TransactionTargetSerializer.java

package com.casper.sdk.jackson.serializer;

import com.casper.sdk.model.transaction.target.Native;
import com.casper.sdk.model.transaction.target.Session;
import com.casper.sdk.model.transaction.target.Stored;
import com.casper.sdk.model.transaction.target.TransactionTarget;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.syntifi.crypto.key.encdec.Hex;

import java.io.IOException;

import static com.casper.sdk.model.transaction.target.TargetConstants.*;

/**
 * Serializes {@link TransactionTarget} objects.
 *
 * @author carl@stormeye.co.uk
 */
public class TransactionTargetSerializer extends JsonSerializer<TransactionTarget> {

    @Override
    public void serialize(final TransactionTarget value, final JsonGenerator gen, final SerializerProvider serializers) throws IOException {

        if (value instanceof Session) {
            serializeSession((Session) value, gen);
        } else if (value instanceof Native) {
            gen.writeString(NATIVE);
        } else if (value instanceof Stored) {
            serializeStored((Stored) value, gen);
        } else {
            throw new IllegalArgumentException("Unknown transaction target type: " + value.getClass().getName());
        }
    }

    private static void serializeStored(final Stored value, final JsonGenerator gen) throws IOException {
        gen.writeStartObject();
        gen.writeFieldName(STORED);
        gen.writeStartObject();
        gen.writeFieldName(ID);
        gen.writeObject(value.getId());
        if (value.getRuntime() != null) {
            gen.writeFieldName(RUNTIME);
            value.getRuntime().toJson(gen);
        }
        gen.writeEndObject();
        gen.writeEndObject();
    }

    private static void serializeSession(final Session value, final JsonGenerator gen) throws IOException {
        gen.writeStartObject();
        gen.writeFieldName(SESSION);
        gen.writeStartObject();
        gen.writeBooleanField(IS_INSTALL_UPGRADE, value.isInstallUpgrade());
        if (value.getRuntime() != null) {
            gen.writeFieldName(RUNTIME);
            value.getRuntime().toJson(gen);
        }
        gen.writeStringField(MODULE_BYTES, Hex.encode(value.getModuleBytes()));

        gen.writeEndObject();
        gen.writeEndObject();
    }
}