org.apache.lucene.index
Class SegmentInfo

java.lang.Object
  extended by org.apache.lucene.index.SegmentInfo

public final class SegmentInfo
extends Object

Information about a segment such as it's name, directory, and files related to the segment.

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

Field Summary
 Directory dir
          Where this segment resides.
 String name
          Unique segment name in the directory.
static int NO
          Used by some member fields to mean not present (e.g., norms, deletions).
static int YES
          Used by some member fields to mean present (e.g., norms, deletions).
 
Constructor Summary
SegmentInfo(Directory dir, String version, String name, int docCount, boolean isCompoundFile, Codec codec, Map<String,String> diagnostics)
          Construct a new complete SegmentInfo instance from input.
SegmentInfo(Directory dir, String version, String name, int docCount, boolean isCompoundFile, Codec codec, Map<String,String> diagnostics, Map<String,String> attributes)
          Construct a new complete SegmentInfo instance from input.
 
Method Summary
 void addFile(String file)
          Add this file to the set of files written for this segment.
 void addFiles(Collection<String> files)
          Add these files to the set of files written for this segment.
 Map<String,String> attributes()
          Deprecated. no longer supported
 boolean equals(Object obj)
          We consider another SegmentInfo instance equal if it has the same dir and same name.
 Set<String> files()
          Return all files referenced by this SegmentInfo.
 String getAttribute(String key)
          Deprecated. no longer supported
 Codec getCodec()
          Return Codec that wrote this segment.
 Map<String,String> getDiagnostics()
          Returns diagnostics saved into the segment when it was written.
 int getDocCount()
          Returns number of documents in this segment (deletions are not taken into account).
 boolean getUseCompoundFile()
          Returns true if this segment is stored as a compound file; else, false.
 String getVersion()
          Returns the version of the code which wrote the segment.
 int hashCode()
           
 String putAttribute(String key, String value)
          Deprecated. no longer supported
 void setCodec(Codec codec)
          Can only be called once.
 void setFiles(Set<String> files)
          Sets the files written for this segment.
 void setVersion(String version)
          Used by DefaultSegmentInfosReader to upgrade a 3.0 segment to record its version is "3.0".
 String toString()
           
 String toString(Directory dir, int delCount)
          Used for debugging.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

NO

public static final int NO
Used by some member fields to mean not present (e.g., norms, deletions).

See Also:
Constant Field Values

YES

public static final int YES
Used by some member fields to mean present (e.g., norms, deletions).

See Also:
Constant Field Values

name

public final String name
Unique segment name in the directory.


dir

public final Directory dir
Where this segment resides.

Constructor Detail

SegmentInfo

public SegmentInfo(Directory dir,
                   String version,
                   String name,
                   int docCount,
                   boolean isCompoundFile,
                   Codec codec,
                   Map<String,String> diagnostics)
Construct a new complete SegmentInfo instance from input.

Note: this is public only to allow access from the codecs package.


SegmentInfo

public SegmentInfo(Directory dir,
                   String version,
                   String name,
                   int docCount,
                   boolean isCompoundFile,
                   Codec codec,
                   Map<String,String> diagnostics,
                   Map<String,String> attributes)
Construct a new complete SegmentInfo instance from input.

Note: this is public only to allow access from the codecs package.

Method Detail

getDiagnostics

public Map<String,String> getDiagnostics()
Returns diagnostics saved into the segment when it was written.


getUseCompoundFile

public boolean getUseCompoundFile()
Returns true if this segment is stored as a compound file; else, false.


setCodec

public void setCodec(Codec codec)
Can only be called once.


getCodec

public Codec getCodec()
Return Codec that wrote this segment.


getDocCount

public int getDocCount()
Returns number of documents in this segment (deletions are not taken into account).


files

public Set<String> files()
Return all files referenced by this SegmentInfo.


toString

public String toString()
Overrides:
toString in class Object

toString

public String toString(Directory dir,
                       int delCount)
Used for debugging. Format may suddenly change.

Current format looks like _a(3.1):c45/4, which means the segment's name is _a; it was created with Lucene 3.1 (or '?' if it's unknown); it's using compound file format (would be C if not compound); it has 45 documents; it has 4 deletions (this part is left off when there are no deletions).


equals

public boolean equals(Object obj)
We consider another SegmentInfo instance equal if it has the same dir and same name.

Overrides:
equals in class Object

hashCode

public int hashCode()
Overrides:
hashCode in class Object

setVersion

public void setVersion(String version)
Used by DefaultSegmentInfosReader to upgrade a 3.0 segment to record its version is "3.0". This method can be removed when we're not required to support 3x indexes anymore, e.g. in 5.0.

NOTE: this method is used for internal purposes only - you should not modify the version of a SegmentInfo, or it may result in unexpected exceptions thrown when you attempt to open the index.

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

getVersion

public String getVersion()
Returns the version of the code which wrote the segment.


setFiles

public void setFiles(Set<String> files)
Sets the files written for this segment.


addFiles

public void addFiles(Collection<String> files)
Add these files to the set of files written for this segment.


addFile

public void addFile(String file)
Add this file to the set of files written for this segment.


getAttribute

@Deprecated
public String getAttribute(String key)
Deprecated. no longer supported

Get a codec attribute value, or null if it does not exist


putAttribute

@Deprecated
public String putAttribute(String key,
                                      String value)
Deprecated. no longer supported

Puts a codec attribute value.

This is a key-value mapping for the field that the codec can use to store additional metadata, and will be available to the codec when reading the segment via getAttribute(String)

If a value already exists for the field, it will be replaced with the new value.


attributes

@Deprecated
public Map<String,String> attributes()
Deprecated. no longer supported

Returns the internal codec attributes map.

Returns:
internal codec attributes map. May be null if no mappings exist.


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