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/*
* 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.size() == 0;
}
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;
}
}
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