/**
 * 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 javax.persistence.EntityManager;

import org.apache.oozie.ErrorCode;
import org.apache.oozie.WorkflowActionBean;
import org.apache.oozie.WorkflowJobBean;
import org.apache.oozie.command.CommandException;
import org.apache.oozie.service.JPAService;
import org.apache.oozie.service.Services;
import org.apache.oozie.util.ParamChecker;

/**
 * This JPA Executor is responsible for getting the Workflow job with actions in certain range.
 */
public class WorkflowInfoWithActionsSubsetGetJPAExecutor implements JPAExecutor<WorkflowJobBean> {

    private String wfJobId = null;
    private WorkflowJobBean workflow;
    private final int start;
    private final int len;

    /**
     * This will create the WorkflowInfoWithActionsSubsetGetJPAExecutor object. which is responsible for getting the
     * Workflow job with actions in certain range.
     * 
     * @param wfJobId
     * @param start
     * @param len
     */
    public WorkflowInfoWithActionsSubsetGetJPAExecutor(String wfJobId, int start, int len) {
        ParamChecker.notNull(wfJobId, "wfJobId");
        this.wfJobId = wfJobId;
        this.start = start;
        this.len = len;
    }

    /* (non-Javadoc)
     * @see org.apache.oozie.executor.jpa.JPAExecutor#execute(javax.persistence.EntityManager)
     */
    @Override
    public WorkflowJobBean execute(EntityManager em) throws JPAExecutorException {
        try {
            JPAService jpaService = Services.get().get(JPAService.class);
            if (jpaService != null) {
                this.workflow = jpaService.execute(new WorkflowJobGetJPAExecutor(this.wfJobId));
            }
            else {
                throw new JPAExecutorException(ErrorCode.E0610, this.wfJobId);
            }
        }
        catch (Exception ex) {
            if (ex instanceof JPAExecutorException) {
                throw (JPAExecutorException) ex;
            }
            else {
                throw new JPAExecutorException(ErrorCode.E0603, ex);
            }
        }

        if (this.workflow != null) {
            JPAService jpaService = Services.get().get(JPAService.class);
            List<WorkflowActionBean> actionList;
            if (jpaService != null) {
                actionList = jpaService.execute(new WorkflowActionSubsetGetJPAExecutor(this.wfJobId, start, len));
            }
            else {
                throw new JPAExecutorException(ErrorCode.E0610, this.wfJobId);
            }
            this.workflow.setActions(actionList);
        }
        else {
            throw new JPAExecutorException(ErrorCode.E0604, wfJobId);
        }

        return this.workflow;
    }

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