| /* |
| * 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 javax.naming.NamingException; |
| |
| import org.apache.directory.api.ldap.model.filter.BranchNode; |
| import org.apache.directory.api.ldap.model.filter.ExprNode; |
| import org.apache.directory.server.xdbm.search.Optimizer; |
| |
| |
| /** |
| * A do nothing optimizer which labels all nodes with <code> |
| * BigInteger.valueOf( Integer.MAX_VALUE ) </code>, instead of actually |
| * taking scan counts. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class NoOpOptimizer implements Optimizer |
| { |
| /** the maximum size for a count Integer.MAX_VALUE as a BigInteger */ |
| private static final Long MAX = Long.MAX_VALUE; |
| |
| |
| public Long annotate( ExprNode node ) throws NamingException |
| { |
| if ( node.isLeaf() ) |
| { |
| node.set( "count", MAX ); |
| return MAX; |
| } |
| |
| BranchNode bnode = ( BranchNode ) node; |
| if ( bnode.getChildren().size() == 0 ) |
| { |
| bnode.set( "count", MAX ); |
| return MAX; |
| } |
| |
| final int limit = bnode.getChildren().size(); |
| for ( int ii = 0; ii < limit; ii++ ) |
| { |
| ExprNode child = bnode.getChildren().get( ii ); |
| if ( child.isLeaf() ) |
| { |
| child.set( "count", MAX ); |
| } |
| else |
| { |
| annotate( child ); |
| } |
| } |
| |
| bnode.set( "count", MAX ); |
| return MAX; |
| } |
| } |