<String> planSteps) { |
| } |
| |
| }; |
| |
| if (context.getSequenceManager().getSequenceCount() > 0) { |
| scanner = new SequenceResultIterator(scanner, context.getSequenceManager()); |
| } |
| |
| return scanner; |
| } |
| } |