| /* |
| * 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.solr.handler.sql; |
| |
| import org.apache.calcite.linq4j.Enumerator; |
| import org.apache.solr.client.solrj.io.Tuple; |
| import org.apache.solr.client.solrj.io.stream.TupleStream; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.lang.invoke.MethodHandles; |
| import java.util.Date; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** Enumerator that reads from a Solr collection. */ |
| class SolrEnumerator implements Enumerator<Object> { |
| private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| |
| private final TupleStream tupleStream; |
| @SuppressWarnings({"rawtypes"}) |
| private final List<Map.Entry<String, Class>> fields; |
| private Tuple current; |
| |
| /** Creates a SolrEnumerator. |
| * |
| * @param tupleStream Solr TupleStream |
| * @param fields Fields to get from each Tuple |
| */ |
| @SuppressWarnings({"rawtypes"}) |
| SolrEnumerator(TupleStream tupleStream, List<Map.Entry<String, Class>> fields) { |
| |
| this.tupleStream = tupleStream; |
| try { |
| this.tupleStream.open(); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| this.fields = fields; |
| this.current = null; |
| } |
| |
| /** Produce the next row from the results |
| * |
| * @return A new row from the results |
| */ |
| public Object current() { |
| if (fields.size() == 1) { |
| return this.getter(current, fields.get(0)); |
| } else { |
| // Build an array with all fields in this row |
| Object[] row = new Object[fields.size()]; |
| for (int i = 0; i < fields.size(); i++) { |
| row[i] = this.getter(current, fields.get(i)); |
| } |
| |
| return row; |
| } |
| } |
| |
| @SuppressWarnings({"rawtypes"}) |
| private Object getter(Tuple tuple, Map.Entry<String, Class> field) { |
| Object val = tuple.get(field.getKey()); |
| |
| if(val == null) { |
| return null; |
| } |
| |
| Class clazz = field.getValue(); |
| if(clazz.equals(Long.class)) { |
| if(val instanceof Double) { |
| return this.getRealVal(val); |
| } |
| return val; |
| } |
| |
| if (clazz.equals(Date.class)) { |
| // make sure the val returned is a Date as Avatica cannot deal with string values for Timestamp fields |
| val = tuple.getDate(field.getKey()); |
| } |
| |
| return val; |
| } |
| |
| private Object getRealVal(Object val) { |
| // Check if Double is really a Long |
| if(val instanceof Double) { |
| double doubleVal = (double) val; |
| //make sure that double has no decimals and fits within Long |
| if(doubleVal % 1 == 0 && doubleVal >= Long.MIN_VALUE && doubleVal <= Long.MAX_VALUE) { |
| return (long)doubleVal; |
| } |
| return doubleVal; |
| } |
| |
| // Wasn't a double so just return original Object |
| return val; |
| } |
| |
| public boolean moveNext() { |
| try { |
| Tuple tuple = this.tupleStream.read(); |
| if (tuple.EOF) { |
| return false; |
| } else { |
| current = tuple; |
| return true; |
| } |
| } catch (IOException e) { |
| log.error("IOException", e); |
| return false; |
| } |
| } |
| |
| public void reset() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void close() { |
| if(this.tupleStream != null) { |
| try { |
| this.tupleStream.close(); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| } |