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package org.apache.lucene.queryParser.standard.processors;
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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.queryParser.core.QueryNodeException;
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import org.apache.lucene.queryParser.core.config.QueryConfigHandler;
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import org.apache.lucene.queryParser.core.nodes.QueryNode;
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import org.apache.lucene.queryParser.core.nodes.SlopQueryNode;
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import org.apache.lucene.queryParser.core.nodes.TokenizedPhraseQueryNode;
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import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
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import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler.ConfigurationKeys;
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import org.apache.lucene.queryParser.standard.nodes.MultiPhraseQueryNode;
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* This processor verifies if {@link ConfigurationKeys#PHRASE_SLOP}
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* is defined in the {@link QueryConfigHandler}. If it is, it looks for every
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* {@link TokenizedPhraseQueryNode} and {@link MultiPhraseQueryNode} that does
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* not have any {@link SlopQueryNode} applied to it and creates an
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* {@link SlopQueryNode} and apply to it. The new {@link SlopQueryNode} has the
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* same slop value defined in the configuration. <br/>
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* @see ConfigurationKeys#PHRASE_SLOP
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public class DefaultPhraseSlopQueryNodeProcessor extends QueryNodeProcessorImpl {
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private boolean processChildren = true;
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private int defaultPhraseSlop;
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public DefaultPhraseSlopQueryNodeProcessor() {
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public QueryNode process(QueryNode queryTree) throws QueryNodeException {
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QueryConfigHandler queryConfig = getQueryConfigHandler();
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if (queryConfig != null) {
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Integer defaultPhraseSlop = queryConfig.get(ConfigurationKeys.PHRASE_SLOP);
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if (defaultPhraseSlop != null) {
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this.defaultPhraseSlop = defaultPhraseSlop;
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return super.process(queryTree);
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protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
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if (node instanceof TokenizedPhraseQueryNode
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|| node instanceof MultiPhraseQueryNode) {
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return new SlopQueryNode(node, this.defaultPhraseSlop);
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protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
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if (node instanceof SlopQueryNode) {
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this.processChildren = false;
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protected void processChildren(QueryNode queryTree) throws QueryNodeException {
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if (this.processChildren) {
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super.processChildren(queryTree);
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this.processChildren = true;
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protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
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throws QueryNodeException {