| /* |
| * 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 java.util.Iterator; |
| |
| import org.apache.directory.api.i18n.I18n; |
| import org.apache.directory.api.ldap.model.constants.Loggers; |
| 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.cursor.CursorIterator; |
| import org.apache.directory.api.ldap.model.cursor.Tuple; |
| import org.apache.directory.api.ldap.model.exception.LdapException; |
| import org.apache.directory.server.xdbm.AbstractIndexCursor; |
| import org.apache.directory.server.xdbm.IndexEntry; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * A Cursor which adapts an underlying Tuple based Cursor to one which returns |
| * IndexEntry objects rather than tuples. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class IndexCursorAdaptor<K> extends AbstractIndexCursor<K> |
| { |
| /** 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(); |
| |
| @SuppressWarnings("unchecked") |
| final Cursor<Tuple> wrappedCursor; |
| final IndexEntry<K, String> forwardEntry; |
| |
| |
| /** |
| * Creates an IndexCursorAdaptor which wraps and adapts a Cursor from a table to |
| * one which returns an IndexEntry. |
| * |
| * @param wrappedCursor the Cursor being adapted |
| * @param forwardIndex true for a cursor over a forward index, false for |
| * one over a reverse index |
| */ |
| @SuppressWarnings("unchecked") |
| public IndexCursorAdaptor( Cursor<Tuple> wrappedCursor, boolean forwardIndex ) |
| { |
| this.wrappedCursor = wrappedCursor; |
| |
| forwardEntry = new IndexEntry<K, String>(); |
| |
| if ( IS_DEBUG ) |
| { |
| LOG_CURSOR.debug( "Creating IndexCursorAdaptor {}", this ); |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean available() |
| { |
| return wrappedCursor.available(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void before( IndexEntry<K, String> element ) throws LdapException, CursorException |
| { |
| wrappedCursor.before( element.getTuple() ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void after( IndexEntry<K, String> element ) throws LdapException, CursorException |
| { |
| wrappedCursor.after( element.getTuple() ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void beforeFirst() throws LdapException, CursorException |
| { |
| wrappedCursor.beforeFirst(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void afterLast() throws LdapException, CursorException |
| { |
| wrappedCursor.afterLast(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean first() throws LdapException, CursorException |
| { |
| return wrappedCursor.first(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean last() throws LdapException, CursorException |
| { |
| return wrappedCursor.last(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isClosed() |
| { |
| return wrappedCursor.isClosed(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean previous() throws LdapException, CursorException |
| { |
| return wrappedCursor.previous(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean next() throws LdapException, CursorException |
| { |
| return wrappedCursor.next(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @SuppressWarnings("unchecked") |
| public IndexEntry<K, String> get() throws CursorException |
| { |
| Tuple<K, String> tuple = wrappedCursor.get(); |
| forwardEntry.setTuple( tuple ); |
| |
| return forwardEntry; |
| } |
| |
| |
| public final void setClosureMonitor( ClosureMonitor monitor ) |
| { |
| wrappedCursor.setClosureMonitor( monitor ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void close() |
| { |
| if ( IS_DEBUG ) |
| { |
| LOG_CURSOR.debug( "Closing IndexCursorAdaptor {}", this ); |
| } |
| |
| wrappedCursor.close(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void close( Exception reason ) |
| { |
| if ( IS_DEBUG ) |
| { |
| LOG_CURSOR.debug( "Closing IndexCursorAdaptor {}", this ); |
| } |
| |
| wrappedCursor.close( reason ); |
| } |
| |
| |
| public Iterator<IndexEntry<K, String>> iterator() |
| { |
| return new CursorIterator<IndexEntry<K, String>>( this ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isAfterLast() |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName() |
| .concat( "." ).concat( "isAfterLast()" ) ) ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isBeforeFirst() |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName() |
| .concat( "." ).concat( "isBeforeFirst()" ) ) ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isFirst() |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName() |
| .concat( "." ).concat( "isFirst()" ) ) ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isLast() |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName() |
| .concat( "." ).concat( "isLast()" ) ) ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| protected String getUnsupportedMessage() |
| { |
| return UNSUPPORTED_MSG; |
| } |
| |
| |
| /** |
| * @see Object#toString() |
| */ |
| public String toString( String tabs ) |
| { |
| StringBuilder sb = new StringBuilder(); |
| |
| sb.append( tabs ).append( "IndexCursorAdaptor (" ); |
| |
| if ( available() ) |
| { |
| sb.append( "available)" ); |
| } |
| else |
| { |
| sb.append( "absent)" ); |
| } |
| |
| sb.append( " :\n" ); |
| |
| sb.append( wrappedCursor.toString( tabs + " " ) ); |
| |
| return sb.toString(); |
| } |
| |
| |
| /** |
| * @see Object#toString() |
| */ |
| public String toString() |
| { |
| return toString( "" ); |
| } |
| } |