de.dfki.asr.compass.rest.serialization.ReferenceDeserializer.java Source code

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Here is the source code for de.dfki.asr.compass.rest.serialization.ReferenceDeserializer.java

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/*
 * This file is part of COMPASS. It is subject to the license terms in
 * the LICENSE file found in the top-level directory of this distribution.
 * (Also available at http://www.apache.org/licenses/LICENSE-2.0.txt)
 * You may not use this file except in compliance with the License.
 */
package de.dfki.asr.compass.rest.serialization;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;
import de.dfki.asr.compass.business.api.Manager;
import de.dfki.asr.compass.business.exception.EntityNotFoundException;
import de.dfki.asr.compass.model.AbstractCompassEntity;
import de.dfki.asr.compass.rest.util.CDIInjector;
import java.io.IOException;

public class ReferenceDeserializer<EntityClass extends AbstractCompassEntity>
        extends StdScalarDeserializer<EntityClass> {
    protected Manager<EntityClass> manager;

    public void setManager(final Manager<EntityClass> manager) {
        this.manager = manager;
    }

    public ReferenceDeserializer(final Class<EntityClass> clazz) {
        super(clazz);
        new CDIInjector<ReferenceDeserializer<EntityClass>>().inject(this);
    }

    @Override
    public EntityClass deserialize(final JsonParser jp, final DeserializationContext ctxt)
            throws IOException, JsonProcessingException {
        ObjectCodec oc = jp.getCodec();
        Long id = oc.readValue(jp, new TypeReference<Long>() {
        });
        try {
            return manager.referenceById(id);
        } catch (EntityNotFoundException e) {
            throw new IOException("Cannot load from Database", e);
        }
    }
}