| /* |
| * 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.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.HashSet; |
| |
| |
| import org.apache.solr.client.solrj.io.Tuple; |
| import org.apache.solr.client.solrj.io.comp.StreamComparator; |
| import org.apache.solr.client.solrj.io.eval.MemsetEvaluator; |
| import org.apache.solr.client.solrj.io.eval.StreamEvaluator; |
| 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.StreamExpressionNamedParameter; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionParameter; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionValue; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamFactory; |
| |
| /** |
| * @since 6.6.0 |
| */ |
| public class LetStream extends TupleStream implements Expressible { |
| |
| private static final long serialVersionUID = 1; |
| private TupleStream stream; |
| private StreamContext streamContext; |
| @SuppressWarnings({"rawtypes"}) |
| private Map letParams = new LinkedHashMap(); |
| |
| @SuppressWarnings({"unchecked", "rawtypes"}) |
| public LetStream(StreamExpression expression, StreamFactory factory) throws IOException { |
| List<StreamExpression> streamExpressions = factory.getExpressionOperandsRepresentingTypes(expression, Expressible.class, TupleStream.class); |
| |
| List<StreamExpressionNamedParameter> namedParams = factory.getNamedOperands(expression); |
| //Get all the named params |
| Set<String> echo = null; |
| boolean echoAll = false; |
| String currentName = null; |
| for(StreamExpressionParameter np : namedParams) { |
| String name = ((StreamExpressionNamedParameter)np).getName(); |
| currentName = name; |
| |
| if(name.equals("echo")) { |
| echo = new HashSet(); |
| String echoString = ((StreamExpressionNamedParameter) np).getParameter().toString().trim(); |
| if(echoString.equalsIgnoreCase("true")) { |
| echoAll = true; |
| } else { |
| String[] echoVars = echoString.split(","); |
| for (String echoVar : echoVars) { |
| echo.add(echoVar.trim()); |
| } |
| } |
| |
| continue; |
| } |
| |
| StreamExpressionParameter param = ((StreamExpressionNamedParameter)np).getParameter(); |
| |
| if(param instanceof StreamExpressionValue) { |
| String paramValue = ((StreamExpressionValue) param).getValue(); |
| letParams.put(name, factory.constructPrimitiveObject(paramValue)); |
| } else if(factory.isEvaluator((StreamExpression)param)) { |
| StreamEvaluator evaluator = factory.constructEvaluator((StreamExpression) param); |
| letParams.put(name, evaluator); |
| } else { |
| TupleStream tupleStream = factory.constructStream((StreamExpression) param); |
| letParams.put(name, tupleStream); |
| } |
| } |
| |
| if(streamExpressions.size() > 0) { |
| stream = factory.constructStream(streamExpressions.get(0)); |
| } else { |
| StreamExpression tupleExpression = new StreamExpression("tuple"); |
| if(!echoAll && echo == null) { |
| tupleExpression.addParameter(new StreamExpressionNamedParameter(currentName, currentName)); |
| } else { |
| Set<String> names = letParams.keySet(); |
| for(String name : names) { |
| if(echoAll) { |
| tupleExpression.addParameter(new StreamExpressionNamedParameter(name, name)); |
| } else { |
| if(echo.contains(name)) { |
| tupleExpression.addParameter(new StreamExpressionNamedParameter(name, name)); |
| } |
| } |
| } |
| } |
| |
| stream = factory.constructStream(tupleExpression); |
| } |
| } |
| |
| |
| @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(((Expressible) stream).toExpression(factory)); |
| |
| 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_DECORATOR); |
| explanation.setExpression(toExpression(factory, false).toString()); |
| explanation.addChild(stream.toExplanation(factory)); |
| |
| return explanation; |
| } |
| |
| public void setStreamContext(StreamContext context) { |
| this.streamContext = context; |
| this.stream.setStreamContext(context); |
| } |
| |
| public List<TupleStream> children() { |
| List<TupleStream> l = new ArrayList<TupleStream>(); |
| l.add(stream); |
| |
| return l; |
| } |
| |
| public Tuple read() throws IOException { |
| return stream.read(); |
| } |
| |
| public void close() throws IOException { |
| stream.close(); |
| } |
| |
| @SuppressWarnings({"unchecked"}) |
| public void open() throws IOException { |
| Map<String, Object> lets = streamContext.getLets(); |
| Set<Map.Entry<String, Object>> entries = letParams.entrySet(); |
| |
| //Load up the StreamContext with the data created by the letParams. |
| for(Map.Entry<String, Object> entry : entries) { |
| String name = entry.getKey(); |
| Object o = entry.getValue(); |
| if(o instanceof TupleStream) { |
| List<Tuple> tuples = new ArrayList<>(); |
| TupleStream tStream = (TupleStream)o; |
| tStream.setStreamContext(streamContext); |
| try { |
| tStream.open(); |
| TUPLES: |
| while(true) { |
| Tuple tuple = tStream.read(); |
| if (tuple.EOF) { |
| break TUPLES; |
| } else { |
| tuples.add(tuple); |
| } |
| } |
| lets.put(name, tuples); |
| } finally { |
| tStream.close(); |
| } |
| } else if(o instanceof StreamEvaluator) { |
| //Add the data from the StreamContext to a tuple. |
| //Let the evaluator works from this tuple. |
| //This will allow columns to be created from tuples already in the StreamContext. |
| Tuple eTuple = new Tuple(lets); |
| StreamEvaluator evaluator = (StreamEvaluator)o; |
| evaluator.setStreamContext(streamContext); |
| Object eo = evaluator.evaluate(eTuple); |
| if(evaluator instanceof MemsetEvaluator) { |
| @SuppressWarnings({"rawtypes"}) |
| Map mem = (Map)eo; |
| lets.putAll(mem); |
| } else { |
| lets.put(name, eo); |
| } |
| } else { |
| lets.put(name, o); |
| } |
| } |
| stream.open(); |
| } |
| |
| /** Return the stream sort - ie, the order in which records are returned */ |
| public StreamComparator getStreamSort(){ |
| return null; |
| } |
| |
| public int getCost() { |
| return 0; |
| } |
| |
| |
| } |