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package org.glassfish.grizzly.compression.lzma;
import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.TransformationResult;
import org.glassfish.grizzly.filterchain.BaseFilter;
import org.glassfish.grizzly.filterchain.FilterChainContext;
import org.glassfish.grizzly.filterchain.NextAction;
import java.io.IOException;
public class LZMAFilter extends BaseFilter {
private final LZMAEncoder encoder = new LZMAEncoder();
private final LZMADecoder decoder = new LZMADecoder();
// ----------------------------------------------------- Methods from Filter
@Override
public NextAction handleRead(FilterChainContext ctx) throws IOException {
final Connection connection = ctx.getConnection();
final Buffer input = (Buffer) ctx.getMessage();
final TransformationResult<Buffer, Buffer> result =
decoder.transform(connection, input);
final Buffer remainder = result.getExternalRemainder();
if (remainder == null) {
input.tryDispose();
} else {
input.shrink();
}
try {
switch (result.getStatus()) {
case COMPLETE: {
ctx.setMessage(result.getMessage());
decoder.finish(connection);
return ctx.getInvokeAction(remainder);
}
case INCOMPLETE: {
return ctx.getStopAction(remainder);
}
case ERROR: {
throw new IllegalStateException("LZMA decode error. Code: "
+ result.getErrorCode() + " Description: "
+ result.getErrorDescription());
}
default:
throw new IllegalStateException("Unexpected status: " +
result.getStatus());
}
} finally {
result.recycle();
}
}
@Override
public NextAction handleWrite(FilterChainContext ctx) throws IOException {
final Connection connection = ctx.getConnection();
final Buffer input = (Buffer) ctx.getMessage();
final TransformationResult<Buffer, Buffer> result =
encoder.transform(connection, input);
if (!input.hasRemaining()) {
input.tryDispose();
} else {
input.shrink();
}
try {
switch (result.getStatus()) {
case COMPLETE:
encoder.finish(connection);
case INCOMPLETE: {
final Buffer readyBuffer = result.getMessage();
if (readyBuffer != null) {
ctx.setMessage(readyBuffer);
return ctx.getInvokeAction();
} else {
return ctx.getStopAction();
}
}
case ERROR: {
throw new IllegalStateException("LZMA encode error. Code: "
+ result.getErrorCode() + " Description: "
+ result.getErrorDescription());
}
default:
throw new IllegalStateException("Unexpected status: " +
result.getStatus());
}
} finally {
result.recycle();
}
}
@Override
public NextAction handleClose(FilterChainContext ctx) throws IOException {
final Connection connection = ctx.getConnection();
decoder.release(connection);
encoder.release(connection);
return super.handleClose(ctx);
}
}