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/* 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.
 */

package org.activiti.engine.impl.cmd;

import java.io.Serializable;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.TaskEntity;
import org.activiti.engine.impl.persistence.entity.VariableInstance;
import org.activiti.engine.task.Task;

public class GetTaskVariableInstanceCmd implements Command, Serializable {

    private static final long serialVersionUID = 1L;
    protected String taskId;
    protected String variableName;
    protected boolean isLocal;

    public GetTaskVariableInstanceCmd(String taskId, String variableName, boolean isLocal) {
        this.taskId = taskId;
        this.variableName = variableName;
        this.isLocal = isLocal;
    }

    @Override
    public VariableInstance execute(CommandContext commandContext) {
        if (taskId == null) {
            throw new ActivitiIllegalArgumentException("taskId is null");
        }
        if (variableName == null) {
            throw new ActivitiIllegalArgumentException("variableName is null");
        }

        TaskEntity task = commandContext.getTaskEntityManager().findById(taskId);

        if (task == null) {
            throw new ActivitiObjectNotFoundException("task " + taskId + " doesn't exist", Task.class);
        }

        VariableInstance variableEntity;

        if (isLocal) {
            variableEntity = task.getVariableInstanceLocal(variableName, false);
        } else {
            variableEntity = task.getVariableInstance(variableName, false);
        }

        if (variableEntity != null) {
            variableEntity.getValue();
        }

        return variableEntity;
    }
}