DefaultMessageRenderer.java

/*
 * The MIT License
 *
 * Copyright 2014 tim.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.mastfrog.acteur.sse;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.mastfrog.acteur.spi.ApplicationControl;
import java.io.IOException;
import javax.inject.Inject;

/**
 * Default implementation which just uses Jackson to convert messages to JSON.
 *
 * @author Tim Boudreau
 */
final class DefaultMessageRenderer implements MessageRenderer {

    private final ObjectMapper codec;
    private final ApplicationControl ctrl;

    @Inject
    DefaultMessageRenderer(ObjectMapper codec, ApplicationControl ctrl) {
        this.codec = codec;
        this.ctrl = ctrl;
    }

    @Override
    public String toString(Object msg) {
        if (msg instanceof String) {
            return msg.toString();
        }
        try {
            return codec.writeValueAsString(msg);
        } catch (IOException ex) {
            ctrl.internalOnError(ex);
            return null;
        }
    }

}