Package org.apache.lucene.analysis

Class NumericTokenStream.NumericTermAttributeImpl

java.lang.Object

org.apache.lucene.util.AttributeImpl

org.apache.lucene.analysis.NumericTokenStream.NumericTermAttributeImpl

All Implemented Interfaces:

Cloneable, NumericTokenStream.NumericTermAttribute, TermToBytesRefAttribute, Attribute

Enclosing class:

NumericTokenStream

public static final class NumericTokenStream.NumericTermAttributeImpl
extends AttributeImpl
implements NumericTokenStream.NumericTermAttribute, TermToBytesRefAttribute

Implementation of NumericTokenStream.NumericTermAttribute.

Since:

4.0

Constructor Summary

Constructors

Constructor	Description
NumericTermAttributeImpl()	Creates, but does not yet initialize this attribute instance

Method Summary

Modifier and Type	Method	Description
void	clear()	Clears the values in this AttributeImpl and resets it to its default value.
void	copyTo(AttributeImpl target)	Copies the values from this Attribute into the passed-in target attribute.
int	fillBytesRef()	Updates the bytes TermToBytesRefAttribute.getBytesRef() to contain this term's final encoding, and returns its hashcode.
BytesRef	getBytesRef()	Retrieve this attribute's BytesRef.
long	getRawValue()	Returns current token's raw value as long with all NumericTokenStream.NumericTermAttribute.getShift() applied, undefined before first token
int	getShift()	Returns current shift value, undefined before first token
int	getValueSize()	Returns value size in bits (32 for float, int; 64 for double, long)
int	incShift()	Don't call this method!
void	init(long value, int valueSize, int precisionStep, int shift)	Don't call this method!
void	reflectWith(AttributeReflector reflector)	This method is for introspection of attributes, it should simply add the key/values this attribute holds to the given AttributeReflector.
void	setShift(int shift)	Don't call this method!

Methods inherited from class org.apache.lucene.util.AttributeImpl

clone, reflectAsString

Methods inherited from class java.lang.Object

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

Constructor Detail

NumericTermAttributeImpl

public NumericTermAttributeImpl()

Creates, but does not yet initialize this attribute instance

See Also:

init(long, int, int, int)

Method Detail

getBytesRef

public BytesRef getBytesRef()

Description copied from interface: TermToBytesRefAttribute

Retrieve this attribute's BytesRef. The bytes are updated from the current term when the consumer calls TermToBytesRefAttribute.fillBytesRef().

Specified by:

getBytesRef in interface TermToBytesRefAttribute

Returns:

this Attributes internal BytesRef.

fillBytesRef

public int fillBytesRef()

Description copied from interface: TermToBytesRefAttribute

Updates the bytes TermToBytesRefAttribute.getBytesRef() to contain this term's final encoding, and returns its hashcode.

Specified by:

fillBytesRef in interface TermToBytesRefAttribute

Returns:

the hashcode as defined by BytesRef.hashCode():

  int hash = 0;
  for (int i = termBytes.offset; i < termBytes.offset+termBytes.length; i++) {
    hash = 31*hash + termBytes.bytes[i];
  }
 

Implement this for performance reasons, if your code can calculate the hash on-the-fly. If this is not the case, just return termBytes.hashCode().

getShift

public int getShift()

Description copied from interface: NumericTokenStream.NumericTermAttribute

Returns current shift value, undefined before first token

Specified by:

getShift in interface NumericTokenStream.NumericTermAttribute

setShift

public void setShift(int shift)

Description copied from interface: NumericTokenStream.NumericTermAttribute

Don't call this method!

Specified by:

setShift in interface NumericTokenStream.NumericTermAttribute

incShift

public int incShift()

Description copied from interface: NumericTokenStream.NumericTermAttribute

Don't call this method!

Specified by:

incShift in interface NumericTokenStream.NumericTermAttribute

getRawValue

public long getRawValue()

Description copied from interface: NumericTokenStream.NumericTermAttribute

Returns current token's raw value as long with all NumericTokenStream.NumericTermAttribute.getShift() applied, undefined before first token

Specified by:

getRawValue in interface NumericTokenStream.NumericTermAttribute

getValueSize

public int getValueSize()

Description copied from interface: NumericTokenStream.NumericTermAttribute

Returns value size in bits (32 for float, int; 64 for double, long)

Specified by:

getValueSize in interface NumericTokenStream.NumericTermAttribute

init

public void init(long value,
                 int valueSize,
                 int precisionStep,
                 int shift)

Description copied from interface: NumericTokenStream.NumericTermAttribute

Don't call this method!

Specified by:

init in interface NumericTokenStream.NumericTermAttribute

clear

public void clear()

Description copied from class: AttributeImpl

Clears the values in this AttributeImpl and resets it to its default value. If this implementation implements more than one Attribute interface it clears all.

Specified by:

clear in class AttributeImpl

reflectWith

public void reflectWith(AttributeReflector reflector)

Description copied from class: AttributeImpl

This method is for introspection of attributes, it should simply add the key/values this attribute holds to the given AttributeReflector.

The default implementation calls AttributeReflector.reflect(java.lang.Class<? extends org.apache.lucene.util.Attribute>, java.lang.String, java.lang.Object) for all non-static fields from the implementing class, using the field name as key and the field value as value. The Attribute class is also determined by reflection. Please note that the default implementation can only handle single-Attribute implementations.

Custom implementations look like this (e.g. for a combined attribute implementation):

   public void reflectWith(AttributeReflector reflector) {
     reflector.reflect(CharTermAttribute.class, "term", term());
     reflector.reflect(PositionIncrementAttribute.class, "positionIncrement", getPositionIncrement());
   }
 

If you implement this method, make sure that for each invocation, the same set of Attribute interfaces and keys are passed to AttributeReflector.reflect(java.lang.Class<? extends org.apache.lucene.util.Attribute>, java.lang.String, java.lang.Object) in the same order, but possibly different values. So don't automatically exclude e.g. null properties!

Overrides:

reflectWith in class AttributeImpl

See Also:

AttributeImpl.reflectAsString(boolean)

copyTo

public void copyTo(AttributeImpl target)

Description copied from class: AttributeImpl

Copies the values from this Attribute into the passed-in target attribute. The target implementation must support all the Attributes this implementation supports.

Specified by:

copyTo in class AttributeImpl