taglibhelper.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.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Date;
import java.util.StringTokenizer;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;

import org.apache.struts.util.ResponseUtils;
import org.butor.helper.DateManip;
import org.butor.log.Log;

/**
 * @author nacroaz
 *
 * To change this generated comment edit the template variable "typecomment":
 * Window>Preferences>Java>Templates.
 */
public class TagLibHelper {
	public static final String DATA_TYPE_NUMBER = "number";
	public static final String DATA_TYPE_DATE = "date";
	
	public static void renderText(PageContext pageContext, String text, boolean style) throws JspException {   	    
   	    renderText(pageContext, text, style, false);			
	}
	
	public static void renderText(PageContext pageContext, String text, boolean style, boolean isMultiLines) throws JspException  {
		StringBuffer results = new StringBuffer();

		// Style		
		if (style) {
			results.append("<span class=\"static\">");
		}

		if (isMultiLines) {
	   		StringTokenizer st = new StringTokenizer(text, "\n", true);
	   		String token = null;
	   		while(st.hasMoreTokens()) {
	   			token = st.nextToken();
	   			if (token != null && token.equals("\n")) {
	   				results.append("<BR>");
	   			} else {
	   				results.append(token);
	   			}
	   		}
		} else {
			// Add text
        	results.append(text);
		}
		
		// Style        
        if (style) {
			results.append("</span>");		
        }
		
        // Print this field to our output writer
   	    ResponseUtils.write(pageContext, results.toString());			
	}

	public static void renderHiddenField(PageContext pageContext, String property, String value) throws JspException {		
		renderText(pageContext, "<input type=\"hidden\" name=\"" + property + "\" value=\"" + value + "\" >", false);	        				
	}
	

	public static void renderStaticField(PageContext pageContext, String property, String value) throws JspException {		
		renderStaticField(pageContext, property, value, false);      
	}
	
	public static void renderStaticField(PageContext pageContext, String property, String value, String formatedValue) throws JspException {		
		renderStaticField(pageContext, property, value, formatedValue, false);      
	}
	
	public static void renderStaticField(PageContext pageContext, String property, String value, boolean isMultiLines) throws JspException {
		renderStaticField(pageContext, property, value, null, isMultiLines);
	}

	public static void renderStaticField(PageContext pageContext, String property, String value, String formatedValue, boolean isMultiLines) throws JspException {
		// Add value    
		if (formatedValue != null) {
			renderText(pageContext, ResponseUtils.filter(formatedValue), true, isMultiLines);
			
		} else {
			renderText(pageContext, ResponseUtils.filter(value), true, isMultiLines);
		}
	        
		// Add an hidden field for this property	            
		renderHiddenField(pageContext, property, value);	        
	}
	
	public static void renderStaticChecked(PageContext pageContext, String property, String value) throws JspException {
		//  Add the checked image
	    TagLibHelper.renderText(pageContext, "<img src=\"/_images/checked.gif\">", false);
	            
	    // Add an hidden field for this property
	    TagLibHelper.renderHiddenField(pageContext, property, value);	
	}	
	
	/**
	 * Formats value to postal code format
	 * ex: H3B4S9 -> H3B 4S9
	 * 
	 * @param value
	 * @return
	 */
	public static String formatPostalCode(String value) {
		if (value == null) {
			return null;
		}

		value = value.trim();		
		if (value.length() != 6) {
			return value;
		}
		
		return value.substring(0, 3) + " " + value.substring(3, 6);
	}
	
	/**
	 * Transforms a value into a phone number formatted like "[phone]"
	 * Parsing is done by extracting digits from the original value
	 * and throwing away everything else.
	 * 
	 * @param value
	 * @return
	 */
	public static String formatPhoneNumber(String value) {
		if (value == null) {
			return null;
		}

		// Do nothing if phone number is incomplete
		if (value.length() < 7) {
			return value;
		}
		
		StringBuffer digits = new StringBuffer();
		for (int i = 0; i < value.length(); i++) {
			char ch = value.charAt(i);
			if (Character.isDigit(ch)) {
				digits.append(ch);
			}
		}
		
		switch (digits.length()) {
			// Phone number only
			case 7: return digits.substring(0, 3) + "-" + digits.substring(3, 7);
				
			// Area code + phone number
			case 10: return "(" + digits.substring(0, 3) + ") " + digits.substring(3, 6) + "-" + digits.substring(6, 10);
		}
		
		return value;
	}

	public static String format(Object value, String dataType, String formatPattern) {
		if (value == null) {
			Log.logStr(Log.LOG_LEVEL_MEDIUM, TagLibHelper.class, Log.LOG_TYPE_WARN, "format()", "Got NULL value!");
			return null;
		}
		
		if (dataType == null) {
			Log.logStr(Log.LOG_LEVEL_MEDIUM, TagLibHelper.class, Log.LOG_TYPE_WARN, "format()", "Got NULL data type!");
			return value.toString();
		}
		
		if (formatPattern == null) {
			Log.logStr(Log.LOG_LEVEL_MEDIUM, TagLibHelper.class, Log.LOG_TYPE_WARN, "format()", "Got NULL format pattern!");
			return value.toString();
		}
		
		if (dataType.equalsIgnoreCase(DATA_TYPE_NUMBER)) {
			NumberFormat nbrFormat = NumberFormat.getNumberInstance();
			((DecimalFormat)nbrFormat).applyPattern(formatPattern);
			
			Number nbr = null;
			if (value instanceof Number) {
				nbr = (Number) value;
				
			} else if (value instanceof String) {
				
				if (((String)value).trim().length() > 0) {
					try {
						nbr = new Double((String) value);
						
					} catch (NumberFormatException e) {
						Log.logStr(TagLibHelper.class, Log.LOG_TYPE_WARN, "format()", "Can't parse value as double! Got value=[" +value +"]." );
						return null;
					}
				}
			}
			
			if (nbr != null) {
				return nbrFormat.format(nbr);
			}
				
		} else if (dataType.equalsIgnoreCase(DATA_TYPE_DATE)) {
			
			Date date = null;
			if (value instanceof Date) {
				date = (Date) value;
				
			} else if (value instanceof String) {
				try {
					date = DateManip.parseDate((String) value);
				} catch (ParseException e) {
					Log.logStr(TagLibHelper.class, Log.LOG_TYPE_WARN, "format()", "Can't parse value as date! Got value=[" +value +"].");
					return null;
				}
			}
			
			if (date != null && !date.equals(DateManip.NULL_MIN_DATE) &&
					!date.equals(DateManip.NULL_MAX_DATE)) {
						
				return DateManip.formatDate(formatPattern, date);
			} else {
				return "";
			}
			
		} else if (dataType.equalsIgnoreCase(DATA_TYPE_DATE)) {
			Log.logStr(TagLibHelper.class, Log.LOG_TYPE_WARN, "format()", "Invalid data type! Got dataType=[" +dataType +"]");
		}
		
		return value.toString();
	}
}