001    /**
002     * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
003     * Licensed under the Apache License, Version 2.0 (the "License");
004     * you may not use this file except in compliance with the License.
005     * You may obtain a copy of the License at
006     *
007     *   http://www.apache.org/licenses/LICENSE-2.0
008     *
009     *  Unless required by applicable law or agreed to in writing, software
010     *  distributed under the License is distributed on an "AS IS" BASIS,
011     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012     *  See the License for the specific language governing permissions and
013     *  limitations under the License. See accompanying LICENSE file.
014     */
015    package org.apache.oozie.executor.jpa;
016    
017    import java.util.List;
018    
019    import javax.persistence.EntityManager;
020    import javax.persistence.Query;
021    
022    import org.apache.oozie.CoordinatorActionBean;
023    import org.apache.oozie.ErrorCode;
024    import org.apache.oozie.util.ParamChecker;
025    
026    /**
027     * Load coordinator action by externalId.
028     */
029    public class CoordActionGetForExternalIdJPAExecutor implements JPAExecutor<CoordinatorActionBean> {
030    
031        private String externalId = null;
032    
033        public CoordActionGetForExternalIdJPAExecutor(String externalId) {
034            ParamChecker.notNull(externalId, "externalId");
035            this.externalId = externalId;
036        }
037    
038        /* (non-Javadoc)
039         * @see org.apache.oozie.executor.jpa.JPAExecutor#getName()
040         */
041        @Override
042        public String getName() {
043            return "CoordActionGetForExternalIdJPAExecutor";
044        }
045    
046        /* (non-Javadoc)
047         * @see org.apache.oozie.executor.jpa.JPAExecutor#execute(javax.persistence.EntityManager)
048         */
049        @Override
050        @SuppressWarnings("unchecked")
051        public CoordinatorActionBean execute(EntityManager em) throws JPAExecutorException {
052            try {
053                CoordinatorActionBean caBean = null;
054                Query q = em.createNamedQuery("GET_COORD_ACTION_FOR_EXTERNALID");
055                q.setParameter("externalId", externalId);
056                List<CoordinatorActionBean> actionList = q.getResultList();
057                if (actionList.size() > 0) {
058                    caBean = actionList.get(0);
059                }
060                return caBean;
061            }
062            catch (Exception e) {
063                throw new JPAExecutorException(ErrorCode.E0603, e);
064            }
065        }
066    
067    }