package liquibase.servicelocator;
   
   import java.util.HashSet;
   import java.util.Set;
   
   /**
    * Package scan filter for testing if a given class is assignable to another class.
    */
   public class AssignableToPackageScanFilter implements PackageScanFilter {
      private final Set<Class<?>> parents = new HashSet<Class<?>>();
  
      public AssignableToPackageScanFilter() {
      }
  
      public AssignableToPackageScanFilter(Class<?> parentType) {
          parents.add(parentType);
      }
  
      public AssignableToPackageScanFilter(Set<Class<?>> parents) {
          this.parents.addAll(parents);
      }
  
      public void addParentType(Class<?> parentType) {
          parents.add(parentType);
      }
  
      public boolean matches(Class<?> type) {
          if (parents != null && parents.size() > 0) {
              for (Class<?> parent : parents) {
                  if (parent.isAssignableFrom(type)) {
                      return true;
                  }
              }
          }
          return false;
      }
  
      @Override
      public String toString() {
          StringBuilder sb = new StringBuilder();
          for (Class<?> parent : parents) {
              sb.append(parent.getSimpleName()).append(", ");
          }
          sb.setLength(sb.length() > 0 ? sb.length() - 2 : 0);
          return "is assignable to " + sb;
      }
  }