Package org.apache.lucene.codecs

Class FieldsConsumer

java.lang.Object

org.apache.lucene.codecs.FieldsConsumer

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

BlockTreeTermsWriter

public abstract class FieldsConsumer
extends Object
implements Closeable

Abstract API that consumes terms, doc, freq, prox, offset and payloads postings. Concrete implementations of this actually do "something" with the postings (write it into the index in a specific format).

The lifecycle is:

1. FieldsConsumer is created by PostingsFormat.fieldsConsumer(SegmentWriteState).
2. For each field, addField(FieldInfo) is called, returning a TermsConsumer for the field.
3. After all fields are added, the consumer is close()d.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FieldsConsumer()	Sole constructor.

Method Summary

Modifier and Type	Method	Description
abstract TermsConsumer	addField(FieldInfo field)	Add a new field
abstract void	close()	Called when we are done adding everything.
void	merge(MergeState mergeState, Fields fields)	Called during merging to merge all Fields from sub-readers.

Methods inherited from class java.lang.Object

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

Constructor Details

FieldsConsumer

protected FieldsConsumer()

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

Method Details

addField

public abstract TermsConsumer addField(FieldInfo field)
                                throws IOException

Add a new field

Throws:

IOException

close

public abstract void close()
                    throws IOException

Called when we are done adding everything.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException

merge

public void merge(MergeState mergeState,
 Fields fields)
           throws IOException

Called during merging to merge all Fields from sub-readers. This must recurse to merge all postings (terms, docs, positions, etc.). A PostingsFormat can override this default implementation to do its own merging.

Throws:

IOException