Examples of org.teiid.core.id.UUID

org.teiid.core.id.UUID

This class represents a universally unique identifier, consisting of two long integral values.

This identifier is supposed to be unique both spatially and temporally. It is based on version 4 IETF variant random UUIDs.


    /**
     * Test UUID generation for IDs generated from powers of 2.
     */
    private static void helpTestGenPowers( int nGen ) {
        UUID uuid = null;


        // First test some fairly "regular" numbers...
        for ( int j = 0; j < Math.min(nGen,63); j++ ) {
            long v1 = 1L << j;
            long v2 = (1L << j)/2;
            uuid = new UUID(v1,v2);
            checkStringToObject(uuid);  // Test case may fail here
        }
    }

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    /**
     * Test UUID generation for IDs generated randomly.
     */
    private static void helpTestGenRandom( int nGen ) {
        UUID uuid = null;


        // Then test some random numbers...
        java.util.Random rng = new java.util.Random();
        for ( int k = 0; k < nGen; k++ ) {
            long v1 = rng.nextLong();
            long v2 = rng.nextLong();
            uuid = new UUID(v1,v2);
            checkStringToObject(uuid);  // Test case may fail here
        }
    }

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    /**
     * Test for duplicates when generating a bunch of IDs.
     */
    private static void helpTestDuplicates( int nGen ) {
        UUID uuid = null;
        Set uuids = new HashSet();
//        Set duplicates = new HashSet();


        // First test some fairly "regular" numbers...
        for ( int j = 0; j < Math.min(nGen,63); j++ ) {
            long v1 = 1L << j;
            long v2 = (1L << j)/2;
            uuid = new UUID(v1,v2);
            assertTrue( "UUID '" + uuid + "' is a duplicate!", !uuids.contains(uuid) ); //$NON-NLS-1$ //$NON-NLS-2$
            uuids.add(uuid);
        }


        // Then test some random numbers...
        java.util.Random rng = new java.util.Random();
        for ( int k = 0; k < nGen; k++ ) {
            long v1 = rng.nextLong();
            long v2 = rng.nextLong();
            uuid = new UUID(v1,v2);
            if ( uuids.contains(uuid) ) {
                fail( "UUID '" + uuid + "' is a duplicate!" ); //$NON-NLS-1$ //$NON-NLS-2$
            }
            uuids.add(uuid);
        }

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     * @param id1 The ID to test
     */
    public static void checkStringToObject( UUID id1 ) {
        String uuidString = id1.exportableForm();


        UUID id2 = null;
        try {
            id2 = (UUID)UUID.stringToObject( uuidString );
        } catch ( InvalidIDException e ) {
            fail( "Could not convert UUID exportable form '" + uuidString + "' to UUID: " //$NON-NLS-1$ //$NON-NLS-2$
                + e.getMessage() );

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Related Classes of org.teiid.core.id.UUID

org.teiid.core.id.TestUUID

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