FieldReader (Lucene 4.10.3 API)

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.

Field Summary
- Fields inherited from class org.apache.lucene.index.Terms
  EMPTY_ARRAY

Method Summary

Methods
Modifier and Type	Method and Description
`Stats`	`computeStats()` For debugging -- used by CheckIndex too
`Comparator<BytesRef>`	`getComparator()` Return the BytesRef Comparator used to sort terms provided by the iterator.
`int`	`getDocCount()` Returns the number of documents that have at least one term for this field, or -1 if this measure isn't stored by the codec.
`BytesRef`	`getMax()` Returns the largest term (in lexicographic order) in the field.
`BytesRef`	`getMin()` Returns the smallest term (in lexicographic order) in the field.
`long`	`getSumDocFreq()` Returns the sum of `TermsEnum.docFreq()` for all terms in this field, or -1 if this measure isn't stored by the codec.
`long`	`getSumTotalTermFreq()` Returns the sum of `TermsEnum.totalTermFreq()` for all terms in this field, or -1 if this measure isn't stored by the codec (or if this fields omits term freq and positions).
`boolean`	`hasFreqs()` Returns true if documents in this field store per-document term frequency (`DocsEnum.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 that are accepted by the provided `CompiledAutomaton`.
`TermsEnum`	`iterator(TermsEnum reuse)` 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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, 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
  - computeStats
```
public Stats computeStats()
                   throws IOException
```
    For debugging -- used by CheckIndex too
    
    Throws:
    
    IOException
  - getComparator
```
public Comparator<BytesRef> getComparator()
```
    Description copied from class: Terms
    
    Return the BytesRef Comparator used to sort terms provided by the iterator. This method may return null if there are no terms. This method may be invoked many times; it's best to cache a single instance & reuse it.
    
    Specified by:
    
    getComparator in class Terms
  - hasFreqs
```
public boolean hasFreqs()
```
    Description copied from class: Terms
    
    Returns true if documents in this field store per-document term frequency (DocsEnum.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(TermsEnum reuse)
                   throws IOException
```
    Description copied from class: Terms
    
    Returns an iterator that will step through all terms. This method will not return null. If you have a previous TermsEnum, for example from a different field, you can pass it for possible reuse if the implementation can do so.
    
    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, or -1 if this measure isn't stored by the codec (or if this fields omits term freq and positions). 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, 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:
    
    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, 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:
    
    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 that are accepted by the provided CompiledAutomaton. If the startTerm is provided then the returned enum will only accept 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.
    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

Class FieldReader

Field Summary

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

Method Summary

Methods inherited from class java.lang.Object

Method Detail

getMin

getMax

computeStats

getComparator

hasFreqs

hasOffsets

hasPositions

hasPayloads

iterator

size

getSumTotalTermFreq

getSumDocFreq

getDocCount

intersect

ramBytesUsed