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/*
* 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();
}
}
}
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