calendartag.java

一个实用工具类

/*
 * Copyright (C) butor.com. All rights reserved.
 *
 * This software is published under the terms of the GNU Library General
 * Public License (GNU LGPL), a copy of which has been included with this
 * distribution in the LICENSE.txt file. 
 */


package org.butor.web.taglib.html;

import java.io.IOException;
import java.util.Locale;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import org.apache.struts.taglib.html.Constants;
import org.apache.struts.util.RequestUtils;
import org.apache.struts.util.ResponseUtils;
import org.butor.web.action.IButorActionForm;
import org.butor.web.context.IWebContext;
import org.butor.web.context.WebContextService;


/**
 * Puts the calendar link along with its icon.
 * 
 * @author 	mateusfi
 */
public class CalendarTag extends TagSupport {
	/**
	 * Name of the form-bean containing the property attribute.
	 */
	protected String f_name;
	
	/**
	 * Property of the form-bean on which the date must be copied.
	 */
	protected String f_property;
	
	/**
	 * Property of the form-bean representing the start date as relative to property attribute.
	 */
	protected String f_startDateProperty;
	
	/**
	 * Format of the input date.
	 */
	protected String f_format;
	
	/**
	 * Image file name of the icon to display.
	 */
	protected String f_image;
	
	/**
	 * @see javax.servlet.jsp.tagext.Tag#release()
	 */
	public void release() {
		super.release();
		
		f_name = Constants.BEAN_KEY;
	}

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

	/**
	 * Sets the name.
	 * @param name The name to set
	 */
	public void setName(String name) {
		f_name = name;
	}

	/**
	 * Returns the format.
	 * @return String
	 */
	public String getFormat() {
		return f_format;
	}

	/**
	 * Returns the property.
	 * @return String
	 */
	public String getProperty() {
		return f_property;
	}

	/**
	 * Sets the format.
	 * @param format The format to set
	 */
	public void setFormat(String format) {
		f_format = format;
	}

	/**
	 * Sets the property.
	 * @param property The property to set
	 */
	public void setProperty(String property) {
		f_property = property;
	}

	/**
	 * @see javax.servlet.jsp.tagext.Tag#doStartTag()
	 */
	public int doStartTag() throws JspException {
    	// Find and check the form bean
    	Object o = RequestUtils.lookup(pageContext, getName(), null);    	
        if (! (o instanceof IButorActionForm)) {
			ResponseUtils.write(pageContext, "The form bean must be an instance of ButorActionForm !!!");
			return SKIP_BODY;
        }        
        IButorActionForm form = (IButorActionForm) o;
        		
		if (getImage() == null) {
			setImage("/_images/calendar.gif");
		}
		
		if (form.getEnabled(getProperty())) {
			try {
				JspWriter writer = pageContext.getOut();
				writer.print("<a href=\"javascript:startCalendar(");
				writer.print("'" + getName() + "', ");
				writer.print("'" + getProperty() + "', ");
				writer.print("'" + getStartDateProperty() + "', ");
				
				IWebContext context = WebContextService.getContext();
				Locale locale = context.getLocale();
				
				// Temporary!
				// Language conversion - calendar.js should be fixed to use ISO language codes !
				String language = "";
				if (locale.getLanguage().equals(Locale.FRENCH.getLanguage())) {
					language = "FRA";
				} else if (locale.getLanguage().equals(Locale.ENGLISH.getLanguage())) {
					language = "ENG";
				}
				writer.print("'" + language + "', ");
				writer.print("'" + getFormat() + "')\">");
				
				writer.print("<img src=\"" + getImage() + "\"border=\"0\">");
				writer.print("</a>");
				
				writer.println();
			} catch (IOException e) {
				throw new JspException(e);
			}
		}
				
		return SKIP_BODY;
	}
	
/*	protected String findFormName() {
				
	}*/

	/**
	 * Returns the startDateProperty.
	 * @return String
	 */
	public String getStartDateProperty() {
		return f_startDateProperty;
	}

	/**
	 * Sets the startDateProperty.
	 * @param startDateProperty The startDateProperty to set
	 */
	public void setStartDateProperty(String startDateProperty) {
		f_startDateProperty = startDateProperty;
	}

	/**
	 * Returns the image.
	 * @return String
	 */
	public String getImage() {
		return f_image;
	}

	/**
	 * Sets the image.
	 * @param image The image to set
	 */
	public void setImage(String image) {
		f_image = image;
	}

}