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package org.apache.lucene.queryParser.core.nodes;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.util.List;
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import org.apache.lucene.messages.MessageImpl;
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import org.apache.lucene.queryParser.core.QueryNodeError;
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import org.apache.lucene.queryParser.core.QueryNodeException;
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import org.apache.lucene.queryParser.core.messages.QueryParserMessages;
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import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;
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* A {@link BoostQueryNode} boosts the QueryNode tree which is under this node.
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* So, it must only and always have one child.
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* The boost value may vary from 0.0 to 1.0.
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public class BoostQueryNode extends QueryNodeImpl {
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private static final long serialVersionUID = -3929082630855807593L;
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private float value = 0;
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* Constructs a boost node
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* the query to be boosted
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* the boost value, it may vary from 0.0 to 1.0
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* @throws QueryNodeException
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public BoostQueryNode(QueryNode query, float value) throws QueryNodeException {
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throw new QueryNodeError(new MessageImpl(
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QueryParserMessages.NODE_ACTION_NOT_SUPPORTED, "query", "null"));
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* Returns the single child which this node boosts.
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* @return the single child which this node boosts
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public QueryNode getChild() {
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List<QueryNode> children = getChildren();
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if (children == null || children.size() == 0) {
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return children.get(0);
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* Returns the boost value. It may vary from 0.0 to 1.0.
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* @return the boost value
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public float getValue() {
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* Returns the boost value parsed to a string.
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* @return the parsed value
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private CharSequence getValueString() {
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Float f = Float.valueOf(this.value);
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if (f == f.longValue())
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return "" + f.longValue();
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public String toString() {
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return "<boost value='" + getValueString() + "'>" + "\n"
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+ getChild().toString() + "\n</boost>";
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public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
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if (getChild() == null)
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return getChild().toQueryString(escapeSyntaxParser) + "^"
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public QueryNode cloneTree() throws CloneNotSupportedException {
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BoostQueryNode clone = (BoostQueryNode) super.cloneTree();
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clone.value = this.value;