| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program 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 General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| package proguard; |
| |
| import java.io.File; |
| |
| /** |
| * This class checks whether the output is up to date. |
| * |
| * @author Eric Lafortune |
| */ |
| public class UpToDateChecker |
| { |
| private final Configuration configuration; |
| |
| |
| /** |
| * Creates a new UpToDateChecker with the given configuration. |
| */ |
| public UpToDateChecker(Configuration configuration) |
| { |
| this.configuration = configuration; |
| } |
| |
| |
| /** |
| * Returns whether the output is up to date, based on the modification times |
| * of the input jars, output jars, and library jars (or directories). |
| */ |
| public boolean check() |
| { |
| long inputLastModified = configuration.lastModified; |
| long outputLastModified = Long.MAX_VALUE; |
| |
| ClassPath programJars = configuration.programJars; |
| ClassPath libraryJars = configuration.libraryJars; |
| |
| // Check the dates of the program jars, if any. |
| if (programJars != null) |
| { |
| for (int index = 0; index < programJars.size(); index++) |
| { |
| // Break early, if possible. |
| if (inputLastModified >= outputLastModified) |
| { |
| break; |
| } |
| |
| // Update the input and output modification times. |
| ClassPathEntry classPathEntry = programJars.get(index); |
| if (classPathEntry.isOutput()) |
| { |
| long lastModified = lastModified(classPathEntry.getFile(), true); |
| if (outputLastModified > lastModified) |
| { |
| outputLastModified = lastModified; |
| } |
| } |
| else |
| { |
| long lastModified = lastModified(classPathEntry.getFile(), false); |
| if (inputLastModified < lastModified) |
| { |
| inputLastModified = lastModified; |
| } |
| } |
| } |
| } |
| |
| // Check the dates of the library jars, if any. |
| if (libraryJars != null) |
| { |
| for (int index = 0; index < libraryJars.size(); index++) |
| { |
| // Break early, if possible. |
| if (inputLastModified >= outputLastModified) |
| { |
| break; |
| } |
| |
| // Update the input modification time. |
| ClassPathEntry classPathEntry = libraryJars.get(index); |
| long lastModified = lastModified(classPathEntry.getFile(), false); |
| if (inputLastModified < lastModified) |
| { |
| inputLastModified = lastModified; |
| } |
| } |
| } |
| |
| boolean outputUpToDate = inputLastModified < outputLastModified; |
| if (outputUpToDate) |
| { |
| System.out.println("The output is up to date"); |
| } |
| |
| return outputUpToDate; |
| } |
| |
| |
| /** |
| * Returns the minimum or maximum modification time of the given file or |
| * of the files in the given directory (recursively). |
| */ |
| private long lastModified(File file, boolean minimum) |
| { |
| // Is it a directory? |
| if (file.isDirectory()) |
| { |
| // Ignore the directory's modification time; just recurse on its files. |
| File[] files = file.listFiles(); |
| |
| // Still, an empty output directory is probably a sign that it is |
| // not up to date. |
| long lastModified = files.length != 0 && minimum ? |
| Long.MAX_VALUE : 0L; |
| |
| for (int index = 0; index < files.length; index++) |
| { |
| long fileLastModified = lastModified(files[index], minimum); |
| if ((lastModified < fileLastModified) ^ minimum) |
| { |
| lastModified = fileLastModified; |
| } |
| } |
| |
| return lastModified; |
| } |
| else |
| { |
| // Return the file's modification time. |
| return file.lastModified(); |
| } |
| } |
| } |