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/**
 *  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.geronimo.kernel.util;

import java.util.Collection;

/**
 * @version $Rev: 983497 $ $Date: 2010-08-09 09:45:43 +0800 (Mon, 09 Aug 2010) $
 */
public class JoinUtils {

    public static String join(String delimiter, Collection collection) {
        if (collection.size() == 0) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        for (Object obj : collection) {
            sb.append(obj).append(delimiter);
        }
        return sb.substring(0, sb.length() - delimiter.length());
    }

    public static String join(String delimiter, Object... collection) {
        if (collection.length == 0) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        for (Object obj : collection) {
            sb.append(obj).append(delimiter);
        }
        return sb.substring(0, sb.length() - delimiter.length());
    }

    public static  String join(String delimiter, NameCallback nameCallback, T... collection) {
        if (collection.length == 0) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        for (T obj : collection) {
            sb.append(nameCallback.getName(obj)).append(delimiter);
        }
        return sb.substring(0, sb.length() - delimiter.length());
    }

    public static  String join(String delimiter, NameCallback nameCallback, Collection collection) {
        if (collection.size() == 0) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        for (T obj : collection) {
            sb.append(nameCallback.getName(obj)).append(delimiter);
        }
        return sb.substring(0, sb.length() - delimiter.length());
    }

    public static interface NameCallback {

        public String getName(T object);
    }
}