pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / queryparser / src / test / org / apache / lucene / queryParser / spans / UniqueFieldQueryNodeProcessor.java

diff --git a/lucene-java-3.5.0/lucene/contrib/queryparser/src/test/org/apache/lucene/queryParser/spans/UniqueFieldQueryNodeProcessor.java b/lucene-java-3.5.0/lucene/contrib/queryparser/src/test/org/apache/lucene/queryParser/spans/UniqueFieldQueryNodeProcessor.java
new file mode 100644 (file)
index 0000000..95997be
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+++ b/lucene-java-3.5.0/lucene/contrib/queryparser/src/test/org/apache/lucene/queryParser/spans/UniqueFieldQueryNodeProcessor.java
@@ -0,0 +1,82 @@
+package org.apache.lucene.queryParser.spans;
+
+/**
+ * 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.FieldableNode;
+import org.apache.lucene.queryParser.core.nodes.QueryNode;
+import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
+
+/**
+ * This processor changes every field name of each {@link FieldableNode} query
+ * node contained in the query tree to the field name defined in the
+ * {@link UniqueFieldAttribute}. So, the {@link UniqueFieldAttribute} must be
+ * defined in the {@link QueryConfigHandler} object set in this processor,
+ * otherwise it throws an exception.<br/>
+ * <br/>
+ * 
+ * @see UniqueFieldAttribute
+ */
+public class UniqueFieldQueryNodeProcessor extends QueryNodeProcessorImpl {
+
+  @Override
+  protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
+
+    return node;
+
+  }
+
+  @Override
+  protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
+
+    if (node instanceof FieldableNode) {
+      FieldableNode fieldNode = (FieldableNode) node;
+
+      QueryConfigHandler queryConfig = getQueryConfigHandler();
+
+      if (queryConfig == null) {
+        throw new IllegalArgumentException(
+            "A config handler is expected by the processor UniqueFieldQueryNodeProcessor!");
+      }
+
+      if (!queryConfig.has(SpansQueryConfigHandler.UNIQUE_FIELD)) {
+        throw new IllegalArgumentException(
+            "UniqueFieldAttribute should be defined in the config handler!");
+      }
+
+      String uniqueField = queryConfig.get(SpansQueryConfigHandler.UNIQUE_FIELD);
+      fieldNode.setField(uniqueField);
+
+    }
+
+    return node;
+
+  }
+
+  @Override
+  protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
+      throws QueryNodeException {
+
+    return children;
+
+  }
+
+}