/*-------------------------------------------------------------------------
*
* Copyright (c) 2004-2005, PostgreSQL Global Development Group
* Copyright (c) 2004, Open Cloud Limited.
*
* IDENTIFICATION
*        $PostgreSQL: pgjdbc/org/postgresql/core/Utils.java,v 1.4 2005/01/11 08:25:43 jurka Exp $
*
*-------------------------------------------------------------------------
*/

package org.postgresql.core;

/**
 * Collection of utilities used by the protocol-level code.
 */
public class Utils {
    /**
     * Turn a bytearray into a printable form, representing
     * each byte in hex.
     *
     * @param data the bytearray to stringize
     * @return a hex-encoded printable representation of <code>data</code>
     */
    public static String toHexString(byte[] data) {
        StringBuffer sb = new StringBuffer(data.length * 2);
        for (int i = 0; i < data.length; ++i)
        {
            sb.append(Integer.toHexString((data[i] >> 4) & 15));
            sb.append(Integer.toHexString(data[i] & 15));
        }
        return sb.toString();
    }

    /**
     * Encode a string as UTF-8.
     *
     * @param str the string to encode
     * @return the UTF-8 representation of <code>str</code>
     */
    public static byte[] encodeUTF8(String str) {
        // It turns out that under 1.4.2, at least, calling getBytes() is
        // faster than rolling our own converter (it uses direct buffers and, I suspect,
        // a native helper -- and the cost of the encoding lookup is mitigated by a
        // ThreadLocal that caches the last lookup). So we just do things the simple way here.
        try
        {
            return str.getBytes("UTF-8");
        }
        catch (java.io.UnsupportedEncodingException e)
        {
            // Javadoc says that UTF-8 *must* be supported by all JVMs, so we don't try to be clever here.
            throw new RuntimeException("Unexpected exception: UTF-8 charset not supported: " + e);
        }
    }
}