/*
    * Copyright 2012-2013 the original author or authors.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.springframework.batch.core.configuration.annotation;
  
  import org.springframework.context.annotation.ImportSelector;
  import org.springframework.core.annotation.AnnotationAttributes;
  import org.springframework.core.type.AnnotationMetadata;
  import org.springframework.util.Assert;
  
  /**
   * Base {@code Configuration} class providing common structure for enabling and using Spring Batch. Customization is
   * available by implementing the {@link BatchConfigurer} interface.
   * 
   * @author Dave Syer
   * @since 2.2
   * @see EnableBatchProcessing
   */
  public class BatchConfigurationSelector implements ImportSelector {
  
  	@Override
  	public String[] selectImports(AnnotationMetadata importingClassMetadata) {
  		Class<?> annotationType = EnableBatchProcessing.class;
  		AnnotationAttributes attributes = AnnotationAttributes.fromMap(importingClassMetadata.getAnnotationAttributes(
  				annotationType.getName(), false));
  		Assert.notNull(attributes, String.format("@%s is not present on importing class '%s' as expected",
  				annotationType.getSimpleName(), importingClassMetadata.getClassName()));
  
  		String[] imports;
  		if (attributes.containsKey("modular") && attributes.getBoolean("modular")) {
  			imports = new String[] { ModularBatchConfiguration.class.getName() };
  		}
  		else {
  			imports = new String[] { SimpleBatchConfiguration.class.getName() };
  		}
  
  		return imports;
  	}
  
  }