taverna-activity-archetype/src/main/resources/archetype-resources/__rootArtifactId__-activity/src/main/java/__classPrefix__ActivityHealthChecker.java

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##    this work for additional information regarding copyright ownership.
##    The ASF licenses this file to You under the Apache License, Version 2.0
##    (the "License"); you may not use this file except in compliance with
##    the License.  You may obtain a copy of the License at
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##
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##    distributed under the License is distributed on an "AS IS" BASIS,
##    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
##    See the License for the specific language governing permissions and
##    limitations under the License.
##
## Note: Above Velocity comment should NOT be included in generated
## code from the archetype
#set( $symbol_pound = '#' )
#set( $symbol_dollar = '$' )
#set( $symbol_escape = '\' )
package ${package};

import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import com.fasterxml.jackson.databind.JsonNode;

import net.sf.taverna.t2.visit.VisitReport;
import net.sf.taverna.t2.visit.VisitReport.Status;
import net.sf.taverna.t2.workflowmodel.health.HealthCheck;
import net.sf.taverna.t2.workflowmodel.health.HealthChecker;

/**
 * ${classPrefix} <code>HealthChecker</code>.
 */
public class ${classPrefix}ActivityHealthChecker implements
		HealthChecker<${classPrefix}Activity> {

	public boolean canVisit(Object o) {
		// Return True if we can visit the object. We could do
		// deeper (but not time consuming) checks here, for instance
		// if the health checker only deals with ${classPrefix}Activity where
		// a certain configuration option is enabled.
		return o instanceof ${classPrefix}Activity;
	}

	public boolean isTimeConsuming() {
		// Return true if the health checker does a network lookup
		// or similar time consuming checks, in which case
		// it would only be performed when using File->Validate workflow
		// or File->Run.
		return false;
	}

	public VisitReport visit(${classPrefix}Activity activity, List<Object> ancestry) {
		JsonNode config = activity.getConfiguration();

		// We'll build a list of subreports
		List<VisitReport> subReports = new ArrayList<>();

		if (!URI.create(config.get("exampleUri").asText()).isAbsolute()) {
			// Report Severe problems we know won't work
			VisitReport report = new VisitReport(HealthCheck.getInstance(),
					activity, "Example URI must be absolute", HealthCheck.INVALID_URL,
					Status.SEVERE);
			subReports.add(report);
		}

		if (config.get("exampleString").asText().equals("")) {
			// Warning on possible problems
			subReports.add(new VisitReport(HealthCheck.getInstance(), activity,
					"Example string empty", HealthCheck.NO_CONFIGURATION,
					Status.WARNING));
		}

		// The default explanation here will be used if the subreports list is
		// empty
		return new VisitReport(HealthCheck.getInstance(), activity,
				"${classPrefix} service OK", HealthCheck.NO_PROBLEM, subReports);
	}

}