| /* |
| * 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.core; |
| |
| import java.io.IOException; |
| import java.util.List; |
| |
| 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.StreamContext; |
| import org.apache.solr.client.solrj.io.stream.TupleStream; |
| import org.apache.solr.client.solrj.io.stream.expr.Explanation; |
| 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.StreamExpressionParameter; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamFactory; |
| |
| public class HelloStream extends TupleStream implements Expressible{ |
| |
| boolean isSentHelloWorld = false; |
| |
| public HelloStream() { |
| } |
| |
| public HelloStream(StreamExpression expression, StreamFactory factory) throws IOException{ |
| |
| } |
| |
| @Override |
| public void setStreamContext(StreamContext context) { |
| |
| } |
| |
| @Override |
| public List<TupleStream> children() { |
| return null; |
| } |
| |
| @Override |
| public void open() throws IOException { |
| |
| } |
| |
| @Override |
| public void close() throws IOException { |
| |
| } |
| |
| @Override |
| public Tuple read() throws IOException { |
| if (isSentHelloWorld) { |
| return Tuple.EOF(); |
| } else { |
| isSentHelloWorld = true; |
| return new Tuple("msg", "Hello World!"); |
| } |
| } |
| |
| @Override |
| public StreamComparator getStreamSort() { |
| return null; |
| } |
| |
| @Override |
| public StreamExpressionParameter toExpression(StreamFactory factory) throws IOException { |
| StreamExpression expression = new StreamExpression(factory.getFunctionName(this.getClass())); |
| return expression; |
| } |
| |
| @Override |
| public Explanation toExplanation(StreamFactory factory) throws IOException { |
| return new StreamExplanation(getStreamNodeId().toString()) |
| .withFunctionName("hello") |
| .withImplementingClass(this.getClass().getName()) |
| .withExpressionType(Explanation.ExpressionType.STREAM_SOURCE) |
| .withExpression("--non-expressible--"); |
| } |
| } |