Functions.java

/*
 * Copyright 1999-2004 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.taglibs.standard.examples.taglib;

import java.lang.reflect.Array;

import javax.servlet.jsp.JspTagException;

/**
 * <p>Exmaples taglib Functions</p>
 * 
 * @author Pierre Delisle
 */

public class Functions {

    /**
     * Display the collection types supported by c:forEach.
     */
    public static String display(Object obj) throws JspTagException {
        if (obj == null) return "";         
        if (obj instanceof String) return obj.toString();
        /*
        if (obj instanceof Collection) {
            return "FIXME";
        }
        if (obj instanceof Map) {
            return "FIXME";
        }        
        if (obj instanceof Iterator) {
            Iterator iter = (Iterator)obj;
            while (iter.hasNext()) {
                iter.next();
            }
            return "FIXME";
        }            
        if (obj instanceof Enumeration) {
            Enumeration enum_ = (Enumeration)obj;
            while (enum_.hasMoreElements()) {
                enum_.nextElement();
            }
            return "FIXME";
        }
        */
        try {
            StringBuffer buf = new StringBuffer();
            int count = Array.getLength(obj);
            for (int i=0; i<count; i++) {
                buf.append(Array.get(obj, i).toString());
                if (i<count-1) buf.append("<font color='red'> • </font>");
            }
            return buf.toString();
        } catch (IllegalArgumentException ex) {}
        throw new JspTagException("Bad Item");        
    }      
}