pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / xml-query-parser / src / java / org / apache / lucene / xmlparser / builders / UserInputQueryBuilder.java

diff --git a/lucene-java-3.5.0/lucene/contrib/xml-query-parser/src/java/org/apache/lucene/xmlparser/builders/UserInputQueryBuilder.java b/lucene-java-3.5.0/lucene/contrib/xml-query-parser/src/java/org/apache/lucene/xmlparser/builders/UserInputQueryBuilder.java
new file mode 100644 (file)
index 0000000..5d691b1
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+++ b/lucene-java-3.5.0/lucene/contrib/xml-query-parser/src/java/org/apache/lucene/xmlparser/builders/UserInputQueryBuilder.java
@@ -0,0 +1,96 @@
+package org.apache.lucene.xmlparser.builders;
+
+import org.apache.lucene.analysis.Analyzer;
+import org.apache.lucene.queryParser.ParseException;
+import org.apache.lucene.queryParser.QueryParser;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.xmlparser.DOMUtils;
+import org.apache.lucene.xmlparser.ParserException;
+import org.apache.lucene.xmlparser.QueryBuilder;
+import org.w3c.dom.Element;
+import org.apache.lucene.util.Version;
+
+/**
+ * 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.
+ */
+
+/**
+ * UserInputQueryBuilder uses 1 of 2 strategies for thread-safe parsing:
+ * 1) Synchronizing access to "parse" calls on a previously supplied QueryParser
+ * or..
+ * 2) creating a new QueryParser object for each parse request
+ */
+public class UserInputQueryBuilder implements QueryBuilder {
+
+       QueryParser unSafeParser;
+       private Analyzer analyzer;
+       private String defaultField;
+       
+       /**
+        * This constructor has the disadvantage of not being able to change choice of default field name
+        * @param parser thread un-safe query parser
+        */
+       public UserInputQueryBuilder(QueryParser parser) {
+               this.unSafeParser = parser;
+       }
+
+       public UserInputQueryBuilder(String defaultField, Analyzer analyzer) {
+               this.analyzer = analyzer;
+               this.defaultField = defaultField;
+       }
+       
+       /* (non-Javadoc)
+        * @see org.apache.lucene.xmlparser.QueryObjectBuilder#process(org.w3c.dom.Element)
+        */
+       public Query getQuery(Element e) throws ParserException {
+               String text=DOMUtils.getText(e);
+               try {
+                       Query q = null;
+                       if(unSafeParser!=null)
+                       {
+                               //synchronize on unsafe parser
+                               synchronized (unSafeParser)
+                               {
+                                       q = unSafeParser.parse(text);
+                               }
+                       }
+                       else
+                       {
+                               String fieldName=DOMUtils.getAttribute(e, "fieldName", defaultField);
+                               //Create new parser
+                               QueryParser parser=createQueryParser(fieldName, analyzer);
+                               q = parser.parse(text);                         
+                       }
+                       // use the boost of the original query here, too and multiply (which may be != 1.0f):
+                       q.setBoost(q.getBoost()*DOMUtils.getAttribute(e,"boost",1.0f));
+                       return q;
+               } catch (ParseException e1) {
+                       throw new ParserException(e1.getMessage());
+               }
+       }
+       
+       /**
+        * Method to create a QueryParser - designed to be overridden
+        * @param fieldName
+        * @param analyzer
+        * @return QueryParser
+        */
+       protected QueryParser createQueryParser(String fieldName, Analyzer analyzer)
+       {
+               return new QueryParser(Version.LUCENE_CURRENT, fieldName,analyzer);
+       }
+
+}