pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/NumericQueryNodeProcessor.java b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/NumericQueryNodeProcessor.java
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+++ b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/NumericQueryNodeProcessor.java
@@ -0,0 +1,145 @@
+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.text.NumberFormat;
+import java.text.ParseException;
+import java.util.List;
+
+import org.apache.lucene.messages.MessageImpl;
+import org.apache.lucene.queryParser.core.QueryNodeException;
+import org.apache.lucene.queryParser.core.QueryNodeParseException;
+import org.apache.lucene.queryParser.core.config.FieldConfig;
+import org.apache.lucene.queryParser.core.config.QueryConfigHandler;
+import org.apache.lucene.queryParser.core.messages.QueryParserMessages;
+import org.apache.lucene.queryParser.core.nodes.FieldQueryNode;
+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.standard.config.NumericConfig;
+import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler.ConfigurationKeys;
+import org.apache.lucene.queryParser.standard.nodes.NumericQueryNode;
+import org.apache.lucene.queryParser.standard.nodes.NumericRangeQueryNode;
+
+/**
+ * This processor is used to convert {@link FieldQueryNode}s to
+ * {@link NumericRangeQueryNode}s. It looks for
+ * {@link ConfigurationKeys#NUMERIC_CONFIG} set in the {@link FieldConfig} of
+ * every {@link FieldQueryNode} found. If
+ * {@link ConfigurationKeys#NUMERIC_CONFIG} is found, it considers that
+ * {@link FieldQueryNode} to be a numeric query and convert it to
+ * {@link NumericRangeQueryNode} with upper and lower inclusive and lower and
+ * upper equals to the value represented by the {@link FieldQueryNode} converted
+ * to {@link Number}. It means that <b>field:1</b> is converted to <b>field:[1 TO
+ * 1]</b>. <br/>
+ * <br/>
+ * Note that {@link ParametricQueryNode}s are ignored, even being a
+ * {@link FieldQueryNode}.
+ * 
+ * @see ConfigurationKeys#NUMERIC_CONFIG
+ * @see FieldQueryNode
+ * @see NumericConfig
+ * @see NumericQueryNode
+ */
+public class NumericQueryNodeProcessor extends QueryNodeProcessorImpl {
+  
+  /**
+   * Constructs a {@link NumericQueryNodeProcessor} object.
+   */
+  public NumericQueryNodeProcessor() {
+  // empty constructor
+  }
+  
+  @Override
+  protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
+    
+    if (node instanceof FieldQueryNode
+        && !(node instanceof ParametricQueryNode)) {
+      
+      QueryConfigHandler config = getQueryConfigHandler();
+      
+      if (config != null) {
+        FieldQueryNode fieldNode = (FieldQueryNode) node;
+        FieldConfig fieldConfig = config.getFieldConfig(fieldNode
+            .getFieldAsString());
+        
+        if (fieldConfig != null) {
+          NumericConfig numericConfig = fieldConfig
+              .get(ConfigurationKeys.NUMERIC_CONFIG);
+          
+          if (numericConfig != null) {
+            
+            NumberFormat numberFormat = numericConfig.getNumberFormat();
+            Number number;
+            
+            try {
+              number = numberFormat.parse(fieldNode.getTextAsString());
+              
+            } catch (ParseException e) {
+              throw new QueryNodeParseException(new MessageImpl(
+                  QueryParserMessages.COULD_NOT_PARSE_NUMBER, fieldNode
+                      .getTextAsString(), numberFormat.getClass()
+                      .getCanonicalName()), e);
+            }
+            
+            switch (numericConfig.getType()) {
+              case LONG:
+                number = number.longValue();
+                break;
+              case INT:
+                number = number.intValue();
+                break;
+              case DOUBLE:
+                number = number.doubleValue();
+                break;
+              case FLOAT:
+                number = number.floatValue();
+            }
+            
+            NumericQueryNode lowerNode = new NumericQueryNode(fieldNode
+                .getField(), number, numberFormat);
+            NumericQueryNode upperNode = new NumericQueryNode(fieldNode
+                .getField(), number, numberFormat);
+            
+            return new NumericRangeQueryNode(lowerNode, upperNode, true, true,
+                numericConfig);
+            
+          }
+          
+        }
+        
+      }
+      
+    }
+    
+    return node;
+    
+  }
+  
+  @Override
+  protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
+    return node;
+  }
+  
+  @Override
+  protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
+      throws QueryNodeException {
+    return children;
+  }
+  
+}