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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.batik.dom.util;

import org.apache.batik.constants.XMLConstants;

import org.w3c.dom.DOMException;
import org.w3c.dom.Element;

/**
 * This class provides support for XLink features.
 *
 * @author Stephane Hillion
 * @version $Id$
 */
public class XLinkSupport implements XMLConstants {

    /**
     * Returns the value of the 'xlink:type' attribute of the given element.
     */
    public static String getXLinkType(Element elt) {
        return elt.getAttributeNS(XLINK_NAMESPACE_URI, "type");
    }

    /**
     * Sets the value of the 'xlink:type' attribute of the given element.
     */
    public static void setXLinkType(Element elt, String str) {
        if (!"simple".equals(str)   &&
            !"extended".equals(str) &&
            !"locator".equals(str)  &&
            !"arc".equals(str)) {
            throw new DOMException(DOMException.SYNTAX_ERR,
                                   "xlink:type='" + str + "'");
        }
        elt.setAttributeNS(XLINK_NAMESPACE_URI, "type", str);
    }

    /**
     * Returns the value of the 'xlink:role' attribute of the given element.
     */
    public static String getXLinkRole(Element elt) {
        return elt.getAttributeNS(XLINK_NAMESPACE_URI, "role");
    }

    /**
     * Sets the value of the 'xlink:role' attribute of the given element.
     */
    public static void setXLinkRole(Element elt, String str) {
        elt.setAttributeNS(XLINK_NAMESPACE_URI, "role", str);
    }

    /**
     * Returns the value of the 'xlink:arcrole' attribute of the given element.
     */
    public static String getXLinkArcRole(Element elt) {
        return elt.getAttributeNS(XLINK_NAMESPACE_URI, "arcrole");
    }

    /**
     * Sets the value of the 'xlink:arcrole' attribute of the given element.
     */
    public static void setXLinkArcRole(Element elt, String str) {
        elt.setAttributeNS(XLINK_NAMESPACE_URI, "arcrole", str);
    }

    /**
     * Returns the value of the 'xlink:title' attribute of the given element.
     */
    public static String getXLinkTitle(Element elt) {
        return elt.getAttributeNS(XLINK_NAMESPACE_URI, "title");
    }

    /**
     * Sets the value of the 'xlink:title' attribute of the given element.
     */
    public static void setXLinkTitle(Element elt, String str) {
        elt.setAttributeNS(XLINK_NAMESPACE_URI, "title", str);
    }

    /**
     * Returns the value of the 'xlink:show' attribute of the given element.
     */
    public static String getXLinkShow(Element elt) {
        return elt.getAttributeNS(XLINK_NAMESPACE_URI, "show");
    }

    /**
     * Sets the value of the 'xlink:show' attribute of the given element.
     */
    public static void setXLinkShow(Element elt, String str) {
        if (!"new".equals(str)   &&
            !"replace".equals(str)  &&
            !"embed".equals(str)) {
            throw new DOMException(DOMException.SYNTAX_ERR,
                                   "xlink:show='" + str + "'");
        }
        elt.setAttributeNS(XLINK_NAMESPACE_URI, "show", str);
    }

    /**
     * Returns the value of the 'xlink:actuate' attribute of the given element.
     */
    public static String getXLinkActuate(Element elt) {
        return elt.getAttributeNS(XLINK_NAMESPACE_URI, "actuate");
    }

    /**
     * Sets the value of the 'xlink:actuate' attribute of the given element.
     */
    public static void setXLinkActuate(Element elt, String str) {
        if (!"onReplace".equals(str) && !"onLoad".equals(str)) {
            throw new DOMException(DOMException.SYNTAX_ERR,
                                   "xlink:actuate='" + str + "'");
        }
        elt.setAttributeNS(XLINK_NAMESPACE_URI, "actuate", str);
    }

    /**
     * Returns the value of the 'xlink:href' attribute of the given element.
     */
    public static String getXLinkHref(Element elt) {
        return elt.getAttributeNS(XLINK_NAMESPACE_URI, XLINK_HREF_ATTRIBUTE);
    }

    /**
     * Sets the value of the 'xlink:href' attribute of the given element.
     */
    public static void setXLinkHref(Element elt, String str) {
        elt.setAttributeNS(XLINK_NAMESPACE_URI, XLINK_HREF_ATTRIBUTE, str);
    }
}