/*
* Copyright 2000-2014 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.buildhelpers;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import java.util.logging.Logger;
/**
* Generates Export-Packages attribute for OSGi compatible manifest.
* <p>
* Reads the included Java packages in a jar file, generates a corresponding
* Export-Package attribute, and appends it to the jar's MANIFEST.MF.
* <p>
* See #3521 for details.
*
* @author magi
*/
public class GeneratePackageExports {
private static final String EXPORT_PACKAGE_ATTRIBUTE = "Export-Package";
public static void main(String[] args) {
if (args.length < 2) {
System.err
.println("Invalid number of parameters\n"
+ "Usage: java -cp .. GenerateManifest <package.jar> <accepted package prefixes>\n"
+ "Use -Dvaadin.version to specify the version to be used for the packages");
System.exit(1);
}
// Open the 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);
}
// Accepted packages
List<String> acceptedPackagePrefixes = new ArrayList<String>();
for (int i = 1; i < args.length; i++) {
acceptedPackagePrefixes.add(args[i]);
}
// List the included Java packages
HashSet<String> packages = getPackages(jar, acceptedPackagePrefixes);
// Avoid writing empty Export-Package attribute
if (packages.isEmpty()) {
return;
}
String exportPackage = sortAndJoinPackages(packages);
// Read old manifest
Manifest oldMF = null;
try {
oldMF = jar.getManifest();
} catch (IOException e) {
e.printStackTrace();
}
Attributes mainAttributes = oldMF.getMainAttributes();
String existingExportPackage = mainAttributes
.getValue(EXPORT_PACKAGE_ATTRIBUTE);
if (existingExportPackage != null) {
exportPackage = existingExportPackage + "," + exportPackage;
}
// Jar must be closed before updating it below, as it's
// locked in Windows until closed. (#6045)
try {
jar.close();
} catch (IOException e) {
System.err.println("Unable to close JAR '" + jarFilename + "'");
}
// Create the modified manifest
ManifestWriter manifest = new ManifestWriter();
manifest.writeAttribute(EXPORT_PACKAGE_ATTRIBUTE, exportPackage);
// Update the manifest in the Jar. The jar must be closed
// before this is done.
int status = manifest.updateJar(jarFilename);
if (status != 0) {
System.exit(status);
}
}
private static String sortAndJoinPackages(HashSet<String> packages) {
// Produce an ordered listing of the package names
String packageArray[] = new String[packages.size()];
packages.toArray(packageArray);
Arrays.sort(packageArray);
StringBuilder joinedPackages = new StringBuilder();
for (int i = 0; i < packageArray.length; i++) {
if (i != 0) {
joinedPackages.append(",");
}
String version = getVersion(packageArray[i]);
String packageAndVersion = packageArray[i];
if (version != null) {
packageAndVersion += ";version=\"" + version + "\"";
} else {
Logger.getLogger(GeneratePackageExports.class.getName())
.severe("No version defined for " + packageArray[i]);
}
joinedPackages.append(packageAndVersion);
}
return joinedPackages.toString();
}
/**
* Tries to find version specified using system properties of type
* version.<java package>. Searches for the packge and then its parents
* recursively. Falls back to the "vaadin.version" system property if no
* other properties are found.
*
* @param javaPackage
* The package to determine a version for
* @return A version or null if no version has been defined
*/
private static String getVersion(String javaPackage) {
String packageVersion = System.getProperty("version." + javaPackage);
if (packageVersion != null) {
return packageVersion;
}
String parentPackage = null;
if (javaPackage.contains(".")) {
parentPackage = javaPackage.substring(0,
javaPackage.lastIndexOf('.'));
String parentVersion = getVersion(parentPackage);
if (parentVersion != null) {
return parentVersion;
}
}
String vaadinVersion = System.getProperty("vaadin.version");
if (vaadinVersion != null) {
return vaadinVersion;
}
return null;
}
private static HashSet<String> getPackages(JarFile jar,
List<String> acceptedPackagePrefixes) {
HashSet<String> packages = new HashSet<String>();
for (Enumeration<JarEntry> it = jar.entries(); it.hasMoreElements();) {
JarEntry entry = it.nextElement();
boolean classFile = entry.getName().endsWith(".class");
boolean directory = entry.isDirectory();
if (!classFile && !directory) {
continue;
}
if (!acceptEntry(entry.getName(), acceptedPackagePrefixes)) {
continue;
}
int lastSlash = entry.getName().lastIndexOf('/');
String pkg = entry.getName().substring(0, lastSlash)
.replace('/', '.');
packages.add(pkg);
}
return packages;
}
private static boolean acceptEntry(String name,
List<String> acceptedPackagePrefixes) {
for (String prefix : acceptedPackagePrefixes) {
if (name.startsWith(prefix)) {
return true;
}
}
return false;
}
}