org.apache.lucene.codecs
Class PerDocProducerBase

java.lang.Object
  org.apache.lucene.codecs.PerDocProducer
      org.apache.lucene.codecs.PerDocProducerBase

All Implemented Interfaces:

Closeable

Direct Known Subclasses:

Lucene40DocValuesProducer

public abstract class PerDocProducerBase
extends PerDocProducer

Abstract base class for PerDocProducer implementations

WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary

protected

PerDocProducerBase() Sole constructor.

Method Summary

protected boolean	anyDocValuesFields(FieldInfos infos) Returns true if any fields indexed doc values.
protected boolean	canLoad(FieldInfo info) Returns true if this field indexed doc values.
void	close()
protected abstract void	closeInternal(Collection<? extends Closeable> closeables) Closes provided Closables.
protected abstract Map<String,DocValues>	docValues() Returns a map, mapping field names to doc values.
DocValues	docValues(String field) Returns DocValues for the current field.
static String	docValuesId(String segmentsName, int fieldId) Returns the unique segment and field id for any per-field files this implementation needs to write.
Comparator<BytesRef>	getComparator() Returns the comparator used to sort BytesRef values.
protected DocValues.Type	getDocValuesType(FieldInfo info) Returns the doc values type for this field.
protected TreeMap<String,DocValues>	load(FieldInfos fieldInfos, String segment, int docCount, Directory dir, IOContext context) Only opens files...
protected abstract DocValues	loadDocValues(int docCount, Directory dir, String id, DocValues.Type type, IOContext context) Loads a DocValues instance depending on the given DocValues.Type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PerDocProducerBase

protected PerDocProducerBase()

Sole constructor. (For invocation by subclass constructors, typically implicit.)

Method Detail

closeInternal

protected abstract void closeInternal(Collection<? extends Closeable> closeables)
                               throws IOException

Closes provided Closables.

Throws:

IOException

docValues

protected abstract Map<String,DocValues> docValues()

Returns a map, mapping field names to doc values.

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in class PerDocProducer

Throws:

IOException

docValues

public DocValues docValues(String field)
                    throws IOException

Description copied from class: PerDocProducer

Returns DocValues for the current field.

Specified by:

docValues in class PerDocProducer

Parameters:

field - the field name

Returns:

the DocValues for this field or null if not applicable.

Throws:

IOException - If an I/O error occurs

getComparator

public Comparator<BytesRef> getComparator()
                                   throws IOException

Returns the comparator used to sort BytesRef values.

Throws:

IOException

load

protected TreeMap<String,DocValues> load(FieldInfos fieldInfos,
                                         String segment,
                                         int docCount,
                                         Directory dir,
                                         IOContext context)
                                  throws IOException

Only opens files... doesn't actually load any values.

Throws:

IOException

canLoad

protected boolean canLoad(FieldInfo info)

Returns true if this field indexed doc values.

getDocValuesType

protected DocValues.Type getDocValuesType(FieldInfo info)

Returns the doc values type for this field.

anyDocValuesFields

protected boolean anyDocValuesFields(FieldInfos infos)

Returns true if any fields indexed doc values.

docValuesId

public static String docValuesId(String segmentsName,
                                 int fieldId)

Returns the unique segment and field id for any per-field files this implementation needs to write.

loadDocValues

protected abstract DocValues loadDocValues(int docCount,
                                           Directory dir,
                                           String id,
                                           DocValues.Type type,
                                           IOContext context)
                                    throws IOException

Loads a DocValues instance depending on the given DocValues.Type. Codecs that use different implementations for a certain DocValues.Type can simply override this method and return their custom implementations.

Parameters:

docCount - number of documents in the segment

dir - the Directory to load the DocValues from

id - the unique file ID within the segment

type - the type to load

Returns:

a DocValues instance for the given type

Throws:

IOException - if an IOException occurs

IllegalArgumentException - if the given DocValues.Type is not supported