pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/LowercaseExpandedTermsQueryNodeProcessor.java b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/LowercaseExpandedTermsQueryNodeProcessor.java
new file mode 100644 (file)
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--- /dev/null
+++ b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/LowercaseExpandedTermsQueryNodeProcessor.java
@@ -0,0 +1,91 @@
+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.FieldQueryNode;
+import org.apache.lucene.queryParser.core.nodes.FuzzyQueryNode;
+import org.apache.lucene.queryParser.core.nodes.ParametricQueryNode;
+import org.apache.lucene.queryParser.core.nodes.QueryNode;
+import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
+import org.apache.lucene.queryParser.core.util.UnescapedCharSequence;
+import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler.ConfigurationKeys;
+import org.apache.lucene.queryParser.standard.nodes.WildcardQueryNode;
+
+/**
+ * This processor verifies if 
+ * {@link ConfigurationKeys#LOWERCASE_EXPANDED_TERMS} is defined in the
+ * {@link QueryConfigHandler}. If it is and the expanded terms should be
+ * lower-cased, it looks for every {@link WildcardQueryNode},
+ * {@link FuzzyQueryNode} and {@link ParametricQueryNode} and lower-case its
+ * term. <br/>
+ * 
+ * @see ConfigurationKeys#LOWERCASE_EXPANDED_TERMS
+ */
+public class LowercaseExpandedTermsQueryNodeProcessor extends
+    QueryNodeProcessorImpl {
+
+  public LowercaseExpandedTermsQueryNodeProcessor() {
+    // empty constructor
+  }
+
+  @Override
+  public QueryNode process(QueryNode queryTree) throws QueryNodeException {
+    Boolean lowercaseExpandedTerms = getQueryConfigHandler().get(ConfigurationKeys.LOWERCASE_EXPANDED_TERMS);
+
+    if (lowercaseExpandedTerms != null && lowercaseExpandedTerms) {
+      return super.process(queryTree);
+    }
+
+    return queryTree;
+
+  }
+
+  @Override
+  protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
+
+    if (node instanceof WildcardQueryNode || node instanceof FuzzyQueryNode
+        || node instanceof ParametricQueryNode) {
+
+      FieldQueryNode fieldNode = (FieldQueryNode) node;
+      fieldNode.setText(UnescapedCharSequence.toLowerCase(fieldNode.getText()));
+    }
+
+    return node;
+
+  }
+
+  @Override
+  protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
+
+    return node;
+
+  }
+
+  @Override
+  protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
+      throws QueryNodeException {
+
+    return children;
+
+  }
+
+}