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/*
* Jalview - A Sequence Alignment Editor and Viewer (2.11.4.1)
* Copyright (C) 2024 The Jalview Authors
*
* This file is part of Jalview.
*
* Jalview 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 3
* of the License, or (at your option) any later version.
*
* Jalview 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 Jalview. If not, see <http://www.gnu.org/licenses/>.
* The Jalview Authors are detailed in the 'AUTHORS' file.
*/
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
public class getJavaVersion
{
/**
* Takes a set of Jars and/or class files as arguments. Reports the java
* version for the classes
*/
public static void main(String[] args) throws IOException
{
Hashtable observed = new Hashtable();
for (int i = 0; i < args.length; i++)
{
checkClassVersion(args[i], observed);
}
printVersions(observed, System.out);
}
public static void printVersions(Hashtable observed,
java.io.PrintStream outs)
{
if (observed.size() > 0)
{
int space = 0;
String key = null;
for (Enumeration keys = observed.keys(); keys.hasMoreElements();)
{
key = (String) keys.nextElement();
if (space++ > 0)
{
outs.print(" ");
}
outs.print(key);
}
outs.print("\n");
}
}
private static void checkClassVersion(String filename, Hashtable observed)
throws IOException
{
String version = checkClassVersion(filename);
if (version == null)
{
// System.err.println("Reading "+filename+" as jar:");
try
{
JarInputStream jis = new JarInputStream(new FileInputStream(
filename));
JarEntry entry;
Hashtable perjar = new Hashtable();
while ((entry = jis.getNextJarEntry()) != null)
{
if (entry != null)
{
if (entry.getName().endsWith(".class"))
{
try
{
version = getVersion(new DataInputStream(jis));
if (version != null)
{
addVersion(version, observed);
addVersion(version, perjar);
}
} catch (Exception e)
{
}
}
}
}
System.err.println("Jar : " + filename);
printVersions(perjar, System.err);
} catch (Exception e)
{
}
}
else
{
addVersion(version, observed);
}
}
private static void addVersion(String version, Hashtable observed)
{
if (version != null)
{
// System.err.println("Version is '"+version+"'");
int[] vrs = (int[]) observed.get(version);
if (vrs == null)
{
vrs = new int[] { 0 };
}
vrs[0]++;
observed.put(version, vrs);
}
}
private static String checkClassVersion(String filename)
throws IOException
{
DataInputStream in = new DataInputStream(new FileInputStream(filename));
return getVersion(in);
}
private static Hashtable versions = null;
private static String parseVersions(int minor, int major)
{
if (versions == null)
{
versions = new Hashtable();
versions.put("45.3", "1.0.2");
versions.put("45.3", "1.1");
versions.put("46.0", "1.2");
versions.put("47.0", "1.3");
versions.put("48.0", "1.4");
versions.put("49.0", "1.5");
versions.put("50.0", "1.6");
versions.put("51.0", "1.7");
versions.put("52.0", "1.8");
versions.put("53.0", "9");
versions.put("54.0", "10");
versions.put("55.0", "11");
}
String version = (String) versions.get(major + "." + minor);
if (version == null)
{
// get nearest known version
version = (String) versions.get(major + ".0");
}
// System.err.println("Version "+version);
if (version == null)
{
versions.put(major + "." + minor, "Class v" + major + ".0");
}
return version;
}
private static String getVersion(DataInputStream in) throws IOException
{
int magic = in.readInt();
if (magic != 0xcafebabe)
{
return null;
}
int minor = in.readUnsignedShort();
int major = in.readUnsignedShort();
// System.err.println("Version "+major+"."+minor);
return parseVersions(minor, major);
}
}
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