Examples of java.io.FilePermission.newPermissionCollection()

java.io.FilePermission.newPermissionCollection()
Returns a new PermissionCollection object for storing FilePermission objects.
FilePermission objects must be stored in a manner that allows them to be inserted into the collection in any order, but that also enables the PermissionCollection implies method to be implemented in an efficient (and consistent) manner.
For example, if you have two FilePermissions:
1. "/tmp/-", "read"
2. "/tmp/scratch/foo", "write"
and you are calling the implies method with the FilePermission:
```
 "/tmp/scratch/foo", "read,write",  
```
then the implies function must take into account both the "/tmp/-" and "/tmp/scratch/foo" permissions, so the effective permission is "read,write", and implies returns true. The "implies" semantics for FilePermissions are handled properly by the PermissionCollection object returned by this newPermissionCollection method. @return a new PermissionCollection object suitable for storing FilePermissions.


    public static boolean isSecure(String root, File file) throws IOException {
        PermissionCollection rootDirectory;
        if( root.endsWith( File.separator ) ) {
            FilePermission fp = new FilePermission( root + "-", "read" );
            rootDirectory = fp.newPermissionCollection();
            rootDirectory.add( fp );
            rootDirectory.add( new FilePermission( root.substring( 0, root.length() - 1 ), "read" ) );
        } else {
            FilePermission fp = new FilePermission( root, "read" );
            rootDirectory = fp.newPermissionCollection();

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            rootDirectory = fp.newPermissionCollection();
            rootDirectory.add( fp );
            rootDirectory.add( new FilePermission( root.substring( 0, root.length() - 1 ), "read" ) );
        } else {
            FilePermission fp = new FilePermission( root, "read" );
            rootDirectory = fp.newPermissionCollection();
            rootDirectory.add( fp );
            rootDirectory.add( new FilePermission( root + File.separator + "-", "read" ) );
        }
        return ( rootDirectory.implies( new FilePermission( file.getCanonicalPath(), "read" ) ) );
    }

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    assertTrue("returned true for non subset of file and action", collect
        .implies(readInFile));


    FilePermission fp1 = new FilePermission("/tmp/-".replace('/',
        File.separatorChar), "read");
    PermissionCollection fpc = fp1.newPermissionCollection();
    fpc.add(fp1);
    fpc.add(new FilePermission("/tmp/scratch/foo/*".replace('/',
        File.separatorChar), "write"));
    FilePermission fp2 = new FilePermission("/tmp/scratch/foo/file"
        .replace('/', File.separatorChar), "read,write");

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        assertTrue("returned true for non subset of file and action", collect
                .implies(readInFile));


        FilePermission fp1 = new FilePermission("/tmp/-".replace('/',
                File.separatorChar), "read");
        PermissionCollection fpc = fp1.newPermissionCollection();
        fpc.add(fp1);
        fpc.add(new FilePermission("/tmp/scratch/foo/*".replace('/',
                File.separatorChar), "write"));
        FilePermission fp2 = new FilePermission("/tmp/scratch/foo/file"
                .replace('/', File.separatorChar), "read,write");

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    assertTrue("returned true for non subset of file and action", collect
        .implies(readInFile));


    FilePermission fp1 = new FilePermission("/tmp/-".replace('/',
        File.separatorChar), "read");
    PermissionCollection fpc = fp1.newPermissionCollection();
    fpc.add(fp1);
    fpc.add(new FilePermission("/tmp/scratch/foo/*".replace('/',
        File.separatorChar), "write"));
    FilePermission fp2 = new FilePermission("/tmp/scratch/foo/file"
        .replace('/', File.separatorChar), "read,write");

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    }


    static void tryFilePC() throws Exception {
        try {
            FilePermission p0 = new FilePermission("/home/foobar","read");
            PermissionCollection pc = p0.newPermissionCollection();
            pc.setReadOnly();   // this should lock out future adds
            //
            FilePermission p1 = new FilePermission("/home/quux","read");
            pc.add(p1);
            throw new

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        assertTrue("Should not return false for non subset of file and action", collect
                .implies(readInFile));


        FilePermission fp1 = new FilePermission("/tmp/-".replace('/',
                File.separatorChar), "read");
        PermissionCollection fpc = fp1.newPermissionCollection();
        fpc.add(fp1);
        fpc.add(new FilePermission("/tmp/scratch/foo/*".replace('/',
                File.separatorChar), "write"));
        FilePermission fp2 = new FilePermission("/tmp/scratch/foo/file"
                .replace('/', File.separatorChar), "read,write");

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