org.maodian.flyingcat.xmpp.codec.InfoQueryCodec.java Source code

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Here is the source code for org.maodian.flyingcat.xmpp.codec.InfoQueryCodec.java

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/*
 * Copyright 2013 - 2013 Cole Wen
 *
 * Licensed 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.maodian.flyingcat.xmpp.codec;

import javax.xml.XMLConstants;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.maodian.flyingcat.xmpp.entity.InfoQuery;
import org.maodian.flyingcat.xmpp.entity.InfoQuery.Builder;
import org.maodian.flyingcat.xmpp.state.StanzaErrorCondition;
import org.maodian.flyingcat.xmpp.state.XmppException;
import org.springframework.stereotype.Component;

/**
 * @author Cole Wen
 *
 */
@Component
public class InfoQueryCodec extends AbstractCodec {

    /* (non-Javadoc)
     * @see org.maodian.flycat.xmpp.codec.Decoder#decode(java.lang.String)
     */
    @Override
    public Object decode(XMLStreamReader xmlsr) {
        try {
            String id = xmlsr.getAttributeValue("", "id");
            String type = xmlsr.getAttributeValue("", "type");
            Builder builder = new Builder(id, type);

            String from = xmlsr.getAttributeValue("", "from");
            String to = xmlsr.getAttributeValue("", "to");
            String language = xmlsr.getAttributeValue(XMLConstants.XML_NS_URI, "lang");
            builder.from(from).to(to).language(language);

            switch (type) {
            case InfoQuery.GET:
            case InfoQuery.SET:
                if (xmlsr.nextTag() != XMLStreamConstants.START_ELEMENT) {
                    throw new XmppException(StanzaErrorCondition.BAD_REQUEST);
                }
                QName key = xmlsr.getName();
                builder.payload(findDecoder(key, builder.build()).decode(xmlsr));
                break;
            case InfoQuery.RESULT:
                // do nothing
                break;
            case InfoQuery.ERROR:
                throw new IllegalStateException(
                        "Since this is a server, it should not dealing with incoming result and error");
            default:
                break;
            }
            return builder.build();
        } catch (XMLStreamException e) {
            throw new RuntimeException(e);
        }
    }

    /* (non-Javadoc)
     * @see org.maodian.flycat.xmpp.codec.Encoder#encode(java.lang.Object)
     */
    @Override
    public void encode(Object object, XMLStreamWriter xmlsw) throws XMLStreamException {
        InfoQuery iq = (InfoQuery) object;
        xmlsw.writeStartElement("iq");
        writeRequiredAttribute(xmlsw, "id", iq.getId());
        writeRequiredAttribute(xmlsw, "type", iq.getType());

        writeAttributeIfNotBlank(xmlsw, "from", iq.getFrom());
        writeAttributeIfNotBlank(xmlsw, "to", iq.getTo());
        writeAttributeIfNotBlank(xmlsw, XMLConstants.XML_NS_PREFIX, XMLConstants.XML_NS_URI, "lang",
                iq.getLanguage());

        Object payload = iq.getPayload();
        if (payload != null) {
            Encoder encoder = findEncoder(payload.getClass());
            encoder.encode(payload, xmlsw);
        }

        xmlsw.writeEndDocument();
    }

}