1 package org.apache.lucene.queryParser.standard.processors;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
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20 import java.util.List;
22 import org.apache.lucene.queryParser.core.QueryNodeException;
23 import org.apache.lucene.queryParser.core.config.FieldConfig;
24 import org.apache.lucene.queryParser.core.config.QueryConfigHandler;
25 import org.apache.lucene.queryParser.core.nodes.BoostQueryNode;
26 import org.apache.lucene.queryParser.core.nodes.FieldableNode;
27 import org.apache.lucene.queryParser.core.nodes.QueryNode;
28 import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
29 import org.apache.lucene.queryParser.core.util.StringUtils;
30 import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler.ConfigurationKeys;
33 * This processor iterates the query node tree looking for every
34 * {@link FieldableNode} that has {@link ConfigurationKeys#BOOST} in its
35 * config. If there is, the boost is applied to that {@link FieldableNode}. <br/>
37 * @see ConfigurationKeys#BOOST
38 * @see QueryConfigHandler
41 public class BoostQueryNodeProcessor extends QueryNodeProcessorImpl {
44 protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
46 if (node instanceof FieldableNode &&
47 (node.getParent() == null || !(node.getParent() instanceof FieldableNode))) {
49 FieldableNode fieldNode = (FieldableNode) node;
50 QueryConfigHandler config = getQueryConfigHandler();
53 CharSequence field = fieldNode.getField();
54 FieldConfig fieldConfig = config.getFieldConfig(StringUtils.toString(field));
56 if (fieldConfig != null) {
57 Float boost = fieldConfig.get(ConfigurationKeys.BOOST);
60 return new BoostQueryNode(node, boost);
74 protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
81 protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
82 throws QueryNodeException {