/*
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* ProGuard -- shrinking, optimization, obfuscation, and preverification
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* of Java bytecode.
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*
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* Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program 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 for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package proguard;
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import java.io.File;
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/**
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* This class checks whether the output is up to date.
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*
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* @author Eric Lafortune
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*/
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public class UpToDateChecker
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{
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private final Configuration configuration;
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/**
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* Creates a new UpToDateChecker with the given configuration.
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*/
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public UpToDateChecker(Configuration configuration)
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{
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this.configuration = configuration;
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}
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/**
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* Returns whether the output is up to date, based on the modification times
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* of the input jars, output jars, and library jars (or directories).
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*/
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public boolean check()
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{
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try
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{
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ModificationTimeChecker checker = new ModificationTimeChecker();
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checker.updateInputModificationTime(configuration.lastModified);
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ClassPath programJars = configuration.programJars;
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ClassPath libraryJars = configuration.libraryJars;
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// Check the dates of the program jars, if any.
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if (programJars != null)
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{
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for (int index = 0; index < programJars.size(); index++)
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{
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// Update the input and output modification times.
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ClassPathEntry classPathEntry = programJars.get(index);
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checker.updateModificationTime(classPathEntry.getFile(),
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classPathEntry.isOutput());
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}
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}
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// Check the dates of the library jars, if any.
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if (libraryJars != null)
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{
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for (int index = 0; index < libraryJars.size(); index++)
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{
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// Update the input modification time.
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ClassPathEntry classPathEntry = libraryJars.get(index);
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checker.updateModificationTime(classPathEntry.getFile(),
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false);
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}
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}
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// Check the dates of the auxiliary input files.
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checker.updateInputModificationTime(configuration.applyMapping);
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checker.updateInputModificationTime(configuration.obfuscationDictionary);
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checker.updateInputModificationTime(configuration.classObfuscationDictionary);
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checker.updateInputModificationTime(configuration.packageObfuscationDictionary);
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// Check the dates of the auxiliary output files.
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checker.updateOutputModificationTime(configuration.printSeeds);
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checker.updateOutputModificationTime(configuration.printUsage);
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checker.updateOutputModificationTime(configuration.printMapping);
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checker.updateOutputModificationTime(configuration.printConfiguration);
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checker.updateOutputModificationTime(configuration.dump);
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}
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catch (IllegalStateException e)
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{
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// The output is outdated.
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return false;
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}
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System.out.println("The output seems up to date");
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return true;
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}
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/**
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* This class maintains the modification times of input and output.
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* The methods throw an IllegalStateException if the output appears
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* outdated.
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*/
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private static class ModificationTimeChecker {
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private long inputModificationTime = Long.MIN_VALUE;
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private long outputModificationTime = Long.MAX_VALUE;
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/**
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* Updates the input modification time based on the given file or
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* directory (recursively).
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*/
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public void updateInputModificationTime(File file)
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{
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if (file != null)
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{
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updateModificationTime(file, false);
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}
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}
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/**
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* Updates the input modification time based on the given file or
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* directory (recursively).
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*/
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public void updateOutputModificationTime(File file)
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{
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if (file != null && file.getName().length() > 0)
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{
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updateModificationTime(file, true);
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}
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}
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/**
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* Updates the specified modification time based on the given file or
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* directory (recursively).
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*/
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public void updateModificationTime(File file, boolean isOutput)
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{
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// Is it a directory?
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if (file.isDirectory())
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{
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// Ignore the directory's modification time; just recurse on
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// its files.
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File[] files = file.listFiles();
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// Still, an empty output directory is probably a sign that it
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// is not up to date.
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if (files.length == 0 && isOutput)
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{
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updateOutputModificationTime(Long.MIN_VALUE);
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}
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for (int index = 0; index < files.length; index++)
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{
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updateModificationTime(files[index], isOutput);
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}
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}
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else
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{
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// Update with the file's modification time.
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updateModificationTime(file.lastModified(), isOutput);
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}
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}
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/**
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* Updates the specified modification time.
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*/
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public void updateModificationTime(long time, boolean isOutput)
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{
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if (isOutput)
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{
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updateOutputModificationTime(time);
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}
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else
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{
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updateInputModificationTime(time);
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}
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}
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/**
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* Updates the input modification time.
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*/
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public void updateInputModificationTime(long time)
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{
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if (inputModificationTime < time)
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{
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inputModificationTime = time;
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checkModificationTimes();
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}
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}
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/**
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* Updates the output modification time.
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*/
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public void updateOutputModificationTime(long time)
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{
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if (outputModificationTime > time)
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{
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outputModificationTime = time;
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checkModificationTimes();
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}
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}
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private void checkModificationTimes()
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{
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if (inputModificationTime > outputModificationTime)
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{
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throw new IllegalStateException("The output is outdated");
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}
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}
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}
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}
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