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 * 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.james.imap.encode;

import java.io.IOException;
import java.util.List;

import org.apache.james.imap.api.ImapConstants;
import org.apache.james.imap.api.ImapMessage;
import org.apache.james.imap.api.process.ImapSession;
import org.apache.james.imap.encode.base.AbstractChainedImapEncoder;
import org.apache.james.imap.message.response.NamespaceResponse;
import org.apache.james.imap.message.response.NamespaceResponse.Namespace;

/**
 * Encodes namespace responses.
 */
public class NamespaceResponseEncoder extends AbstractChainedImapEncoder {

    public NamespaceResponseEncoder(ImapEncoder next) {
        super(next);
    }

    @Override
    protected void doEncode(ImapMessage acceptableMessage,
            ImapResponseComposer composer, ImapSession session)
            throws IOException {
        final NamespaceResponse response = (NamespaceResponse) acceptableMessage;
        composer.untagged();
        composer.commandName(ImapConstants.NAMESPACE_COMMAND_NAME);

        final List<NamespaceResponse.Namespace> personal = response
                .getPersonal();
        encode(personal, composer);
        final List<NamespaceResponse.Namespace> users = response.getUsers();
        encode(users, composer);
        final List<NamespaceResponse.Namespace> shared = response.getShared();
        encode(shared, composer);
        
        composer.end();
    }

    private void encode(List<Namespace> namespaces,
            ImapResponseComposer composer) throws IOException {
        if (namespaces == null || namespaces.isEmpty()) {
            composer.nil();
        } else {
            composer.openParen();
            for (NamespaceResponse.Namespace namespace : namespaces) {
                encode(namespace, composer);
            }
            composer.closeParen();
        }
    }

    private void encode(Namespace namespace, ImapResponseComposer composer)
            throws IOException {
        composer.openParen();
        String prefix = namespace.getPrefix();
        String delimiter = Character.toString(namespace.getDelimiter());
        
        if (prefix.length() > 0) {
            prefix = prefix + delimiter;
        }
        composer.quote(prefix);
        composer.quote(delimiter);
        composer.closeParen();
    }

    @Override
    protected boolean isAcceptable(ImapMessage message) {
        return message instanceof NamespaceResponse;
    }

}
