/*
 * (c) Copyright 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package migrate.lib;

import java.nio.ByteBuffer ;

import org.junit.Test ;
import org.openjena.atlas.junit.BaseTest ;
import org.openjena.atlas.lib.ByteBufferLib ;

public class TestVarInteger extends BaseTest
{
    @Test public void varint_01()
    {
        VarInteger vint = VarInteger.valueOf(0) ;
        assertEquals(1, vint.length()) ;
        assertEquals((byte)0, vint.bytes()[0]) ;
        assertEquals(0L, vint.value()) ;
    }
    
    @Test public void varint_02()
    {
        VarInteger vint = VarInteger.valueOf(1) ;
        assertEquals(1, vint.length()) ;
        assertEquals((byte)1, vint.bytes()[0]) ;
        assertEquals(1L, vint.value()) ;
    }
    
    @Test public void varint_03()
    {
        VarInteger vint = VarInteger.valueOf(127) ;
        assertEquals(1, vint.length()) ;
        assertEquals((byte)0x7F, vint.bytes()[0]) ;
        assertEquals(127L, vint.value()) ;
    }

    @Test public void varint_04()
    {
        VarInteger vint = VarInteger.valueOf(128) ;
        assertEquals(2, vint.length()) ;
        assertEquals((byte)0x80, vint.bytes()[0]) ;
        assertEquals((byte)0x01, vint.bytes()[1]) ;
        assertEquals(128L, vint.value()) ;
    }

    @Test public void varint_05()
    {
        VarInteger vint = VarInteger.valueOf(129) ;
        assertEquals(2, vint.length()) ;
        assertEquals((byte)0x81, vint.bytes()[0]) ;
        assertEquals((byte)0x01, vint.bytes()[1]) ;
        assertEquals(129L, vint.value()) ;
    }

    @Test public void varint_10()
    {
        VarInteger vint = VarInteger.valueOf(1L<<45) ;
        //assertEquals(2, vint.length()) ;
        assertEquals(1L<<45, vint.value()) ;
    }
    
    // General hammering.
    @Test public void varint_N()
    {
        for ( long x = 0 ; x < (1L<<17) ; x++ )
        {
            VarInteger vint = VarInteger.valueOf(x) ;
            assertEquals(x, vint.value()) ;
        }
    }
    
    @Test public void varint_eq_1()
    {
        VarInteger x = VarInteger.valueOf(0) ;
        VarInteger x0 = VarInteger.valueOf(0) ;
        VarInteger x1 = VarInteger.valueOf(1) ;
        assertEquals(x.hashCode(), x0.hashCode()) ;
        assertNotEquals(x.hashCode(), x1.hashCode()) ;
        assertEquals(x, x0) ;
        assertNotEquals(x, x1) ;
    }
    
    @Test public void varint_eq_2()
    {
        VarInteger x = VarInteger.valueOf(1) ;
        VarInteger x0 = VarInteger.valueOf(0) ;
        VarInteger x1 = VarInteger.valueOf(1) ;
        assertEquals(x.hashCode(), x1.hashCode()) ;
        assertNotEquals(x.hashCode(), x0.hashCode()) ;
        assertEquals(x, x1) ;
        assertNotEquals(x, x0) ;
    }

    private static void eq(long value)
    {
        VarInteger x0 = VarInteger.valueOf(value) ;
        VarInteger x1 = VarInteger.valueOf(value) ;
        assertEquals(x0.hashCode(), x1.hashCode()) ;
        assertEquals(x0, x1) ;
    }
    
    @Test public void varint_eq_3()     { eq(127) ; }
    @Test public void varint_eq_4()     { eq(128) ; }
    @Test public void varint_eq_5()     { eq(129) ; }
    
    @Test public void varint_bb_1()
    {
        ByteBuffer bb = ByteBuffer.allocate(8) ;
        ByteBufferLib.fill(bb, (byte)0) ;
        VarInteger.encode(bb, 1, 2L<<14) ;
        assertEquals(0, bb.get(0)) ;
    }

    @Test public void varint_extract_1()
    {
        VarInteger x0 = VarInteger.valueOf(113) ;
        VarInteger x1 = VarInteger.make(x0.bytes) ;
        assertEquals(x0, x1) ;
    }

    @Test public void varint_extract_2()
    {
        VarInteger x0 = VarInteger.valueOf(113) ;
        ByteBuffer bb = ByteBuffer.wrap(x0.bytes()) ;
        VarInteger x1 = VarInteger.make(bb,0) ;
        assertEquals(x0, x1) ;
    }
    
    @Test public void varint_extract_3()
    {
        VarInteger x0 = VarInteger.valueOf(11377) ;
        ByteBuffer bb = ByteBuffer.wrap(x0.bytes()) ;
        VarInteger x1 = VarInteger.make(bb,0) ;
        assertEquals(x0, x1) ;
    }
    
    @Test public void varint_length_1()
    {
        assertEquals(1, VarInteger.lengthOf(0)) ;
        assertEquals(1, VarInteger.lengthOf(1)) ;
        assertEquals(1, VarInteger.lengthOf(127)) ;
        assertEquals(2, VarInteger.lengthOf(128)) ;
        assertEquals(2, VarInteger.lengthOf(1L<<14-1)) ;
        assertEquals(3, VarInteger.lengthOf(1L<<14)) ;
        assertEquals(8, VarInteger.lengthOf(1L<<56-1)) ;
    }
}

/*
 * (c) Copyright 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */