| /* |
| * 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.shared; |
| |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.NoSuchElementException; |
| |
| import jdbm.RecordManager; |
| import jdbm.btree.BTree; |
| import jdbm.helper.Tuple; |
| import jdbm.helper.TupleBrowser; |
| |
| import org.apache.directory.api.ldap.model.cursor.AbstractCursor; |
| import org.apache.directory.api.ldap.model.cursor.CursorException; |
| import org.apache.directory.api.ldap.model.cursor.InvalidCursorPositionException; |
| import org.apache.directory.api.ldap.model.entry.Entry; |
| import org.apache.directory.api.ldap.model.exception.LdapException; |
| import org.apache.directory.server.core.api.filtering.EntryFilter; |
| import org.apache.directory.server.core.api.filtering.EntryFilteringCursor; |
| import org.apache.directory.server.core.api.interceptor.context.SearchOperationContext; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * Cursor for sorted entries. |
| * |
| * Note: This currently uses JDBM, but will be migrated to use Mavibot |
| * when ready. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class SortedEntryCursor extends AbstractCursor<Entry> implements EntryFilteringCursor |
| { |
| |
| private static final Logger LOG = LoggerFactory.getLogger( SortedEntryCursor.class ); |
| |
| private TupleBrowser browser; |
| |
| private final Tuple tuple = new Tuple(); |
| |
| private RecordManager recMan; |
| |
| private File dataFile; |
| |
| private BTree<Entry, String> btree; |
| |
| |
| public SortedEntryCursor( BTree<Entry, String> btree, RecordManager recMan, File dataFile ) throws IOException |
| { |
| this.recMan = recMan; |
| this.dataFile = dataFile; |
| this.btree = btree; |
| browser = btree.browse(); |
| } |
| |
| |
| @Override |
| public boolean available() |
| { |
| return tuple.getKey() != null; |
| } |
| |
| |
| @Override |
| public void before( Entry element ) throws LdapException, CursorException |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| |
| @Override |
| public void after( Entry element ) throws LdapException, CursorException |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| |
| @Override |
| public void beforeFirst() throws LdapException, CursorException |
| { |
| try |
| { |
| clearValue(); |
| browser = btree.browse(); |
| } |
| catch ( IOException e ) |
| { |
| throw new CursorException( e ); |
| } |
| } |
| |
| |
| @Override |
| public void afterLast() throws LdapException, CursorException |
| { |
| try |
| { |
| clearValue(); |
| browser = btree.browse( null ); |
| } |
| catch ( IOException e ) |
| { |
| throw new CursorException( e ); |
| } |
| |
| } |
| |
| |
| @Override |
| public boolean first() throws LdapException, CursorException |
| { |
| beforeFirst(); |
| return next(); |
| } |
| |
| |
| @Override |
| public boolean last() throws LdapException, CursorException |
| { |
| afterLast(); |
| return previous(); |
| } |
| |
| |
| @Override |
| public boolean previous() throws LdapException, CursorException |
| { |
| try |
| { |
| |
| if ( browser == null ) |
| { |
| browser = btree.browse( null ); |
| } |
| |
| if ( browser.getPrevious( tuple ) ) |
| { |
| return true; |
| } |
| } |
| catch ( IOException e ) |
| { |
| throw new CursorException( e ); |
| } |
| catch ( NoSuchElementException e ) |
| { |
| // ignore this is due to the call wrapped.prev() |
| // instead of doing a check like if(wrapped.hasPrev()) |
| } |
| |
| clearValue(); |
| return false; |
| } |
| |
| |
| @Override |
| public boolean next() throws LdapException, CursorException |
| { |
| try |
| { |
| if ( browser == null ) |
| { |
| browser = btree.browse(); |
| } |
| |
| if ( browser.getNext( tuple ) ) |
| { |
| return true; |
| } |
| } |
| catch ( IOException e ) |
| { |
| throw new CursorException( e ); |
| } |
| catch ( NoSuchElementException e ) |
| { |
| // ignore, this is due to the call wrapped.prev() |
| // instead of doing a check like if(wrapped.hasNext()) |
| } |
| |
| clearValue(); |
| return false; |
| } |
| |
| |
| @Override |
| public Entry get() throws CursorException |
| { |
| if ( tuple.getKey() == null ) |
| { |
| throw new InvalidCursorPositionException(); |
| } |
| |
| return ( Entry ) tuple.getKey(); |
| } |
| |
| |
| @Override |
| public void close() throws IOException |
| { |
| deleteFile(); |
| super.close(); |
| } |
| |
| |
| @Override |
| public void close( Exception cause ) throws IOException |
| { |
| deleteFile(); |
| super.close( cause ); |
| } |
| |
| |
| @Override |
| public boolean addEntryFilter( EntryFilter filter ) |
| { |
| return false; |
| } |
| |
| |
| @Override |
| public List<EntryFilter> getEntryFilters() |
| { |
| return null; |
| } |
| |
| |
| @Override |
| public SearchOperationContext getOperationContext() |
| { |
| return null; |
| } |
| |
| |
| private void clearValue() |
| { |
| tuple.setKey( null ); |
| tuple.setValue( null ); |
| } |
| |
| |
| private void deleteFile() |
| { |
| if ( recMan == null ) |
| { |
| return; |
| } |
| |
| try |
| { |
| recMan.close(); |
| dataFile.delete(); |
| } |
| catch ( IOException e ) |
| { |
| LOG.warn( "Failed to delete the sorted entry data file {}", dataFile, e ); |
| } |
| } |
| } |