120 lines
3.7 KiB
Java
120 lines
3.7 KiB
Java
/*
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* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package vm.share;
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import java.io.*;
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import java.util.LinkedList;
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/**
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* Utility class intended to read file line by line and skip comments.
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*/
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public class CommentedFileReader {
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/**
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* Type of comments that should be removed from file.
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*/
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public static enum CommentStyle {
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/**
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* Comments started with <i>#</i>.
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*/
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BASH,
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/**
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* Comments started with <i>//</i>.
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*/
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JAVA
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}
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/**
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* Get lines from specified file and filter out comments.
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* Only comments in BASH style will be filtered out.
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*
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* @param path to file that should be readed
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* @return filtered lines from file
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*/
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public static String[] readFile(String path) throws IOException {
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return readFile(new File(path), CommentStyle.BASH);
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}
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/**
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* Get lines from specified file and filter out comments.
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* Only comments in BASH style will be filtered out.
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*
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* @param file that should be readed
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* @return filtered lines from file
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*/
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public static String[] readFile(File file) throws IOException {
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return readFile(file, CommentStyle.BASH);
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}
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/**
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* Get lines from specified file without comments.
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*
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* @param path to file that should be readed
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* @param commentStyle describes what strings will be treated as comments
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* @return filtered lines from file
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*/
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public static String[] readFile(String path, CommentStyle commentStyle) throws IOException {
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return readFile(new File(path), commentStyle);
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}
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/**
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* Get lines from specified file without comments.
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*
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* @param file that should be readed
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* @param commentStyle describes what strings will be treated as comments
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* @return filtered lines from file
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*/
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public static String[] readFile(File file, CommentStyle commentStyle) throws IOException {
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LinkedList<String> entries = new LinkedList<String>();
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BufferedReader reader = new BufferedReader(new FileReader(file));
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String commentBeginning;
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switch (commentStyle) {
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case BASH:
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commentBeginning = "#";
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break;
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case JAVA:
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commentBeginning = "//";
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break;
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default:
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throw new IllegalArgumentException("Unknown comment style");
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}
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while (true) {
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String entry = reader.readLine();
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if (entry == null) {
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break;
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}
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entry = entry.replaceAll(commentBeginning + ".*", "").trim();
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if (entry.length() > 0) {
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entries.add(entry);
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}
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}
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return entries.toArray(new String[entries.size()]);
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}
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}
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