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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.flowable.engine.delegate;

import org.flowable.bpmn.model.FlowElement;
import org.flowable.common.engine.api.variable.VariableContainer;

/**
 * @author Filip Hrisafov
 */
public interface ReadOnlyDelegateExecution extends VariableContainer {

    /**
     * Unique id of this path of execution that can be used as a handle to provide external signals back into the engine after wait states.
     */
    String getId();

    /**
     * Reference to the overall process instance
     */
    String getProcessInstanceId();

    /**
     * The 'root' process instance. When using call activity for example, the processInstance set will not always be the root. This method returns the topmost process instance.
     */
    String getRootProcessInstanceId();

    /**
     * Will contain the event name in case this execution is passed in for an {@link ExecutionListener}.
     */
    String getEventName();

    /**
     * The business key for the process instance this execution is associated with.
     */
    String getProcessInstanceBusinessKey();

    /**
     * The process definition key for the process instance this execution is associated with.
     */
    String getProcessDefinitionId();

    /**
     * If this execution runs in the context of a case and stage, this method returns it's closest parent stage instance id (the stage plan item instance id to be
     * precise).
     *
     * @return the stage instance id this execution belongs to or null, if this execution is not part of a case at all or is not a child element of a stage
     */
    String getPropagatedStageInstanceId();

    /**
     * Gets the id of the parent of this execution. If null, the execution represents a process-instance.
     */
    String getParentId();

    /**
     * Gets the id of the calling execution. If not null, the execution is part of a subprocess.
     */
    String getSuperExecutionId();

    /**
     * Gets the id of the current activity.
     */
    String getCurrentActivityId();

    /**
     * The BPMN element where the execution currently is at.
     */
    FlowElement getCurrentFlowElement();

    /* State management */

    /**
     * returns whether this execution is currently active.
     */
    boolean isActive();

    /**
     * returns whether this execution has ended or not.
     */
    boolean isEnded();

    /**
     * returns whether this execution is concurrent or not.
     */
    boolean isConcurrent();

    /**
     * returns whether this execution is a process instance or not.
     */
    boolean isProcessInstanceType();

    /**
     * Returns whether this execution is a scope.
     */
    boolean isScope();

    /**
     * Returns whether this execution is the root of a multi instance execution.
     */
    boolean isMultiInstanceRoot();

    @Override
    default void setVariable(String variableName, Object variableValue) {
        throw new UnsupportedOperationException("Setting variable is not supported for read only delegate execution");
    }

    @Override
    default void setTransientVariable(String variableName, Object variableValue) {
        throw new UnsupportedOperationException("Setting transient variable is not supported for read only delegate execution");
    }
}




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