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Diffstat (limited to 'src/proguard/UpToDateChecker.java')
-rw-r--r-- | src/proguard/UpToDateChecker.java | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/src/proguard/UpToDateChecker.java b/src/proguard/UpToDateChecker.java new file mode 100644 index 0000000..9fa5d16 --- /dev/null +++ b/src/proguard/UpToDateChecker.java @@ -0,0 +1,153 @@ +/* + * 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(); + } + } +} |