Class CharTermAttributeImpl
- java.lang.Object
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- org.apache.lucene.util.AttributeImpl
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- org.apache.lucene.analysis.tokenattributes.CharTermAttributeImpl
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- All Implemented Interfaces:
Appendable
,CharSequence
,Cloneable
,CharTermAttribute
,TermToBytesRefAttribute
,Attribute
- Direct Known Subclasses:
PackedTokenAttributeImpl
public class CharTermAttributeImpl extends AttributeImpl implements CharTermAttribute, TermToBytesRefAttribute
Default implementation ofCharTermAttribute
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Field Summary
Fields Modifier and Type Field Description protected BytesRefBuilder
builder
May be used by subclasses to convert to different charsets / encodings for implementinggetBytesRef()
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Constructor Summary
Constructors Constructor Description CharTermAttributeImpl()
Initialize this attribute with empty term text
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description CharTermAttribute
append(char c)
CharTermAttribute
append(CharSequence csq)
CharTermAttribute
append(CharSequence csq, int start, int end)
CharTermAttribute
append(String s)
Appends the specifiedString
to this character sequence.CharTermAttribute
append(StringBuilder s)
Appends the specifiedStringBuilder
to this character sequence.CharTermAttribute
append(CharTermAttribute ta)
Appends the contents of the otherCharTermAttribute
to this character sequence.char[]
buffer()
Returns the internal termBuffer character array which you can then directly alter.char
charAt(int index)
void
clear()
Clears the values in this AttributeImpl and resets it to its default value.CharTermAttributeImpl
clone()
In most cases the clone is, and should be, deep in order to be able to properly capture the state of all attributes.void
copyBuffer(char[] buffer, int offset, int length)
Copies the contents of buffer, starting at offset for length characters, into the termBuffer array.void
copyTo(AttributeImpl target)
Copies the values from this Attribute into the passed-in target attribute.boolean
equals(Object other)
BytesRef
getBytesRef()
Retrieve this attribute's BytesRef.int
hashCode()
int
length()
void
reflectWith(AttributeReflector reflector)
This method is for introspection of attributes, it should simply add the key/values this attribute holds to the givenAttributeReflector
.char[]
resizeBuffer(int newSize)
Grows the termBuffer to at least size newSize, preserving the existing content.CharTermAttribute
setEmpty()
Sets the length of the termBuffer to zero.CharTermAttribute
setLength(int length)
Set number of valid characters (length of the term) in the termBuffer array.CharSequence
subSequence(int start, int end)
String
toString()
Returns solely the term text as specified by theCharSequence
interface.-
Methods inherited from class org.apache.lucene.util.AttributeImpl
end, reflectAsString
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Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface java.lang.CharSequence
chars, codePoints
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Field Detail
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builder
protected BytesRefBuilder builder
May be used by subclasses to convert to different charsets / encodings for implementinggetBytesRef()
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Method Detail
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copyBuffer
public final void copyBuffer(char[] buffer, int offset, int length)
Description copied from interface:CharTermAttribute
Copies the contents of buffer, starting at offset for length characters, into the termBuffer array.- Specified by:
copyBuffer
in interfaceCharTermAttribute
- Parameters:
buffer
- the buffer to copyoffset
- the index in the buffer of the first character to copylength
- the number of characters to copy
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buffer
public final char[] buffer()
Description copied from interface:CharTermAttribute
Returns the internal termBuffer character array which you can then directly alter. If the array is too small for your token, useCharTermAttribute.resizeBuffer(int)
to increase it. After altering the buffer be sure to callCharTermAttribute.setLength(int)
to record the number of valid characters that were placed into the termBuffer.NOTE: The returned buffer may be larger than the valid
CharSequence.length()
.- Specified by:
buffer
in interfaceCharTermAttribute
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resizeBuffer
public final char[] resizeBuffer(int newSize)
Description copied from interface:CharTermAttribute
Grows the termBuffer to at least size newSize, preserving the existing content.- Specified by:
resizeBuffer
in interfaceCharTermAttribute
- Parameters:
newSize
- minimum size of the new termBuffer- Returns:
- newly created termBuffer with
length >= newSize
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setLength
public final CharTermAttribute setLength(int length)
Description copied from interface:CharTermAttribute
Set number of valid characters (length of the term) in the termBuffer array. Use this to truncate the termBuffer or to synchronize with external manipulation of the termBuffer. Note: to grow the size of the array, useCharTermAttribute.resizeBuffer(int)
first.- Specified by:
setLength
in interfaceCharTermAttribute
- Parameters:
length
- the truncated length
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setEmpty
public final CharTermAttribute setEmpty()
Description copied from interface:CharTermAttribute
Sets the length of the termBuffer to zero. Use this method before appending contents using theAppendable
interface.- Specified by:
setEmpty
in interfaceCharTermAttribute
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getBytesRef
public BytesRef getBytesRef()
Description copied from interface:TermToBytesRefAttribute
Retrieve this attribute's BytesRef. The bytes are updated from the current term. The implementation may return a new instance or keep the previous one.- Specified by:
getBytesRef
in interfaceTermToBytesRefAttribute
- Returns:
- a BytesRef to be indexed (only stays valid until token stream gets incremented)
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length
public final int length()
- Specified by:
length
in interfaceCharSequence
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charAt
public final char charAt(int index)
- Specified by:
charAt
in interfaceCharSequence
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subSequence
public final CharSequence subSequence(int start, int end)
- Specified by:
subSequence
in interfaceCharSequence
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append
public final CharTermAttribute append(CharSequence csq)
- Specified by:
append
in interfaceAppendable
- Specified by:
append
in interfaceCharTermAttribute
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append
public final CharTermAttribute append(CharSequence csq, int start, int end)
- Specified by:
append
in interfaceAppendable
- Specified by:
append
in interfaceCharTermAttribute
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append
public final CharTermAttribute append(char c)
- Specified by:
append
in interfaceAppendable
- Specified by:
append
in interfaceCharTermAttribute
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append
public final CharTermAttribute append(String s)
Description copied from interface:CharTermAttribute
Appends the specifiedString
to this character sequence.The characters of the
String
argument are appended, in order, increasing the length of this sequence by the length of the argument. If argument isnull
, then the four characters"null"
are appended.- Specified by:
append
in interfaceCharTermAttribute
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append
public final CharTermAttribute append(StringBuilder s)
Description copied from interface:CharTermAttribute
Appends the specifiedStringBuilder
to this character sequence.The characters of the
StringBuilder
argument are appended, in order, increasing the length of this sequence by the length of the argument. If argument isnull
, then the four characters"null"
are appended.- Specified by:
append
in interfaceCharTermAttribute
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append
public final CharTermAttribute append(CharTermAttribute ta)
Description copied from interface:CharTermAttribute
Appends the contents of the otherCharTermAttribute
to this character sequence.The characters of the
CharTermAttribute
argument are appended, in order, increasing the length of this sequence by the length of the argument. If argument isnull
, then the four characters"null"
are appended.- Specified by:
append
in interfaceCharTermAttribute
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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 classAttributeImpl
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clone
public CharTermAttributeImpl clone()
Description copied from class:AttributeImpl
In most cases the clone is, and should be, deep in order to be able to properly capture the state of all attributes.- Overrides:
clone
in classAttributeImpl
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toString
public String toString()
Returns solely the term text as specified by theCharSequence
interface.- Specified by:
toString
in interfaceCharSequence
- Overrides:
toString
in classObject
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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 givenAttributeReflector
.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 toAttributeReflector.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!- Specified by:
reflectWith
in classAttributeImpl
- See Also:
AttributeImpl.reflectAsString(boolean)
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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 classAttributeImpl
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