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Allows creating JAX-RS jersey resources that will handle incoming http requests to vert.x

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package com.englishtown.vertx.jersey.impl;

import com.englishtown.vertx.jersey.WriteStreamOutput;
import io.vertx.core.Handler;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.http.HttpServerResponse;

/**
 * Default implementation of {@link com.englishtown.vertx.jersey.WriteStreamOutput}
 */
public class DefaultWriteStreamOutput implements WriteStreamOutput {

    private HttpServerResponse response;
    private Handler endHandler;

    /**
     * {@inheritDoc}
     */
    @Override
    public WriteStreamOutput init(HttpServerResponse response, Handler endHandler) {
        this.response = response;
        this.endHandler = endHandler;
        return this;
    }

    /**
     * Flag to indicate if the {@link io.vertx.core.http.HttpServerResponse} has been set yet.
     *
     * @return boolean flag
     */
    @Override
    public boolean isResponseSet() {
        return (response != null);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void end() {
        checkResponseSet();
        if (endHandler != null) {
            endHandler.handle(null);
        } else {
            response.end();
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public WriteStreamOutput write(Buffer data) {
        checkResponseSet();
        response.write(data);
        return this;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public WriteStreamOutput setWriteQueueMaxSize(int maxSize) {
        checkResponseSet();
        response.setWriteQueueMaxSize(maxSize);
        return null;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean writeQueueFull() {
        checkResponseSet();
        return response.writeQueueFull();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public WriteStreamOutput drainHandler(Handler handler) {
        checkResponseSet();
        response.drainHandler(handler);
        return this;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public WriteStreamOutput exceptionHandler(Handler handler) {
        checkResponseSet();
        response.exceptionHandler(handler);
        return this;
    }

    private void checkResponseSet() {
        if (response == null) {
            throw new IllegalStateException("The HttpServerResponse has not been set yet.");
        }
    }

}