Example usage for org.apache.solr.client.solrj.io.stream.expr StreamFactory getNamedOperands

Introduction

In this page you can find the example usage for org.apache.solr.client.solrj.io.stream.expr StreamFactory getNamedOperands.

Prototype

public List<StreamExpressionNamedParameter> getNamedOperands(StreamExpression expression) 

Source Link

Usage

From source file:com.dennisgove.streaming.expressions.kafka.KafkaTopicConsumerStream.java

License:Apache License

/**
 * Accepts a valid {@link StreamExpression} adhering to the form above and constructs
 * a new instance of the KafkaTopicConsumerStream.
 *
 * @param expression A valid kafkaConsume {@link StreamExpression}
 * @param factory A valid {@link StreamFactory}
 * @throws IOException If unable to parse or deal with the incoming expression
 *///from www  .j a v a 2  s  .c o m
public KafkaTopicConsumerStream(StreamExpression expression, StreamFactory factory) throws IOException {
    String bootstrapServers = getStringParameter("bootstrapServers", expression, factory);
    String groupId = getStringParameter("groupId", expression, factory);
    String topic = getStringParameter("topic", expression, factory);
    //    List<String> partitions = getMultiStringParameter("partitions", expression, factory);

    Map<String, String> otherParams = new HashMap<>();
    for (StreamExpressionNamedParameter param : factory.getNamedOperands(expression).stream()
            .filter(item -> !knownParameters.contains(item.getName())).collect(Collectors.toList())) {
        if (param.getParameter() instanceof StreamExpressionValue) {
            otherParams.put(param.getName(), ((StreamExpressionValue) param.getParameter()).getValue());
        }
    }

    if (null == bootstrapServers) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid %s expressions '%s' - expecting a list of bootstrapServers but found none",
                factory.getFunctionName(getClass()), expression));
    }

    if (null == topic) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid %s expressions '%s' - expecting a single topic but found none",
                factory.getFunctionName(getClass()), expression));
    }

    this.bootstrapServers = bootstrapServers;
    this.otherConsumerParams = otherParams;
    this.groupId = groupId;
    this.topic = topic;
    //    this.partitions = partitions;
}

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From source file:com.dennisgove.streaming.expressions.kafka.KafkaTopicConsumerStream.java

License:Apache License

private List<String> getMultiStringParameter(String paramName, StreamExpression expression,
        StreamFactory factory) {
    List<String> values = new ArrayList<>();

    for (StreamExpressionNamedParameter param : factory.getNamedOperands(expression)) {
        if (param.getName().equals(paramName) && param.getParameter() instanceof StreamExpressionValue) {
            String value = ((StreamExpressionValue) param.getParameter()).getValue();
            for (String part : value.split(",")) {
                part = part.trim();//from  w  ww.  j a  v a2s . com
                if (part.length() > 0) {
                    values.add(part);
                }
            }
        }
    }

    return values;
}

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