62 lines
2.0 KiB
Java
62 lines
2.0 KiB
Java
// Copyright (C) 2014 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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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package com.google.gerrit.lucene;
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import java.io.Reader;
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import java.util.Map;
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import org.apache.lucene.analysis.Analyzer;
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import org.apache.lucene.analysis.AnalyzerWrapper;
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import org.apache.lucene.analysis.charfilter.MappingCharFilter;
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import org.apache.lucene.analysis.charfilter.NormalizeCharMap;
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/**
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* This analyzer can be used to provide custom char mappings.
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*
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* <p>Example usage:
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*
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* <pre class="prettyprint">{@code
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* Map<String,String> customMapping = new HashMap<>();
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* customMapping.put("_", " ");
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* customMapping.put(".", " ");
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*
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* CustomMappingAnalyzer analyzer =
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* new CustomMappingAnalyzer(new StandardAnalyzer(version), customMapping);
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* }</pre>
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*/
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public class CustomMappingAnalyzer extends AnalyzerWrapper {
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private Analyzer delegate;
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private Map<String, String> customMappings;
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public CustomMappingAnalyzer(Analyzer delegate, Map<String, String> customMappings) {
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super(delegate.getReuseStrategy());
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this.delegate = delegate;
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this.customMappings = customMappings;
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}
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@Override
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protected Analyzer getWrappedAnalyzer(String fieldName) {
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return delegate;
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}
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@Override
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protected Reader wrapReader(String fieldName, Reader reader) {
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NormalizeCharMap.Builder builder = new NormalizeCharMap.Builder();
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for (Map.Entry<String, String> e : customMappings.entrySet()) {
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builder.add(e.getKey(), e.getValue());
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}
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return new MappingCharFilter(builder.build(), reader);
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}
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}
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