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package com.sun.faces.spi;
import javax.faces.context.ExternalContext;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.ObjectInputStream;
import java.io.InputStream;
import java.io.IOException;
import com.sun.faces.RIConstants;
import com.sun.faces.renderkit.ApplicationObjectInputStream;
import com.sun.faces.config.WebConfiguration;
import com.sun.faces.config.WebConfiguration.WebContextInitParameter;
import com.sun.faces.util.Util;
import com.sun.faces.util.FacesLogger;
/**
* <p>A factory for creating <code>SerializationProvider</code>
* instances.</p>
*/
public class SerializationProviderFactory {
/**
* <p>Our default <code>SerializationProvider</code>.</p>
*/
private static final SerializationProvider JAVA_PROVIDER =
new SerializationProviderFactory.JavaSerializationProvider();
/**
* <p>The system property that will be checked for alternate
* <code>SerializationProvider</code> implementations.</p>
*/
private static final String SERIALIZATION_PROVIDER_PROPERTY =
RIConstants.FACES_PREFIX + "SerializationProvider";
private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
/**
* <p>Creates a new instance of the class specified by the
* <code>com.sun.faces.InjectionProvider</code> system property.
* If this propery is not defined, then a default, no-op,
* <code>InjectionProvider</code> will be returned.
* @param extContext the ExternalContext for this application
* @return an implementation of the <code>InjectionProvider</code>
* interfaces
*/
public static SerializationProvider createInstance(ExternalContext extContext) {
String providerClass = findProviderClass(extContext);
SerializationProvider provider = getProviderInstance(providerClass);
if (provider.getClass() != JavaSerializationProvider.class) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE,
"jsf.spi.serialization.provider_configured",
new Object[]{provider.getClass().getName()});
}
}
return provider;
}
private static SerializationProvider getProviderInstance(String className) {
SerializationProvider provider = JAVA_PROVIDER;
if (className != null) {
try {
Class<?> clazz = Util.loadClass(className, SerializationProviderFactory.class);
if (implementsSerializationProvider(clazz)) {
provider = (SerializationProvider) clazz.newInstance();
} else {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
"jsf.spi.serialization.provider_not_implemented",
new Object[]{ className });
}
}
} catch (ClassNotFoundException cnfe) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
"jsf.spi.serialization.provider_not_found",
new Object[]{ className });
}
} catch (InstantiationException ie) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
"jsf.spi.serialization.provider_cannot_instantiate",
new Object[]{className});
LOGGER.log(Level.SEVERE, "", ie);
}
} catch (IllegalAccessException iae) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
"jsf.spi.serialization.provider_cannot_instantiate",
new Object[]{className});
LOGGER.log(Level.SEVERE, "", iae);
}
}
}
return provider;
}
/**
* <p>Determine if the specified class implements the
* <code>SerializationProvider</code> interfaces.</p>
* @param clazz the class in question
* @return <code>true</code> if <code>clazz</code> implements
* the <code>SerializationProvider</code> interface
*/
private static boolean implementsSerializationProvider(Class<?> clazz) {
return SerializationProvider.class.isAssignableFrom(clazz);
}
/**
* Tries to find a provider class in a web context parameter. If not
* present it tries to find it as a System property. If still not found
* returns null.
*
* @param extContext The ExternalContext for this request
* @return The provider class name specified in the container configuration,
* or <code>null</code> if not found.
*/
private static String findProviderClass(ExternalContext extContext) {
WebConfiguration webConfig = WebConfiguration.getInstance(extContext);
String provider = webConfig.getOptionValue(
WebContextInitParameter.SerializationProviderClass);
if (provider != null) {
return provider;
} else {
return System.getProperty(SERIALIZATION_PROVIDER_PROPERTY);
}
}
/**
* <p>An implementation of <code>SerializationProvider</code> which
* uses standard Java serialization.</p>
*/
private static final class JavaSerializationProvider
implements SerializationProvider {
/**
* <p>Creates a new <code>ObjectOutputStream</code> wrapping the
* specified <code>destination</code>.</p>
*
* @param destination the destination of the serialized Object(s)
*
* @return an <code>ObjectOutputStream</code>
*/
public ObjectOutputStream createObjectOutputStream(
OutputStream destination) throws IOException {
return new ObjectOutputStream(destination);
}
/**
* <p>Creates a new <code>ObjectInputStream</code> wrapping the specified
* <code>source</code>.</p>
*
* @param source the source stream from which to read the Object(s)
* from
*
* @return an <code>ObjectInputStream</code>
*/
public ObjectInputStream createObjectInputStream(InputStream source)
throws IOException {
return new ApplicationObjectInputStream(source);
}
}
} // END InjectionProviderFactory