Remove unused class PreBuiltTokenFilters (#27839)

core/src/main/java/org/elasticsearch/indices/analysis/PreBuiltTokenFilters.java

@@ -1,103 +0,0 @@
-/*
- * Licensed to Elasticsearch under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.elasticsearch.indices.analysis;
-
-import org.apache.lucene.analysis.LowerCaseFilter;
-import org.apache.lucene.analysis.TokenStream;
-import org.elasticsearch.Version;
-import org.elasticsearch.index.analysis.MultiTermAwareComponent;
-import org.elasticsearch.index.analysis.TokenFilterFactory;
-import org.elasticsearch.indices.analysis.PreBuiltCacheFactory.CachingStrategy;
-
-import java.util.Locale;
-
-public enum PreBuiltTokenFilters {
-    // TODO remove this entire class when PreBuiltTokenizers no longer needs it.....
-    LOWERCASE(CachingStrategy.LUCENE) {
-        @Override
-        public TokenStream create(TokenStream tokenStream, Version version) {
-            return new LowerCaseFilter(tokenStream);
-        }
-        @Override
-        protected boolean isMultiTermAware() {
-            return true;
-        }
-    };
-
-    protected boolean isMultiTermAware() {
-        return false;
-    }
-
-    public abstract TokenStream create(TokenStream tokenStream, Version version);
-
-    protected final PreBuiltCacheFactory.PreBuiltCache<TokenFilterFactory> cache;
-
-
-    private final CachingStrategy cachingStrategy;
-    PreBuiltTokenFilters(CachingStrategy cachingStrategy) {
-        this.cachingStrategy = cachingStrategy;
-        cache = PreBuiltCacheFactory.getCache(cachingStrategy);
-    }
-
-    public CachingStrategy getCachingStrategy() {
-        return cachingStrategy;
-    }
-
-    private interface MultiTermAwareTokenFilterFactory extends TokenFilterFactory, MultiTermAwareComponent {}
-
-    public synchronized TokenFilterFactory getTokenFilterFactory(final Version version) {
-        TokenFilterFactory factory = cache.get(version);
-        if (factory == null) {
-            final String finalName = name().toLowerCase(Locale.ROOT);
-            if (isMultiTermAware()) {
-                factory = new MultiTermAwareTokenFilterFactory() {
-                    @Override
-                    public String name() {
-                        return finalName;
-                    }
-
-                    @Override
-                    public TokenStream create(TokenStream tokenStream) {
-                        return PreBuiltTokenFilters.this.create(tokenStream, version);
-                    }
-
-                    @Override
-                    public Object getMultiTermComponent() {
-                        return this;
-                    }
-                };
-            } else {
-                factory = new TokenFilterFactory() {
-                    @Override
-                    public String name() {
-                        return finalName;
-                    }
-
-                    @Override
-                    public TokenStream create(TokenStream tokenStream) {
-                        return PreBuiltTokenFilters.this.create(tokenStream, version);
-                    }
-                };
-            }
-            cache.put(version, factory);
-        }
-
-        return factory;
-    }
-}