pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / queryparser / src / java / org / apache / lucene / queryParser / standard / processors / FuzzyQueryNodeProcessor.java

diff --git a/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/FuzzyQueryNodeProcessor.java b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/FuzzyQueryNodeProcessor.java
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+++ b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/FuzzyQueryNodeProcessor.java
@@ -0,0 +1,86 @@
+package org.apache.lucene.queryParser.standard.processors;
+
+/**
+ * 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.
+ */
+
+import java.util.List;
+
+import org.apache.lucene.queryParser.core.QueryNodeException;
+import org.apache.lucene.queryParser.core.config.QueryConfigHandler;
+import org.apache.lucene.queryParser.core.nodes.FuzzyQueryNode;
+import org.apache.lucene.queryParser.core.nodes.QueryNode;
+import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
+import org.apache.lucene.queryParser.standard.config.FuzzyConfig;
+import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler.ConfigurationKeys;
+import org.apache.lucene.search.FuzzyQuery;
+
+/**
+ * This processor iterates the query node tree looking for every
+ * {@link FuzzyQueryNode}, when this kind of node is found, it checks on the
+ * query configuration for
+ * {@link ConfigurationKeys#FUZZY_CONFIG}, gets the
+ * fuzzy prefix length and default similarity from it and set to the fuzzy node.
+ * For more information about fuzzy prefix length check: {@link FuzzyQuery}. <br/>
+ * 
+ * @see ConfigurationKeys#FUZZY_CONFIG
+ * @see FuzzyQuery
+ * @see FuzzyQueryNode
+ */
+public class FuzzyQueryNodeProcessor extends QueryNodeProcessorImpl {
+
+  @Override
+  protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
+
+    return node;
+
+  }
+
+  @Override
+  protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
+
+    if (node instanceof FuzzyQueryNode) {
+      FuzzyQueryNode fuzzyNode = (FuzzyQueryNode) node;
+      QueryConfigHandler config = getQueryConfigHandler();
+
+      FuzzyConfig fuzzyConfig = null;
+      
+      if (config != null && (fuzzyConfig = config.get(ConfigurationKeys.FUZZY_CONFIG)) != null) {
+        fuzzyNode.setPrefixLength(fuzzyConfig.getPrefixLength());
+
+        if (fuzzyNode.getSimilarity() < 0) {
+          fuzzyNode.setSimilarity(fuzzyConfig.getMinSimilarity());
+        }
+        
+      } else if (fuzzyNode.getSimilarity() < 0) {
+        throw new IllegalArgumentException("No FUZZY_CONFIG set in the config");
+      }
+
+    }
+
+    return node;
+
+  }
+
+  @Override
+  protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
+      throws QueryNodeException {
+
+    return children;
+
+  }
+
+}