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* Licensed to the Apache Software Foundation (ASF) under one *
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* 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. *
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package org.apache.james.protocols.pop3.core;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.apache.james.protocols.api.ProtocolSession.State;
import org.apache.james.protocols.api.Request;
import org.apache.james.protocols.api.Response;
import org.apache.james.protocols.api.handler.CommandHandler;
import org.apache.james.protocols.pop3.POP3Response;
import org.apache.james.protocols.pop3.POP3Session;
import org.apache.james.protocols.pop3.POP3StreamResponse;
import org.apache.james.protocols.pop3.mailbox.MessageMetaData;
/**
* Handles RETR command
*/
public class RetrCmdHandler implements CommandHandler<POP3Session> {
private static final Collection<String> COMMANDS = Collections.unmodifiableCollection(Arrays.asList("RETR"));
private static final Response SYNTAX_ERROR = new POP3Response(POP3Response.ERR_RESPONSE, "Usage: RETR [mail number]").immutable();
private static final Response ERROR_MESSAGE_RETRIEVE = new POP3Response(POP3Response.ERR_RESPONSE, "Error while retrieving message.").immutable();
/**
* Handler method called upon receipt of a RETR command. This command
* retrieves a particular mail message from the mailbox.
*/
@SuppressWarnings("unchecked")
public Response onCommand(POP3Session session, Request request) {
POP3Response response = null;
String parameters = request.getArgument();
if (session.getHandlerState() == POP3Session.TRANSACTION) {
int num = 0;
try {
num = Integer.parseInt(parameters.trim());
} catch (Exception e) {
return SYNTAX_ERROR;
}
try {
MessageMetaData data = MessageMetaDataUtils.getMetaData(session, num);
if (data == null) {
StringBuilder responseBuffer = new StringBuilder(64).append("Message (").append(num).append(") does not exist.");
response = new POP3Response(POP3Response.ERR_RESPONSE, responseBuffer.toString());
return response;
}
List<Long> deletedUidList = (List<Long>) session.getAttachment(POP3Session.DELETED_UID_LIST, State.Transaction);
Long uid = data.getUid();
if (deletedUidList.contains(uid) == false) {
InputStream content = session.getUserMailbox().getMessage(uid);
if (content != null) {
InputStream in = new CRLFTerminatedInputStream(new ExtraDotInputStream(content));
response = new POP3StreamResponse(POP3Response.OK_RESPONSE, "Message follows", in);
return response;
} else {
StringBuilder responseBuffer = new StringBuilder(64).append("Message (").append(num).append(") does not exist.");
response = new POP3Response(POP3Response.ERR_RESPONSE, responseBuffer.toString());
}
} else {
StringBuilder responseBuffer = new StringBuilder(64).append("Message (").append(num).append(") already deleted.");
response = new POP3Response(POP3Response.ERR_RESPONSE, responseBuffer.toString());
}
} catch (IOException ioe) {
return ERROR_MESSAGE_RETRIEVE;
}
} else {
return POP3Response.ERR;
}
return response;
}
/**
* @see org.apache.james.protocols.api.handler.CommandHandler#getImplCommands()
*/
public Collection<String> getImplCommands() {
return COMMANDS;
}
}