| 1 | /* |
|---|---|
| 2 | * Copyright (C) 2007-2010 Júlio Vilmar Gesser. |
| 3 | * Copyright (C) 2011, 2013-2020 The JavaParser Team. |
| 4 | * |
| 5 | * This file is part of JavaParser. |
| 6 | * |
| 7 | * JavaParser can be used either under the terms of |
| 8 | * a) the GNU Lesser General Public License as published by |
| 9 | * the Free Software Foundation, either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * b) the terms of the Apache License |
| 12 | * |
| 13 | * You should have received a copy of both licenses in LICENCE.LGPL and |
| 14 | * LICENCE.APACHE. Please refer to those files for details. |
| 15 | * |
| 16 | * JavaParser is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU Lesser General Public License for more details. |
| 20 | */ |
| 21 | |
| 22 | package com.github.javaparser.utils; |
| 23 | |
| 24 | /** |
| 25 | * Builds a string containing a list of items with a prefix, a postfix, and a separator. |
| 26 | * <br>Example: (1,2,3) which has prefix "(", separator ",", postfix ")" and the items 1 through 3. |
| 27 | * <p/>Java 8 offers the very nice Collectors.joining(String, String, String) which does the same thing. |
| 28 | */ |
| 29 | public class SeparatedItemStringBuilder { |
| 30 | private final String separator; |
| 31 | private final String postfix; |
| 32 | private boolean hasItems = false; |
| 33 | private StringBuilder builder; |
| 34 | |
| 35 | public SeparatedItemStringBuilder(String prefix, String separator, String postfix) { |
| 36 | builder = new StringBuilder(prefix); |
| 37 | this.separator = separator; |
| 38 | this.postfix = postfix; |
| 39 | |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Add one item. Either pass a string, or a format for String.format and corresponding arguments. |
| 44 | */ |
| 45 | public SeparatedItemStringBuilder append(CharSequence format, Object... args) { |
| 46 | if (hasItems) { |
| 47 | builder.append(separator); |
| 48 | } |
| 49 | builder.append(String.format(format.toString(), args)); |
| 50 | hasItems = true; |
| 51 | return this; |
| 52 | } |
| 53 | |
| 54 | public boolean hasItems() { |
| 55 | return hasItems; |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Convert the builder into its final string representation. |
| 60 | */ |
| 61 | @Override |
| 62 | public String toString() { |
| 63 | // This order of toStringing avoids debuggers from making a mess. |
| 64 | return builder.toString() + postfix; |
| 65 | } |
| 66 | } |
| 67 |
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