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package com.vaadin.buildhelpers;
import java.io.IOException;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Vector;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import java.util.jar.Attributes.Name;
/**
* Generates Export-Packages attribute for OSGi compatible manifest.
*
* Reads the included Java packages in Vaadin JAR, generates a corresponding
* MANIFEST.MF file, and replaces the dummy one in the JAR with the
* generated one.
*
* See #3521 for details.
*
* @author magi
*/
public class GeneratePackageExports {
public static void main(String[] args) {
if (args.length < 1) {
System.err.println("Invalid number of parameters\n"+
"Usage: java -cp .. GenerateManifest <package.jar>");
System.exit(1);
}
// Open tje JAR
String jarFilename = args[0];
JarFile jar = null;
try {
jar = new JarFile(jarFilename);
} catch (IOException e) {
System.err.println("Unable to open JAR '"+jarFilename+"'");
System.exit(1);
}
// List the included Java packages
HashSet<String> packages = new HashSet<String>();
for (Enumeration<JarEntry> it = jar.entries(); it.hasMoreElements();) {
JarEntry entry = it.nextElement();
if (entry.getName().startsWith("com") && entry.getName().endsWith(".class")) {
int lastSlash = entry.getName().lastIndexOf('/');
String pkg = entry.getName().substring(0, lastSlash).replace('/', '.');
packages.add(pkg);
}
}
// List theme packages
for (Enumeration<JarEntry> it = jar.entries(); it.hasMoreElements();) {
JarEntry entry = it.nextElement();
if (entry.isDirectory() && entry.getName().startsWith("VAADIN/themes")) {
// Strip ending slash
int lastSlash = entry.getName().lastIndexOf('/');
String pkg = entry.getName().substring(0, lastSlash).replace('/', '.');
packages.add(pkg);
}
}
// Replacement for the "Export-Package" attribute in the manifest
String exportPackage = "";
// Produce an ordered listing of the package names
String packageArray[] = new String[packages.size()];
packages.toArray(packageArray);
Arrays.sort(packageArray);
for (int i=0; i<packageArray.length; i++) {
if (i == 0)
exportPackage = packageArray[i];
else
exportPackage += ", " + packageArray[i];
}
// Read old manifest
Manifest oldMF = null;
try {
oldMF = jar.getManifest();
} catch (IOException e) {
e.printStackTrace();
}
// Read main attributes
Attributes mainAtts = oldMF.getMainAttributes();
Vector<String> keys = new Vector<String>(mainAtts.size());
for (Iterator<Object> attrit = mainAtts.keySet().iterator(); attrit.hasNext();) {
Name name = (Name) attrit.next();
keys.add(name.toString());
}
// Put the manifest version as the first line
String orderedKeys[] = new String[keys.size()];
keys.toArray(orderedKeys);
Arrays.sort(orderedKeys); // Must sort to be able to search
int mvPos = Arrays.binarySearch(orderedKeys, "Manifest-Version");
orderedKeys[mvPos] = orderedKeys[0]; // Swap
orderedKeys[0] = "Manifest-Version";
// This final ordering is just for esthetic reasons and
// in practice unnecessary and will actually be messed up
// when the 'jar' command reads the manifest
Arrays.sort(orderedKeys, 1, orderedKeys.length-1);
// Create the modified manifest
ManifestWriter manifest = new ManifestWriter();
for (int i=0; i<orderedKeys.length; i++) {
// Skip an existing Export-Package attribute
if (orderedKeys[i].equals("Export-Package")) {
// Copy the attribute to the modified manifest
manifest.writeAttribute(orderedKeys[i], mainAtts.getValue(orderedKeys[i]));
}
}
// Add the Export-Package attribute at the end of the manifest.
// The alternative would be replacing an existing attribute in
// the loop above, but it's not guaranteed that it exists.
manifest.writeAttribute("Export-Package", exportPackage);
// Update the manifest in the Jar
int status = manifest.updateJar(jarFilename);
if (status != 0)
System.exit(status);
}
}
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