org.mqnaas.api.providers.MultiMapSerializationProvider.java Source code

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Here is the source code for org.mqnaas.api.providers.MultiMapSerializationProvider.java

Source

package org.mqnaas.api.providers;

/*
 * #%L
 * MQNaaS :: REST API Provider
 * %%
 * Copyright (C) 2007 - 2015 Fundaci Privada i2CAT, Internet i Innovaci a Catalunya
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
 * #L%
 */

import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;

import org.mqnaas.core.api.IIdentifiable;

import com.google.common.collect.Multimap;

/**
 * 
 * @author Georg Mansky-Kummert (i2CAT)
 */

public class MultiMapSerializationProvider extends AbstractMessageBodyWriter<Object> {

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {

        boolean isWriteable = Multimap.class.isAssignableFrom(type);

        if (isWriteable && genericType instanceof ParameterizedType) {
            // TODO How can we configure custom serializers? Type information is not available at runtime
            ParameterizedType parameterizedType = (ParameterizedType) genericType;
            Type[] arguments = parameterizedType.getActualTypeArguments();
            isWriteable = arguments[0].equals(Class.class) && arguments[1].equals(IIdentifiable.class);
        }

        return isWriteable;
    }

    @Override
    public void writeTo(Object t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
            throws IOException, WebApplicationException {

        StringBuilder sb = new StringBuilder();

        Multimap<Class<?>, IIdentifiable> multimap = (Multimap<Class<?>, IIdentifiable>) t;

        sb.append("<services>");

        for (Class<?> capability : multimap.keySet()) {
            sb.append("<capability name=\"").append(capability.getName()).append("\">");

            for (IIdentifiable identifiable : multimap.get(capability)) {

                sb.append("<service>");
                sb.append(identifiable.getId());
                sb.append("</service>");
            }

            sb.append("</capability>");
        }

        sb.append("</services>");

        entityStream.write(sb.toString().getBytes());
    }
}