no-root

Created by dsosnoski. Last edited by dsosnoski, one year and 27 days ago. Viewed 1,011 times. #1

I am working with xml files that do not have a root element. Basically I have files that look like the following:
<data> <something></something> </data> <data> <something></something> </data> <data> <something></something> </data>

I've been trying to unmarshall all the <data> objects from this type of file but have not figured out how to do it. Is it possibly to unmarshall a file like this? The unmarshallDocument(reader) method successfully returns the first <data> object within the file. How can I get the rest of the <data> objects?

The solution I've come up with is to subclass Reader to patch my invalid xml files. I create a mapping for <data_list> (even though my files only contain <data> elements) and when unmarshalling I pass an instance of the following DataReader class to unmarshallDocument().

import java.io.Reader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.StringReader;public class DataReader extends Reader {
    private final StringReader START_READER = new StringReader("<data_list>");
    private final StringReader END_READER = new StringReader("</data_list>");
    private InputStreamReader isr;
    public TrackingDataReader(InputStreamReader isr) {
        this.isr = isr;
    }
    public int read(char[] cbuf, int off, int len) throws IOException {
        int retval = START_READER.read(cbuf, off, len);
        if (retval == -1) {
            retval = isr.read(cbuf, off, len);
        }
        if (retval == -1) {
            retval = END_READER.read(cbuf, off, len);
        }
        return retval;
    }
    public void close() throws IOException {
    }
}

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