+++ /dev/null
-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.util.ArrayList;
-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.AndQueryNode;
-import org.apache.lucene.queryParser.core.nodes.BooleanQueryNode;
-import org.apache.lucene.queryParser.core.nodes.GroupQueryNode;
-import org.apache.lucene.queryParser.core.nodes.ModifierQueryNode;
-import org.apache.lucene.queryParser.core.nodes.OrQueryNode;
-import org.apache.lucene.queryParser.core.nodes.QueryNode;
-import org.apache.lucene.queryParser.core.nodes.ModifierQueryNode.Modifier;
-import org.apache.lucene.queryParser.core.parser.SyntaxParser;
-import org.apache.lucene.queryParser.core.processors.QueryNodeProcessor;
-import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler;
-import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler.ConfigurationKeys;
-import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler.Operator;
-import org.apache.lucene.queryParser.standard.nodes.BooleanModifierNode;
-
-/**
- * The {@link SyntaxParser}
- * generates query node trees that consider the boolean operator precedence, but
- * Lucene current syntax does not support boolean precedence, so this processor
- * remove all the precedence and apply the equivalent modifier according to the
- * boolean operation defined on an specific query node. <br/>
- * <br/>
- * If there is a {@link GroupQueryNode} in the query node tree, the query node
- * tree is not merged with the one above it.
- *
- * Example: TODO: describe a good example to show how this processor works
- *
- * @see org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler
- */
-public class GroupQueryNodeProcessor implements QueryNodeProcessor {
-
- private ArrayList<QueryNode> queryNodeList;
-
- private boolean latestNodeVerified;
-
- private QueryConfigHandler queryConfig;
-
- private Boolean usingAnd = false;
-
- public GroupQueryNodeProcessor() {
- // empty constructor
- }
-
- public QueryNode process(QueryNode queryTree) throws QueryNodeException {
- Operator defaultOperator = getQueryConfigHandler().get(ConfigurationKeys.DEFAULT_OPERATOR);
-
- if (defaultOperator == null) {
- throw new IllegalArgumentException(
- "DEFAULT_OPERATOR should be set on the QueryConfigHandler");
- }
-
- this.usingAnd = StandardQueryConfigHandler.Operator.AND == defaultOperator;
-
- if (queryTree instanceof GroupQueryNode) {
- queryTree = ((GroupQueryNode) queryTree).getChild();
- }
-
- this.queryNodeList = new ArrayList<QueryNode>();
- this.latestNodeVerified = false;
- readTree(queryTree);
-
- List<QueryNode> actualQueryNodeList = this.queryNodeList;
-
- for (int i = 0; i < actualQueryNodeList.size(); i++) {
- QueryNode node = actualQueryNodeList.get(i);
-
- if (node instanceof GroupQueryNode) {
- actualQueryNodeList.set(i, process(node));
- }
-
- }
-
- this.usingAnd = false;
-
- if (queryTree instanceof BooleanQueryNode) {
- queryTree.set(actualQueryNodeList);
-
- return queryTree;
-
- } else {
- return new BooleanQueryNode(actualQueryNodeList);
- }
-
- }
-
- /**
- */
- private QueryNode applyModifier(QueryNode node, QueryNode parent) {
-
- if (this.usingAnd) {
-
- if (parent instanceof OrQueryNode) {
-
- if (node instanceof ModifierQueryNode) {
-
- ModifierQueryNode modNode = (ModifierQueryNode) node;
-
- if (modNode.getModifier() == Modifier.MOD_REQ) {
- return modNode.getChild();
- }
-
- }
-
- } else {
-
- if (node instanceof ModifierQueryNode) {
-
- ModifierQueryNode modNode = (ModifierQueryNode) node;
-
- if (modNode.getModifier() == Modifier.MOD_NONE) {
- return new BooleanModifierNode(modNode.getChild(), Modifier.MOD_REQ);
- }
-
- } else {
- return new BooleanModifierNode(node, Modifier.MOD_REQ);
- }
-
- }
-
- } else {
-
- if (node.getParent() instanceof AndQueryNode) {
-
- if (node instanceof ModifierQueryNode) {
-
- ModifierQueryNode modNode = (ModifierQueryNode) node;
-
- if (modNode.getModifier() == Modifier.MOD_NONE) {
- return new BooleanModifierNode(modNode.getChild(), Modifier.MOD_REQ);
- }
-
- } else {
- return new BooleanModifierNode(node, Modifier.MOD_REQ);
- }
-
- }
-
- }
-
- return node;
-
- }
-
- private void readTree(QueryNode node) {
-
- if (node instanceof BooleanQueryNode) {
- List<QueryNode> children = node.getChildren();
-
- if (children != null && children.size() > 0) {
-
- for (int i = 0; i < children.size() - 1; i++) {
- readTree(children.get(i));
- }
-
- processNode(node);
- readTree(children.get(children.size() - 1));
-
- } else {
- processNode(node);
- }
-
- } else {
- processNode(node);
- }
-
- }
-
- private void processNode(QueryNode node) {
-
- if (node instanceof AndQueryNode || node instanceof OrQueryNode) {
-
- if (!this.latestNodeVerified && !this.queryNodeList.isEmpty()) {
- this.queryNodeList.add(applyModifier(this.queryNodeList
- .remove(this.queryNodeList.size() - 1), node));
- this.latestNodeVerified = true;
-
- }
-
- } else if (!(node instanceof BooleanQueryNode)) {
- this.queryNodeList.add(applyModifier(node, node.getParent()));
- this.latestNodeVerified = false;
-
- }
-
- }
-
- public QueryConfigHandler getQueryConfigHandler() {
- return this.queryConfig;
- }
-
- public void setQueryConfigHandler(QueryConfigHandler queryConfigHandler) {
- this.queryConfig = queryConfigHandler;
- }
-
-}
fnp / pylucene.git / blobdiff