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java.lang.Object org.apache.lucene.util.AttributeSource org.apache.lucene.analysis.TokenStream org.apache.lucene.analysis.TokenFilter org.apache.lucene.analysis.reverse.ReverseStringFilter
public final class ReverseStringFilter
Reverse token string, for example "country" => "yrtnuoc".
If marker
is supplied, then tokens will be also prepended by
that character. For example, with a marker of \u0001, "country" =>
"\u0001yrtnuoc". This is useful when implementing efficient leading
wildcards search.
Nested Class Summary |
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Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource |
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org.apache.lucene.util.AttributeSource.AttributeFactory, org.apache.lucene.util.AttributeSource.State |
Field Summary | |
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static char |
INFORMATION_SEPARATOR_MARKER
Example marker character: U+001F (INFORMATION SEPARATOR ONE) |
static char |
PUA_EC00_MARKER
Example marker character: U+EC00 (PRIVATE USE AREA: EC00) |
static char |
RTL_DIRECTION_MARKER
Example marker character: U+200F (RIGHT-TO-LEFT MARK) |
static char |
START_OF_HEADING_MARKER
Example marker character: U+0001 (START OF HEADING) |
Fields inherited from class org.apache.lucene.analysis.TokenFilter |
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input |
Constructor Summary | |
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ReverseStringFilter(org.apache.lucene.analysis.TokenStream in)
Create a new ReverseStringFilter that reverses all tokens in the supplied TokenStream . |
|
ReverseStringFilter(org.apache.lucene.analysis.TokenStream in,
char marker)
Create a new ReverseStringFilter that reverses and marks all tokens in the supplied TokenStream . |
Method Summary | |
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boolean |
incrementToken()
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static void |
reverse(char[] buffer)
|
static void |
reverse(char[] buffer,
int len)
|
static void |
reverse(char[] buffer,
int start,
int len)
|
static String |
reverse(String input)
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Methods inherited from class org.apache.lucene.analysis.TokenFilter |
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close, end, reset |
Methods inherited from class org.apache.lucene.analysis.TokenStream |
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getOnlyUseNewAPI, next, next, setOnlyUseNewAPI |
Methods inherited from class org.apache.lucene.util.AttributeSource |
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addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, restoreState, toString |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Field Detail |
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public static final char START_OF_HEADING_MARKER
public static final char INFORMATION_SEPARATOR_MARKER
public static final char PUA_EC00_MARKER
public static final char RTL_DIRECTION_MARKER
Constructor Detail |
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public ReverseStringFilter(org.apache.lucene.analysis.TokenStream in)
TokenStream
.
The reversed tokens will not be marked.
in
- TokenStream
to filterpublic ReverseStringFilter(org.apache.lucene.analysis.TokenStream in, char marker)
TokenStream
.
The reversed tokens will be prepended (marked) by the marker
character.
in
- TokenStream
to filtermarker
- A character used to mark reversed tokensMethod Detail |
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public boolean incrementToken() throws IOException
incrementToken
in class org.apache.lucene.analysis.TokenStream
IOException
public static String reverse(String input)
public static void reverse(char[] buffer)
public static void reverse(char[] buffer, int len)
public static void reverse(char[] buffer, int start, int len)
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