/*
 * Copyright 2003,2004 The Apache Software Foundation.
 * 
 * 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.apache.pluto.tags;

import javax.portlet.RenderResponse;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
import java.io.IOException;

/**
 * This tag produces a unique value for the current portlet.
 * <p/>
 * <p/>
 * Supporting class for the <CODE>namespace</CODE> tag. writes a unique value
 * for the current portlet <BR>This tag has no attributes
 */
public class NamespaceTag extends TagSupport {

    /* (non-Javadoc)
     * @see javax.servlet.jsp.tagext.Tag#doStartTag()
     */
    public int doStartTag() throws JspException {
        RenderResponse renderResponse = (RenderResponse) pageContext.getRequest()
            .getAttribute("javax.portlet.response");
        String namespace = renderResponse.getNamespace();
        JspWriter writer = pageContext.getOut();
        try {
            writer.print(namespace);
        } catch (IOException ioe) {
            throw new JspException(
                "Unable to write namespace", ioe
            );
        }
        return SKIP_BODY;
    }
}