/* ================================================================

 * Cewolf : Chart enabling Web Objects Framework

 * ================================================================

 *

 * Project Info:  http://cewolf.sourceforge.net

 * Project Lead:  Guido Laures (guido@laures.de);

 *

 * (C) Copyright 2002, by Guido Laures

 *

 * This library is free software; you can redistribute it and/or modify it under the terms

 * of the GNU Lesser General Public License as published by the Free Software Foundation;

 * either version 2.1 of

 * the License, or (at your option) any later version.

 *

 * This library 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 Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License along with this

 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,

 * Boston, MA 02111-1307, USA.

 */

package de.laures.cewolf.taglib.html;

import java.io.IOException;

import java.io.Serializable;

import java.io.Writer;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.JspWriter;

import de.laures.cewolf.taglib.tags.CewolfBodyTag;

/**

 * Abstract base class which holds attribbutes common for all HTML 4.0 tags.

 * @author  Guido Laures

 */

public abstract class AbstractHTMLBaseTag extends CewolfBodyTag implements Serializable{

    protected static final int UNDEFINED_INT = -1;

    protected static final float UNDEFINED_FLOAT = -1.0f;

    protected static final String UNDEFINED_STR = null;

    /** Holds value of property ID. */

    protected String id = UNDEFINED_STR;

    /** Holds value of property clazz. */

    protected String clazz = UNDEFINED_STR;

    /** Holds value of property style. */

    protected String style = UNDEFINED_STR;

    /** Holds value of property title. */

    protected String title = UNDEFINED_STR;

    /** Holds value of property lang. */

    protected String lang = UNDEFINED_STR;

    /** Holds value of property dir. */

    protected String dir = UNDEFINED_STR;

    /** Holds value of property onclick. */

    protected String onclick = UNDEFINED_STR;

    /** Holds value of property ondbclick. */

    protected String ondbclick = UNDEFINED_STR;

    /** Holds value of property onmousedown. */

    protected String onmousedown = UNDEFINED_STR;

    /** Holds value of property onmouseup. */

    protected String onmouseup = UNDEFINED_STR;

    /** Holds value of property onmouseover. */

    protected String onmouseover = UNDEFINED_STR;

    /** Holds value of property onmousemove. */

    protected String onmousemove = UNDEFINED_STR;

    /** Holds value of property onmouseout. */

    protected String onmouseout = UNDEFINED_STR;

    /** Holds value of property onkeypress. */

    protected String onkeypress = UNDEFINED_STR;

    /** Holds value of property onkeydown. */

    protected String onkeydown = UNDEFINED_STR;

    /** Holds value of property onkeyup. */

    protected String onkeyup = UNDEFINED_STR;

    public AbstractHTMLBaseTag(){

    	setId(UNDEFINED_STR);

    }

    protected abstract String getTagName();

    protected abstract boolean hasBody();

    protected abstract boolean wellFormed();

    protected void reset(){

        this.clazz = UNDEFINED_STR;

        this.dir = UNDEFINED_STR;

        this.id = UNDEFINED_STR;

        this.lang = UNDEFINED_STR;

        this.onclick = UNDEFINED_STR;

        this.ondbclick = UNDEFINED_STR;

        this.onkeydown = UNDEFINED_STR;

        this.onkeypress = UNDEFINED_STR;

        this.onkeyup = UNDEFINED_STR;

        this.onmousedown = UNDEFINED_STR;

        this.onmousemove = UNDEFINED_STR;

        this.onmouseout = UNDEFINED_STR;

        this.onmouseover = UNDEFINED_STR;

        this.onmouseup = UNDEFINED_STR;

        this.style = UNDEFINED_STR;

        this.title = UNDEFINED_STR;

    }

    public int doStartTag() throws JspException {

        JspWriter writer = pageContext.getOut();

        try {

            writer.write("<" + getTagName());

            writeAttributes(writer);

            if(hasBody()){

                writer.write(">");

                return EVAL_PAGE;

            } else {

                return SKIP_BODY;

            }

        } catch(IOException ioe){

        	super.pageContext.getServletContext().log("",ioe);

            throw new JspException(ioe.getMessage());

        }

    }

    public int doEndTag() throws JspException {

        JspWriter writer = pageContext.getOut();

        try{

            if(hasBody()){

                writer.write("</" + getTagName() + ">");

            } else {

                if(wellFormed()){

                    writer.write(" /");

                }

                writer.write(">");

            }

            return doAfterEndTag(EVAL_PAGE);

        } catch(IOException ioe){

        	super.pageContext.getServletContext().log("",ioe);

            throw new JspException(ioe.getMessage());

        }

    }

    public void writeAttributes(Writer wr){

        try {

            appendAttributeDeclaration(wr, getId(), "ID");

            appendAttributeDeclaration(wr, this.clazz, "CLASS");

            appendAttributeDeclaration(wr, this.style, "STYLE");

            appendAttributeDeclaration(wr, this.onclick, "ONCLICK");

            appendAttributeDeclaration(wr, this.ondbclick, "ONDBCLICK");

            appendAttributeDeclaration(wr, this.onkeydown, "ONKEYDOWN");

            appendAttributeDeclaration(wr, this.onkeypress, "ONKEYPRESS");

            appendAttributeDeclaration(wr, this.onkeyup, "ONKEYUP");

            appendAttributeDeclaration(wr, this.onmousedown, "ONMOUSEDOWN");

            appendAttributeDeclaration(wr, this.onmousemove, "ONMOUSEMOVE");

            appendAttributeDeclaration(wr, this.onmouseout, "ONMOUSEOUT");

            appendAttributeDeclaration(wr, this.onmouseover, "ONMOUSEOVER");

            appendAttributeDeclaration(wr, this.onmouseup, "ONMOUSEUP");

            appendAttributeDeclaration(wr, this.title, "TITLE");

            appendAttributeDeclaration(wr, this.lang, "LANG");

            appendAttributeDeclaration(wr, this.dir, "DIR");

        } catch(IOException ioex){

            ioex.printStackTrace();

        }

    }

    protected void appendAttributeDeclaration(Writer wr, String attr, String name) throws IOException {

        if(attr != UNDEFINED_STR){

            wr.write(" " + name + "=\"" + attr + "\"");

        }

    }

    protected void appendAttributeDeclaration(Writer wr, int attr, String name) throws IOException {

        // does not call the according method for Strings to avoid additional

        // String instantiation

        if(attr != UNDEFINED_INT){

            wr.write(" " + name + "=\"" + attr + "\"");

        }

    }

    protected void appendAttributeDeclaration(Writer wr, float attr, String name) throws IOException {

        // does not call the according method for Strings to avoid additional

        // String instantiation

        if(attr != UNDEFINED_FLOAT){

            wr.write(" " + name + "=\"" + attr + "\"");

        }

    }

    /** Setter for property clazz.

     * @param clazz New value of property clazz.

     */

    public void setClass(String clazz) {

        this.clazz = clazz;

    }

    /** Setter for property style.

     * @param style New value of property style.

     */

    public void setStyle(String style) {

        this.style = style;

    }

    /** Setter for property title.

     * @param title New value of property title.

     */

    public void setHtmltitle(String title) {

        this.title = title;

    }

    /** Setter for property lang.

     * @param lang New value of property lang.

     */

    public void setLang(String lang) {

        this.lang = lang;

    }

    /** Setter for property dir.

     * @param dir New value of property dir.

     */

    public void setDir(String dir) {

        this.dir = dir;

    }

    /** Setter for property onclick.

     * @param onclick New value of property onclick.

     */

    public void setOnclick(String onclick) {

        this.onclick = onclick;

    }

    /** Setter for property ondbclick.

     * @param ondbclick New value of property ondbclick.

     */

    public void setOndbclick(String ondbclick) {

        this.ondbclick = ondbclick;

    }

    /** Setter for property onmousedown.

     * @param onmousedown New value of property onmousedown.

     */

    public void setOnmousedown(String onmousedown) {

        this.onmousedown = onmousedown;

    }

    /** Setter for property onmouseup.

     * @param onmouseup New value of property onmouseup.

     */

    public void setOnmouseup(String onmouseup) {

        this.onmouseup = onmouseup;

    }

    /** Setter for property onmouseover.

     * @param onmouseover New value of property onmouseover.

     */

    public void setOnmouseover(String onmouseover) {

        this.onmouseover = onmouseover;

    }

    /** Setter for property onmousemove.

     * @param onmousemove New value of property onmousemove.

     */

    public void setOnmousemove(String onmousemove) {

        this.onmousemove = onmousemove;

    }

    /** Setter for property onmouseout.

     * @param onmouseout New value of property onmouseout.

     */

    public void setOnmouseout(String onmouseout) {

        this.onmouseout = onmouseout;

    }

    /** Setter for property onkeypress.

     * @param onkeypress New value of property onkeypress.

     */

    public void setOnkeypress(String onkeypress) {

        this.onkeypress = onkeypress;

    }

    /** Setter for property onkeydown.

     * @param onkeydown New value of property onkeydown.

     */

    public void setOnkeydown(String onkeydown) {

        this.onkeydown = onkeydown;

    }

    /** Setter for property onkeyup.

     * @param onkeyup New value of property onkeyup.

     */

    public void setOnkeyup(String onkeyup) {

        this.onkeyup = onkeyup;

    }

}