| /* |
| * 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. |
| */ |
| |
| /** |
| * Query nodes commonly used by query parser implementations. |
| * |
| * <h2>Query Nodes</h2> |
| * <p> |
| * The package <tt>org.apache.lucene.queryParser.nodes</tt> contains all the basic query nodes. The interface |
| * that represents a query node is {@link org.apache.lucene.queryparser.flexible.core.nodes.QueryNode}. |
| * <p> |
| * {@link org.apache.lucene.queryparser.flexible.core.nodes.QueryNode}s are used by the text parser to create a syntax tree. |
| * These nodes are designed to be used by UI or other text parsers. |
| * The default Lucene text parser is {@link org.apache.lucene.queryparser.flexible.standard.parser.StandardSyntaxParser}, |
| * it implements Lucene's standard syntax. |
| * <p> |
| * {@link org.apache.lucene.queryparser.flexible.core.nodes.QueryNode} interface should be implemented by all query nodes, |
| * the class {@link org.apache.lucene.queryparser.flexible.core.nodes.QueryNodeImpl} implements {@link org.apache.lucene.queryparser.flexible.core.nodes.QueryNode} and is extended |
| * by all current query node implementations. |
| * <p> |
| * A query node tree can be printed to the a stream, and it generates a pseudo XML representation |
| * with all the nodes. |
| * </p> |
| * <p> |
| * A query node tree can also generate a query string that can be parsed back by the original text parser, |
| * at this point only the standard lucene syntax is supported. |
| * <p> |
| * Grouping nodes: |
| * <ul> |
| * <li>AndQueryNode - used for AND operator</li> |
| * <li>AnyQueryNode - used for ANY operator</li> |
| * <li>OrQueryNode - used for OR operator</li> |
| * <li>BooleanQueryNode - used when no operator is specified</li> |
| * <li>ModifierQueryNode - used for modifier operator</li> |
| * <li>GroupQueryNode - used for parenthesis</li> |
| * <li>BoostQueryNode - used for boost operator</li> |
| * <li>SlopQueryNode - phrase slop</li> |
| * <li>FuzzyQueryNode - fuzzy node</li> |
| * <li>TermRangeQueryNode - used for parametric field:[low_value TO high_value]</li> |
| * <li>ProximityQueryNode - used for proximity search</li> |
| * <li>LegacyNumericRangeQueryNode - used for numeric range search</li> |
| * <li>TokenizedPhraseQueryNode - used by tokenizers/lemmatizers/analyzers for phrases/autophrases</li> |
| * </ul> |
| * <p> |
| * Leaf Nodes: |
| * <ul> |
| * <li>FieldQueryNode - field/value node</li> |
| * <li>LegacyNumericQueryNode - used for numeric search</li> |
| * <li>PathQueryNode - {@link org.apache.lucene.queryparser.flexible.core.nodes.QueryNode} object used with path-like queries</li> |
| * <li>OpaqueQueryNode - Used as for part of the query that can be parsed by other parsers. schema/value</li> |
| * <li>PrefixWildcardQueryNode - non-phrase wildcard query</li> |
| * <li>QuotedFieldQUeryNode - regular phrase node</li> |
| * <li>WildcardQueryNode - non-phrase wildcard query</li> |
| * </ul> |
| * <p> |
| * Utility Nodes: |
| * <ul> |
| * <li>DeletedQueryNode - used by processors on optimizations</li> |
| * <li>MatchAllDocsQueryNode - used by processors on optimizations</li> |
| * <li>MatchNoDocsQueryNode - used by processors on optimizations</li> |
| * <li>NoTokenFoundQueryNode - used by tokenizers/lemmatizers/analyzers</li> |
| * </ul> |
| */ |
| package org.apache.lucene.queryparser.flexible.core.nodes; |
