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package com.sun.grizzly;

import com.sun.grizzly.TransformationResult.Status;
import com.sun.grizzly.attributes.Attribute;
import com.sun.grizzly.attributes.AttributeBuilder;
import com.sun.grizzly.attributes.AttributeHolder;
import com.sun.grizzly.memory.MemoryManager;
import com.sun.grizzly.attributes.AttributeStorage;

/**
 *
 * @author oleksiys
 */
public abstract class AbstractTransformer implements Transformer {
    protected static TransformationResult incompletedResult =
            new TransformationResult(Status.INCOMPLED);

    protected AttributeBuilder attributeBuilder =
            Grizzly.DEFAULT_ATTRIBUTE_BUILDER;

    protected Attribute inputBufferAttribute;
    protected Attribute outputBufferAttribute;

    protected Attribute> lastResultAttribute;

    private MemoryManager memoryManager;

    public AbstractTransformer() {
        String namePrefix = getClass().getName();

        inputBufferAttribute = attributeBuilder.createAttribute(namePrefix +
                ".inputBuffer");
        outputBufferAttribute = attributeBuilder.createAttribute(namePrefix +
                ".outputBuffer");
        lastResultAttribute = attributeBuilder.createAttribute(namePrefix +
                ".lastResult");
    }

    public TransformationResult transform(AttributeStorage storage)
            throws TransformationException {

        return transform(storage, getInput(storage), getOutput(storage));
    }

    public K getInput(AttributeStorage storage) {
        return inputBufferAttribute.get(storage);
    }

    public void setInput(AttributeStorage storage, K input) {
        inputBufferAttribute.set(storage, input);
    }

    public L getOutput(AttributeStorage storage) {
        return outputBufferAttribute.get(storage);
    }

    public void setOutput(AttributeStorage storage, L output) {
        outputBufferAttribute.set(storage, output);
    }

    public TransformationResult getLastResult(AttributeStorage storage) {
        return lastResultAttribute.get(storage);
    }

    public AttributeHolder getProperties(AttributeStorage storage) {
        return storage.getAttributes();
    }

    public void hibernate(AttributeStorage storage) {
    }

    public void release(AttributeStorage storage) {
        inputBufferAttribute.remove(storage);
        outputBufferAttribute.remove(storage);
        lastResultAttribute.remove(storage);
    }


    protected MemoryManager obtainMemoryManager(AttributeStorage storage) {
        if (memoryManager != null) {
            return memoryManager;
        }

        if (storage instanceof Connection) {
            Connection connection = (Connection) storage;
            return connection.getTransport().getMemoryManager();
        }

        return null;
    }
    
    public MemoryManager getMemoryManager() {
        return memoryManager;
    }

    public void setMemoryManager(MemoryManager memoryManager) {
        this.memoryManager = memoryManager;
    }

    public static  T getValue(final AttributeStorage storage,
            final Attribute attribute,
            final T defaultValue) {
        final T value = attribute.get(storage);
        if (value != null) {
            return value;
        }

        return defaultValue;
    }
}