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 *
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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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package com.pdd.pop.ext.glassfish.grizzly.streams;

import com.pdd.pop.ext.glassfish.grizzly.Buffer;
import com.pdd.pop.ext.glassfish.grizzly.CompletionHandler;
import com.pdd.pop.ext.glassfish.grizzly.Connection;
import com.pdd.pop.ext.glassfish.grizzly.Grizzly;
import com.pdd.pop.ext.glassfish.grizzly.GrizzlyFuture;
import com.pdd.pop.ext.glassfish.grizzly.TransformationResult;
import com.pdd.pop.ext.glassfish.grizzly.TransformationResult.Status;
import com.pdd.pop.ext.glassfish.grizzly.Transformer;
import com.pdd.pop.ext.glassfish.grizzly.attributes.Attribute;
import com.pdd.pop.ext.glassfish.grizzly.attributes.AttributeStorage;
import com.pdd.pop.ext.glassfish.grizzly.impl.ReadyFutureImpl;
import com.pdd.pop.ext.glassfish.grizzly.memory.CompositeBuffer;
import com.pdd.pop.ext.glassfish.grizzly.memory.MemoryManager;
import java.io.IOException;

/**
 *
 * @author Alexey Stashok
 */
@SuppressWarnings("unchecked")
public class TransformerOutput extends BufferedOutput {

    private final Attribute outputBufferAttr;
    protected final Transformer transformer;
    protected final Output underlyingOutput;
    protected final MemoryManager memoryManager;
    protected final AttributeStorage attributeStorage;

    public TransformerOutput(Transformer transformer,
            Output underlyingOutput, Connection connection) {
        this(transformer, underlyingOutput,
                connection.getMemoryManager(), connection);
    }

    public TransformerOutput(Transformer transformer,
            Output underlyingOutput, MemoryManager memoryManager,
            AttributeStorage attributeStorage) {

        this.transformer = transformer;
        this.underlyingOutput = underlyingOutput;
        this.memoryManager = memoryManager;
        this.attributeStorage = attributeStorage;

        outputBufferAttr = Grizzly.DEFAULT_ATTRIBUTE_BUILDER.createAttribute(
                "TransformerOutput-" + transformer.getName());
    }

    @Override
    protected GrizzlyFuture flush0(Buffer buffer,
            final CompletionHandler completionHandler)
            throws IOException {
        
        if (buffer != null) {
            CompositeBuffer savedBuffer = outputBufferAttr.get(attributeStorage);
            if (savedBuffer != null) {
                savedBuffer.append(buffer);
                buffer = savedBuffer;
            }

            do {
                final TransformationResult result =
                        transformer.transform(attributeStorage, buffer);
                final Status status = result.getStatus();

                if (status == Status.COMPLETE) {
                    final Buffer outputBuffer = result.getMessage();
                    underlyingOutput.write(outputBuffer);
                    transformer.release(attributeStorage);
                } else if (status == Status.INCOMPLETE) {
                    buffer.compact();
                    if (!buffer.isComposite()) {
                        buffer = CompositeBuffer.newBuffer(
                                memoryManager, buffer);
                    }
                    outputBufferAttr.set(attributeStorage, (CompositeBuffer) buffer);

                    return ReadyFutureImpl.create(
                            new IllegalStateException("Can not flush data: " +
                            "Insufficient input data for transformer"));
                } else if (status == Status.ERROR) {
                    transformer.release(attributeStorage);
                    throw new IOException("Transformation exception: "
                            + result.getErrorDescription());
                }
            } while (buffer.hasRemaining());

            return underlyingOutput.flush(completionHandler);
        }

        return ZERO_READY_FUTURE;
    }

    @Override
    protected Buffer newBuffer(int size) {
        return memoryManager.allocate(size);
    }

    @Override
    protected Buffer reallocateBuffer(Buffer oldBuffer, int size) {
        return memoryManager.reallocate(oldBuffer, size);
    }

    @Override
    protected void onClosed() throws IOException {
    }
}