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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

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package org.optaplanner.examples.common.persistence.jackson;

import java.io.IOException;

import org.optaplanner.examples.common.domain.AbstractPersistable;

import com.fasterxml.jackson.annotation.ObjectIdGenerator;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

/**
 * Serializes a child of {@link AbstractPersistable} to a JSON map key using {@link JacksonUniqueIdGenerator}.
 *
 * @param  The type must have a {@link com.fasterxml.jackson.annotation.JsonIdentityInfo} annotation with
 *        {@link JacksonUniqueIdGenerator} as its generator.
 */
public final class KeySerializer extends JsonSerializer {

    private final ObjectIdGenerator idGenerator = new JacksonUniqueIdGenerator();

    @Override
    public void serialize(E persistable, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
            throws IOException {
        Object jsonId = serializerProvider.findObjectId(persistable, idGenerator)
                .generateId(persistable);
        jsonGenerator.writeFieldName(jsonId.toString());
    }
}