activemq-client/src/main/java/org/apache/activemq/util/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.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.length() == 0) {
            return null;
        }

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

        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();
    }

}