/**
 * Copyright (C) 2012-2017 52°North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of
 * the following licenses, the combination of the program with the linked
 * library is not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed
 * under the aforementioned licenses, is permitted by the copyright holders
 * if the distribution is compliant with both the GNU General Public
 * License version 2 and the aforementioned licenses.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 */
package org.n52.sos.encode;

import java.util.Collections;
import java.util.Map;
import java.util.Set;

import org.apache.xmlbeans.XmlObject;
import org.n52.sos.exception.ows.concrete.UnsupportedEncoderInputException;
import org.n52.sos.ogc.ows.OwsExceptionReport;
import org.n52.sos.ogc.sos.SosConstants.HelperValues;
import org.n52.sos.util.CodingHelper;
import org.n52.sos.util.XmlOptionsHelper;
import org.n52.sos.w3c.W3CConstants;
import org.n52.sos.w3c.xlink.W3CHrefAttribute;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3.x1999.xlink.HrefAttribute;

import com.google.common.base.Joiner;

public class XlinkEncoderv1999 extends AbstractXmlEncoder<Object> {
    private static final Logger LOGGER = LoggerFactory.getLogger(XlinkEncoderv1999.class);
    
    private static final Set<EncoderKey> ENCODER_KEYS = CodingHelper.encoderKeysForElements(W3CConstants.NS_XLINK,
            W3CHrefAttribute.class);

    public XlinkEncoderv1999() {
        LOGGER.debug("Encoder for the following keys initialized successfully: {}!", Joiner.on(", ")
                .join(ENCODER_KEYS));
    }

    @Override
    public Set<EncoderKey> getEncoderKeyType() {
        return Collections.unmodifiableSet(ENCODER_KEYS);
    }

    @Override
    public XmlObject encode(Object element, Map<HelperValues, String> additionalValues)
            throws OwsExceptionReport, UnsupportedEncoderInputException {
        XmlObject encodedObject = null;
        if (element instanceof W3CHrefAttribute) {
            encodedObject = encodeHrefAttribute((W3CHrefAttribute) element);
        } else {
            throw new UnsupportedEncoderInputException(this, element);
        }
        return encodedObject;
    }

    private XmlObject encodeHrefAttribute(W3CHrefAttribute hrefAttribute) {
        HrefAttribute xmlHrefAttribute = HrefAttribute.Factory.newInstance(XmlOptionsHelper.getInstance().getXmlOptions());
        xmlHrefAttribute.setHref(hrefAttribute.getHref());
        return xmlHrefAttribute;
    }

}