JobInstanceDeserializer.java example

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/*
 * This is eMonocot, a global online biodiversity information resource.
 *
 * Copyright © 2011–2015 The Board of Trustees of the Royal Botanic Gardens, Kew and The University of Oxford
 *
 * eMonocot is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * eMonocot 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 Affero General Public License for more details.
 *
 * The complete text of the GNU Affero General Public License is in the source repository as the file
 * ‘COPYING’.  It is also available from <http://www.gnu.org/licenses/>.
 */
package org.emonocot.model.marshall.json;

import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import org.springframework.batch.core.JobInstance;
import org.springframework.batch.core.JobParameter;
import org.springframework.batch.core.JobParameter.ParameterType;
import org.springframework.batch.core.JobParameters;

/**
 *
 * @author ben
 *
 */
public class JobInstanceDeserializer extends JsonDeserializer<JobInstance> {

	@Override
	public final JobInstance deserialize(final JsonParser jsonParser,
			final DeserializationContext deserializationContext)
					throws IOException {
		JsonToken jsonToken = jsonParser.nextToken();
		assert jsonParser.getCurrentName() == "id";
		jsonParser.nextToken();
		long jobId = jsonParser.getLongValue();
		jsonParser.nextToken();
		assert jsonParser.getCurrentName() == "jobName";
		jsonParser.nextToken();
		String jobName = jsonParser.getText();
		jsonParser.nextToken();
		assert jsonParser.getCurrentName() == "version";
		jsonParser.nextToken();
		Integer version = jsonParser.getValueAsInt();
		jsonParser.nextToken();
		assert jsonParser.getCurrentName() == "parameters";
		jsonToken = jsonParser.nextToken();
		assert jsonToken == JsonToken.START_ARRAY;
		Map<String, JobParameter> jobParameterMap = new HashMap<String, JobParameter>();
		while (jsonToken != JsonToken.END_ARRAY) {
			jsonToken = jsonParser.nextToken();
			if (jsonToken == JsonToken.END_ARRAY) {

			} else {
				assert jsonToken == JsonToken.START_OBJECT;
				jsonToken = jsonParser.nextToken();
				assert jsonParser.getCurrentName() == "name";
				jsonToken = jsonParser.nextToken();
				String parameterName = jsonParser.getText();
				jsonToken = jsonParser.nextToken();
				assert jsonParser.getCurrentName() == "type";
				jsonToken = jsonParser.nextToken();
				ParameterType type = ParameterType
						.valueOf(jsonParser.getText());
				jsonToken = jsonParser.nextToken();
				assert jsonParser.getCurrentName() == "value";
				jsonToken = jsonParser.nextToken();
				JobParameter jobParameter = null;

				switch (type) {
				case DATE:
					jobParameter = new JobParameter(new Date(
							jsonParser.getLongValue()));
					break;
				case LONG:
					jobParameter = new JobParameter(jsonParser.getLongValue());
					break;
				case DOUBLE:
					jobParameter = new JobParameter(jsonParser.getDoubleValue());
					break;
				case STRING:
				default:
					jobParameter = new JobParameter(jsonParser.getText());
				}
				jobParameterMap.put(parameterName, jobParameter);
				jsonToken = jsonParser.nextToken();
				assert jsonToken == jsonToken.END_OBJECT;

				jsonToken = jsonParser.nextToken();
			}
		}

		JobParameters jobParameters = new JobParameters(jobParameterMap);
		JobInstance jobInstance = new JobInstance(jobId, jobParameters, jobName);
		jobInstance.setVersion(version);
		return jobInstance;
	}

}