/* * Copyright 2012 gitblit.com. * * 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 com.gitblit.utils; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.List; /** * Utility class for arrays and collections. * * @author James Moger * */ public class ArrayUtils { public static boolean isEmpty(byte [] array) { return array == null || array.length == 0; } public static boolean isEmpty(char [] array) { return array == null || array.length == 0; } public static boolean isEmpty(Object [] array) { return array == null || array.length == 0; } public static boolean isEmpty(Collection<?> collection) { return collection == null || collection.isEmpty(); } public static String toString(Collection<?> collection) { if (isEmpty(collection)) { return ""; } StringBuilder sb = new StringBuilder(); for (Object o : collection) { sb.append(o.toString()).append(", "); } // trim trailing comma-space sb.setLength(sb.length() - 2); return sb.toString(); } public static Collection<String> fromString(String value) { if (StringUtils.isEmpty(value)) { value = ""; } List<String> list = new ArrayList<String>(); String [] values = value.split(",|;"); for (String v : values) { String string = v.trim(); if (!StringUtils.isEmpty(string)) { list.add(string); } } return list; } public static <X> List<X> join(List<X>... elements) { List<X> list = new ArrayList<X>(); for (List<X> element : elements) { list.addAll(element); } return list; } public static <X> List<X> join(X[]... elements) { List<X> list = new ArrayList<X>(); for (X[] element : elements) { list.addAll(Arrays.asList(element)); } return list; } }