| /* |
| * 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.client.solrj.io.stream; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.solr.client.solrj.io.Tuple; |
| import org.apache.solr.client.solrj.io.comp.StreamComparator; |
| import org.apache.solr.client.solrj.io.stream.expr.Explanation; |
| import org.apache.solr.client.solrj.io.stream.expr.Explanation.ExpressionType; |
| import org.apache.solr.client.solrj.io.stream.expr.Expressible; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExplanation; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpression; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamFactory; |
| |
| /** |
| * @since 6.6.0 |
| */ |
| public class GetStream extends TupleStream implements Expressible { |
| |
| private static final long serialVersionUID = 1; |
| |
| private StreamContext streamContext; |
| private String name; |
| private Iterator<Tuple> tupleIterator; |
| |
| public GetStream(String name) throws IOException { |
| init(name); |
| } |
| |
| public GetStream(StreamExpression expression, StreamFactory factory) throws IOException { |
| String name = factory.getValueOperand(expression, 0); |
| init(name); |
| } |
| |
| private void init(String name) { |
| this.name = name; |
| } |
| |
| @Override |
| public StreamExpression toExpression(StreamFactory factory) throws IOException{ |
| return toExpression(factory, true); |
| } |
| |
| private StreamExpression toExpression(StreamFactory factory, boolean includeStreams) throws IOException { |
| // function name |
| StreamExpression expression = new StreamExpression(factory.getFunctionName(this.getClass())); |
| expression.addParameter(name); |
| return expression; |
| } |
| |
| @Override |
| public Explanation toExplanation(StreamFactory factory) throws IOException { |
| |
| StreamExplanation explanation = new StreamExplanation(getStreamNodeId().toString()); |
| explanation.setFunctionName(factory.getFunctionName(this.getClass())); |
| explanation.setImplementingClass(this.getClass().getName()); |
| explanation.setExpressionType(ExpressionType.STREAM_SOURCE); |
| explanation.setExpression(toExpression(factory, false).toString()); |
| return explanation; |
| } |
| |
| public void setStreamContext(StreamContext context) { |
| this.streamContext = context; |
| } |
| |
| public List<TupleStream> children() { |
| List<TupleStream> l = new ArrayList<>(); |
| return l; |
| } |
| |
| public Tuple read() throws IOException { |
| if (tupleIterator.hasNext()) { |
| Tuple t = tupleIterator.next(); |
| return t.clone(); |
| } else { |
| return Tuple.EOF(); |
| } |
| } |
| |
| public void close() throws IOException { |
| } |
| |
| @SuppressWarnings({"unchecked"}) |
| public void open() throws IOException { |
| Map<String, Object> lets = streamContext.getLets(); |
| Object o = lets.get(name); |
| @SuppressWarnings({"rawtypes"}) |
| List l = null; |
| if(o instanceof List) { |
| l = (List)o; |
| tupleIterator = l.iterator(); |
| } |
| } |
| |
| /** Return the stream sort - ie, the order in which records are returned */ |
| public StreamComparator getStreamSort(){ |
| return null; |
| } |
| |
| public int getCost() { |
| return 0; |
| } |
| } |