| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.apache.solr.spelling; |
| import java.util.Collection; |
| |
| import org.apache.lucene.analysis.Analyzer; |
| import org.apache.solr.common.util.NamedList; |
| import org.apache.solr.util.plugin.NamedListInitializedPlugin; |
| |
| /** |
| * <p> |
| * The QueryConverter is an abstract base class defining a method for converting |
| * input "raw" queries into a set of tokens for spell checking. It is used to |
| * "parse" the CommonParams.Q (the input query) and converts it to tokens. |
| * </p> |
| * |
| * <p> |
| * It is only invoked for the CommonParams.Q parameter, and <b>not</b> the |
| * "spellcheck.q" parameter. Systems that use their own query parser or those |
| * that find issue with the basic implementation should implement their |
| * own QueryConverter instead of using the provided implementation |
| * (SpellingQueryConverter) by overriding the appropriate methods on the |
| * SpellingQueryConverter and registering it in the solrconfig.xml |
| * </p> |
| * |
| * <p> |
| * Refer to <a href="http://wiki.apache.org/solr/SpellCheckComponent">SpellCheckComponent</a> |
| * for more details |
| * </p> |
| * |
| * @since solr 1.3 |
| */ |
| public abstract class QueryConverter implements NamedListInitializedPlugin { |
| @SuppressWarnings({"rawtypes"}) |
| private NamedList args; |
| |
| protected Analyzer analyzer; |
| |
| /** |
| * <p>This term is marked prohibited in the query with the minus sign.</p> |
| * |
| */ |
| public static final int PROHIBITED_TERM_FLAG = 16384; |
| /** |
| * <p>This term is marked required in the query with the plus sign.</p> |
| */ |
| public static final int REQUIRED_TERM_FLAG = 32768; |
| /** |
| * <p> |
| * This term is directly followed by a boolean operator (AND/OR/NOT) |
| * and this operator differs from the prior boolean operator |
| * in the query (this signifies this term is likely part of a different |
| * query clause than the next term in the query) |
| * </p> |
| */ |
| public static final int TERM_PRECEDES_NEW_BOOLEAN_OPERATOR_FLAG = 65536; |
| /** |
| * <p> |
| * This term exists in a query that contains boolean operators |
| * (AND/OR/NOT) |
| * </p> |
| */ |
| public static final int TERM_IN_BOOLEAN_QUERY_FLAG = 131072; |
| @Override |
| public void init(@SuppressWarnings({"rawtypes"})NamedList args) { |
| this.args = args; |
| } |
| |
| /** |
| * Returns the Collection of {@link Token}s for |
| * the query. Offsets on the Token should correspond to the correct |
| * offset in the origQuery |
| */ |
| public abstract Collection<Token> convert(String original); |
| |
| /** |
| * Set the analyzer to use. Must be set before any calls to convert. |
| */ |
| public void setAnalyzer(Analyzer analyzer) { |
| this.analyzer = analyzer; |
| } |
| |
| public Analyzer getAnalyzer() { |
| return analyzer; |
| } |
| } |