| /* |
| * 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.core.partition.impl.btree; |
| |
| |
| import org.apache.directory.api.ldap.model.constants.Loggers; |
| import org.apache.directory.api.ldap.model.cursor.AbstractCursor; |
| import org.apache.directory.api.ldap.model.cursor.ClosureMonitor; |
| import org.apache.directory.api.ldap.model.cursor.Cursor; |
| import org.apache.directory.api.ldap.model.cursor.CursorException; |
| 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.ExprNode; |
| import org.apache.directory.server.xdbm.IndexEntry; |
| import org.apache.directory.server.xdbm.search.Evaluator; |
| import org.apache.directory.server.xdbm.search.PartitionSearchResult; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * Adapts index cursors to return just Entry objects. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class EntryCursorAdaptor extends AbstractCursor<Entry> |
| { |
| /** A dedicated log for cursors */ |
| private static final Logger LOG_CURSOR = LoggerFactory.getLogger( Loggers.CURSOR_LOG.getName() ); |
| |
| /** Speedup for logs */ |
| private static final boolean IS_DEBUG = LOG_CURSOR.isDebugEnabled(); |
| |
| private final Cursor<IndexEntry<String, String>> indexCursor; |
| private final Evaluator<? extends ExprNode> evaluator; |
| |
| |
| public EntryCursorAdaptor( AbstractBTreePartition db, PartitionSearchResult searchResult ) |
| { |
| if ( IS_DEBUG ) |
| { |
| LOG_CURSOR.debug( "Creating EntryCursorAdaptor {}", this ); |
| } |
| |
| indexCursor = searchResult.getResultSet(); |
| evaluator = searchResult.getEvaluator(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void after( Entry element ) throws LdapException, CursorException |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void afterLast() throws LdapException, CursorException |
| { |
| this.indexCursor.afterLast(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean available() |
| { |
| return indexCursor.available(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void before( Entry element ) throws LdapException, CursorException |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void beforeFirst() throws LdapException, CursorException |
| { |
| indexCursor.beforeFirst(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public final void setClosureMonitor( ClosureMonitor monitor ) |
| { |
| indexCursor.setClosureMonitor( monitor ); |
| } |
| |
| |
| /** |
| * {@inheritDoc}} |
| */ |
| public void close() |
| { |
| if ( IS_DEBUG ) |
| { |
| LOG_CURSOR.debug( "Closing EntryCursorAdaptor {}", this ); |
| } |
| |
| indexCursor.close(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void close( Exception cause ) |
| { |
| if ( IS_DEBUG ) |
| { |
| LOG_CURSOR.debug( "Closing EntryCursorAdaptor {}", this ); |
| } |
| |
| indexCursor.close( cause ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean first() throws LdapException, CursorException |
| { |
| return indexCursor.first(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Entry get() throws CursorException |
| { |
| IndexEntry<String, String> indexEntry = indexCursor.get(); |
| |
| try |
| { |
| if ( evaluator.evaluate( indexEntry ) ) |
| { |
| Entry entry = indexEntry.getEntry(); |
| indexEntry.setEntry( null ); |
| |
| return entry; |
| } |
| else |
| { |
| indexEntry.setEntry( null ); |
| } |
| |
| return null; |
| } |
| catch ( Exception e ) |
| { |
| throw new CursorException( e.getMessage(), e ); |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isClosed() |
| { |
| return indexCursor.isClosed(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean last() throws LdapException, CursorException |
| { |
| return indexCursor.last(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean next() throws LdapException, CursorException |
| { |
| return indexCursor.next(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean previous() throws LdapException, CursorException |
| { |
| return indexCursor.previous(); |
| } |
| |
| |
| /** |
| * @see Object#toString() |
| */ |
| public String toString( String tabs ) |
| { |
| StringBuilder sb = new StringBuilder(); |
| |
| sb.append( tabs ).append( "EntryCursorAdaptor\n" ); |
| |
| if ( indexCursor != null ) |
| { |
| sb.append( tabs ).append( " " ).append( "IndexCursor : \n" ); |
| sb.append( indexCursor.toString( tabs + " " ) ); |
| } |
| |
| if ( evaluator != null ) |
| { |
| sb.append( tabs ).append( " " ).append( "Evaluator : \n" ); |
| sb.append( evaluator.toString( tabs + " " ) ); |
| } |
| |
| return sb.toString(); |
| } |
| |
| |
| /** |
| * @see Object#toString() |
| */ |
| public String toString() |
| { |
| return toString( "" ); |
| } |
| } |