/* ====================================================================
   Copyright 2002-2004   Apache Software Foundation

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */
        

package org.apache.poi.util;

import junit.framework.*;

import java.io.*;

/**
 * Test LongField code
 *
 * @author  Marc Johnson (mjohnson at apache dot org)
 */

public class TestLongField
    extends TestCase
{

    /**
     * Constructor
     *
     * @param name
     */

    public TestLongField(String name)
    {
        super(name);
    }

    static private final long[] _test_array =
    {
        Long.MIN_VALUE, -1L, 0L, 1L, Long.MAX_VALUE
    };

    /**
     * Test constructors.
     */

    public void testConstructors()
    {
        try
        {
            new LongField(-1);
            fail("Should have caught ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        LongField field = new LongField(2);

        assertEquals(0L, field.get());
        try
        {
            new LongField(-1, 1L);
            fail("Should have caught ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        field = new LongField(2, 0x123456789ABCDEF0L);
        assertEquals(0x123456789ABCDEF0L, field.get());
        byte[] array = new byte[ 10 ];

        try
        {
            new LongField(-1, 1L, array);
            fail("Should have caught ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        field = new LongField(2, 0x123456789ABCDEF0L, array);
        assertEquals(0x123456789ABCDEF0L, field.get());
        assertEquals(( byte ) 0xF0, array[ 2 ]);
        assertEquals(( byte ) 0xDE, array[ 3 ]);
        assertEquals(( byte ) 0xBC, array[ 4 ]);
        assertEquals(( byte ) 0x9A, array[ 5 ]);
        assertEquals(( byte ) 0x78, array[ 6 ]);
        assertEquals(( byte ) 0x56, array[ 7 ]);
        assertEquals(( byte ) 0x34, array[ 8 ]);
        assertEquals(( byte ) 0x12, array[ 9 ]);
        array = new byte[ 9 ];
        try
        {
            new LongField(2, 5L, array);
            fail("should have gotten ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        for (int j = 0; j < _test_array.length; j++)
        {
            array = new byte[ 8 ];
            new LongField(0, _test_array[ j ], array);
            assertEquals(_test_array[ j ], new LongField(0, array).get());
        }
    }

    /**
     * Test set() methods
     */

    public void testSet()
    {
        LongField field = new LongField(0);
        byte[]    array = new byte[ 8 ];

        for (int j = 0; j < _test_array.length; j++)
        {
            field.set(_test_array[ j ]);
            assertEquals("testing _1 " + j, _test_array[ j ], field.get());
            field = new LongField(0);
            field.set(_test_array[ j ], array);
            assertEquals("testing _2 ", _test_array[ j ], field.get());
            assertEquals("testing _3.0 " + _test_array[ j ],
                         ( byte ) (_test_array[ j ] % 256), array[ 0 ]);
            assertEquals("testing _3.1 " + _test_array[ j ],
                         ( byte ) ((_test_array[ j ] >> 8) % 256),
                         array[ 1 ]);
            assertEquals("testing _3.2 " + _test_array[ j ],
                         ( byte ) ((_test_array[ j ] >> 16) % 256),
                         array[ 2 ]);
            assertEquals("testing _3.3 " + _test_array[ j ],
                         ( byte ) ((_test_array[ j ] >> 24) % 256),
                         array[ 3 ]);
            assertEquals("testing _3.4 " + _test_array[ j ],
                         ( byte ) ((_test_array[ j ] >> 32) % 256),
                         array[ 4 ]);
            assertEquals("testing _3.5 " + _test_array[ j ],
                         ( byte ) ((_test_array[ j ] >> 40) % 256),
                         array[ 5 ]);
            assertEquals("testing _3.6 " + _test_array[ j ],
                         ( byte ) ((_test_array[ j ] >> 48) % 256),
                         array[ 6 ]);
            assertEquals("testing _3.7 " + _test_array[ j ],
                         ( byte ) ((_test_array[ j ] >> 56) % 256),
                         array[ 7 ]);
        }
    }

    /**
     * Test readFromBytes
     */

    public void testReadFromBytes()
    {
        LongField field = new LongField(1);
        byte[]    array = new byte[ 8 ];

        try
        {
            field.readFromBytes(array);
            fail("should have caught ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        field = new LongField(0);
        for (int j = 0; j < _test_array.length; j++)
        {
            array[ 0 ] = ( byte ) (_test_array[ j ] % 256);
            array[ 1 ] = ( byte ) ((_test_array[ j ] >> 8) % 256);
            array[ 2 ] = ( byte ) ((_test_array[ j ] >> 16) % 256);
            array[ 3 ] = ( byte ) ((_test_array[ j ] >> 24) % 256);
            array[ 4 ] = ( byte ) ((_test_array[ j ] >> 32) % 256);
            array[ 5 ] = ( byte ) ((_test_array[ j ] >> 40) % 256);
            array[ 6 ] = ( byte ) ((_test_array[ j ] >> 48) % 256);
            array[ 7 ] = ( byte ) ((_test_array[ j ] >> 56) % 256);
            field.readFromBytes(array);
            assertEquals("testing " + j, _test_array[ j ], field.get());
        }
    }

    /**
     * Test readFromStream
     *
     * @exception IOException
     */

    public void testReadFromStream()
        throws IOException
    {
        LongField field  = new LongField(0);
        byte[]    buffer = new byte[ _test_array.length * 8 ];

        for (int j = 0; j < _test_array.length; j++)
        {
            buffer[ (j * 8) + 0 ] = ( byte ) (_test_array[ j ] % 256);
            buffer[ (j * 8) + 1 ] = ( byte ) ((_test_array[ j ] >> 8) % 256);
            buffer[ (j * 8) + 2 ] = ( byte ) ((_test_array[ j ] >> 16) % 256);
            buffer[ (j * 8) + 3 ] = ( byte ) ((_test_array[ j ] >> 24) % 256);
            buffer[ (j * 8) + 4 ] = ( byte ) ((_test_array[ j ] >> 32) % 256);
            buffer[ (j * 8) + 5 ] = ( byte ) ((_test_array[ j ] >> 40) % 256);
            buffer[ (j * 8) + 6 ] = ( byte ) ((_test_array[ j ] >> 48) % 256);
            buffer[ (j * 8) + 7 ] = ( byte ) ((_test_array[ j ] >> 56) % 256);
        }
        ByteArrayInputStream stream = new ByteArrayInputStream(buffer);

        for (int j = 0; j < buffer.length / 8; j++)
        {
            field.readFromStream(stream);
            assertEquals("Testing " + j, _test_array[ j ], field.get());
        }
    }

    /**
     * test writeToBytes
     */

    public void testWriteToBytes()
    {
        LongField field = new LongField(0);
        byte[]    array = new byte[ 8 ];

        for (int j = 0; j < _test_array.length; j++)
        {
            field.set(_test_array[ j ]);
            field.writeToBytes(array);
            long val = (( long ) array[ 7 ]) << 56;

            val &= 0xFF00000000000000L;
            val += ((( long ) array[ 6 ]) << 48) & 0x00FF000000000000L;
            val += ((( long ) array[ 5 ]) << 40) & 0x0000FF0000000000L;
            val += ((( long ) array[ 4 ]) << 32) & 0x000000FF00000000L;
            val += ((( long ) array[ 3 ]) << 24) & 0x00000000FF000000L;
            val += ((( long ) array[ 2 ]) << 16) & 0x0000000000FF0000L;
            val += ((( long ) array[ 1 ]) << 8) & 0x000000000000FF00L;
            val += (array[ 0 ] & 0x00000000000000FFL);
            assertEquals("testing ", _test_array[ j ], val);
        }
    }

    /**
     * Main
     *
     * @param args
     */

    public static void main(String [] args)
    {
        System.out.println("Testing util.LongField functionality");
        junit.textui.TestRunner.run(TestLongField.class);
    }
}