JarLoaderpublic class JarLoader extends SecureClassLoader
| Fields Summary |
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| private URL | urlBase | | public boolean | printLoadMessages | | Hashtable | classArrays | | Hashtable | classIds | | static int | groupNum | | ThreadGroup | threadGroup |
| Constructors Summary |
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public JarLoader(String base, ClassLoader parent)
super(parent);
try {
if (!(base.endsWith("/")))
base = base + "/";
urlBase = new URL(base);
classArrays = new Hashtable();
classIds = new Hashtable();
} catch (Exception e) {
throw new IllegalArgumentException(base);
}
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| Methods Summary |
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| public void | checkPackageAccess(java.lang.String name)
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkPackageAccess(name);
| | protected java.lang.Class | findClass(java.lang.String name)
String urlName = name.replace('.", '/");
byte buf[];
Class cl;
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
int i = name.lastIndexOf('.");
if (i >= 0)
sm.checkPackageDefinition(name.substring(0, i));
}
buf = (byte[]) classArrays.get(urlName);
if (buf != null) {
// In 1.2 beta 4, the code source requires an array of certificates
// instead of an arragy of objects
java.security.cert.Certificate ids[] =
(java.security.cert.Certificate []) classIds.get(urlName);
CodeSource cs = new CodeSource(urlBase, ids);
cl = defineClass(name, buf, 0, buf.length, cs);
return cl;
}
try {
URL url = new URL(urlBase, urlName + ".class");
if (printLoadMessages)
System.out.println("Loading " + url);
InputStream is = url.openConnection().getInputStream();
buf = getClassBytes(is);
CodeSource cs = new CodeSource(urlBase, null);
cl = defineClass(name, buf, 0, buf.length, cs);
return cl;
} catch (Exception e) {
System.out.println("Can't load " + name + ": " + e);
return null;
}
| | private byte[] | getClassBytes(java.io.InputStream is)
ByteArrayOutputStream baos = new ByteArrayOutputStream();
BufferedInputStream bis = new BufferedInputStream(is);
boolean eof = false;
while (!eof) {
try {
int i = bis.read();
if (i == -1)
eof = true;
else baos.write(i);
} catch (IOException e) {
return null;
}
}
return baos.toByteArray();
| | java.lang.String | getHost()
return urlBase.getHost();
| | java.lang.ThreadGroup | getThreadGroup()
if (threadGroup == null)
threadGroup = new ThreadGroup("JavaRuner ThreadGroup-" + groupNum++);
return threadGroup;
| | private void | loadClassBytes(java.util.jar.JarInputStream jis, java.lang.String jarName, java.util.jar.JarEntry je)
if (printLoadMessages)
System.out.println("\t" + jarName);
BufferedInputStream jarBuf = new BufferedInputStream(jis);
ByteArrayOutputStream jarOut = new ByteArrayOutputStream();
int b;
try {
while ((b = jarBuf.read()) != -1)
jarOut.write(b);
String className = jarName.substring(0, jarName.length() - 6);
classArrays.put(className, jarOut.toByteArray());
// In 1.2 beta 4, the getIdentities method has been replaced with
// the getCertificates method, which is very convenient, since
// we need a certificate to initialize the codebase anyway
// classIds.put(className, je.getIdentities());
java.security.cert.Certificate c[] = je.getCertificates();
if (c == null)
c = new java.security.cert.Certificate[0];
classIds.put(className, c);
} catch (IOException ioe) {
System.out.println("Error reading entry " + jarName);
}
| | public void | readJarFile(java.lang.String name)
URL jarUrl = null;
JarInputStream jis;
JarEntry je;
try {
jarUrl = new URL(urlBase, name);
} catch (MalformedURLException mue) {
System.out.println("Unknown jar file " + name);
return;
}
if (printLoadMessages)
System.out.println("Loading jar file " + jarUrl);
try {
jis = new JarInputStream(jarUrl.openConnection().getInputStream());
} catch (IOException ioe) {
System.out.println("Can't open jar file " + jarUrl);
return;
}
try {
while ((je = jis.getNextJarEntry()) != null) {
String jarName = je.getName();
if (jarName.endsWith(".class"))
loadClassBytes(jis, jarName, je);
// else ignore it; it could be an image or audio file
jis.closeEntry();
}
} catch (IOException ioe) {
System.out.println("Badly formatted jar file");
}
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