Example usage for org.apache.lucene.index LeafReader getCoreCacheHelper

Introduction

In this page you can find the example usage for org.apache.lucene.index LeafReader getCoreCacheHelper.

Prototype

public abstract CacheHelper getCoreCacheHelper();

Source Link

Document

Optional method: Return a IndexReader.CacheHelper that can be used to cache based on the content of this leaf regardless of deletions.

Usage

From source file:org.elasticsearch.common.lucene.uid.PerThreadIDVersionAndSeqNoLookup.java

License:Apache License

/**
 * Initialize lookup for the provided segment
 *//*from w  ww .j a v a  2s.  c o  m*/
PerThreadIDVersionAndSeqNoLookup(LeafReader reader, String uidField) throws IOException {
    this.uidField = uidField;
    Terms terms = reader.terms(uidField);
    if (terms == null) {
        throw new IllegalArgumentException("reader misses the [" + uidField + "] field");
    }
    termsEnum = terms.iterator();
    if (reader.getNumericDocValues(VersionFieldMapper.NAME) == null) {
        throw new IllegalArgumentException("reader misses the [" + VersionFieldMapper.NAME + "] field");
    }

    Object readerKey = null;
    assert (readerKey = reader.getCoreCacheHelper().getKey()) != null;
    this.readerKey = readerKey;
}

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