1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 * 19 */ 20 package org.apache.directory.server.xdbm.search.impl; 21 22 import javax.naming.NamingException; 23 24 import org.apache.directory.shared.ldap.filter.BranchNode; 25 import org.apache.directory.shared.ldap.filter.ExprNode; 26 import org.apache.directory.server.xdbm.search.Optimizer; 27 28 29 /** 30 * A do nothing optimizer which labels all nodes with <code> 31 * BigInteger.valueOf( Integer.MAX_VALUE ) </code>, instead of actually 32 * taking scan counts. 33 * 34 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 35 * @version $Rev$, $Date$ 36 */ 37 public class NoOpOptimizer implements Optimizer 38 { 39 /** the maximum size for a count Integer.MAX_VALUE as a BigInteger */ 40 private static final Long MAX = Long.MAX_VALUE; 41 42 public Long annotate( ExprNode node ) throws NamingException 43 { 44 if ( node.isLeaf() ) 45 { 46 node.set( "count", MAX ); 47 return MAX; 48 } 49 50 BranchNode bnode = ( BranchNode ) node; 51 if ( bnode.getChildren().size() == 0 ) 52 { 53 bnode.set( "count", MAX ); 54 return MAX; 55 } 56 57 final int limit = bnode.getChildren().size(); 58 for ( int ii = 0; ii < limit; ii++ ) 59 { 60 ExprNode child = bnode.getChildren().get( ii ); 61 if ( child.isLeaf() ) 62 { 63 child.set( "count", MAX ); 64 } 65 else 66 { 67 annotate( child ); 68 } 69 } 70 71 bnode.set( "count", MAX ); 72 return MAX; 73 } 74 }