| //////////////////////////////////////////////////////////////////////////////// |
| // checkstyle: Checks Java source code for adherence to a set of rules. |
| // Copyright (C) 2001-2017 the original author or authors. |
| // |
| // This library is free software; you can redistribute it and/or |
| // modify it under the terms of the GNU Lesser General Public |
| // License as published by the Free Software Foundation; either |
| // version 2.1 of the License, or (at your option) any later version. |
| // |
| // This library 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. |
| // |
| // You should have received a copy of the GNU Lesser General Public |
| // License along with this library; if not, write to the Free Software |
| // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| package com.puppycrawl.tools.checkstyle.utils; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URI; |
| import java.net.URL; |
| |
| import com.puppycrawl.tools.checkstyle.api.CheckstyleException; |
| |
| /** |
| * Utility methods for suppression filters. |
| * |
| * @author Timur Tibeyev. |
| */ |
| public final class FilterUtils { |
| |
| /** Stop instances being created. **/ |
| private FilterUtils() { |
| |
| } |
| |
| /** |
| * Checks if suppression source with given fileName exists. |
| * @param fileName name of the suppressions file. |
| * @return true if suppression file exists, otherwise false |
| */ |
| public static boolean isFileExists(String fileName) { |
| boolean suppressionSourceExists = true; |
| InputStream sourceInput = null; |
| try { |
| final URI uriByFilename = CommonUtils.getUriByFilename(fileName); |
| final URL url = uriByFilename.toURL(); |
| sourceInput = url.openStream(); |
| } |
| catch (CheckstyleException | IOException ignored) { |
| suppressionSourceExists = false; |
| } |
| finally { |
| suppressionSourceExists = closeQuietlyWithResult(sourceInput, suppressionSourceExists); |
| } |
| return suppressionSourceExists; |
| } |
| |
| /** |
| * Close input. |
| * This method is required till https://github.com/cobertura/cobertura/issues/170 |
| * @param sourceInput stream to close |
| * @param suppressionSourceExists previous state of flag |
| * @return result of close operation |
| */ |
| private static boolean closeQuietlyWithResult(InputStream sourceInput, |
| boolean suppressionSourceExists) { |
| boolean closed = suppressionSourceExists; |
| if (sourceInput != null) { |
| try { |
| sourceInput.close(); |
| } |
| catch (IOException ignored) { |
| closed = false; |
| } |
| } |
| return closed; |
| } |
| } |