/*

  * Copyright 2007-2008 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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.kuali.rice.core.web.format;

 import java.util.Collection;

 import java.util.Iterator;

 /**

  * Formats a collection into a string that looks like an array.  To print out each element,

  * the toString method of each element is called. 

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  *

  */

 public class CollectionFormatter extends Formatter {

     private static final long serialVersionUID = 1074862354812893254L;

         /**

      * Formats a collection into a string that looks like an array.

      * 

      * @see org.kuali.rice.core.web.format.Formatter#format(java.lang.Object)

      */

     @Override

     public Object format(Object value) {

         StringBuilder buf = new StringBuilder();

         buf.append("[");

         if (!(value instanceof Collection)) {

                 throw new IllegalArgumentException("value was not an instance of Collection, instead was: " + (value == null ? null : value.getClass()));

         }

         @SuppressWarnings("unchecked")

         Collection<Object> collection = (Collection<Object>)value;

         Iterator<Object> i = collection.iterator();

         boolean hasNext = i.hasNext();

         while (hasNext) {

             Object elem = i.next();

             buf.append(elem);

             hasNext = i.hasNext();

             if (hasNext) {

                 buf.append(", ");

             }

         }

         buf.append("]");

         return buf.toString();

     }

 }