Package org.apache.lucene.codecs

Class StoredFieldsWriter

java.lang.Object

org.apache.lucene.codecs.StoredFieldsWriter

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

CompressingStoredFieldsWriter

public abstract class StoredFieldsWriter
extends Object
implements Closeable

Codec API for writing stored fields:

1. For every document, startDocument() is called, informing the Codec that a new document has started.
2. writeField(FieldInfo, IndexableField) is called for each field in the document.
3. After all documents have been written, finish(FieldInfos, int) is called for verification/sanity-checks.
4. Finally the writer is closed (close())

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

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	StoredFieldsWriter.MergeVisitor	A visitor that adds every field it sees.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	StoredFieldsWriter()	Sole constructor.

Method Summary

Modifier and Type	Method	Description
abstract void	close()
abstract void	finish(FieldInfos fis, int numDocs)	Called before close(), passing in the number of documents that were written.
void	finishDocument()	Called when a document and all its fields have been added.
int	merge(MergeState mergeState)	Merges in the stored fields from the readers in mergeState.
abstract void	startDocument()	Called before writing the stored fields of the document.
abstract void	writeField(FieldInfo info, IndexableField field)	Writes a single stored field.

Methods inherited from class java.lang.Object

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

Constructor Detail

StoredFieldsWriter

protected StoredFieldsWriter()

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

Method Detail

startDocument

public abstract void startDocument()
                            throws IOException

Called before writing the stored fields of the document. writeField(FieldInfo, IndexableField) will be called for each stored field. Note that this is called even if the document has no stored fields.

Throws:

IOException

finishDocument

public void finishDocument()
                    throws IOException

Called when a document and all its fields have been added.

Throws:

IOException

writeField

public abstract void writeField(FieldInfo info,
                                IndexableField field)
                         throws IOException

Writes a single stored field.

Throws:

IOException

finish

public abstract void finish(FieldInfos fis,
                            int numDocs)
                     throws IOException

Called before close(), passing in the number of documents that were written. Note that this is intentionally redundant (equivalent to the number of calls to startDocument(), but a Codec should check that this is the case to detect the JRE bug described in LUCENE-1282.

Throws:

IOException

merge

public int merge(MergeState mergeState)
          throws IOException

Merges in the stored fields from the readers in mergeState. The default implementation skips over deleted documents, and uses startDocument(), writeField(FieldInfo, IndexableField), and finish(FieldInfos, int), returning the number of documents that were written. Implementations can override this method for more sophisticated merging (bulk-byte copying, etc).

Throws:

IOException

close

public abstract void close()
                    throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException