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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("jakarta.") || 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; } }





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