| /* |
| * 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.directory.server.xdbm.search.impl; |
| |
| |
| import org.apache.directory.server.schema.registries.Registries; |
| import org.apache.directory.server.xdbm.Store; |
| import org.apache.directory.server.xdbm.search.Evaluator; |
| import org.apache.directory.server.core.entry.ServerEntry; |
| import org.apache.directory.shared.ldap.filter.*; |
| import org.apache.directory.shared.ldap.NotImplementedException; |
| |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| |
| /** |
| * Top level filter expression evaluator builder implemenation. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| * @version $Rev$ |
| */ |
| public class EvaluatorBuilder |
| { |
| private final Store<ServerEntry> db; |
| private final Registries registries; |
| |
| |
| /** |
| * Creates a top level Evaluator where leaves are delegated to a leaf node |
| * evaluator which will be created. |
| * |
| * @param db the database this evaluator operates upon |
| * @param registries the schema registries |
| * @throws Exception failure to access db or lookup schema in registries |
| */ |
| public EvaluatorBuilder( Store<ServerEntry> db, Registries registries ) throws Exception |
| { |
| this.db = db; |
| this.registries = registries; |
| } |
| |
| |
| public Evaluator<? extends ExprNode, ServerEntry> build( ExprNode node ) throws Exception |
| { |
| switch ( node.getAssertionType() ) |
| { |
| /* ---------- LEAF NODE HANDLING ---------- */ |
| |
| case APPROXIMATE: |
| return new ApproximateEvaluator( ( ApproximateNode ) node, db, registries ); |
| case EQUALITY: |
| return new EqualityEvaluator( ( EqualityNode ) node, db, registries ); |
| case GREATEREQ: |
| return new GreaterEqEvaluator( ( GreaterEqNode ) node, db, registries ); |
| case LESSEQ: |
| return new LessEqEvaluator( ( LessEqNode ) node, db, registries ); |
| case PRESENCE: |
| return new PresenceEvaluator( ( PresenceNode ) node, db, registries ); |
| case SCOPE: |
| if ( ( ( ScopeNode ) node ).getScope() == SearchScope.ONELEVEL ) |
| { |
| return new OneLevelScopeEvaluator<ServerEntry>( db, ( ScopeNode ) node ); |
| } |
| else |
| { |
| return new SubtreeScopeEvaluator<ServerEntry>( db, ( ScopeNode ) node ); |
| } |
| case SUBSTRING: |
| return new SubstringEvaluator( ( SubstringNode ) node, db, registries ); |
| |
| /* ---------- LOGICAL OPERATORS ---------- */ |
| |
| case AND: |
| return buildAndEvaluator( ( AndNode ) node ); |
| case NOT: |
| return new NotEvaluator( ( NotNode ) node, build( ( ( NotNode ) node).getFirstChild() ) ); |
| case OR: |
| return buildOrEvaluator( ( OrNode ) node ); |
| |
| /* ---------- NOT IMPLEMENTED ---------- */ |
| |
| case ASSERTION: |
| case EXTENSIBLE: |
| throw new NotImplementedException(); |
| |
| default: |
| throw new IllegalStateException( "Unknown assertion type: " + node.getAssertionType() ); |
| } |
| } |
| |
| |
| AndEvaluator buildAndEvaluator( AndNode node ) throws Exception |
| { |
| List<ExprNode> children = node.getChildren(); |
| List<Evaluator<? extends ExprNode,ServerEntry>> evaluators = |
| new ArrayList<Evaluator<? extends ExprNode,ServerEntry>>( children.size() ); |
| for ( ExprNode child : children ) |
| { |
| evaluators.add( build( child ) ); |
| } |
| return new AndEvaluator( node, evaluators ); |
| } |
| |
| |
| OrEvaluator buildOrEvaluator( OrNode node ) throws Exception |
| { |
| List<ExprNode> children = node.getChildren(); |
| List<Evaluator<? extends ExprNode,ServerEntry>> evaluators = |
| new ArrayList<Evaluator<? extends ExprNode,ServerEntry>>( children.size() ); |
| for ( ExprNode child : children ) |
| { |
| evaluators.add( build( child ) ); |
| } |
| return new OrEvaluator( node, evaluators ); |
| } |
| } |