| /* |
| * 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 java.util.HashSet; |
| import java.util.Set; |
| |
| import net.sf.ehcache.Element; |
| |
| import org.apache.directory.api.ldap.model.cursor.Cursor; |
| import org.apache.directory.api.ldap.model.entry.Entry; |
| import org.apache.directory.api.ldap.model.exception.LdapNoSuchObjectException; |
| import org.apache.directory.api.ldap.model.filter.AndNode; |
| import org.apache.directory.api.ldap.model.filter.ExprNode; |
| import org.apache.directory.api.ldap.model.filter.ObjectClassNode; |
| import org.apache.directory.api.ldap.model.filter.ScopeNode; |
| import org.apache.directory.api.ldap.model.message.AliasDerefMode; |
| import org.apache.directory.api.ldap.model.message.SearchScope; |
| import org.apache.directory.api.ldap.model.name.Dn; |
| import org.apache.directory.api.ldap.model.schema.SchemaManager; |
| import org.apache.directory.server.core.api.interceptor.context.SearchOperationContext; |
| import org.apache.directory.server.core.api.partition.Partition; |
| import org.apache.directory.server.core.partition.impl.btree.IndexCursorAdaptor; |
| import org.apache.directory.server.i18n.I18n; |
| import org.apache.directory.server.xdbm.IndexEntry; |
| import org.apache.directory.server.xdbm.Store; |
| import org.apache.directory.server.xdbm.search.Evaluator; |
| import org.apache.directory.server.xdbm.search.Optimizer; |
| import org.apache.directory.server.xdbm.search.PartitionSearchResult; |
| import org.apache.directory.server.xdbm.search.SearchEngine; |
| import org.apache.directory.server.xdbm.search.evaluator.BaseLevelScopeEvaluator; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * Given a search filter and a scope the search engine identifies valid |
| * candidate entries returning their ids. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class DefaultSearchEngine implements SearchEngine |
| { |
| /** The logger */ |
| private static final Logger LOG = LoggerFactory.getLogger( DefaultSearchEngine.class ); |
| |
| /** the Optimizer used by this DefaultSearchEngine */ |
| private final Optimizer optimizer; |
| |
| /** the Database this DefaultSearchEngine operates on */ |
| private final Store db; |
| |
| /** creates Cursors over entries satisfying filter expressions */ |
| private final CursorBuilder cursorBuilder; |
| |
| /** creates evaluators which check to see if candidates satisfy a filter expression */ |
| private final EvaluatorBuilder evaluatorBuilder; |
| |
| |
| // ------------------------------------------------------------------------ |
| // C O N S T R U C T O R S |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Creates a DefaultSearchEngine for searching a Database without setting |
| * up the database. |
| * @param db the btree based partition |
| * @param cursorBuilder an expression cursor builder |
| * @param evaluatorBuilder an expression evaluator builder |
| * @param optimizer an optimizer to use during search |
| */ |
| public DefaultSearchEngine( Store db, CursorBuilder cursorBuilder, |
| EvaluatorBuilder evaluatorBuilder, Optimizer optimizer ) |
| { |
| this.db = db; |
| this.optimizer = optimizer; |
| this.cursorBuilder = cursorBuilder; |
| this.evaluatorBuilder = evaluatorBuilder; |
| } |
| |
| |
| /** |
| * Gets the optimizer for this DefaultSearchEngine. |
| * |
| * @return the optimizer |
| */ |
| public Optimizer getOptimizer() |
| { |
| return optimizer; |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public PartitionSearchResult computeResult( SchemaManager schemaManager, SearchOperationContext searchContext ) |
| throws Exception |
| { |
| SearchScope scope = searchContext.getScope(); |
| Dn baseDn = searchContext.getDn(); |
| AliasDerefMode aliasDerefMode = searchContext.getAliasDerefMode(); |
| ExprNode filter = searchContext.getFilter(); |
| |
| // Compute the UUID of the baseDN entry |
| String baseId = db.getEntryId( baseDn ); |
| |
| // Prepare the instance containing the search result |
| PartitionSearchResult searchResult = new PartitionSearchResult( schemaManager ); |
| Set<IndexEntry<String, String>> resultSet = new HashSet<IndexEntry<String, String>>(); |
| |
| // Check that we have an entry, otherwise we can immediately get out |
| if ( baseId == null ) |
| { |
| if ( ( ( Partition ) db ).getSuffixDn().equals( baseDn ) ) |
| { |
| // The context entry is not created yet, return an empty result |
| searchResult.setResultSet( resultSet ); |
| |
| return searchResult; |
| } |
| else |
| { |
| // The search base doesn't exist |
| throw new LdapNoSuchObjectException( I18n.err( I18n.ERR_648, baseDn ) ); |
| } |
| } |
| |
| // -------------------------------------------------------------------- |
| // Determine the effective base with aliases |
| // -------------------------------------------------------------------- |
| Dn aliasedBase = null; |
| |
| |
| if ( db.getAliasCache() != null ) |
| { |
| Element aliasBaseElement = db.getAliasCache().get( baseId ); |
| |
| if ( aliasBaseElement != null ) |
| { |
| aliasedBase = (Dn)(aliasBaseElement).getObjectValue(); |
| } |
| } |
| else |
| { |
| aliasedBase = db.getAliasIndex().reverseLookup( baseId ); |
| } |
| |
| Dn effectiveBase = baseDn; |
| String effectiveBaseId = baseId; |
| |
| if ( ( aliasedBase != null ) && aliasDerefMode.isDerefFindingBase() ) |
| { |
| /* |
| * If the base is an alias and alias dereferencing does occur on |
| * finding the base, or always then we set the effective base to the alias target |
| * got from the alias index. |
| */ |
| effectiveBase = aliasedBase.apply( schemaManager ); |
| effectiveBaseId = db.getEntryId( effectiveBase ); |
| } |
| |
| // -------------------------------------------------------------------- |
| // Specifically Handle Object Level Scope |
| // -------------------------------------------------------------------- |
| if ( scope == SearchScope.OBJECT ) |
| { |
| IndexEntry<String, String> indexEntry = new IndexEntry<String, String>(); |
| indexEntry.setId( effectiveBaseId ); |
| |
| // Fetch the entry, as we have only one |
| Entry entry = db.fetch( indexEntry.getId(), effectiveBase ); |
| |
| Evaluator<? extends ExprNode> evaluator = null; |
| |
| if ( filter instanceof ObjectClassNode ) |
| { |
| ScopeNode node = new ScopeNode( aliasDerefMode, effectiveBase, effectiveBaseId, scope ); |
| evaluator = new BaseLevelScopeEvaluator<Entry>( db, node ); |
| } |
| else |
| { |
| optimizer.annotate( filter ); |
| evaluator = evaluatorBuilder.build( filter ); |
| |
| // Special case if the filter selects no candidate |
| if ( evaluator == null ) |
| { |
| ScopeNode node = new ScopeNode( aliasDerefMode, effectiveBase, effectiveBaseId, scope ); |
| evaluator = new BaseLevelScopeEvaluator<Entry>( db, node ); |
| } |
| } |
| |
| indexEntry.setEntry( entry ); |
| resultSet.add( indexEntry ); |
| |
| searchResult.setEvaluator( evaluator ); |
| searchResult.setResultSet( resultSet ); |
| |
| return searchResult; |
| } |
| |
| // This is not a BaseObject scope search. |
| |
| // Add the scope node using the effective base to the filter |
| ExprNode root = null; |
| |
| if ( filter instanceof ObjectClassNode ) |
| { |
| root = new ScopeNode( aliasDerefMode, effectiveBase, effectiveBaseId, scope ); |
| } |
| else |
| { |
| root = new AndNode(); |
| ( ( AndNode ) root ).getChildren().add( filter ); |
| ExprNode node = new ScopeNode( aliasDerefMode, effectiveBase, effectiveBaseId, scope ); |
| ( ( AndNode ) root ).getChildren().add( node ); |
| } |
| |
| // Annotate the node with the optimizer and return search enumeration. |
| optimizer.annotate( root ); |
| Evaluator<? extends ExprNode> evaluator = evaluatorBuilder.build( root ); |
| |
| Set<String> uuidSet = new HashSet<String>(); |
| searchResult.setAliasDerefMode( aliasDerefMode ); |
| searchResult.setCandidateSet( uuidSet ); |
| |
| long nbResults = cursorBuilder.build( root, searchResult ); |
| |
| LOG.debug( "Nb results : {} for filter : {}", nbResults, root ); |
| |
| if ( nbResults < Long.MAX_VALUE ) |
| { |
| for ( String uuid : uuidSet ) |
| { |
| IndexEntry<String, String> indexEntry = new IndexEntry<String, String>(); |
| indexEntry.setId( uuid ); |
| resultSet.add( indexEntry ); |
| } |
| } |
| else |
| { |
| // Full scan : use the MasterTable |
| Cursor<IndexEntry<String, String>> cursor = new IndexCursorAdaptor( db.getMasterTable().cursor(), true ); |
| |
| while ( cursor.next() ) |
| { |
| IndexEntry<String, String> indexEntry = cursor.get(); |
| |
| // Here, the indexEntry contains a <UUID, Entry> tuple. Convert it to <UUID, UUID> |
| IndexEntry<String, String> forwardIndexEntry = new IndexEntry<String, String>(); |
| forwardIndexEntry.setKey( indexEntry.getKey() ); |
| forwardIndexEntry.setId( indexEntry.getKey() ); |
| forwardIndexEntry.setEntry( null ); |
| |
| resultSet.add( forwardIndexEntry ); |
| } |
| } |
| |
| searchResult.setEvaluator( evaluator ); |
| searchResult.setResultSet( resultSet ); |
| |
| return searchResult; |
| } |
| |
| |
| /** |
| * @see SearchEngine#evaluator(ExprNode) |
| */ |
| public Evaluator<? extends ExprNode> evaluator( ExprNode filter ) throws Exception |
| { |
| return evaluatorBuilder.build( filter ); |
| } |
| } |