| /* |
| * 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.ziplock; |
| |
| import java.io.File; |
| import java.lang.reflect.Method; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| public class Join { |
| |
| public static final MethodCallback METHOD_CALLBACK = new MethodCallback(); |
| |
| public static final ClassCallback CLASS_CALLBACK = new ClassCallback(); |
| |
| public static String join(final String delimiter, final Collection collection) { |
| if (collection.size() == 0) { |
| return ""; |
| } |
| final StringBuilder sb = new StringBuilder(); |
| for (final Object obj : collection) { |
| sb.append(obj).append(delimiter); |
| } |
| return sb.substring(0, sb.length() - delimiter.length()); |
| } |
| |
| public static String join(final String delimiter, final Object... collection) { |
| if (collection.length == 0) { |
| return ""; |
| } |
| final StringBuilder sb = new StringBuilder(); |
| for (final Object obj : collection) { |
| sb.append(obj).append(delimiter); |
| } |
| return sb.substring(0, sb.length() - delimiter.length()); |
| } |
| |
| public static <T> String join(final String delimiter, final NameCallback<T> nameCallback, final T... collection) { |
| if (collection.length == 0) { |
| return ""; |
| } |
| final StringBuilder sb = new StringBuilder(); |
| for (final T obj : collection) { |
| sb.append(nameCallback.getName(obj)).append(delimiter); |
| } |
| return sb.substring(0, sb.length() - delimiter.length()); |
| } |
| |
| public static <T> String join(final String delimiter, final NameCallback<T> nameCallback, final Collection<T> collection) { |
| if (collection.size() == 0) { |
| return ""; |
| } |
| final StringBuilder sb = new StringBuilder(); |
| for (final T obj : collection) { |
| sb.append(nameCallback.getName(obj)).append(delimiter); |
| } |
| return sb.substring(0, sb.length() - delimiter.length()); |
| } |
| |
| public static <T> List<String> strings(final Collection<T> collection, final NameCallback<T> callback) { |
| final List<String> list = new ArrayList<String>(); |
| |
| for (final T t : collection) { |
| final String name = callback.getName(t); |
| list.add(name); |
| } |
| |
| return list; |
| } |
| |
| public interface NameCallback<T> { |
| String getName(T object); |
| } |
| |
| public static class FileCallback implements NameCallback<File> { |
| |
| public String getName(final File file) { |
| return file.getName(); |
| } |
| } |
| |
| public static class MethodCallback implements NameCallback<Method> { |
| |
| public String getName(final Method method) { |
| return method.getName(); |
| } |
| } |
| |
| public static class ClassCallback implements NameCallback<Class<?>> { |
| |
| public String getName(final Class<?> cls) { |
| return cls.getName(); |
| } |
| } |
| } |