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package org.glassfish.grizzly.filterchain;
import java.io.IOException;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.TransformationException;
import org.glassfish.grizzly.TransformationResult;
import org.glassfish.grizzly.Transformer;
/**
*
* @author Alexey Stashok
*/
public abstract class AbstractCodecFilter<K, L> extends BaseFilter
implements CodecFilter<K, L> {
private final Transformer<K, L> decoder;
private final Transformer<L, K> encoder;
public AbstractCodecFilter(Transformer<K, L> decoder,
Transformer<L, K> encoder) {
this.decoder = decoder;
this.encoder = encoder;
}
@Override
@SuppressWarnings("unchecked")
public NextAction handleRead(FilterChainContext ctx) throws IOException {
final Connection connection = ctx.getConnection();
final K message = (K) ctx.getMessage();
final TransformationResult<K, L> result =
decoder.transform(connection, message);
switch(result.getStatus()) {
case COMPLETE:
final K remainder = result.getExternalRemainder();
final boolean hasRemaining =
decoder.hasInputRemaining(connection, remainder);
decoder.release(connection);
ctx.setMessage(result.getMessage());
if (hasRemaining) {
return ctx.getInvokeAction(remainder);
} else {
return ctx.getInvokeAction();
}
case INCOMPLETE:
return ctx.getStopAction(message);
case ERROR:
throw new TransformationException(getClass().getName() +
" transformation error: (" + result.getErrorCode() + ") " +
result.getErrorDescription());
}
return ctx.getInvokeAction();
}
@Override
@SuppressWarnings("unchecked")
public NextAction handleWrite(FilterChainContext ctx) throws IOException {
final Connection connection = ctx.getConnection();
final L message = (L) ctx.getMessage();
final TransformationResult<L, K> result = encoder.transform(connection, message);
switch(result.getStatus()) {
case COMPLETE:
ctx.setMessage(result.getMessage());
final L remainder = result.getExternalRemainder();
final boolean hasRemaining =
encoder.hasInputRemaining(connection, remainder);
encoder.release(connection);
if (hasRemaining) {
return ctx.getInvokeAction(remainder);
} else {
return ctx.getInvokeAction();
}
case INCOMPLETE:
return ctx.getStopAction(message);
case ERROR:
throw new TransformationException(getClass().getName() +
" transformation error: (" + result.getErrorCode() + ") " +
result.getErrorDescription());
}
return ctx.getInvokeAction();
}
@Override
public Transformer<K, L> getDecoder() {
return decoder;
}
@Override
public Transformer<L, K> getEncoder() {
return encoder;
}
}