bytesdatatype.java

采用 Java 编写的数据库系统单元测试程序。

/*
 *
 * The DbUnit Database Testing Framework
 * Copyright (C)2002-2004, DbUnit.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

package org.dbunit.dataset.datatype;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.dbunit.dataset.ITable;
import org.dbunit.util.Base64;

import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.sql.Blob;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * @author Manuel Laflamme
 * @version $Revision: 629 $
 * @since Mar 20, 2002
 */
public class BytesDataType extends AbstractDataType
{

    /**
     * Logger for this class
     */
    private static final Logger logger = LoggerFactory.getLogger(BytesDataType.class);

    private static final int MAX_URI_LENGTH = 256;

    BytesDataType(String name, int sqlType)
    {
        super(name, sqlType, byte[].class, false);
    }

    private byte[] toByteArray(InputStream in, int length) throws IOException
    {
        logger.debug("toByteArray(in=" + in + ", length=" + length + ") - start");

        ByteArrayOutputStream out = new ByteArrayOutputStream(length);
        in = new BufferedInputStream(in);
        int i = in.read();
        while (i != -1)
        {
            out.write(i);
            i = in.read();
        }
        return out.toByteArray();
    }

    ////////////////////////////////////////////////////////////////////////////
    // DataType class

    public Object typeCast(Object value) throws TypeCastException
    {
        logger.debug("typeCast(value=" + value + ") - start");

        if (value == null || value == ITable.NO_VALUE)
        {
            return null;
        }

        if (value instanceof byte[])
        {
            return value;
        }

        if (value instanceof String)
        {
            String stringValue = (String)value;

            // Assume not an uri if length greater than max uri length
            if (stringValue.length() == 0 || stringValue.length() > MAX_URI_LENGTH)
            {
                return Base64.decode((String)value);
            }

            try
            {
                try
                {
                    // Try value as URL
                    URL url = new URL(stringValue);
                    return toByteArray(url.openStream(), 0);
                }
                catch (MalformedURLException e1)
                {
                    logger.error("typeCast()", e1);

                    try
                    {
                        // Not an URL, try as file name
                        File file = new File(stringValue);
                        return toByteArray(new FileInputStream(file),
                                (int)file.length());
                    }
                    catch (FileNotFoundException e2)
                    {
                        logger.error("typeCast()", e2);

                        // Not a file name either
                        return Base64.decode((String)value);
                    }
                }
            }
            catch (IOException e)
            {
                throw new TypeCastException(value, this, e);
            }
        }

        if (value instanceof Blob)
        {
            try
            {
                Blob blobValue = (Blob)value;
                return blobValue.getBytes(1, (int)blobValue.length());
            }
            catch (SQLException e)
            {
                throw new TypeCastException(value, this, e);
            }
        }

        if (value instanceof URL)
        {
            try
            {
                return toByteArray(((URL)value).openStream(), 0);
            }
            catch (IOException e)
            {
                throw new TypeCastException(value, this, e);
            }
        }

        if (value instanceof File)
        {
            try
            {
                File file = (File)value;
                return toByteArray(new FileInputStream(file),
                        (int)file.length());
            }
            catch (IOException e)
            {
                throw new TypeCastException(value, this, e);
            }
        }

        throw new TypeCastException(value, this);
    }

    public int compare(Object o1, Object o2) throws TypeCastException
    {
        logger.debug("compare(o1=" + o1 + ", o2=" + o2 + ") - start");

        try
        {
            byte[] value1 = (byte[])typeCast(o1);
            byte[] value2 = (byte[])typeCast(o2);

            if (value1 == null && value2 == null)
            {
                return 0;
            }

            if (value1 == null && value2 != null)
            {
                return -1;
            }

            if (value1 != null && value2 == null)
            {
                return 1;
            }

            return compare(value1, value2);
        }
        catch (ClassCastException e)
        {
            throw new TypeCastException(e);
        }
    }

    public int compare(byte[] v1, byte[] v2) throws TypeCastException
    {
        logger.debug("compare(v1=" + v1 + ", v2=" + v2 + ") - start");

        int len1 = v1.length;
        int len2 = v2.length;
        int n = Math.min(len1, len2);
        int i = 0;
        int j = 0;

        if (i == j)
        {
            int k = i;
            int lim = n + i;
            while (k < lim)
            {
                byte c1 = v1[k];
                byte c2 = v2[k];
                if (c1 != c2)
                {
                    return c1 - c2;
                }
                k++;
            }
        }
        else
        {
            while (n-- != 0)
            {
                byte c1 = v1[i++];
                byte c2 = v2[j++];
                if (c1 != c2)
                {
                    return c1 - c2;
                }
            }
        }
        return len1 - len2;
    }

    public Object getSqlValue(int column, ResultSet resultSet)
            throws SQLException, TypeCastException
    {
        logger.debug("getSqlValue(column=" + column + ", resultSet=" + resultSet + ") - start");

        byte[] value = resultSet.getBytes(column);
        if (value == null || resultSet.wasNull())
        {
            return null;
        }
        return value;
    }

    public void setSqlValue(Object value, int column, PreparedStatement statement)
            throws SQLException, TypeCastException
    {
        logger.debug("setSqlValue(value=" + value + ", column=" + column + ", statement=" + statement + ") - start");

        super.setSqlValue(value, column, statement);
    }

}