/**
 * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
 * 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. See accompanying LICENSE file.
 */
package org.apache.oozie.executor.jpa;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.Query;

import org.apache.oozie.BundleActionBean;
import org.apache.oozie.ErrorCode;
import org.apache.oozie.util.ParamChecker;

/**
 * Load the BundleAction into a Bean and return it.
 */
public class BundleActionGetJPAExecutor implements JPAExecutor<BundleActionBean> {

    private String bundleActionId = null;

    /**
     * The constructor for class {@link BundleActionGetJPAExecutor}
     *
     * @param bundleId bundle job id
     * @param coordName coordinator name
     */
    public BundleActionGetJPAExecutor(String bundleId, String coordName) {
        ParamChecker.notNull(bundleId, "bundleId");
        ParamChecker.notNull(coordName, "coordName");
        this.bundleActionId = bundleId + "_" + coordName;
    }

    /* (non-Javadoc)
     * @see org.apache.oozie.executor.jpa.JPAExecutor#getName()
     */
    @Override
    public String getName() {
        return "BundleActionGetJPAExecutor";
    }

    /* (non-Javadoc)
     * @see org.apache.oozie.executor.jpa.JPAExecutor#execute(javax.persistence.EntityManager)
     */
    @Override
    @SuppressWarnings("unchecked")
    public BundleActionBean execute(EntityManager em) throws JPAExecutorException {
        List<BundleActionBean> baBeans;
        try {
            Query q = em.createNamedQuery("GET_BUNDLE_ACTION");
            q.setParameter("bundleActionId", bundleActionId);
            baBeans = q.getResultList();
        }
        catch (Exception e) {
            throw new JPAExecutorException(ErrorCode.E0603, e);
        }

        BundleActionBean bean = null;
        if (baBeans != null && baBeans.size() > 0) {
            bean = baBeans.get(0);
            return bean;
        }
        else {
            throw new JPAExecutorException(ErrorCode.E0605, bundleActionId);
        }
    }
}