com.github.javaparser.utils.SeparatedItemStringBuilder Maven / Gradle / Ivy
/*
* Copyright (C) 2007-2010 Júlio Vilmar Gesser.
* Copyright (C) 2011, 2013-2021 The JavaParser Team.
*
* This file is part of JavaParser.
*
* JavaParser can be used either under the terms of
* a) the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* b) the terms of the Apache License
*
* You should have received a copy of both licenses in LICENCE.LGPL and
* LICENCE.APACHE. Please refer to those files for details.
*
* JavaParser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*/
package com.github.javaparser.utils;
/**
* Builds a string containing a list of items with a prefix, a postfix, and a separator.
*
Example: (1,2,3) which has prefix "(", separator ",", postfix ")" and the items 1 through 3.
* Java 8 offers the very nice Collectors.joining(String, String, String) which does the same thing.
*/
public class SeparatedItemStringBuilder {
private final String separator;
private final String postfix;
private boolean hasItems = false;
private StringBuilder builder;
public SeparatedItemStringBuilder(String prefix, String separator, String postfix) {
builder = new StringBuilder(prefix);
this.separator = separator;
this.postfix = postfix;
}
/**
* Add one item. Either pass a string, or a format for String.format and corresponding arguments.
*/
public SeparatedItemStringBuilder append(CharSequence format, Object... args) {
if (hasItems) {
builder.append(separator);
}
builder.append(String.format(format.toString(), args));
hasItems = true;
return this;
}
public boolean hasItems() {
return hasItems;
}
/**
* Convert the builder into its final string representation.
*/
@Override
public String toString() {
// This order of toStringing avoids debuggers from making a mess.
return builder.toString() + postfix;
}
}