cayenne-server/src/main/java/org/apache/cayenne/configuration/XMLDataMapLoader.java

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package org.apache.cayenne.configuration;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.map.DataMap;
import org.apache.cayenne.map.MapLoader;
import org.apache.cayenne.resource.Resource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xml.sax.InputSource;

/**
 * @since 3.1
 */
public class XMLDataMapLoader implements DataMapLoader {

    private static Log logger = LogFactory.getLog(XMLDataMapLoader.class);

    public DataMap load(Resource configurationResource) throws CayenneRuntimeException {

        // TODO: andrus 11.27.2009 - deprecate MapLoader and implement a loader
        // here. MapLoader is in the wrong place, exposes ContentHandler methods and
        // implements if/else contextless matching of tags... should use something like
        // SAXNestedTagHandler instead.
        MapLoader mapLoader = new MapLoader();
        URL url = configurationResource.getURL();

        InputStream in = null;

        DataMap map;

        try {
            in = url.openStream();

            map = mapLoader.loadDataMap(new InputSource(in));
        }
        catch (Exception e) {
            throw new CayenneRuntimeException(
                    "Error loading configuration from %s",
                    e,
                    url);
        }
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            }
            catch (IOException ioex) {
                logger.info(
                        "failure closing input stream for " + url + ", ignoring",
                        ioex);
            }
        }

        return map;
    }
}