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Analyzers
Miscellaneous
PrefixAndSuffixAwareTokenFilter.cs
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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namespace
Lucene.Net.Analysis.Miscellaneous
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{
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public
class
PrefixAndSuffixAwareTokenFilter
:
TokenStream
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{
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private
readonly
PrefixAwareTokenFilter
_suffix;
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public
PrefixAndSuffixAwareTokenFilter
(
TokenStream
prefix,
TokenStream
input,
TokenStream
suffix) : base(suffix)
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{
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_suffix =
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new
InjectablePrefixAwareTokenFilter
(
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new
InjectablePrefixAwareTokenFilter
(prefix, input)
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{
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UpdateAction = UpdateInputToken
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},
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suffix)
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{
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UpdateAction = UpdateSuffixToken
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};
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}
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public
Token
UpdateInputToken(
Token
inputToken,
Token
lastPrefixToken)
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{
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inputToken.
StartOffset
= lastPrefixToken.
EndOffset
+ inputToken.
StartOffset
;
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inputToken.
EndOffset
= lastPrefixToken.
EndOffset
+ inputToken.
EndOffset
;
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return
inputToken;
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}
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public
Token
UpdateSuffixToken(
Token
suffixToken,
Token
lastInputToken)
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{
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suffixToken.
StartOffset
= lastInputToken.
EndOffset
+ suffixToken.
StartOffset
;
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suffixToken.
EndOffset
= lastInputToken.
EndOffset
+ suffixToken.
EndOffset
;
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return
suffixToken;
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}
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public
override
sealed
bool
IncrementToken()
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{
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return
_suffix.IncrementToken();
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}
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public
override
void
Reset()
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{
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_suffix.Reset();
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}
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protected
override
void
Dispose(
bool
disposing)
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{
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_suffix.Dispose();
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}
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}
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}
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