Re: Wrong encoding after XML identity transformation

[Nico R.]

Hello again!

A few hours ago, I wrote:
[…]
> 
> I’m attaching my test code, which I hope is correct and readable.

It seems that the list software stripped off the attachment with the
test program, so here it is again, inline: :-/




// This document is encoded in UTF-8, with no BOM and with LF line endings.

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Text;

public class TransformerTest {

    /** convenience method, prints a byte array in human-readable ASCII
chars */
    private static void printArray(byte[] data, PrintStream out) {
        if (data == null) {
            out.println("(null)");
            return;
        }

        if (data.length == 0) {
            out.println("(empty array)");
            return;
        }

        for (int i = 0; ; ) {
            byte b = data[i];
            if (b >= 0x20 && b <= 0x7F) {
                out.print(" '" + (char)b + "'");
            } else {
                out.format("0x%02X", (int)b & 0xFF);
            }

            if (++i == data.length) break;

            if ((i % 16) == 0) {
                out.println(',');
            } else {
                out.print(", ");
            }
        }
        out.println();
    }

    /**
     * parses a {@code Document} from an {@code InputStream} (and not from a
     * {@code StringReader}, in order to make sure it’s not a problem when
     * parsing internal Unicode {@code String}s)
     */
    private static Document makeDocument() throws Exception {
        DocumentBuilder builder =
                DocumentBuilderFactory.newInstance().newDocumentBuilder();

        byte[] docBytes = {
            '<', '?', 'x', 'm', 'l', ' ',

            'v', 'e', 'r', 's', 'i', 'o', 'n', '=',
            '"', '1', '.', '0', '"', ' ',

        // document is encoded in US-ASCII, but labelled as a superset
            'e', 'n', 'c', 'o', 'd', 'i', 'n', 'g', '=',
            '"', 'I', 'S', 'O', '-', '8', '8', '5', '9', '-', '1', '"',

            '?', '>',

            '<', 'x', '/', '>'
        };

        return builder.parse(new ByteArrayInputStream(docBytes));
    }

    /** prepares a list of transformer factories to test */
    private static List<TransformerFactory> makeTransformerFactories() {
        String[] facNames = {
            "org.apache.xalan.processor.TransformerFactoryImpl",
            "org.apache.xalan.xsltc.trax.TransformerFactoryImpl",

"com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl"
        };

        List<TransformerFactory> transFactories = new ArrayList<>();

        for (String facName : facNames) {
            try {
                TransformerFactory factory =
                        TransformerFactory.newInstance(facName, null);
                transFactories.add(factory);
            } catch (TransformerFactoryConfigurationError ex) {
                System.out.println("cannot build instance of " + facName);
            }
        }

        //transFactories.add(TransformerFactory.newInstance());  //
default impl

        return transFactories;
    }

    private static byte[] transformWith(TransformerFactory transFac,
Document doc) throws Exception {
        Transformer trans = transFac.newTransformer();
        trans.setOutputProperty(OutputKeys.METHOD, "xml");
        trans.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        System.out.println("transformer factory: " +
transFac.getClass().getName());
        System.out.println("transformer: " + trans.getClass().getName());

        ByteArrayOutputStream bout = new ByteArrayOutputStream(128);

        trans.transform(new DOMSource(doc), new StreamResult(bout));

        byte[] data = bout.toByteArray();

        return data;
    }

    public static void main(String[] t) throws Exception {
        Document doc = makeDocument();

        System.out.println(
                "encoding declared in document : " +
                    doc.getXmlEncoding());


        // now insert a text node containing a character which can be
        // represented in ISO-8859-1, as well as (differently) in UTF-8,
but not
        // in US-ASCII

        Element dstRoot = doc.getDocumentElement();
        Text text = doc.createTextNode("schön");
        dstRoot.insertBefore(text, null);
        System.out.println("root element text: " +
dstRoot.getTextContent());


        List<TransformerFactory> factories = makeTransformerFactories();
        for (TransformerFactory factory : factories) {
            System.out.println();
            byte[] bytes = transformWith(factory, doc);

            System.out.println("resulting bytes:");
            printArray(bytes, System.out);
        }
    }

}




-- 
Nico