001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *      http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.oozie.executor.jpa;
020
021import java.sql.SQLException;
022import java.util.ArrayList;
023import java.util.List;
024
025import javax.persistence.EntityManager;
026import javax.persistence.Query;
027
028import org.apache.oozie.ErrorCode;
029import org.apache.oozie.WorkflowActionBean;
030import org.apache.oozie.util.ParamChecker;
031import org.apache.openjpa.persistence.OpenJPAPersistence;
032
033/**
034 * JPA Command to get subset of workflow actions for a particular workflow.
035 */
036public class WorkflowActionSubsetGetJPAExecutor implements JPAExecutor<List<WorkflowActionBean>> {
037
038    private final String wfId;
039    private final int start;
040    private final int length;
041
042    /**
043     * This Constructor creates the WorkflowActionSubsetGetJPAExecutor object Which gets the List of wrokflow action
044     * bean.
045     *
046     * @param wfId
047     * @param start
048     * @param length
049     */
050    public WorkflowActionSubsetGetJPAExecutor(String wfId, int start, int length) {
051        ParamChecker.notNull(wfId, "wfJobId");
052        this.wfId = wfId;
053        this.start = start;
054        this.length = length;
055    }
056
057    /* (non-Javadoc)
058     * @see org.apache.oozie.executor.jpa.JPAExecutor#execute(javax.persistence.EntityManager)
059     */
060    @Override
061    @SuppressWarnings("unchecked")
062    public List<WorkflowActionBean> execute(EntityManager em) throws JPAExecutorException {
063        List<WorkflowActionBean> actions;
064        List<WorkflowActionBean> actionList = new ArrayList<WorkflowActionBean>();
065        try {
066            Query q = em.createNamedQuery("GET_ACTIONS_FOR_WORKFLOW");
067            OpenJPAPersistence.cast(q);
068            q.setParameter("wfId", wfId);
069            q.setFirstResult(start - 1);
070            q.setMaxResults(length);
071            actions = q.getResultList();
072        }
073        catch (Exception e) {
074            throw new JPAExecutorException(ErrorCode.E0605, "null", e);
075        }
076        return actions;
077    }
078
079    /* (non-Javadoc)
080     * @see org.apache.oozie.executor.jpa.JPAExecutor#getName()
081     */
082    @Override
083    public String getName() {
084        return "WorkflowActionSubsetGetJPAExecutor";
085    }
086}