Examples of java.security.Policy$UnsupportedEmptyCollection

java.security.Policy
This class represents a read-only empty PermissionCollection object that is returned from the getPermissions(CodeSource) and getPermissions(ProtectionDomain) methods in the Policy class when those operations are not supported by the Policy implementation.


        // Setup the PermissionCollection for this web app context
        // based on the permissions configured for the root of the
        // web app context directory, then add a file read permission
        // for that directory.
        Policy policy = Policy.getPolicy();
        if( policy != null ) {
            try {          
                // Get the permissions for the web app context
                String docBase = context.getRealPath("/");
                if( docBase == null ) {
                    docBase = options.getScratchDir().toString();
                }
                String codeBase = docBase;
                if (!codeBase.endsWith(File.separator)){
                    codeBase = codeBase + File.separator;
                }
                File contextDir = new File(codeBase);
                URL url = contextDir.getCanonicalFile().toURL();
                codeSource = new CodeSource(url,(Certificate[])null);
                permissionCollection = policy.getPermissions(codeSource);


                // Create a file read permission for web app context directory
                if (!docBase.endsWith(File.separator)){
                    permissionCollection.add
                        (new FilePermission(docBase,"read"));

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            }


            final URL sourceUrl = jar.getResource(name.replace('.', '/')
                + ".class");
            final CodeSource cs = new CodeSource(sourceUrl, (Certificate[]) null);
            final Policy policy = (Policy) AccessController
                .doPrivileged(GetPolicyAction.getInstance());
            final ProtectionDomain pd = new ProtectionDomain(cs, policy
                .getPermissions(cs));
            final Class<?> cls = defineClass(name, b, pd);
            resolveClass(cls);
            return cls;
        } else {

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         IllegalStateException ex = new IllegalStateException("Failed to parse jacc-policy-config-states.xml");
         ex.initCause(e);
         throw ex;
      }
      // Get the DelegatingPolicy
      Policy p = Policy.getPolicy();
      if( (p instanceof DelegatingPolicy) == false )
      {
         // Assume that the installed policy delegates to the DelegatingPolicy
         p = DelegatingPolicy.getInstance();
      }

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  PermissionCollection perms = (PermissionCollection)
      AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
        CodeSource codesource =
      new CodeSource(null, (Certificate[]) null);
        Policy p = java.security.Policy.getPolicy();
        if (p != null) {
      return p.getPermissions(codesource);
        } else {
      return new Permissions();
        }
    }
      });

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        String policyProvider = System.getProperty("javax.security.jacc.policy.provider", JaccProvider.Policy.class.getName());
        try {
            ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
            Class policyClass = Class.forName(policyProvider, true, classLoader);
            Policy policy = (Policy) policyClass.newInstance();
            policy.refresh();
            Policy.setPolicy(policy);
        } catch (Exception e) {
            throw new IllegalStateException("Could not install JACC Policy Provider: "+policyProvider, e);
        }
    }

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            new AggregatePolicyProvider(initialGlobalPolicy);
        Policy.setPolicy(globalPolicy);
              logger.log(Level.FINEST, 
            "Global policy set: {0}", globalPolicy);
          }
    Policy service_policy = 
        getServicePolicyProvider(
            new PolicyFileProvider(desc.policy));
    Policy backstop_policy = 
        getServicePolicyProvider(initialGlobalPolicy);
                LoaderSplitPolicyProvider split_service_policy = 
                    new LoaderSplitPolicyProvider(
                        cl, service_policy, backstop_policy);
    /* Grant "this" code enough permission to do its work

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            return path.toString();
        }
    }
    
    static Policy getServicePolicyProvider(Policy service_policy) throws Exception {
        Policy servicePolicyWrapper = null;
        if (servicePolicyProvider != null) {
       Class sp = Class.forName(servicePolicyProvider);
      logger.log(Level.FINEST, 
          "Obtained custom service policy implementation class: {0}", sp);
      Constructor constructor =

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        try {
            // The policy file may have been modified to adjust
            // permissions, so we're reloading it when loading or
            // reloading a Context
            Policy policy = Policy.getPolicy();
            policy.refresh();
        } catch (AccessControlException e) {
            // Some policy files may restrict this, even for the core,
            // so this exception is ignored
        }

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        PermissionCollection perms = (PermissionCollection)
                AccessController.doPrivileged(new PrivilegedAction() {
                    public Object run() {
                        CodeSource cs =
                                new CodeSource(null, (Certificate []) null);
                        Policy policy = Policy.getPolicy();


                        if (policy != null) {
                            return policy.getPermissions(cs);
                        }
                        return new Permissions();
                    }
                });

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                return testImpl();
            } else {
                // Emulate calling from restricted code. We create a 
                // calling context with only the permission to read
                // the file.
                Policy policy = Policy.getPolicy();
                URL classesURL = (new File("classes")).toURL();
                CodeSource cs = new CodeSource(classesURL, null);
                PermissionCollection permissionsOrig
                    = policy.getPermissions(cs);
                Permissions permissions = new Permissions();
                Enumeration iter = permissionsOrig.elements();
                while (iter.hasMoreElements()) {
                    Permission p = (Permission)iter.nextElement();
                    if (!(p instanceof RuntimePermission)) {

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