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  package org.apache.cayenne.project.upgrade.handlers;
  
  import java.io.InputStreamReader;
  import java.io.StringReader;
  import javax.xml.parsers.DocumentBuilder;
  import javax.xml.parsers.DocumentBuilderFactory;
  
  import org.apache.cayenne.project.upgrade.UpgradeUnit;
  import org.apache.cayenne.resource.URLResource;
  import org.junit.Before;
  import org.w3c.dom.Document;
  import org.xml.sax.InputSource;
  
  /**
   * @since 4.1
   */
  abstract class BaseUpgradeHandlerTest {
  
      UpgradeHandler handler;
  
      @Before
      public void createHandler() {
          handler = newHandler();
      }
  
      abstract UpgradeHandler newHandler();
  
      Document processProjectDom(String xmlResourceName) throws Exception {
          UpgradeUnit unit = new UpgradeUnit(new URLResource(getClass().getResource(xmlResourceName)),
                  documentFromResource(xmlResourceName));
          handler.processProjectDom(unit);
          return unit.getDocument();
      }
  
      Document processDataMapDom(String xmlResourceName) throws Exception {
          UpgradeUnit unit = new UpgradeUnit(new URLResource(getClass().getResource(xmlResourceName)),
                  documentFromResource(xmlResourceName));
          handler.processDataMapDom(unit);
          return unit.getDocument();
      }
  
      Document documentFromString(String xml) throws Exception {
          DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
          return db.parse(new InputSource(new StringReader(xml)));
      }
  
      Document documentFromResource(String resource) throws Exception {
          DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
          return db.parse(new InputSource(new InputStreamReader(getClass().getResourceAsStream(resource))));
      }
  
  }
  