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1   /*
2    * Copyright 2001-2008 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   *
16   */
17  
18  package org.apache.juddi.query;
19  
20  import java.util.List;
21  
22  import javax.persistence.EntityManager;
23  
24  import org.apache.juddi.query.util.DynamicQuery;
25  import org.apache.juddi.query.util.FindQualifiers;
26  import org.uddi.api_v3.CategoryBag;
27  
28  /**
29   * Returns the list of service keys possessing the keyedReferences in the passed category bag.
30   * Output is restricted by list of service keys passed in.  If null, all business services are searched.
31   * Output is produced by building the appropriate JPA query based on input and find qualifiers.
32   * 
33   * From specification:
34   * "This is a list of category references.  The returned serviceList contains serviceInfo structures matching all of 
35   * the categories passed (logical AND by default).   Specifying the appropriate findQualifiers can override this behavior."
36   * 
37   * @author <a href="mailto:jfaath@apache.org">Jeff Faath</a>
38   */
39  public class FindServiceByCategoryQuery {
40  	
41  	private static final String ENTITY_NAME_CHILD = "ServiceCategoryBag";
42  	
43  	private static final FindEntityByCategoryQuery findQuery;
44  	
45  	static {
46  		findQuery = new FindEntityByCategoryQuery(BusinessServiceQuery.ENTITY_NAME, 
47  												  BusinessServiceQuery.ENTITY_ALIAS, 
48  												  BusinessServiceQuery.KEY_NAME, 
49  												  BusinessServiceQuery.ENTITY_FIELD, 
50  												  ENTITY_NAME_CHILD,
51  												  BusinessServiceQuery.SIGNATURE_PRESENT);
52  	}
53  	
54  	public static List<Object> select(EntityManager em, FindQualifiers fq, CategoryBag categoryBag, String parentKey, List<Object> keysIn) {
55  		if (parentKey != null && parentKey.length() > 0) {
56  			DynamicQuery.Parameter param = new DynamicQuery.Parameter(BusinessServiceQuery.ENTITY_ALIAS + "." 
57  					+ BusinessServiceQuery.KEY_NAME_PARENT, parentKey, DynamicQuery.PREDICATE_EQUALS); 
58  			return findQuery.select(em, fq, categoryBag, keysIn, param);
59  		}
60  		else
61  			return findQuery.select(em, fq, categoryBag, keysIn);
62  	}
63  }