/*
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* Copyright 2012 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.utils;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.List;
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/**
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* Utility class for arrays and collections.
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*
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* @author James Moger
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*
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*/
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public class ArrayUtils {
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public static boolean isEmpty(byte [] array) {
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return array == null || array.length == 0;
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}
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public static boolean isEmpty(char [] array) {
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return array == null || array.length == 0;
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}
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public static boolean isEmpty(Object [] array) {
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return array == null || array.length == 0;
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}
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public static boolean isEmpty(Collection<?> collection) {
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return collection == null || collection.size() == 0;
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}
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public static String toString(Collection<?> collection) {
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if (isEmpty(collection)) {
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return "";
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}
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StringBuilder sb = new StringBuilder();
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for (Object o : collection) {
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sb.append(o.toString()).append(", ");
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}
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// trim trailing comma-space
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sb.setLength(sb.length() - 2);
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return sb.toString();
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}
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public static Collection<String> fromString(String value) {
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if (StringUtils.isEmpty(value)) {
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value = "";
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}
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List<String> list = new ArrayList<String>();
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String [] values = value.split(",|;");
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for (String v : values) {
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String string = v.trim();
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if (!StringUtils.isEmpty(string)) {
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list.add(string);
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}
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}
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return list;
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}
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public static <X> List<X> join(List<X>... elements) {
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List<X> list = new ArrayList<X>();
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for (List<X> element : elements) {
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list.addAll(element);
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}
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return list;
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}
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public static <X> List<X> join(X[]... elements) {
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List<X> list = new ArrayList<X>();
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for (X[] element : elements) {
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list.addAll(Arrays.asList(element));
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}
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return list;
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}
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}
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