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  package org.apache.cayenne.project.validation;
  
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.configuration.DataNodeDescriptor;
  import org.apache.cayenne.configuration.runtime.XMLPoolingDataSourceFactory;
  import org.apache.cayenne.util.Util;
  import org.apache.cayenne.validation.ValidationResult;
  
  import java.util.function.Supplier;
  
  class DataNodeValidator extends ConfigurationNodeValidator<DataNodeDescriptor> {
  
      /**
       * @param configSupplier the config defining the behavior of this validator.
       * @since 5.0
       */
      public DataNodeValidator(Supplier<ValidationConfig> configSupplier) {
          super(configSupplier);
      }
  
      @Override
      public void validate(DataNodeDescriptor node, ValidationResult validationResult) {
          on(node, validationResult)
                  .performIfEnabled(Inspection.DATA_NODE_NO_NAME, this::checkForName)
                  .performIfEnabled(Inspection.DATA_NODE_NAME_DUPLICATE, this::checkForNameDuplicates)
                  .performIfEnabled(Inspection.DATA_NODE_CONNECTION_PARAMS, this::validateConnection);
      }
  
      private void checkForName(DataNodeDescriptor node, ValidationResult validationResult) {
          String name = node.getName();
          if (Util.isEmptyString(name)) {
              addFailure(validationResult, node, "Unnamed DataNode");
          }
  
      }
  
      private void checkForNameDuplicates(DataNodeDescriptor node, ValidationResult validationResult) {
          String name = node.getName();
          if (Util.isEmptyString(name)) {
              return;
          }
          DataChannelDescriptor dataChannelDescriptor = node.getDataChannelDescriptor();
  
          // check for duplicate names in the parent context
          for (DataNodeDescriptor otherNode : dataChannelDescriptor.getNodeDescriptors()) {
              if (otherNode == node) {
                  continue;
              }
  
              if (name.equals(otherNode.getName())) {
                  addFailure(validationResult, node, "Duplicate DataNode name: %s", name);
                  return;
              }
          }
      }
  
      private void validateConnection(DataNodeDescriptor node, ValidationResult validationResult) {
          String factory = node.getDataSourceFactoryType();
  
          // TODO: andrus 03/10/2010 - null factory is allowed, however
          //  'getDataSourceDescriptor' must ne not null in this case
  
          if (factory == null || XMLPoolingDataSourceFactory.class.getName().equals(factory)) {
              return;
          }
          String parameters = node.getParameters();
          if (Util.isEmptyString(parameters)) {
              addFailure(validationResult, node, "DataNode has empty 'parameters' string");
          }
      }
  }
  