package org.postgresql.test.jdbc2;

import junit.framework.*;
import org.postgresql.core.Encoding;
import java.io.*;

/**
 * Tests for the Encoding class.
 *
 * $Id$
 */


public class EncodingTest extends TestCase {

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

    public void testCreation() throws Exception {
	Encoding encoding;
	encoding = Encoding.getEncoding("UNICODE", null);
	assertEquals("UTF", encoding.name().substring(0, 3).toUpperCase());
	encoding = Encoding.getEncoding("SQL_ASCII", null);
	assert(encoding.name().toUpperCase().indexOf("ASCII") != -1);
	assertEquals("When encoding is unknown the default encoding should be used",
		     Encoding.defaultEncoding(),
		     Encoding.getEncoding("UNKNOWN", null));
	encoding = Encoding.getEncoding("SQL_ASCII", "utf-8");
	assert("Encoding passed in by the user should be preferred",
	       encoding.name().toUpperCase().indexOf("UTF") != -1);
    }

    public void testTransformations() throws Exception {
	Encoding encoding = Encoding.getEncoding("UNICODE", null);
	assertEquals("ab", encoding.decode(new byte[] { 97, 98 }));

	assertEquals(2, encoding.encode("ab").length);
	assertEquals(97, encoding.encode("a")[0]);
	assertEquals(98, encoding.encode("b")[0]);

	encoding = Encoding.defaultEncoding();
	assertEquals("a".getBytes()[0], encoding.encode("a")[0]);
	assertEquals(new String(new byte[] { 97 }),
		     encoding.decode(new byte[] { 97 }));
    }

    public void testReader() throws Exception {
	Encoding encoding = Encoding.getEncoding("SQL_ASCII", null);
	InputStream stream = new ByteArrayInputStream(new byte[] { 97, 98 });
	Reader reader = encoding.getDecodingReader(stream);
	assertEquals(97, reader.read());
	assertEquals(98, reader.read());
	assertEquals(-1, reader.read());
    }
}