| /* |
| * 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. |
| */ |
| package org.apache.lucene.queryparser.flexible.standard.processors; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.lucene.queryparser.flexible.core.QueryNodeException; |
| import org.apache.lucene.queryparser.flexible.core.config.QueryConfigHandler; |
| import org.apache.lucene.queryparser.flexible.core.nodes.AndQueryNode; |
| import org.apache.lucene.queryparser.flexible.core.nodes.BooleanQueryNode; |
| import org.apache.lucene.queryparser.flexible.core.nodes.ModifierQueryNode; |
| import org.apache.lucene.queryparser.flexible.core.nodes.ModifierQueryNode.Modifier; |
| import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode; |
| import org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessor; |
| import org.apache.lucene.queryparser.flexible.precedence.processors.BooleanModifiersQueryNodeProcessor; |
| import org.apache.lucene.queryparser.flexible.standard.config.StandardQueryConfigHandler; |
| import org.apache.lucene.queryparser.flexible.standard.config.StandardQueryConfigHandler.ConfigurationKeys; |
| import org.apache.lucene.queryparser.flexible.standard.config.StandardQueryConfigHandler.Operator; |
| import org.apache.lucene.queryparser.flexible.standard.nodes.BooleanModifierNode; |
| import org.apache.lucene.queryparser.flexible.standard.parser.StandardSyntaxParser; |
| |
| /** |
| * <p> |
| * This processor is used to apply the correct {@link ModifierQueryNode} to |
| * {@link BooleanQueryNode}s children. This is a variant of |
| * {@link BooleanModifiersQueryNodeProcessor} which ignores precedence. |
| * </p> |
| * <p> |
| * The {@link StandardSyntaxParser} knows the rules of precedence, but lucene |
| * does not. e.g. <code>(A AND B OR C AND D)</code> ist treated like |
| * <code>(+A +B +C +D)</code>. |
| * </p> |
| * <p> |
| * This processor walks through the query node tree looking for |
| * {@link BooleanQueryNode}s. If an {@link AndQueryNode} is found, every child, |
| * which is not a {@link ModifierQueryNode} or the {@link ModifierQueryNode} is |
| * {@link Modifier#MOD_NONE}, becomes a {@link Modifier#MOD_REQ}. For default |
| * {@link BooleanQueryNode}, it checks the default operator is |
| * {@link Operator#AND}, if it is, the same operation when an |
| * {@link AndQueryNode} is found is applied to it. Each {@link BooleanQueryNode} |
| * which direct parent is also a {@link BooleanQueryNode} is removed (to ignore |
| * the rules of precedence). |
| * </p> |
| * |
| * @see ConfigurationKeys#DEFAULT_OPERATOR |
| * @see BooleanModifiersQueryNodeProcessor |
| */ |
| public class BooleanQuery2ModifierNodeProcessor implements QueryNodeProcessor { |
| final static String TAG_REMOVE = "remove"; |
| final static String TAG_MODIFIER = "wrapWithModifier"; |
| final static String TAG_BOOLEAN_ROOT = "booleanRoot"; |
| |
| QueryConfigHandler queryConfigHandler; |
| |
| private final ArrayList<QueryNode> childrenBuffer = new ArrayList<>(); |
| |
| private Boolean usingAnd = false; |
| |
| public BooleanQuery2ModifierNodeProcessor() { |
| // empty constructor |
| } |
| |
| @Override |
| public QueryNode process(QueryNode queryTree) throws QueryNodeException { |
| Operator op = getQueryConfigHandler().get( |
| ConfigurationKeys.DEFAULT_OPERATOR); |
| |
| if (op == null) { |
| throw new IllegalArgumentException( |
| "StandardQueryConfigHandler.ConfigurationKeys.DEFAULT_OPERATOR should be set on the QueryConfigHandler"); |
| } |
| |
| this.usingAnd = StandardQueryConfigHandler.Operator.AND == op; |
| |
| return processIteration(queryTree); |
| |
| } |
| |
| protected void processChildren(QueryNode queryTree) throws QueryNodeException { |
| List<QueryNode> children = queryTree.getChildren(); |
| if (children != null && children.size() > 0) { |
| for (QueryNode child : children) { |
| child = processIteration(child); |
| } |
| } |
| } |
| |
| private QueryNode processIteration(QueryNode queryTree) |
| throws QueryNodeException { |
| queryTree = preProcessNode(queryTree); |
| |
| processChildren(queryTree); |
| |
| queryTree = postProcessNode(queryTree); |
| |
| return queryTree; |
| |
| } |
| |
| protected void fillChildrenBufferAndApplyModifiery(QueryNode parent) { |
| for (QueryNode node : parent.getChildren()) { |
| if (node.containsTag(TAG_REMOVE)) { |
| fillChildrenBufferAndApplyModifiery(node); |
| } else if (node.containsTag(TAG_MODIFIER)) { |
| childrenBuffer.add(applyModifier(node, |
| (Modifier) node.getTag(TAG_MODIFIER))); |
| } else { |
| childrenBuffer.add(node); |
| } |
| } |
| } |
| |
| protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException { |
| if (node.containsTag(TAG_BOOLEAN_ROOT)) { |
| this.childrenBuffer.clear(); |
| fillChildrenBufferAndApplyModifiery(node); |
| node.set(childrenBuffer); |
| } |
| return node; |
| |
| } |
| |
| protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException { |
| QueryNode parent = node.getParent(); |
| if (node instanceof BooleanQueryNode) { |
| if (parent instanceof BooleanQueryNode) { |
| node.setTag(TAG_REMOVE, Boolean.TRUE); // no precedence |
| } else { |
| node.setTag(TAG_BOOLEAN_ROOT, Boolean.TRUE); |
| } |
| } else if (parent instanceof BooleanQueryNode) { |
| if ((parent instanceof AndQueryNode) |
| || (usingAnd && isDefaultBooleanQueryNode(parent))) { |
| tagModifierButDoNotOverride(node, ModifierQueryNode.Modifier.MOD_REQ); |
| } |
| } |
| return node; |
| } |
| |
| protected boolean isDefaultBooleanQueryNode(QueryNode toTest) { |
| return toTest != null && BooleanQueryNode.class.equals(toTest.getClass()); |
| } |
| |
| private QueryNode applyModifier(QueryNode node, Modifier mod) { |
| |
| // check if modifier is not already defined and is default |
| if (!(node instanceof ModifierQueryNode)) { |
| return new BooleanModifierNode(node, mod); |
| |
| } else { |
| ModifierQueryNode modNode = (ModifierQueryNode) node; |
| |
| if (modNode.getModifier() == Modifier.MOD_NONE) { |
| return new ModifierQueryNode(modNode.getChild(), mod); |
| } |
| |
| } |
| |
| return node; |
| |
| } |
| |
| protected void tagModifierButDoNotOverride(QueryNode node, Modifier mod) { |
| if (node instanceof ModifierQueryNode) { |
| ModifierQueryNode modNode = (ModifierQueryNode) node; |
| if (modNode.getModifier() == Modifier.MOD_NONE) { |
| node.setTag(TAG_MODIFIER, mod); |
| } |
| } else { |
| node.setTag(TAG_MODIFIER, ModifierQueryNode.Modifier.MOD_REQ); |
| } |
| } |
| |
| @Override |
| public void setQueryConfigHandler(QueryConfigHandler queryConfigHandler) { |
| this.queryConfigHandler = queryConfigHandler; |
| |
| } |
| |
| @Override |
| public QueryConfigHandler getQueryConfigHandler() { |
| return queryConfigHandler; |
| } |
| |
| } |
| |