/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.oozie.executor.jpa;

import java.util.List;
import java.util.Objects;

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

import org.apache.oozie.ErrorCode;
import org.apache.oozie.WorkflowActionBean;
import org.apache.oozie.util.XLog;

/**
 * Load the WorkflowAction into a Bean and return it.
 */
public class WorkflowActionGetJPAExecutor implements JPAExecutor<WorkflowActionBean> {

    public XLog LOG = XLog.getLog(getClass());

    private String wfActionId = null;
    private final boolean isNullAcceptable;

    public WorkflowActionGetJPAExecutor(String wfActionId) {
        this(wfActionId, false);
    }

    public WorkflowActionGetJPAExecutor(String wfActionId, boolean isNullAcceptable) {
        this.wfActionId = Objects.requireNonNull(wfActionId, "wfActionId cannot be null");
        this.isNullAcceptable = isNullAcceptable;
    }

    @Override
    public String getName() {
        return "WorkflowActionGetJPAExecutor";
    }

    @Override
    @SuppressWarnings("unchecked")
    public WorkflowActionBean execute(EntityManager em) throws JPAExecutorException {
        List<WorkflowActionBean> waBeans;
        try {
            Query q = em.createNamedQuery("GET_ACTION");
            q.setParameter("id", wfActionId);
            waBeans = q.getResultList();
        }
        catch (Exception e) {
            throw new JPAExecutorException(ErrorCode.E0603, e.getMessage(), e);
        }
        WorkflowActionBean bean = null;
        if (waBeans != null && waBeans.size() > 0) {
            bean = waBeans.get(0);
            return bean;
        }
        else {
            if (isNullAcceptable) {
                LOG.warn("Could not get workflow action {0}", wfActionId);
                return null;
            }
            else {
                throw new JPAExecutorException(ErrorCode.E0605, wfActionId);
            }
        }
    }
}