stringarrayconverter.java

一个使用struts+hibernate+spring开发的完的网站源代码。

/*
 * Copyright 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.myfaces.convert;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.StringTokenizer;

/**
 * @author Thomas Spiegl (latest modification by $Author: matze $)
 * @version $Revision: 1.3 $ $Date: 2004/10/13 11:50:57 $
 */
public class StringArrayConverter
    implements Converter
{
    public Object getAsObject(FacesContext context, UIComponent component, String value)
        throws ConverterException
    {
        try
        {
            StringTokenizer tokenizer = new StringTokenizer(value, ",");
            String[] newValue = new String[tokenizer.countTokens()];
            for (int i = 0; tokenizer.hasMoreTokens(); i++)
            {
                newValue[i] = URLDecoder.decode(tokenizer.nextToken(), "UTF-8");
            }
            return newValue;
        }
        catch (UnsupportedEncodingException e)
        {
            throw new RuntimeException(e);
        }
    }

    public String getAsString(FacesContext context, UIComponent component, Object value)
            throws ConverterException
    {
        return getAsString((String[])value,
                           true);   //escapeCommas
    }


    public static String getAsString(String[] strings,
                                     boolean escapeCommas)
    {
        try
        {
            if (strings == null || strings.length == 0)
            {
                return null;
            }
            else if (strings.length == 1)
            {

                return escapeCommas
                        ? URLEncoder.encode(strings[0], "UTF-8") //Encode, so that commas within Strings are escaped
                        : strings[0];
            }
            else
            {
                StringBuffer buf = new StringBuffer();
                for (int i = 0; i < strings.length; i++)
                {
                    if (i > 0)
                    {
                        buf.append(',');
                    }
                    String s = strings[i];
                    if (escapeCommas)
                    {
                        //Encode, so that commas within Strings are escaped
                        s = URLEncoder.encode(s, "UTF-8");
                    }
                    buf.append(s);
                }
                return buf.toString();
            }
        }
        catch (UnsupportedEncodingException e)
        {
            throw new RuntimeException(e);
        }
    }

}