| /* |
| * 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.server.xdbm.ForwardIndexEntry; |
| import org.apache.directory.server.xdbm.IndexCursor; |
| import org.apache.directory.server.xdbm.IndexEntry; |
| import org.apache.directory.server.xdbm.ReverseIndexEntry; |
| import org.apache.directory.shared.i18n.I18n; |
| import org.apache.directory.shared.ldap.cursor.ClosureMonitor; |
| import org.apache.directory.shared.ldap.cursor.Cursor; |
| import org.apache.directory.shared.ldap.cursor.CursorIterator; |
| import org.apache.directory.shared.ldap.cursor.Tuple; |
| import org.apache.directory.shared.ldap.cursor.TupleCursor; |
| |
| |
| /** |
| * 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> |
| * @version $Rev$ |
| */ |
| public class IndexCursorAdaptor<K, O, ID> implements IndexCursor<K, O, ID> |
| { |
| @SuppressWarnings("unchecked") |
| final Cursor<Tuple> wrappedCursor; |
| final ForwardIndexEntry<K, O, ID> forwardEntry; |
| final ReverseIndexEntry<K, O, ID> reverseEntry; |
| |
| |
| /** |
| * 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; |
| if ( forwardIndex ) |
| { |
| forwardEntry = new ForwardIndexEntry<K, O, ID>(); |
| reverseEntry = null; |
| } |
| else |
| { |
| forwardEntry = null; |
| reverseEntry = new ReverseIndexEntry<K, O, ID>(); |
| } |
| } |
| |
| |
| public boolean available() |
| { |
| return wrappedCursor.available(); |
| } |
| |
| |
| @SuppressWarnings("unchecked") |
| public void beforeValue( ID id, K key ) throws Exception |
| { |
| if ( wrappedCursor instanceof TupleCursor ) |
| { |
| ( ( TupleCursor ) wrappedCursor ).beforeValue( key, id ); |
| } |
| } |
| |
| |
| @SuppressWarnings("unchecked") |
| public void afterValue( ID id, K key ) throws Exception |
| { |
| if ( wrappedCursor instanceof TupleCursor ) |
| { |
| ( ( TupleCursor ) wrappedCursor ).afterValue( key, id ); |
| } |
| } |
| |
| |
| public void before( IndexEntry<K, O, ID> element ) throws Exception |
| { |
| wrappedCursor.before( element.getTuple() ); |
| } |
| |
| |
| public void after( IndexEntry<K, O, ID> element ) throws Exception |
| { |
| wrappedCursor.after( element.getTuple() ); |
| } |
| |
| |
| public void beforeFirst() throws Exception |
| { |
| wrappedCursor.beforeFirst(); |
| } |
| |
| |
| public void afterLast() throws Exception |
| { |
| wrappedCursor.afterLast(); |
| } |
| |
| |
| public boolean first() throws Exception |
| { |
| return wrappedCursor.first(); |
| } |
| |
| |
| public boolean last() throws Exception |
| { |
| return wrappedCursor.last(); |
| } |
| |
| |
| public boolean isClosed() throws Exception |
| { |
| return wrappedCursor.isClosed(); |
| } |
| |
| |
| public boolean previous() throws Exception |
| { |
| return wrappedCursor.previous(); |
| } |
| |
| |
| public boolean next() throws Exception |
| { |
| return wrappedCursor.next(); |
| } |
| |
| |
| @SuppressWarnings("unchecked") |
| public IndexEntry<K, O, ID> get() throws Exception |
| { |
| if ( forwardEntry != null ) |
| { |
| Tuple<K, ID> tuple = wrappedCursor.get(); |
| forwardEntry.setTuple( tuple, null ); |
| return forwardEntry; |
| } |
| else |
| { |
| Tuple<ID, K> tuple = wrappedCursor.get(); |
| reverseEntry.setTuple( tuple, null ); |
| return reverseEntry; |
| } |
| } |
| |
| |
| public boolean isElementReused() |
| { |
| return true; |
| } |
| |
| |
| public final void setClosureMonitor( ClosureMonitor monitor ) |
| { |
| wrappedCursor.setClosureMonitor( monitor ); |
| } |
| |
| |
| public void close() throws Exception |
| { |
| wrappedCursor.close(); |
| } |
| |
| |
| public void close( Exception reason ) throws Exception |
| { |
| wrappedCursor.close( reason ); |
| } |
| |
| |
| public Iterator<IndexEntry<K, O, ID>> iterator() |
| { |
| return new CursorIterator<IndexEntry<K, O, ID>>( this ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isAfterLast() throws Exception |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName() |
| .concat( "." ).concat( "isAfterLast()" ) ) ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isBeforeFirst() throws Exception |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName() |
| .concat( "." ).concat( "isBeforeFirst()" ) ) ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isFirst() throws Exception |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName() |
| .concat( "." ).concat( "isFirst()" ) ) ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isLast() throws Exception |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName() |
| .concat( "." ).concat( "isLast()" ) ) ); |
| } |
| } |