Package org.elasticsearch.index.mapper
Class DocValueFetcher
java.lang.Object
org.elasticsearch.index.mapper.DocValueFetcher
- All Implemented Interfaces:
ValueFetcher
public final class DocValueFetcher extends java.lang.Object implements ValueFetcher
Value fetcher that loads from doc values.
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Nested Class Summary
Nested Classes Modifier and Type Class Description static interface
DocValueFetcher.Leaf
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Constructor Summary
Constructors Constructor Description DocValueFetcher(DocValueFormat format, IndexFieldData<?> ifd)
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Method Summary
Modifier and Type Method Description java.util.List<java.lang.Object>
fetchValues(SourceLookup lookup)
Given access to a document's _source, return this field's values.void
setNextReader(org.apache.lucene.index.LeafReaderContext context)
Update the leaf reader used to fetch values.
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Constructor Details
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Method Details
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setNextReader
public void setNextReader(org.apache.lucene.index.LeafReaderContext context)Description copied from interface:ValueFetcher
Update the leaf reader used to fetch values.- Specified by:
setNextReader
in interfaceValueFetcher
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fetchValues
public java.util.List<java.lang.Object> fetchValues(SourceLookup lookup) throws java.io.IOExceptionDescription copied from interface:ValueFetcher
Given access to a document's _source, return this field's values. In addition to pulling out the values, they will be parsed into a standard form. For example numeric field mappers make sure to parse the source value into a number of the right type. Note that for array values, the order in which values are returned is undefined and should not be relied on.- Specified by:
fetchValues
in interfaceValueFetcher
- Parameters:
lookup
- a lookup structure over the document's source.- Returns:
- a list a standardized field values.
- Throws:
java.io.IOException
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