How to use

org.eclipse.persistence.descriptors.MethodClassExtractor

constructor

/**
 * ADVANCED:
 * A class extraction method can be registered with the descriptor to override the default inheritance mechanism.
 * This allows for a user defined class indicator in place of providing an explicit class indicator field.
 * The method registered must be a static method on the class which has that descriptor. The method must take Record 
 * as an argument (for example, a DatabaseRecord), and must return the class to use for that record.
 * This method will be used to decide which class to instantiate when reading from the database.
 * It is the application's responsibility to populate any typing information in the database required
 * to determine the class from the record.
 * If this method is used then the class indicator field and mapping cannot be used, and in addition, 
 * the descriptor's withAllSubclasses and onlyInstances expressions must also be set up correctly.
 *
 * @see #setWithAllSubclassesExpression(Expression)
 * @see #setOnlyInstancesExpression(Expression)
 */
public void setClassExtractionMethodName(String staticClassClassExtractionMethod) {
  if ((staticClassClassExtractionMethod == null) || (staticClassClassExtractionMethod.length() == 0)) {
    return;
  }
  if (!(getClassExtractor() instanceof MethodClassExtractor)) {
    setClassExtractor(new MethodClassExtractor());
  }
  ((MethodClassExtractor)getClassExtractor()).setClassExtractionMethodName(staticClassClassExtractionMethod);
}

/**
 * ADVANCED:
 * A class extraction method can be registered with the descriptor to override the default inheritance mechanism.
 * This allows for a user defined class indicator in place of providing an explicit class indicator field.
 * The method registered must be a static method on the class which has that descriptor. The method must take Record 
 * as an argument (for example, a DatabaseRecord), and must return the class to use for that record.
 * This method will be used to decide which class to instantiate when reading from the database.
 * It is the application's responsibility to populate any typing information in the database required
 * to determine the class from the record.
 * If this method is used then the class indicator field and mapping cannot be used, and in addition, 
 * the descriptor's withAllSubclasses and onlyInstances expressions must also be set up correctly.
 *
 * @see #setWithAllSubclassesExpression(Expression)
 * @see #setOnlyInstancesExpression(Expression)
 */
public void setClassExtractionMethodName(String staticClassClassExtractionMethod) {
  if ((staticClassClassExtractionMethod == null) || (staticClassClassExtractionMethod.length() == 0)) {
    return;
  }
  if (!(getClassExtractor() instanceof MethodClassExtractor)) {
    setClassExtractor(new MethodClassExtractor());
  }
  ((MethodClassExtractor)getClassExtractor()).setClassExtractionMethodName(staticClassClassExtractionMethod);
}

/**
 * ADVANCED:
 * A class extraction method can be registered with the descriptor to override the default inheritance mechanism.
 * This allows for a user defined class indicator in place of providing an explicit class indicator field.
 * The method registered must be a static method on the class which has that descriptor. The method must take Record
 * as an argument (for example, a DatabaseRecord), and must return the class to use for that record.
 * This method will be used to decide which class to instantiate when reading from the database.
 * It is the application's responsibility to populate any typing information in the database required
 * to determine the class from the record.
 * If this method is used then the class indicator field and mapping cannot be used, and in addition,
 * the descriptor's withAllSubclasses and onlyInstances expressions must also be set up correctly.
 *
 * @see #setWithAllSubclassesExpression(Expression)
 * @see #setOnlyInstancesExpression(Expression)
 */
public void setClassExtractionMethodName(String staticClassClassExtractionMethod) {
  if ((staticClassClassExtractionMethod == null) || (staticClassClassExtractionMethod.length() == 0)) {
    return;
  }
  if (!(getClassExtractor() instanceof MethodClassExtractor)) {
    setClassExtractor(new MethodClassExtractor());
  }
  ((MethodClassExtractor)getClassExtractor()).setClassExtractionMethodName(staticClassClassExtractionMethod);
}