| /* |
| * 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.evaluator; |
| |
| |
| import java.util.Iterator; |
| |
| import org.apache.directory.api.ldap.model.constants.SchemaConstants; |
| import org.apache.directory.api.ldap.model.entry.Attribute; |
| import org.apache.directory.api.ldap.model.entry.Entry; |
| import org.apache.directory.api.ldap.model.exception.LdapException; |
| import org.apache.directory.api.ldap.model.filter.PresenceNode; |
| import org.apache.directory.api.ldap.model.schema.AttributeType; |
| import org.apache.directory.api.ldap.model.schema.SchemaManager; |
| import org.apache.directory.server.xdbm.Index; |
| import org.apache.directory.server.xdbm.IndexEntry; |
| import org.apache.directory.server.xdbm.Store; |
| import org.apache.directory.server.xdbm.search.Evaluator; |
| |
| |
| /** |
| * An Evaluator which determines if candidates are matched by GreaterEqNode |
| * assertions. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class PresenceEvaluator implements Evaluator<PresenceNode> |
| { |
| /** The ExprNode to evaluate */ |
| private final PresenceNode node; |
| |
| /** The backend */ |
| private final Store db; |
| |
| /** The AttributeType we will use for the evaluation */ |
| private final AttributeType attributeType; |
| |
| /** The SchemaManager instance */ |
| private final SchemaManager schemaManager; |
| |
| /** The index to use if any */ |
| private final Index<String, String> idx; |
| |
| |
| public PresenceEvaluator( PresenceNode node, Store db, SchemaManager schemaManager ) |
| throws Exception |
| { |
| this.db = db; |
| this.node = node; |
| this.schemaManager = schemaManager; |
| this.attributeType = node.getAttributeType(); |
| |
| if ( db.hasUserIndexOn( attributeType ) ) |
| { |
| idx = db.getPresenceIndex(); |
| } |
| else |
| { |
| idx = null; |
| } |
| } |
| |
| |
| public PresenceNode getExpression() |
| { |
| return node; |
| } |
| |
| |
| public AttributeType getAttributeType() |
| { |
| return attributeType; |
| } |
| |
| |
| // TODO - determine if comparator and index entry should have the Value |
| // wrapper or the raw normalized value |
| public boolean evaluate( IndexEntry<?, String> indexEntry ) throws LdapException |
| { |
| Entry entry = indexEntry.getEntry(); |
| |
| // resuscitate the entry if it has not been and set entry in IndexEntry |
| if ( null == entry ) |
| { |
| entry = db.fetch( indexEntry.getId() ); |
| |
| if ( null == entry ) |
| { |
| // The entry is not anymore present : get out |
| return false; |
| } |
| |
| indexEntry.setEntry( entry ); |
| } |
| |
| return evaluate( entry ); |
| } |
| |
| |
| // TODO - determine if comaparator and index entry should have the Value |
| // wrapper or the raw normalized value |
| public boolean evaluate( Entry entry ) throws LdapException |
| { |
| String attrOid = attributeType.getOid(); |
| |
| if ( attrOid.equals( SchemaConstants.OBJECT_CLASS_AT_OID ) |
| || attrOid.equals( SchemaConstants.ENTRY_CSN_AT_OID ) |
| || attrOid.equals( SchemaConstants.ENTRY_UUID_AT_OID ) ) |
| { |
| // we don't maintain a presence index for objectClass, entryUUID and entryCSN |
| // however as every entry has such an attribute this evaluator always evaluates to true |
| return true; |
| } |
| |
| // get the attribute |
| Attribute attr = entry.get( attributeType ); |
| |
| // if the attribute exists just return true |
| if ( attr != null ) |
| { |
| return true; |
| } |
| |
| // If we do not have the attribute, loop through the sub classes of |
| // the attributeType. Perhaps the entry has an attribute value of a |
| // subtype (descendant) that will produce a match |
| if ( schemaManager.getAttributeTypeRegistry().hasDescendants( attributeType ) ) |
| { |
| // TODO check to see if descendant handling is necessary for the |
| // index so we can match properly even when for example a name |
| // attribute is used instead of more specific commonName |
| Iterator<AttributeType> descendants = schemaManager.getAttributeTypeRegistry().descendants( attributeType ); |
| |
| do |
| { |
| AttributeType descendant = descendants.next(); |
| |
| attr = entry.get( descendant ); |
| |
| if ( attr != null ) |
| { |
| return true; |
| } |
| } |
| while ( descendants.hasNext() ); |
| } |
| |
| // we fell through so a match was not found - assertion was false. |
| return false; |
| } |
| |
| |
| /** |
| * @see Object#toString() |
| */ |
| public String toString( String tabs ) |
| { |
| StringBuilder sb = new StringBuilder(); |
| |
| sb.append( tabs ).append( "PresenceEvaluator : " ).append( node ).append( "\n" ); |
| |
| return sb.toString(); |
| } |
| |
| |
| /** |
| * @see Object#toString() |
| */ |
| public String toString() |
| { |
| return toString( "" ); |
| } |
| } |