LoadPolicyUtils.java

package eu.europa.esig.dss.validation.process.bbb;

import static org.junit.Assert.assertNotNull;

import java.io.FileInputStream;
import java.io.InputStream;

import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

import eu.europa.esig.dss.utils.Utils;
import eu.europa.esig.dss.validation.policy.EtsiValidationPolicy;
import eu.europa.esig.jaxb.policy.ConstraintsParameters;

public class LoadPolicyUtils {

	public static EtsiValidationPolicy loadPolicy() throws Exception {
		FileInputStream policyFis = new FileInputStream("src/main/resources/policy/test_constraint.xml");
		ConstraintsParameters policyJaxB = getJAXBObjectFromString(policyFis, ConstraintsParameters.class);
		assertNotNull(policyJaxB);
		return new EtsiValidationPolicy(policyJaxB);
	}

	private static <T extends Object> T getJAXBObjectFromString(InputStream is, Class<T> clazz) throws Exception {
		return getJAXBObjectFromString(is, clazz, null);
	}

	@SuppressWarnings("unchecked")
	public static <T extends Object> T getJAXBObjectFromString(InputStream is, Class<T> clazz, String xsd)
			throws Exception {
		JAXBContext context = JAXBContext.newInstance(clazz.getPackage().getName());
		Unmarshaller unmarshaller = context.createUnmarshaller();
		if (Utils.isStringNotEmpty(xsd)) {
			SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
			InputStream inputStream = LoadPolicyUtils.class.getResourceAsStream(xsd);
			Source source = new StreamSource(inputStream);
			Schema schema = sf.newSchema(source);
			unmarshaller.setSchema(schema);
		}
		return (T) unmarshaller.unmarshal(is);
	}

}