| /* |
| * 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.HashMap; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| import org.apache.solr.client.solrj.io.Tuple; |
| import org.apache.solr.client.solrj.io.comp.SingleValueComparator; |
| import org.apache.solr.client.solrj.io.comp.StreamComparator; |
| 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 7.1.0 |
| */ |
| public class PlotStream extends TupleStream implements Expressible { |
| |
| private static final long serialVersionUID = 1; |
| private StreamContext streamContext; |
| |
| private Map<String,String> stringParams = new HashMap<>(); |
| private Map<String,StreamEvaluator> evaluatorParams = new HashMap<>(); |
| private Map<String,TupleStream> streamParams = new HashMap<>(); |
| private List<String> fieldNames = new ArrayList<>(); |
| private Map<String, String> fieldLabels = new HashMap<>(); |
| |
| private boolean finished; |
| |
| public PlotStream(StreamExpression expression, StreamFactory factory) throws IOException { |
| |
| fieldNames.add("plot"); |
| fieldNames.add("data"); |
| fieldLabels.put("plot","plot"); |
| fieldLabels.put("data", "data"); |
| |
| List<StreamExpressionNamedParameter> namedParams = factory.getNamedOperands(expression); |
| //Get all the named params |
| for(StreamExpressionNamedParameter np : namedParams) { |
| String name = np.getName(); |
| //fieldNames.add(name); |
| //fieldLabels.put(name, name); |
| StreamExpressionParameter param = np.getParameter(); |
| |
| // we're going to split these up here so we only make the choice once |
| // order of these in read() doesn't matter |
| if(param instanceof StreamExpressionValue) { |
| stringParams.put(name, ((StreamExpressionValue)param).getValue()); |
| } else if (factory.isEvaluator((StreamExpression) param)) { |
| StreamEvaluator evaluator = factory.constructEvaluator((StreamExpression) param); |
| evaluatorParams.put(name, evaluator); |
| } else if(factory.isStream((StreamExpression)param)) { |
| TupleStream tupleStream = factory.constructStream((StreamExpression) param); |
| streamParams.put(name, tupleStream); |
| } |
| else{ |
| throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - only string, evaluator, or stream named parameters are supported, but param %d is none of those",expression, 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())); |
| |
| // add string based params |
| for(Entry<String,String> param : stringParams.entrySet()){ |
| expression.addParameter(new StreamExpressionNamedParameter(param.getKey(), param.getValue())); |
| } |
| |
| // add evaluator based params |
| for(Entry<String,StreamEvaluator> param : evaluatorParams.entrySet()){ |
| expression.addParameter(new StreamExpressionNamedParameter(param.getKey(), param.getValue().toExpression(factory))); |
| } |
| |
| // add stream based params |
| for(Entry<String,TupleStream> param : streamParams.entrySet()){ |
| if(includeStreams){ |
| expression.addParameter(new StreamExpressionNamedParameter(param.getKey(), ((Expressible)param.getValue()).toExpression(factory))); |
| } |
| else{ |
| expression.addParameter(new StreamExpressionNamedParameter(param.getKey(), "<stream>")); |
| } |
| } |
| |
| 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()); |
| |
| return explanation; |
| } |
| |
| public void setStreamContext(StreamContext context) { |
| this.streamContext = context; |
| |
| // also set in evalators and streams |
| for(StreamEvaluator evaluator : evaluatorParams.values()){ |
| evaluator.setStreamContext(context); |
| } |
| |
| for(TupleStream stream : streamParams.values()){ |
| stream.setStreamContext(context); |
| } |
| } |
| |
| public List<TupleStream> children() { |
| List<TupleStream> l = new ArrayList<TupleStream>(); |
| return l; |
| } |
| |
| @SuppressWarnings({"unchecked"}) |
| public Tuple read() throws IOException { |
| |
| if (finished) { |
| return Tuple.EOF(); |
| } else { |
| finished = true; |
| Map<String, Object> values = new HashMap<>(); |
| |
| // add all string based params |
| // these could come from the context, or they will just be treated as straight strings |
| for(Entry<String,String> param : stringParams.entrySet()){ |
| if(streamContext.getLets().containsKey(param.getValue())){ |
| values.put(param.getKey(), streamContext.getLets().get(param.getValue())); |
| } |
| else{ |
| values.put(param.getKey(), param.getValue()); |
| } |
| } |
| |
| // add all evaluators |
| for(Entry<String,StreamEvaluator> param : evaluatorParams.entrySet()){ |
| values.put(param.getKey(), param.getValue().evaluateOverContext()); |
| } |
| |
| List<Number> y = (List<Number>)values.get("y"); |
| List<Number> x = (List<Number>)values.get("x"); |
| |
| if(x == null) { |
| //x is null so add a sequence |
| x = new ArrayList<>(); |
| for(int i=0; i<y.size(); i++) { |
| x.add(i+1); |
| } |
| } |
| |
| List<List<Number>> xy = new ArrayList<>(); |
| for(int i=0; i<x.size(); i++) { |
| List<Number> pair = new ArrayList<>(); |
| pair.add(x.get(i)); |
| pair.add(y.get(i)); |
| xy.add(pair); |
| } |
| |
| values.put("plot", values.get("type")); |
| values.put("data", xy); |
| |
| Tuple tup = new Tuple(values); |
| tup.setFieldLabels(fieldLabels); |
| tup.setFieldNames(fieldNames); |
| return tup; |
| } |
| } |
| |
| public void close() throws IOException { |
| // Nothing to do here |
| } |
| |
| public void open() throws IOException { |
| // nothing to do here |
| } |
| |
| /** Return the stream sort - ie, the order in which records are returned */ |
| public StreamComparator getStreamSort(){ |
| return new SingleValueComparator(); |
| } |
| |
| public int getCost() { |
| return 0; |
| } |
| |
| |
| } |