/*
    * Copyright 2001-2008 The Apache Software Foundation.
    * 
    * 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.apache.juddi.query;
  
  import java.util.List;
  import javax.persistence.EntityManager;
  
  import org.apache.juddi.query.util.DynamicQuery;
  import org.apache.juddi.query.util.FindQualifiers;
  import org.apache.juddi.model.UddiEntityPublisher;
  
  /**
   * Returns the list of "entity" keys possessing the publisher Id in the passed in UddiEntityPublisher
   * Output is restricted by list of "entity" keys passed in.  If null, all entities are searched.
   * Output is produced by building the appropriate JPA query based on input and find qualifiers.
   * 
   * @author <a href="mailto:jfaath@apache.org">Jeff Faath</a>
   */
  public class FindEntityByPublisherQuery extends EntityQuery {
  
  	public static final String AUTHORIZED_NAME_FIELD = "authorizedName";
  	
  	private final String entityName;
  	private final String entityAlias;
  	private final String keyName;
  	private final String selectSQL;
  	private String signaturePresent;
  	
  	public FindEntityByPublisherQuery(String entityName, String entityAlias, String keyName, String signaturePresent) {
  		this.entityName = entityName;
  		this.entityAlias = entityAlias;
  		this.keyName = keyName;
  		this.signaturePresent = signaturePresent;
  		
  		StringBuilder sql = new StringBuilder(200);
  		sql.append("select distinct ").append(entityAlias).append(".").append(keyName).append(" from ").append(entityName).append(" ").append(entityAlias).append(" ");
  		selectSQL = sql.toString();
  	}
  
  	public String getEntityName() {
  		return entityName;
  	}
  
  	public String getEntityAlias() {
  		return entityAlias;
  	}
  
  	public String getKeyName() {
  		return keyName;
  	}
  
  	public String getSelectSQL() {
  		return selectSQL;
  	}
  	
  	public String getSignaturePresent() {
  		return signaturePresent;
  	}
  
  	public void setSignaturePresent(String signaturePresent) {
  		this.signaturePresent = signaturePresent;
  	}
  		
  	
  	public List<?> select(EntityManager em, FindQualifiers fq, UddiEntityPublisher publisher, List<?> keysIn, DynamicQuery.Parameter... restrictions) {
  		// If keysIn is not null and empty, then search is over.
  		if ((keysIn != null) && (keysIn.size() == 0))
  			return keysIn;
  		
  		if (publisher == null)
  			return keysIn;
  		
  		DynamicQuery dynamicQry = new DynamicQuery(selectSQL);
  		appendConditions(dynamicQry, fq, publisher);
  		if (restrictions != null && restrictions.length > 0)
  			dynamicQry.AND().pad().appendGroupedAnd(restrictions);
  
  		return getQueryResult(em, dynamicQry, keysIn, entityAlias + "." + keyName);
  	}
  	
  	/*
  	 * Appends the conditions to the query based on the publisher id
  	 */
  	public void appendConditions(DynamicQuery qry, FindQualifiers fq, UddiEntityPublisher publisher) {
 		qry.WHERE().pad();
 		if (fq!=null && fq.isSignaturePresent()) {
 			qry.pad().openParen().pad().append(getSignaturePresent()).pad().closeParen().pad().AND();
 		}
 		qry.appendGroupedAnd(new DynamicQuery.Parameter(entityAlias + "." + AUTHORIZED_NAME_FIELD, publisher.getAuthorizedName(), DynamicQuery.PREDICATE_EQUALS));
 	}
 
 
 }