/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying * information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2006 Sun Microsystems, Inc.
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*/
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package org.opends.server.backends;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.LinkedHashMap;
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import java.util.LinkedList;
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import org.opends.server.api.Backend;
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import org.opends.server.config.ConfigEntry;
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import org.opends.server.config.ConfigException;
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import org.opends.server.core.AddOperation;
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import org.opends.server.core.DeleteOperation;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.core.ModifyOperation;
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import org.opends.server.core.ModifyDNOperation;
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import org.opends.server.core.SearchOperation;
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import org.opends.server.types.BackupConfig;
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import org.opends.server.types.BackupDirectory;
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import org.opends.server.types.Control;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.DN;
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import org.opends.server.types.Entry;
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import org.opends.server.types.LDIFExportConfig;
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import org.opends.server.types.LDIFImportConfig;
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import org.opends.server.types.RestoreConfig;
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import org.opends.server.types.ResultCode;
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import org.opends.server.types.SearchScope;
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import org.opends.server.types.SearchFilter;
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import org.opends.server.util.LDIFException;
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import org.opends.server.util.LDIFReader;
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import org.opends.server.util.LDIFWriter;
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import static org.opends.server.loggers.Debug.*;
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import static org.opends.server.messages.BackendMessages.*;
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import static org.opends.server.messages.MessageHandler.*;
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import static org.opends.server.util.ServerConstants.*;
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/**
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* This class defines a very simple backend that stores its information in
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* memory. This is primarily intended for testing purposes with small data
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* sets, as it does not have any indexing mechanism such as would be required to
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* achieve high performance with large data sets. It is also heavily
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* synchronized for simplicity at the expense of performance, rather than
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* providing a more fine-grained locking mechanism.
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* <BR><BR>
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* Entries stored in this backend are held in a
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* <CODE>LinkedHashMap<DN,Entry></CODE> object, which ensures that the
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* order in which you iterate over the entries is the same as the order in which
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* they were inserted. By combining this with the constraint that no entry can
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* be added before its parent, you can ensure that iterating through the entries
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* will always process the parent entries before their children, which is
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* important for both search result processing and LDIF exports.
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* <BR><BR>
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* As mentioned above, no data indexing is performed, so all non-baseObject
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* searches require iteration through the entire data set. If this is to become
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* a more general-purpose backend, then additional
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* <CODE>HashMap<ByteString,Set<DN>></CODE> objects could be used
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* to provide that capability.
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* <BR><BR>
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* There is actually one index that does get maintained within this backend,
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* which is a mapping between the DN of an entry and the DNs of any immediate
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* children of that entry. This is needed to efficiently determine whether an
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* entry has any children (which must not be the case for delete operations).
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* Modify DN operations are not currently allowed, but if such support is added
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* in the future, then this mapping would play an integral role in that process
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* as well.
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*/
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public class MemoryBackend
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extends Backend
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{
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/**
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* The fully-qualified name of this class for debugging purposes.
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*/
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private static final String CLASS_NAME =
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"org.opends.server.backends.MemoryBackend";
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// The base DNs for this backend.
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private DN[] baseDNs;
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// The mapping between parent DNs and their immediate children.
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private HashMap<DN,HashSet<DN>> childDNs;
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// The base DNs for this backend, in a hash set.
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private HashSet<DN> baseDNSet;
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// The set of supported controls for this backend.
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private HashSet<String> supportedControls;
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// The set of supported features for this backend.
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private HashSet<String> supportedFeatures;
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// The mapping between entry DNs and the corresponding entries.
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private LinkedHashMap<DN,Entry> entryMap;
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/**
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* Creates a new backend with the provided information. All backend
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* implementations must implement a default constructor that use
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* <CODE>super()</CODE> to invoke this constructor.
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*/
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public MemoryBackend()
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{
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super();
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assert debugConstructor(CLASS_NAME);
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// Perform all initialization in initializeBackend.
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized void initializeBackend(ConfigEntry configEntry,
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DN[] baseDNs)
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throws ConfigException
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{
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assert debugEnter(CLASS_NAME, "initializeBackend",
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String.valueOf(configEntry), String.valueOf(baseDNs));
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// We won't support anything other than exactly one base DN in this
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// implementation. If we were to add such support in the future, we would
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// likely want to separate the data for each base DN into a separate entry
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// map.
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if ((baseDNs == null) || (baseDNs.length != 1))
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{
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int msgID = MSGID_MEMORYBACKEND_REQUIRE_EXACTLY_ONE_BASE;
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String message = getMessage(msgID);
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throw new ConfigException(msgID, message);
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}
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this.baseDNs = baseDNs;
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baseDNSet = new HashSet<DN>();
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for (DN dn : baseDNs)
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{
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baseDNSet.add(dn);
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}
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entryMap = new LinkedHashMap<DN,Entry>();
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childDNs = new HashMap<DN,HashSet<DN>>();
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supportedControls = new HashSet<String>();
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supportedControls.add(OID_SUBTREE_DELETE_CONTROL);
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supportedFeatures = new HashSet<String>();
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for (DN dn : baseDNs)
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{
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DirectoryServer.registerSuffix(dn, this);
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}
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}
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/**
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* Removes any data that may have been stored in this backend.
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*/
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public synchronized void clearMemoryBackend()
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{
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entryMap.clear();
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childDNs.clear();
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized void finalizeBackend()
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{
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assert debugEnter(CLASS_NAME, "finalizeBackend");
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clearMemoryBackend();
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}
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/**
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* {@inheritDoc}
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*/
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public DN[] getBaseDNs()
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{
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assert debugEnter(CLASS_NAME, "getBaseDNs");
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return baseDNs;
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isLocal()
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{
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assert debugEnter(CLASS_NAME, "isLocal");
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// For the purposes of this method, this is a local backend.
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized Entry getEntry(DN entryDN)
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{
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assert debugEnter(CLASS_NAME, "getEntry", String.valueOf(entryDN));
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return entryMap.get(entryDN);
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized boolean entryExists(DN entryDN)
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{
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assert debugEnter(CLASS_NAME, "entryExists", String.valueOf(entryDN));
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return entryMap.containsKey(entryDN);
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized void addEntry(Entry entry, AddOperation addOperation)
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throws DirectoryException
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{
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assert debugEnter(CLASS_NAME, "addEntry", String.valueOf(entry),
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String.valueOf(addOperation));
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// See if the target entry already exists. If so, then fail.
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DN entryDN = entry.getDN();
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if (entryMap.containsKey(entryDN))
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{
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int msgID = MSGID_MEMORYBACKEND_ENTRY_ALREADY_EXISTS;
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String message = getMessage(msgID, String.valueOf(entryDN));
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throw new DirectoryException(ResultCode.ENTRY_ALREADY_EXISTS, message,
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msgID);
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}
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// If the entry is one of the base DNs, then add it.
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if (baseDNSet.contains(entryDN))
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{
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entryMap.put(entryDN, entry);
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return;
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}
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// Get the parent DN and ensure that it exists in the backend.
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DN parentDN = entryDN.getParentDNInSuffix();
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if (parentDN == null)
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{
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int msgID = MSGID_MEMORYBACKEND_ENTRY_DOESNT_BELONG;
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String message = getMessage(msgID, String.valueOf(entryDN));
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throw new DirectoryException(ResultCode.NO_SUCH_OBJECT, message, msgID);
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}
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else if (! entryMap.containsKey(parentDN))
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{
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int msgID = MSGID_MEMORYBACKEND_PARENT_DOESNT_EXIST;
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String message = getMessage(msgID, String.valueOf(entryDN),
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String.valueOf(parentDN));
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throw new DirectoryException(ResultCode.NO_SUCH_OBJECT, message, msgID);
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}
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entryMap.put(entryDN, entry);
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HashSet<DN> children = childDNs.get(parentDN);
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if (children == null)
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{
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children = new HashSet<DN>();
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childDNs.put(parentDN, children);
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}
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children.add(entryDN);
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized void deleteEntry(DN entryDN,
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DeleteOperation deleteOperation)
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throws DirectoryException
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{
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assert debugEnter(CLASS_NAME, "deleteEntry", String.valueOf(entryDN),
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String.valueOf(deleteOperation));
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// Make sure the entry exists. If not, then throw an exception.
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if (! entryMap.containsKey(entryDN))
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{
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int msgID = MSGID_MEMORYBACKEND_ENTRY_DOESNT_EXIST;
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String message = getMessage(msgID, String.valueOf(entryDN));
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throw new DirectoryException(ResultCode.NO_SUCH_OBJECT, message, msgID);
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}
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// Check to see if the entry contains a subtree delete control.
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boolean subtreeDelete = false;
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if (deleteOperation != null)
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{
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for (Control c : deleteOperation.getRequestControls())
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{
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if (c.getOID().equals(OID_SUBTREE_DELETE_CONTROL))
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{
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subtreeDelete = true;
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}
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}
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}
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HashSet<DN> children = childDNs.get(entryDN);
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if (subtreeDelete)
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{
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if (children != null)
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{
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HashSet<DN> childrenCopy = new HashSet<DN>(children);
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for (DN childDN : childrenCopy)
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{
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try
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{
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deleteEntry(childDN, null);
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}
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catch (Exception e)
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{
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// This shouldn't happen, but we want the delete to continue anyway
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// so just ignore it if it does for some reason.
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assert debugException(CLASS_NAME, "deleteEntry", e);
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}
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}
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}
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}
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else
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{
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// Make sure the entry doesn't have any children. If it does, then throw
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// an exception.
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if ((children != null) && (! children.isEmpty()))
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{
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int msgID = MSGID_MEMORYBACKEND_CANNOT_DELETE_ENTRY_WITH_CHILDREN;
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String message = getMessage(msgID, String.valueOf(entryDN));
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throw new DirectoryException(ResultCode.NOT_ALLOWED_ON_NONLEAF, message,
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msgID);
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}
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}
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// Remove the entry from the backend. Also remove the reference to it from
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// its parent, if applicable.
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childDNs.remove(entryDN);
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entryMap.remove(entryDN);
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DN parentDN = entryDN.getParentDNInSuffix();
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if (parentDN != null)
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{
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HashSet<DN> parentsChildren = childDNs.get(parentDN);
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if (parentsChildren != null)
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{
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parentsChildren.remove(entryDN);
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if (parentsChildren.isEmpty())
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{
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childDNs.remove(parentDN);
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}
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}
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}
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized void replaceEntry(Entry entry,
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ModifyOperation modifyOperation)
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throws DirectoryException
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{
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assert debugEnter(CLASS_NAME, "replaceEntry", String.valueOf(entry),
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String.valueOf(modifyOperation));
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// Make sure the entry exists. If not, then throw an exception.
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DN entryDN = entry.getDN();
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if (! entryMap.containsKey(entryDN))
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{
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int msgID = MSGID_MEMORYBACKEND_ENTRY_DOESNT_EXIST;
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String message = getMessage(msgID, String.valueOf(entryDN));
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throw new DirectoryException(ResultCode.NO_SUCH_OBJECT, message, msgID);
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}
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// Replace the old entry with the new one.
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entryMap.put(entryDN, entry);
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized void renameEntry(DN currentDN, Entry entry,
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ModifyDNOperation modifyDNOperation)
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throws DirectoryException
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{
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assert debugEnter(CLASS_NAME, "renameEntry", String.valueOf(currentDN),
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String.valueOf(entry), String.valueOf(modifyDNOperation));
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// Make sure that the target entry exists.
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if (! entryMap.containsKey(currentDN))
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{
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int msgID = MSGID_MEMORYBACKEND_ENTRY_DOESNT_EXIST;
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String message = getMessage(msgID, String.valueOf(currentDN));
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throw new DirectoryException(ResultCode.NO_SUCH_OBJECT, message, msgID);
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}
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// Make sure that the target entry doesn't have any children.
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HashSet<DN> children = childDNs.get(currentDN);
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if (children != null)
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{
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if (children.isEmpty())
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{
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childDNs.remove(currentDN);
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}
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else
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{
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int msgID = MSGID_MEMORYBACKEND_CANNOT_RENAME_ENRY_WITH_CHILDREN;
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String message = getMessage(msgID, String.valueOf(currentDN));
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throw new DirectoryException(ResultCode.NOT_ALLOWED_ON_NONLEAF, message,
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msgID);
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}
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}
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// Make sure that no entry exists with the new DN.
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if (entryMap.containsKey(entry.getDN()))
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{
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int msgID = MSGID_MEMORYBACKEND_ENTRY_ALREADY_EXISTS;
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String message = getMessage(msgID, String.valueOf(entry.getDN()));
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throw new DirectoryException(ResultCode.NO_SUCH_OBJECT, message, msgID);
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}
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// Make sure that the new DN is in this backend.
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boolean matchFound = false;
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for (DN dn : baseDNs)
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{
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if (dn.isAncestorOf(entry.getDN()))
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{
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matchFound = true;
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break;
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}
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}
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if (! matchFound)
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{
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int msgID = MSGID_MEMORYBACKEND_CANNOT_RENAME_TO_ANOTHER_BACKEND;
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String message = getMessage(msgID, String.valueOf(currentDN));
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throw new DirectoryException(ResultCode.UNWILLING_TO_PERFORM, message,
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msgID);
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}
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// Make sure that the parent of the new entry exists.
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DN parentDN = entry.getDN().getParentDNInSuffix();
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if ((parentDN == null) || (! entryMap.containsKey(parentDN)))
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{
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int msgID = MSGID_MEMORYBACKEND_RENAME_PARENT_DOESNT_EXIST;
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String message = getMessage(msgID, String.valueOf(currentDN),
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String.valueOf(parentDN));
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throw new DirectoryException(ResultCode.UNWILLING_TO_PERFORM, message,
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msgID);
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}
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// Delete the current entry and add the new one.
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deleteEntry(currentDN, null);
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addEntry(entry, null);
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}
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/**
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* {@inheritDoc}
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*/
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public synchronized void search(SearchOperation searchOperation)
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throws DirectoryException
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{
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assert debugEnter(CLASS_NAME, "search", String.valueOf(searchOperation));
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|
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// Get the base DN, scope, and filter for the search.
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DN baseDN = searchOperation.getBaseDN();
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SearchScope scope = searchOperation.getScope();
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SearchFilter filter = searchOperation.getFilter();
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// If it's a base-level search, then just get that entry and return it if it
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// matches the filter.
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if (scope == SearchScope.BASE_OBJECT)
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{
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Entry entry = entryMap.get(baseDN);
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if (entry == null)
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{
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int msgID = MSGID_MEMORYBACKEND_ENTRY_DOESNT_EXIST;
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String message = getMessage(msgID, String.valueOf(baseDN));
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throw new DirectoryException(ResultCode.NO_SUCH_OBJECT, message, msgID);
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}
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if (filter.matchesEntry(entry))
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{
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searchOperation.returnEntry(entry, new LinkedList<Control>());
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}
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}
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else
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{
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// Walk through all entries and send the ones that match.
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for (Entry e : entryMap.values())
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{
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if (e.matchesBaseAndScope(baseDN, scope) && filter.matchesEntry(e))
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{
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searchOperation.returnEntry(e, new LinkedList<Control>());
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}
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}
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}
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}
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|
|
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/**
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* {@inheritDoc}
|
*/
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public HashSet<String> getSupportedControls()
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{
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assert debugEnter(CLASS_NAME, "getSupportedControls");
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return supportedControls;
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}
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|
|
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/**
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* {@inheritDoc}
|
*/
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public boolean supportsControl(String controlOID)
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{
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assert debugEnter(CLASS_NAME, "supportsControl",
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String.valueOf(controlOID));
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return supportedControls.contains(controlOID);
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}
|
|
|
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/**
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* {@inheritDoc}
|
*/
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public HashSet<String> getSupportedFeatures()
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{
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assert debugEnter(CLASS_NAME, "getSupportedFeatures");
|
|
return supportedFeatures;
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}
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|
|
|
/**
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* {@inheritDoc}
|
*/
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public boolean supportsFeature(String featureOID)
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{
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assert debugEnter(CLASS_NAME, "supportsFeature",
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String.valueOf(featureOID));
|
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// This backend does not provide any special feature support.
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return false;
|
}
|
|
|
|
/**
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* {@inheritDoc}
|
*/
|
public boolean supportsLDIFExport()
|
{
|
assert debugEnter(CLASS_NAME, "supportsLDIFExport");
|
|
return true;
|
}
|
|
|
|
/**
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* {@inheritDoc}
|
*/
|
public synchronized void exportLDIF(ConfigEntry configEntry, DN[] baseDNs,
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LDIFExportConfig exportConfig)
|
throws DirectoryException
|
{
|
assert debugEnter(CLASS_NAME, "exportLDIF", String.valueOf(exportConfig));
|
|
|
// Create the LDIF writer.
|
LDIFWriter ldifWriter;
|
try
|
{
|
ldifWriter = new LDIFWriter(exportConfig);
|
}
|
catch (Exception e)
|
{
|
assert debugException(CLASS_NAME, "exportLDIF", e);
|
|
int msgID = MSGID_MEMORYBACKEND_CANNOT_CREATE_LDIF_WRITER;
|
String message = getMessage(msgID, String.valueOf(e));
|
throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
|
message, msgID, e);
|
}
|
|
|
// Walk through all the entries and write them to LDIF.
|
DN entryDN = null;
|
try
|
{
|
for (Entry entry : entryMap.values())
|
{
|
entryDN = entry.getDN();
|
ldifWriter.writeEntry(entry);
|
}
|
}
|
catch (Exception e)
|
{
|
int msgID = MSGID_MEMORYBACKEND_CANNOT_WRITE_ENTRY_TO_LDIF;
|
String message = getMessage(msgID, String.valueOf(entryDN),
|
String.valueOf(e));
|
throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
|
message, msgID, e);
|
}
|
finally
|
{
|
try
|
{
|
ldifWriter.close();
|
}
|
catch (Exception e)
|
{
|
assert debugException(CLASS_NAME, "exportLDIF", e);
|
}
|
}
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public boolean supportsLDIFImport()
|
{
|
assert debugEnter(CLASS_NAME, "supportsLDIFImport");
|
|
return true;
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public synchronized void importLDIF(ConfigEntry configEntry, DN[] baseDNs,
|
LDIFImportConfig importConfig)
|
throws DirectoryException
|
{
|
assert debugEnter(CLASS_NAME, "importLDIF", String.valueOf(importConfig));
|
|
|
clearMemoryBackend();
|
|
LDIFReader reader;
|
try
|
{
|
reader = new LDIFReader(importConfig);
|
}
|
catch (Exception e)
|
{
|
int msgID = MSGID_MEMORYBACKEND_CANNOT_CREATE_LDIF_READER;
|
String message = getMessage(msgID, String.valueOf(e));
|
throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
|
message, msgID, e);
|
}
|
|
|
try
|
{
|
while (true)
|
{
|
Entry e = null;
|
try
|
{
|
e = reader.readEntry();
|
if (e == null)
|
{
|
break;
|
}
|
}
|
catch (LDIFException le)
|
{
|
if (! le.canContinueReading())
|
{
|
int msgID = MSGID_MEMORYBACKEND_ERROR_READING_LDIF;
|
String message = getMessage(msgID, String.valueOf(e));
|
throw new DirectoryException(
|
DirectoryServer.getServerErrorResultCode(),
|
message, msgID, le);
|
}
|
else
|
{
|
continue;
|
}
|
}
|
|
try
|
{
|
addEntry(e, null);
|
}
|
catch (DirectoryException de)
|
{
|
reader.rejectLastEntry(de.getErrorMessage());
|
}
|
}
|
}
|
catch (DirectoryException de)
|
{
|
throw de;
|
}
|
catch (Exception e)
|
{
|
int msgID = MSGID_MEMORYBACKEND_ERROR_DURING_IMPORT;
|
String message = getMessage(msgID, String.valueOf(e));
|
throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
|
message, msgID, e);
|
}
|
finally
|
{
|
reader.close();
|
}
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public boolean supportsBackup()
|
{
|
assert debugEnter(CLASS_NAME, "supportsBackup");
|
|
// This backend does not provide a backup/restore mechanism.
|
return false;
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public boolean supportsBackup(BackupConfig backupConfig,
|
StringBuilder unsupportedReason)
|
{
|
assert debugEnter(CLASS_NAME, "supportsBackup");
|
|
|
// This backend does not provide a backup/restore mechanism.
|
return false;
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public void createBackup(ConfigEntry configEntry, BackupConfig backupConfig)
|
throws DirectoryException
|
{
|
assert debugEnter(CLASS_NAME, "createBackup", String.valueOf(backupConfig));
|
|
|
int msgID = MSGID_MEMORYBACKEND_BACKUP_RESTORE_NOT_SUPPORTED;
|
String message = getMessage(msgID);
|
throw new DirectoryException(ResultCode.UNWILLING_TO_PERFORM, message,
|
msgID);
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public void removeBackup(BackupDirectory backupDirectory,
|
String backupID)
|
throws DirectoryException
|
{
|
assert debugEnter(CLASS_NAME, "removeBackup",
|
String.valueOf(backupDirectory),
|
String.valueOf(backupID));
|
|
|
int msgID = MSGID_MEMORYBACKEND_BACKUP_RESTORE_NOT_SUPPORTED;
|
String message = getMessage(msgID);
|
throw new DirectoryException(ResultCode.UNWILLING_TO_PERFORM, message,
|
msgID);
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public boolean supportsRestore()
|
{
|
assert debugEnter(CLASS_NAME, "supportsRestore");
|
|
|
// This backend does not provide a backup/restore mechanism.
|
return false;
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public void restoreBackup(ConfigEntry configEntry,
|
RestoreConfig restoreConfig)
|
throws DirectoryException
|
{
|
assert debugEnter(CLASS_NAME, "restoreBackup",
|
String.valueOf(restoreConfig));
|
|
|
int msgID = MSGID_MEMORYBACKEND_BACKUP_RESTORE_NOT_SUPPORTED;
|
String message = getMessage(msgID);
|
throw new DirectoryException(ResultCode.UNWILLING_TO_PERFORM, message,
|
msgID);
|
}
|
}
|
