FieldReader (Lucene 8.9.0 API)乐学网一站式学习平台

java.lang.Object
- org.apache.lucene.index.Terms
- - org.apache.lucene.codecs.blocktree.FieldReader

All Implemented Interfaces:

Accountable
```
public final class FieldReader
extends Terms
implements Accountable
```
BlockTree's implementation of Terms.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Field Summary
- Fields inherited from class org.apache.lucene.index.Terms
  EMPTY_ARRAY
- Fields inherited from interface org.apache.lucene.util.Accountable
  NULL_ACCOUNTABLE

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Collection<Accountable>`	`getChildResources()` Returns nested resources of this class.
`int`	`getDocCount()` Returns the number of documents that have at least one term for this field.
`BytesRef`	`getMax()` Returns the largest term (in lexicographic order) in the field.
`BytesRef`	`getMin()` Returns the smallest term (in lexicographic order) in the field.
`Stats`	`getStats()` For debugging -- used by CheckIndex too
`long`	`getSumDocFreq()` Returns the sum of `TermsEnum.docFreq()` for all terms in this field.
`long`	`getSumTotalTermFreq()` Returns the sum of `TermsEnum.totalTermFreq()` for all terms in this field.
`boolean`	`hasFreqs()` Returns true if documents in this field store per-document term frequency (`PostingsEnum.freq()`).
`boolean`	`hasOffsets()` Returns true if documents in this field store offsets.
`boolean`	`hasPayloads()` Returns true if documents in this field store payloads.
`boolean`	`hasPositions()` Returns true if documents in this field store positions.
`TermsEnum`	`intersect(CompiledAutomaton compiled, BytesRef startTerm)` Returns a TermsEnum that iterates over all terms and documents that are accepted by the provided `CompiledAutomaton`.
`TermsEnum`	`iterator()` Returns an iterator that will step through all terms.
`long`	`ramBytesUsed()` Return the memory usage of this object in bytes.
`long`	`size()` Returns the number of terms for this field, or -1 if this measure isn't stored by the codec.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Method Detail
  - getMin
```
public BytesRef getMin()
                throws IOException
```
    Description copied from class: Terms
    
    Returns the smallest term (in lexicographic order) in the field. Note that, just like other term measures, this measure does not take deleted documents into account. This returns null when there are no terms.
    
    Overrides:
    
    getMin in class Terms
    
    Throws:
    
    IOException
  - getMax
```
public BytesRef getMax()
                throws IOException
```
    Description copied from class: Terms
    
    Returns the largest term (in lexicographic order) in the field. Note that, just like other term measures, this measure does not take deleted documents into account. This returns null when there are no terms.
    
    Overrides:
    
    getMax in class Terms
    
    Throws:
    
    IOException
  - getStats
```
public Stats getStats()
               throws IOException
```
    For debugging -- used by CheckIndex too
    
    Overrides:
    
    getStats in class Terms
    
    Throws:
    
    IOException
  - hasFreqs
```
public boolean hasFreqs()
```
    Description copied from class: Terms
    
    Returns true if documents in this field store per-document term frequency (PostingsEnum.freq()).
    
    Specified by:
    
    hasFreqs in class Terms
  - hasOffsets
```
public boolean hasOffsets()
```
    Description copied from class: Terms
    
    Returns true if documents in this field store offsets.
    
    Specified by:
    
    hasOffsets in class Terms
  - hasPositions
```
public boolean hasPositions()
```
    Description copied from class: Terms
    
    Returns true if documents in this field store positions.
    
    Specified by:
    
    hasPositions in class Terms
  - hasPayloads
```
public boolean hasPayloads()
```
    Description copied from class: Terms
    
    Returns true if documents in this field store payloads.
    
    Specified by:
    
    hasPayloads in class Terms
  - iterator
```
public TermsEnum iterator()
                   throws IOException
```
    Description copied from class: Terms
    
    Returns an iterator that will step through all terms. This method will not return null.
    
    Specified by:
    
    iterator in class Terms
    
    Throws:
    
    IOException
  - size
```
public long size()
```
    Description copied from class: Terms
    
    Returns the number of terms for this field, or -1 if this measure isn't stored by the codec. Note that, just like other term measures, this measure does not take deleted documents into account.
    
    Specified by:
    
    size in class Terms
  - getSumTotalTermFreq
```
public long getSumTotalTermFreq()
```
    Description copied from class: Terms
    
    Returns the sum of TermsEnum.totalTermFreq() for all terms in this field. Note that, just like other term measures, this measure does not take deleted documents into account.
    
    Specified by:
    
    getSumTotalTermFreq in class Terms
  - getSumDocFreq
```
public long getSumDocFreq()
```
    Description copied from class: Terms
    
    Returns the sum of TermsEnum.docFreq() for all terms in this field. Note that, just like other term measures, this measure does not take deleted documents into account.
    
    Specified by:
    
    getSumDocFreq in class Terms
  - getDocCount
```
public int getDocCount()
```
    Description copied from class: Terms
    
    Returns the number of documents that have at least one term for this field. Note that, just like other term measures, this measure does not take deleted documents into account.
    
    Specified by:
    
    getDocCount in class Terms
  - intersect
```
public TermsEnum intersect(CompiledAutomaton compiled,
                           BytesRef startTerm)
                    throws IOException
```
    Description copied from class: Terms
    
    Returns a TermsEnum that iterates over all terms and documents that are accepted by the provided CompiledAutomaton. If the startTerm is provided then the returned enum will only return terms > startTerm, but you still must call next() first to get to the first term. Note that the provided startTerm must be accepted by the automaton.
    This is an expert low-level API and will only work for NORMAL compiled automata. To handle any compiled automata you should instead use CompiledAutomaton.getTermsEnum(org.apache.lucene.index.Terms) instead.
    NOTE: the returned TermsEnum cannot seek
    .
    
    Overrides:
    
    intersect in class Terms
    
    Throws:
    
    IOException
  - ramBytesUsed
```
public long ramBytesUsed()
```
    Description copied from interface: Accountable
    
    Return the memory usage of this object in bytes. Negative values are illegal.
    
    Specified by:
    
    ramBytesUsed in interface Accountable
  - getChildResources
```
public Collection<Accountable> getChildResources()
```
    Description copied from interface: Accountable
    
    Returns nested resources of this class. The result should be a point-in-time snapshot (to avoid race conditions).
    
    Specified by:
    
    getChildResources in interface Accountable
    
    See Also:
    
    Accountables
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class FieldReader

Field Summary

Fields inherited from class org.apache.lucene.index.Terms

Fields inherited from interface org.apache.lucene.util.Accountable

Method Summary

Methods inherited from class java.lang.Object

Method Detail

getMin

getMax

getStats

hasFreqs

hasOffsets

hasPositions

hasPayloads

iterator

size

getSumTotalTermFreq

getSumDocFreq

getDocCount

intersect

ramBytesUsed

getChildResources

toString