/*
 * Copyright (c) 2002-2010 Gargoyle Software Inc.
 *
 * 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 com.gargoylesoftware.htmlunit.javascript.host;

import com.gargoylesoftware.htmlunit.html.DomElement;
import com.gargoylesoftware.htmlunit.javascript.SimpleScriptable;
import com.gargoylesoftware.htmlunit.xml.XmlUtil;

/**
 * A JavaScript object for XPathNSResolver.
 *
 * @version $Revision: 5301 $
 * @author Ahmed Ashour
 */
public class XPathNSResolver extends SimpleScriptable {

    private static final long serialVersionUID = -6737970273175202932L;

    private Object element_;

    /**
     * Sets the element to start lookup from.
     * @param element {@link com.gargoylesoftware.htmlunit.javascript.host.html.HTMLElement}
     * or {@link Element} to start lookup from
     */
    public void setElement(final Node element) {
        element_ = element;
    }

    /**
     * Look up the namespace URI associated to the given namespace prefix.
     * @param prefix the prefix to look for
     * @return the associated namespace URI or null if none is found
     */
    public String jsxFunction_lookupNamespaceURI(final String prefix) {
        return XmlUtil.lookupNamespaceURI((DomElement) ((SimpleScriptable) element_).getDomNodeOrDie(), prefix);
    }

}
