/*
* FindBugs - Find Bugs in Java programs
* Copyright (C) 2003-2007 University of Maryland
*
* 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 edu.umd.cs.findbugs.classfile.impl;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;
import edu.umd.cs.findbugs.classfile.Global;
import edu.umd.cs.findbugs.classfile.ICodeBaseLocator;
import edu.umd.cs.findbugs.log.Profiler;
/**
* @author pugh
*/
public class ZipCodeBaseFactory {
public static AbstractScannableCodeBase makeZipCodeBase(ICodeBaseLocator codeBaseLocator, File file) throws IOException {
Profiler profiler = Global.getAnalysisCache().getProfiler();
profiler.start(ZipCodeBaseFactory.class);
try {
return countUsingZipFile(codeBaseLocator, file);
} finally {
profiler.end(ZipCodeBaseFactory.class);
}
}
/**
* @param codeBaseLocator
* @param file
* @return
* @throws IOException
* @throws FileNotFoundException
*/
private static AbstractScannableCodeBase countUsingZipInputStream(ICodeBaseLocator codeBaseLocator, File file)
throws IOException, FileNotFoundException {
long size = file.length();
long estimatedEntries = size / 2000;
if (estimatedEntries < 20000)
return new ZipFileCodeBase(codeBaseLocator, file);
int zipEntries = 0;
ZipInputStream in = new ZipInputStream(new BufferedInputStream(new FileInputStream(file)));
try {
for(ZipEntry e; (e = in.getNextEntry()) != null && zipEntries < 30010; )
zipEntries++;
} finally {
in.close();
}
if (zipEntries < 30010)
return new ZipFileCodeBase(codeBaseLocator, file);
return new ZipInputStreamCodeBase(codeBaseLocator, file);
}
/**
* @param codeBaseLocator
* @param file
* @return
* @throws IOException
* @throws ZipException
*/
private static AbstractScannableCodeBase countUsingZipFile(ICodeBaseLocator codeBaseLocator, File file) throws IOException,
ZipException {
long size = file.length();
long estimatedEntries = size / 2000;
if (estimatedEntries < 20000)
return new ZipFileCodeBase(codeBaseLocator, file);
int zipEntries = 0;
ZipFile in = new ZipFile(file);
try {
for(Enumeration<?> e = in.entries(); e.hasMoreElements() && zipEntries < 30010; ) {
e.nextElement();
zipEntries++;
}
} finally {
in.close();
}
if (zipEntries < 30010)
return new ZipFileCodeBase(codeBaseLocator, file);
return new ZipInputStreamCodeBase(codeBaseLocator, file);
}
}
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