/**
* Sets the System security.
*
* <p>If there is a security manager already installed, this method first calls the security
* manager's <code>checkPermission</code> method with a <code>
* RuntimePermission("setSecurityManager")</code> permission to ensure it's ok to replace the
* existing security manager. This may result in throwing a <code>SecurityException</code>.
*
* <p>Otherwise, the argument is established as the current security manager. If the argument is
* <code>null</code> and no security manager has been established, then no action is taken and the
* method simply returns.
*
* @param s the security manager.
* @exception SecurityException if the security manager has already been set and its <code>
* checkPermission</code> method doesn't allow it to be replaced.
* @see #getSecurityManager
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
*/
public static void setSecurityManager(final SecurityManager s) {
try {
s.checkPackageAccess("java.lang");
} catch (Exception e) {
// no-op
}
setSecurityManager0(s);
}
/**
* loads a class from a file or a parent classloader.
*
* @param name of the class to be loaded
* @param lookupScriptFiles if false no lookup at files is done at all
* @param preferClassOverScript if true the file lookup is only done if there is no class
* @param resolve see {@link java.lang.ClassLoader#loadClass(java.lang.String, boolean)}
* @return the class found or the class created from a file lookup
* @throws ClassNotFoundException if the class could not be found
* @throws CompilationFailedException if the source file could not be compiled
*/
public Class loadClass(
final String name, boolean lookupScriptFiles, boolean preferClassOverScript, boolean resolve)
throws ClassNotFoundException, CompilationFailedException {
// look into cache
Class cls = getClassCacheEntry(name);
// enable recompilation?
boolean recompile = isRecompilable(cls);
if (!recompile) return cls;
// try parent loader
ClassNotFoundException last = null;
try {
Class parentClassLoaderClass = super.loadClass(name, resolve);
// always return if the parent loader was successful
if (cls != parentClassLoaderClass) return parentClassLoaderClass;
} catch (ClassNotFoundException cnfe) {
last = cnfe;
} catch (NoClassDefFoundError ncdfe) {
if (ncdfe.getMessage().indexOf("wrong name") > 0) {
last = new ClassNotFoundException(name);
} else {
throw ncdfe;
}
}
// check security manager
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
String className = name.replace('/', '.');
int i = className.lastIndexOf('.');
// no checks on the sun.reflect classes for reflection speed-up
// in particular ConstructorAccessorImpl, MethodAccessorImpl, FieldAccessorImpl and
// SerializationConstructorAccessorImpl
// which are generated at runtime by the JDK
if (i != -1 && !className.startsWith("sun.reflect.")) {
sm.checkPackageAccess(className.substring(0, i));
}
}
// prefer class if no recompilation
if (cls != null && preferClassOverScript) return cls;
// at this point the loading from a parent loader failed
// and we want to recompile if needed.
if (lookupScriptFiles) {
// try groovy file
try {
// check if recompilation already happened.
final Class classCacheEntry = getClassCacheEntry(name);
if (classCacheEntry != cls) return classCacheEntry;
URL source = resourceLoader.loadGroovySource(name);
// if recompilation fails, we want cls==null
Class oldClass = cls;
cls = null;
cls = recompile(source, name, oldClass);
} catch (IOException ioe) {
last = new ClassNotFoundException("IOException while opening groovy source: " + name, ioe);
} finally {
if (cls == null) {
removeClassCacheEntry(name);
} else {
setClassCacheEntry(cls);
}
}
}
if (cls == null) {
// no class found, there should have been an exception before now
if (last == null) throw new AssertionError(true);
throw last;
}
return cls;
}
