Example usage for org.apache.solr.common.util StrUtils join

Introduction

In this page you can find the example usage for org.apache.solr.common.util StrUtils join.

Prototype

public static String join(Collection<?> items, char separator) 

Source Link

Document

Creates a backslash escaped string, joining all the items.

Usage

From source file:edu.harvard.gis.hhypermap.bop.solrplugins.DateShardRoutingSearchHandler.java

License:Apache License

private void addShardsParamIfWeCan(SolrQueryRequest req) {
    CoreDescriptor coreDescriptor = req.getCore().getCoreDescriptor();
    CoreContainer coreContainer = coreDescriptor.getCoreContainer();
    if (!coreContainer.isZooKeeperAware()) {
        return;//from w ww.jav  a  2  s .c om
    }
    if (!req.getParams().getBool("distrib", true)) {
        return;
    }
    final String shards = req.getParams().get(ShardParams.SHARDS);
    if (shards != null) {
        return; // we already have the shards
    }

    String startStrParam = req.getParams().get(START_PARAM);
    String endStrParam = req.getParams().get(END_PARAM);

    Instant startInst = // null means open-ended ('*')
            startStrParam == null ? null : DateMathParser.parseMath(null, startStrParam).toInstant();
    Instant endInst = endStrParam == null ? null : DateMathParser.parseMath(null, endStrParam).toInstant();

    if (startInst == null && endInst == null) {
        return;
    }

    ZkController zkController = coreContainer.getZkController();
    String collection = req.getParams().get("collection", coreDescriptor.getCollectionName());
    List<Slice> slices = getOrderedSlices(zkController, collection);
    if (slices.size() <= 1) {
        return;
    }

    List<String> routeShardNames = new ArrayList<>(); // the result
    boolean findingStart = (startInst != null);
    String prevShardName = null;
    Instant prevShardStartKey = null;

    for (Slice slice : slices) {
        String name = slice.getName();
        Instant shardStartKey = parseStartKeyFromShardName(name);
        if (prevShardStartKey != null && prevShardStartKey.isAfter(shardStartKey)) {
            throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "shards not in order? " + slice);
        }
        if (findingStart) {
            // As we advance shards, is this one finally > the 'start'? If so, accept it.
            if (shardStartKey.isAfter(startInst)) {
                if (prevShardName != null) {
                    routeShardNames.add(prevShardName);
                }
                findingStart = false; // thus findingEnd
            }
        }
        if (!findingStart && endInst == null) { // take all the remainder since 'end' is null
            routeShardNames.add(name);
        } else if (!findingStart) { // findingEnd
            if (shardStartKey.isAfter(endInst)) {
                break;
            }
            routeShardNames.add(name);
        }

        prevShardName = name;
        prevShardStartKey = shardStartKey;
    }
    if (findingStart) {
        routeShardNames.add(prevShardName);
    }

    if (routeShardNames.size() == slices.size()) {
        return;
    }

    ModifiableSolrParams params = new ModifiableSolrParams(req.getParams());
    String shardsValue = StrUtils.join(routeShardNames, ',');
    params.set(ShardParams.SHARDS, shardsValue);
    req.setParams(params);
    log.debug("Set shards: {}", shardsValue);
}

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