| /* |
| * 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.impl.avl; |
| |
| |
| import java.net.URI; |
| |
| import org.apache.directory.api.ldap.model.cursor.Cursor; |
| import org.apache.directory.api.ldap.model.cursor.EmptyCursor; |
| import org.apache.directory.api.ldap.model.cursor.Tuple; |
| import org.apache.directory.api.ldap.model.exception.LdapException; |
| import org.apache.directory.api.ldap.model.schema.AttributeType; |
| import org.apache.directory.api.ldap.model.schema.LdapComparator; |
| import org.apache.directory.api.ldap.model.schema.MatchingRule; |
| import org.apache.directory.api.ldap.model.schema.Normalizer; |
| import org.apache.directory.api.ldap.model.schema.SchemaManager; |
| import org.apache.directory.api.ldap.model.schema.comparators.UuidComparator; |
| import org.apache.directory.server.core.partition.impl.btree.IndexCursorAdaptor; |
| import org.apache.directory.server.i18n.I18n; |
| import org.apache.directory.server.xdbm.AbstractIndex; |
| import org.apache.directory.server.xdbm.EmptyIndexCursor; |
| import org.apache.directory.server.xdbm.IndexEntry; |
| |
| |
| /** |
| * An Index backed by an AVL Tree. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class AvlIndex<K> extends AbstractIndex<K, String> |
| { |
| protected Normalizer normalizer; |
| protected AvlTable<K, String> forward; |
| protected AvlTable<String, K> reverse; |
| |
| |
| public AvlIndex() |
| { |
| super( true ); |
| } |
| |
| |
| public AvlIndex( String attributeId ) |
| { |
| super( attributeId, true ); |
| } |
| |
| |
| public AvlIndex( String attributeId, boolean withReverse ) |
| { |
| super( attributeId, withReverse ); |
| } |
| |
| |
| public void init( SchemaManager schemaManager, AttributeType attributeType ) throws Exception |
| { |
| this.attributeType = attributeType; |
| |
| MatchingRule mr = attributeType.getEquality(); |
| |
| if ( mr == null ) |
| { |
| mr = attributeType.getOrdering(); |
| } |
| |
| if ( mr == null ) |
| { |
| mr = attributeType.getSubstring(); |
| } |
| |
| normalizer = mr.getNormalizer(); |
| |
| if ( normalizer == null ) |
| { |
| throw new Exception( I18n.err( I18n.ERR_212, attributeType ) ); |
| } |
| |
| LdapComparator<K> comp = ( LdapComparator<K> ) mr.getLdapComparator(); |
| |
| /* |
| * The forward key/value map stores attribute values to master table |
| * primary keys. A value for an attribute can occur several times in |
| * different entries so the forward map can have more than one value. |
| */ |
| forward = new AvlTable<K, String>( attributeType.getName(), comp, UuidComparator.INSTANCE, true ); |
| |
| /* |
| * Now the reverse map stores the primary key into the master table as |
| * the key and the values of attributes as the value. If an attribute |
| * is single valued according to its specification based on a schema |
| * then duplicate keys should not be allowed within the reverse table. |
| */ |
| if ( withReverse ) |
| { |
| if ( attributeType.isSingleValued() ) |
| { |
| reverse = new AvlTable<String, K>( attributeType.getName(), UuidComparator.INSTANCE, comp, false ); |
| } |
| else |
| { |
| reverse = new AvlTable<String, K>( attributeType.getName(), UuidComparator.INSTANCE, comp, true ); |
| } |
| } |
| } |
| |
| |
| public void add( K attrVal, String id ) throws Exception |
| { |
| forward.put( attrVal, id ); |
| |
| if ( withReverse ) |
| { |
| reverse.put( id, attrVal ); |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void close() throws Exception |
| { |
| if ( forward != null ) |
| { |
| forward.close(); |
| } |
| |
| if ( reverse != null ) |
| { |
| reverse.close(); |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public long count() throws Exception |
| { |
| return forward.count(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public long count( K attrVal ) throws Exception |
| { |
| return forward.count( attrVal ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void drop( String id ) throws Exception |
| { |
| if ( withReverse ) |
| { |
| if ( isDupsEnabled() ) |
| { |
| Cursor<Tuple<String, K>> cursor = reverse.cursor( id ); |
| |
| while ( cursor.next() ) |
| { |
| Tuple<String, K> tuple = cursor.get(); |
| forward.remove( tuple.getValue(), id ); |
| } |
| |
| cursor.close(); |
| |
| } |
| else |
| { |
| K key = reverse.get( id ); |
| forward.remove( key ); |
| } |
| |
| reverse.remove( id ); |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void drop( K attrVal, String id ) throws Exception |
| { |
| forward.remove( attrVal, id ); |
| |
| if ( withReverse ) |
| { |
| reverse.remove( id, attrVal ); |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean forward( K attrVal ) throws Exception |
| { |
| return forward.has( attrVal ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean forward( K attrVal, String id ) throws LdapException |
| { |
| return forward.has( attrVal, id ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @SuppressWarnings("unchecked") |
| public Cursor<IndexEntry<K, String>> forwardCursor() throws LdapException |
| { |
| return new IndexCursorAdaptor( forward.cursor(), true ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @SuppressWarnings("unchecked") |
| public Cursor<IndexEntry<K, String>> forwardCursor( K key ) throws Exception |
| { |
| return new IndexCursorAdaptor( forward.cursor( key ), true ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public String forwardLookup( K attrVal ) throws Exception |
| { |
| return forward.get( attrVal ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Cursor<String> forwardValueCursor( K key ) throws Exception |
| { |
| return forward.valueCursor( key ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public long greaterThanCount( K attrVal ) throws Exception |
| { |
| return forward.greaterThanCount( attrVal ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public long lessThanCount( K attrVal ) throws Exception |
| { |
| return forward.lessThanCount( attrVal ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean reverse( String id ) throws Exception |
| { |
| if ( withReverse ) |
| { |
| return reverse.has( id ); |
| } |
| else |
| { |
| return false; |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean reverse( String id, K attrVal ) throws Exception |
| { |
| if ( withReverse ) |
| { |
| return reverse.has( id, attrVal ); |
| } |
| else |
| { |
| return false; |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @SuppressWarnings("unchecked") |
| public Cursor<IndexEntry<K, String>> reverseCursor() throws Exception |
| { |
| if ( withReverse ) |
| { |
| return new IndexCursorAdaptor( reverse.cursor(), false ); |
| } |
| else |
| { |
| return new EmptyIndexCursor<K>(); |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @SuppressWarnings("unchecked") |
| public Cursor<IndexEntry<K, String>> reverseCursor( String id ) throws Exception |
| { |
| if ( withReverse ) |
| { |
| return new IndexCursorAdaptor( reverse.cursor( id ), false ); |
| } |
| else |
| { |
| return new EmptyIndexCursor<K>(); |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public K reverseLookup( String id ) throws LdapException |
| { |
| if ( withReverse ) |
| { |
| return reverse.get( id ); |
| } |
| else |
| { |
| return null; |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Cursor<K> reverseValueCursor( String id ) throws Exception |
| { |
| if ( withReverse ) |
| { |
| return reverse.valueCursor( id ); |
| } |
| else |
| { |
| return new EmptyCursor<K>(); |
| } |
| } |
| |
| |
| /** |
| * throws UnsupportedOperationException cause it is a in-memory index |
| */ |
| public void setWkDirPath( URI wkDirPath ) |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_213 ) ); |
| } |
| |
| |
| /** |
| * this method always returns null for AvlIndex cause this is a in-memory index. |
| */ |
| public URI getWkDirPath() |
| { |
| return null; |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isDupsEnabled() |
| { |
| if ( withReverse ) |
| { |
| return reverse.isDupsEnabled(); |
| } |
| else |
| { |
| return false; |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void sync() throws Exception |
| { |
| } |
| } |