| /* |
| * Copyright 2013-present Facebook, Inc. |
| * |
| * 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.facebook.buck.java.abi; |
| |
| import java.util.Iterator; |
| |
| /** |
| * Modeled as a drop-in replacement for guava's {@link com.google.common.base.Joiner}, but with no |
| * third party deps. |
| */ |
| class Joiner { |
| private String separator; |
| |
| private Joiner(String separator) { |
| if (separator == null) { |
| throw new NullPointerException("Joiner separator must not be null"); |
| } |
| this.separator = separator; |
| } |
| |
| public static Joiner on(String separator) { |
| return new Joiner(separator); |
| } |
| |
| public void appendTo(StringBuilder builder, Iterable<?> toJoin) { |
| Iterator<?> iterator = toJoin.iterator(); |
| if (!iterator.hasNext()) { |
| return; |
| } |
| |
| builder.append(String.valueOf(iterator.next())); |
| while (iterator.hasNext()) { |
| builder.append(separator).append(iterator.next()); |
| } |
| } |
| |
| public String join(Iterable<?> toJoin) { |
| StringBuilder builder = new StringBuilder(); |
| appendTo(builder, toJoin); |
| return builder.toString(); |
| } |
| } |