/**
* Copyright Alex Objelean
*/
package ro.isdc.wro.extensions.model.factory;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Type;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ro.isdc.wro.WroRuntimeException;
import ro.isdc.wro.model.WroModel;
import ro.isdc.wro.model.factory.AbstractWroModelFactory;
import ro.isdc.wro.util.StopWatch;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
/**
* TODO: validate duplicate groups & null resource type
* <p/>
* Creates {@link WroModel} from a json.
* <p/>
* This class is thread-safe because it doesn't have any state..
*
* @author Alex Objelean
* @created 13 Mar 2011
* @since 1.3.6
*/
public class JsonModelFactory
extends AbstractWroModelFactory {
private static final Logger LOG = LoggerFactory.getLogger(JsonModelFactory.class);
/**
* Default name of the file used to retrieve the model.
*/
private static final String DEFAULT_FILE_NAME = "wro.json";
/**
* Alias for this model factory used by provider.
*/
public static final String ALIAS = "json";
/**
* {@inheritDoc}
*/
@Override
public synchronized WroModel create() {
final StopWatch stopWatch = new StopWatch("Create Wro Model from Groovy");
try {
stopWatch.start("createModel");
final Type type = new TypeToken<WroModel>() {}.getType();
final InputStream is = getModelResourceAsStream();
if (is == null) {
throw new WroRuntimeException("Invalid model stream provided!");
}
final WroModel model = new Gson().fromJson(new InputStreamReader(getModelResourceAsStream()), type);
LOG.debug("json model: {}", model);
if (model == null) {
throw new WroRuntimeException("Invalid content provided, cannot build model!");
}
return model;
} catch (final Exception e) {
throw new WroRuntimeException("Invalid model found!", e);
} finally {
stopWatch.stop();
LOG.debug(stopWatch.prettyPrint());
}
}
/**
* {@inheritDoc}
*/
@Override
protected String getDefaultModelFilename() {
return DEFAULT_FILE_NAME;
}
}