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package org.glassfish.appclient.client;
import java.util.Collection;
import java.util.Collections;
/**
* Masks classes or resources that are listed in the "endorsed" packages that
* GlassFish provides.
*
* During Java Web Start launches we cannot set java.endorsed.dirs to have
* the bootstrap class loader look in the GlassFish-provided JARs for classes
* and resources that would otherwise be found in the system JARs (rt.jar for
* example). We need some other way of making sure the GlassFish-provided
* JARs are used. Those JARs are listed in the JNLP documents for the app,
* so the JNLPClassLoader which Java Web Start provides will find them if we
* give it a chance.
*
* This loader knows what packages are in the GlassFish-provided endorsed JARs
* and will report any matching class or resource as not found. When an
* instance of this loader is inserted as the parent of the JNLPClassLoader then
* the JNLPClassLoader will delegate to it first. The masking loader will
* report GlassFish-provided content as not found, so the JNLPClassLoader will
* try to resolve them itself. That resolution will use the downloaded GlassFish
* JARs, thereby making sure the Java Web Start launch uses the GlassFish-provided
* endorsed JARs instead of whatever happens to be in the Java system JARs.
*
* @author Tim Quinn
*/
class JWSACCMaskingClassLoader extends MaskingClassLoader {
private final Collection endorsedPackagesToMask;
JWSACCMaskingClassLoader(ClassLoader parent, Collection endorsedPackagesToMask) {
super(
parent,
Collections.EMPTY_SET /* punchins */,
Collections.EMPTY_SET /* multiples */,
false /* useExplicitCallsToFindSystemClass */);
this.endorsedPackagesToMask = endorsedPackagesToMask;
}
@Override
protected boolean isDottedNameLoadableByParent(final String name) {
/*
* Currently the only masked packages start with javax. or org.
* Check the prefix as an optimization to avoid searching the collection.
*/
if (!(name.startsWith("javax.") || name.startsWith("org."))) {
return true;
}
final String packageName = name.substring(0, name.lastIndexOf("."));
if (endorsedPackagesToMask.contains(packageName)) {
/*
* The requested name is one to be masked, so do not let the caller
* delegate to its parent.
*/
return false;
}
/*
* The requested name should not be masked. Allow the caller to delegate
* to its parent first.
*/
return true;
}
}