/*
* 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.ldap.client.api;
import org.apache.directory.shared.i18n.I18n;
import org.apache.directory.shared.ldap.model.cursor.AbstractCursor;
import org.apache.directory.shared.ldap.model.cursor.EntryCursor;
import org.apache.directory.shared.ldap.model.cursor.InvalidCursorPositionException;
import org.apache.directory.shared.ldap.model.cursor.SearchCursor;
import org.apache.directory.shared.ldap.model.entry.Entry;
import org.apache.directory.shared.ldap.model.exception.LdapException;
import org.apache.directory.shared.ldap.model.message.Response;
import org.apache.directory.shared.ldap.model.message.SearchResultDone;
import org.apache.directory.shared.ldap.model.message.SearchResultEntry;
/**
* An implementation of Cursor based on the underlying SearchFuture instance.
*
* Note: This is a forward only cursor hence the only valid operations are next(), get() and close()
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class EntryCursorImpl extends AbstractCursor<Entry> implements EntryCursor
{
/** a reference to hold the retrieved SearchResponse object from SearchFuture */
private Response response;
/** The encapsulated search cursor */
private SearchCursor searchCursor;
/** The underlying messageId */
private int messageId;
/**
* Instantiates a new search cursor, embedding a SearchCursor.
*
* @param searchCursor the embedded SearchResponse cursor
*/
public EntryCursorImpl( SearchCursor searchCursor )
{
this.searchCursor = searchCursor;
messageId = -1;
}
/**
* {@inheritDoc}
*/
public boolean next() throws Exception
{
if ( !searchCursor.next() )
{
return false;
}
try
{
do
{
response = searchCursor.get();
if ( response == null )
{
throw new LdapException( LdapNetworkConnection.TIME_OUT_ERROR );
}
messageId = response.getMessageId();
if ( response instanceof SearchResultEntry )
{
return true;
}
}
while ( !( response instanceof SearchResultDone ) );
return false;
}
catch ( Exception e )
{
LdapException ldapException = new LdapException( LdapNetworkConnection.NO_RESPONSE_ERROR );
ldapException.initCause( e );
// close the cursor
close( ldapException );
throw ldapException;
}
}
/**
* {@inheritDoc}
*/
public Entry get() throws Exception
{
if ( !searchCursor.available() )
{
throw new InvalidCursorPositionException();
}
do
{
if ( response instanceof SearchResultEntry )
{
return ( ( SearchResultEntry ) response ).getEntry();
}
}
while ( next() && !( response instanceof SearchResultDone ) );
return null;
}
/**
* {@inheritDoc}
*/
public SearchResultDone getSearchResultDone()
{
return searchCursor.getSearchResultDone();
}
/**
* {@inheritDoc}
*/
public boolean available()
{
return searchCursor.available();
}
/**
* {@inheritDoc}
*/
@Override
public void close() throws Exception
{
searchCursor.close();
}
/**
* {@inheritDoc}
*/
@Override
public void close( Exception cause ) throws Exception
{
searchCursor.close( cause );
}
// rest of all operations will throw UnsupportedOperationException
/**
* This operation is not supported in SearchCursor.
* {@inheritDoc}
*/
public void after( Entry element ) throws Exception
{
throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName()
.concat( "." ).concat( "after( Response element )" ) ) );
}
/**
* This operation is not supported in SearchCursor.
* {@inheritDoc}
*/
public void afterLast() throws Exception
{
throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName()
.concat( "." ).concat( "afterLast()" ) ) );
}
/**
* This operation is not supported in SearchCursor.
* {@inheritDoc}
*/
public void before( Entry element ) throws Exception
{
throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName()
.concat( "." ).concat( "before( Response element )" ) ) );
}
/**
* This operation is not supported in SearchCursor.
* {@inheritDoc}
*/
public void beforeFirst() throws Exception
{
throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName()
.concat( "." ).concat( "beforeFirst()" ) ) );
}
/**
* This operation is not supported in SearchCursor.
* {@inheritDoc}
*/
public boolean first() throws Exception
{
throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName()
.concat( "." ).concat( "first()" ) ) );
}
/**
* This operation is not supported in SearchCursor.
* {@inheritDoc}
*/
public boolean last() throws Exception
{
throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName()
.concat( "." ).concat( "last()" ) ) );
}
/**
* This operation is not supported in SearchCursor.
* {@inheritDoc}
*/
public boolean previous() throws Exception
{
throw new UnsupportedOperationException( I18n.err( I18n.ERR_02014_UNSUPPORTED_OPERATION, getClass().getName()
.concat( "." ).concat( "previous()" ) ) );
}
/**
* {@inheritDoc}
*/
public int getMessageId()
{
return messageId;
}
}