/*
 * Copyright 2002,2004 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.commons.jelly.tags.xml;

import org.apache.commons.jelly.JellyTagException;
import org.apache.commons.jelly.MissingAttributeException;
import org.apache.commons.jelly.XMLOutput;
import org.apache.commons.jelly.xpath.XPathTagSupport;

import org.xml.sax.SAXException;

/**
 * A tag which outputs a DOCTYPE declaration to the current XML output pipe.
 * Note that there should only be a single DOCTYPE declaration in any XML stream and
 * it should occur before any element content.
 *
 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
 * @version $Revision: 1.5 $
 */
public class DoctypeTag extends XPathTagSupport {

    private String name;
    private String publicId;
    private String systemId;

    public DoctypeTag() {
    }

    // Tag interface
    //-------------------------------------------------------------------------
    public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException {
        if (name == null) {
            throw new MissingAttributeException( "name" );
        }

        try {
            output.startDTD(name, publicId, systemId);
            invokeBody(output);
            output.endDTD();
        } catch (SAXException e) {
            throw new JellyTagException(e);
        }
    }

    // Properties
    //-------------------------------------------------------------------------
    /**
     * Returns the name.
     * @return String
     */
    public String getName() {
        return name;
    }

    /**
     * Returns the publicId.
     * @return String
     */
    public String getPublicId() {
        return publicId;
    }

    /**
     * Returns the systemId.
     * @return String
     */
    public String getSystemId() {
        return systemId;
    }

    /**
     * Sets the document type name of the DOCTYPE
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * Sets the declared public identifier for DTD
     */
    public void setPublicId(String publicId) {
        this.publicId = publicId;
    }

    /**
     * Sets the declared system identifier for the DTD
     */
    public void setSystemId(String systemId) {
        this.systemId = systemId;
    }

}