StringArrayConverter.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.activemq.transport.amqp.client.util;

import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

/**
 * Class for converting to/from String[] to be used instead of a
 * {@link java.beans.PropertyEditor} which otherwise causes memory leaks as the
 * JDK {@link java.beans.PropertyEditorManager} is a static class and has strong
 * references to classes, causing problems in hot-deployment environments.
 */
public class StringArrayConverter {

   public static String[] convertToStringArray(Object value) {
      if (value == null) {
         return null;
      }

      String text = value.toString();
      if (text == null || text.isEmpty()) {
         return null;
      }

      StringTokenizer stok = new StringTokenizer(text, ",");
      final List<String> list = new ArrayList<>();

      while (stok.hasMoreTokens()) {
         list.add(stok.nextToken());
      }

      String[] array = list.toArray(new String[list.size()]);
      return array;
   }

   public static String convertToString(String[] value) {
      if (value == null || value.length == 0) {
         return null;
      }

      StringBuffer result = new StringBuffer(String.valueOf(value[0]));
      for (int i = 1; i < value.length; i++) {
         result.append(",").append(value[i]);
      }

      return result.toString();
   }
}