package org.codehaus.plexus.util.xml;

/*
 * Copyright The Codehaus 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.
 */

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import junit.framework.TestCase;

public class XmlStreamWriterTest
    extends TestCase
{
    /** french */
    private static final String TEXT_LATIN1 = "eacute: \u00E9";

    /** greek */
    private static final String TEXT_LATIN7 = "alpha: \u03B1";

    /** euro support */
    private static final String TEXT_LATIN15 = "euro: \u20AC";

    /** japanese */
    private static final String TEXT_EUC_JP = "hiragana A: \u3042";

    /** Unicode: support everything */
    private static final String TEXT_UNICODE =
        TEXT_LATIN1 + ", " + TEXT_LATIN7 + ", " + TEXT_LATIN15 + ", " + TEXT_EUC_JP;

    private static String createXmlContent( String text, String encoding )
    {
        String xmlDecl = "<?xml version=\"1.0\"?>";
        if ( encoding != null )
        {
            xmlDecl = "<?xml version=\"1.0\" encoding=\"" + encoding + "\"?>";
        }
        String xml = xmlDecl + "\n<text>" + text + "</text>";
        return xml;
    }

    private static void checkXmlContent( String xml, String encoding )
        throws IOException
    {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        XmlStreamWriter writer = new XmlStreamWriter( out );
        writer.write( xml );
        writer.close();
        byte[] xmlContent = out.toByteArray();
        String result = new String( xmlContent, encoding );
        assertEquals( xml, result );
    }

    private static void checkXmlWriter( String text, String encoding )
        throws IOException
    {
        String xml = createXmlContent( text, encoding );
        String effectiveEncoding = ( encoding == null ) ? "UTF-8" : encoding;
        checkXmlContent( xml, effectiveEncoding );
    }

    public void testNoXmlHeader()
        throws IOException
    {
        String xml = "<text>text with no XML header</text>";
        checkXmlContent( xml, "UTF-8" );
    }

    public void testEmpty()
        throws IOException
    {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        XmlStreamWriter writer = new XmlStreamWriter( out );
        writer.flush();
        writer.write( "" );
        writer.flush();
        writer.write( "." );
        writer.flush();
        writer.close();
    }

    public void testDefaultEncoding()
        throws IOException
    {
        checkXmlWriter( TEXT_UNICODE, null );
    }

    public void testUTF8Encoding()
        throws IOException
    {
        checkXmlWriter( TEXT_UNICODE, "UTF-8" );
    }

    public void testUTF16Encoding()
        throws IOException
    {
        checkXmlWriter( TEXT_UNICODE, "UTF-16" );
    }

    public void testUTF16BEEncoding()
        throws IOException
    {
        checkXmlWriter( TEXT_UNICODE, "UTF-16BE" );
    }

    public void testUTF16LEEncoding()
        throws IOException
    {
        checkXmlWriter( TEXT_UNICODE, "UTF-16LE" );
    }

    public void testLatin1Encoding()
        throws IOException
    {
        checkXmlWriter( TEXT_LATIN1, "ISO-8859-1" );
    }

    public void testLatin7Encoding()
        throws IOException
    {
        checkXmlWriter( TEXT_LATIN7, "ISO-8859-7" );
    }

    public void testLatin15Encoding()
        throws IOException
    {
        checkXmlWriter( TEXT_LATIN15, "ISO-8859-15" );
    }

    public void testEUC_JPEncoding()
        throws IOException
    {
        checkXmlWriter( TEXT_EUC_JP, "EUC-JP" );
    }

    public void testEBCDICEncoding()
        throws IOException
    {
        checkXmlWriter( "simple text in EBCDIC", "CP1047" );
    }
}
