content: /*
   * Copyright 2010-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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.el;
  
  import static java.util.Collections.emptyMap;
  import static java.util.Collections.emptySet;
  
  import java.util.Collection;
  import java.util.Map;
  import java.util.Set;
  import org.activiti.engine.delegate.VariableScope;
  import org.activiti.engine.impl.persistence.entity.VariableInstance;
  
  /**
   * Variable-scope only used to resolve variables when NO execution is active but expression-resolving is needed. This occurs eg. when start-form properties have default's defined. Even though
   * variables are not available yet, expressions should be resolved anyway.
   *
   */
  public class NoExecutionVariableScope implements VariableScope {
  
      private static final NoExecutionVariableScope INSTANCE = new NoExecutionVariableScope();
  
      /**
       * Since a {@link NoExecutionVariableScope} has no state, it's safe to use the same instance to prevent too many useless instances created.
       */
      public static NoExecutionVariableScope getSharedInstance() {
          return INSTANCE;
      }
  
      public Map<String, Object> getVariables() {
          return emptyMap();
      }
  
      public Map<String, Object> getVariablesLocal() {
          return emptyMap();
      }
  
      @Override
      public Map<String, Object> getVariables(Collection<String> variableNames) {
          return emptyMap();
      }
  
      @Override
      public Map<String, Object> getVariables(Collection<String> variableNames, boolean fetchAllVariables) {
          return emptyMap();
      }
  
      @Override
      public Map<String, Object> getVariablesLocal(Collection<String> variableNames) {
          return emptyMap();
      }
  
      @Override
      public Map<String, Object> getVariablesLocal(Collection<String> variableNames, boolean fetchAllVariables) {
          return emptyMap();
      }
  
      public Object getVariable(String variableName) {
          return null;
      }
  
      @Override
      public Object getVariable(String variableName, boolean fetchAllVariables) {
          return null;
      }
  
      public Object getVariableLocal(String variableName) {
          return null;
      }
  
      @Override
      public Object getVariableLocal(String variableName, boolean fetchAllVariables) {
          return null;
      }
  
      @Override
      public <T> T getVariable(String variableName, Class<T> variableClass) {
          return null;
      }
  
      @Override
      public <T> T getVariableLocal(String variableName, Class<T> variableClass) {
          return null;
      }
  
      @Override
      public Map<String, VariableInstance> getVariableInstances() {
          return null;
      }
  
      @Override
      public Map<String, VariableInstance> getVariableInstances(Collection<String> variableNames) {
          return null;
      }
  
      @Override
      public Map<String, VariableInstance> getVariableInstances(
          Collection<String> variableNames,
          boolean fetchAllVariables
      ) {
          return null;
      }
  
      @Override
      public Map<String, VariableInstance> getVariableInstancesLocal() {
          return null;
      }
  
      @Override
      public Map<String, VariableInstance> getVariableInstancesLocal(Collection<String> variableNames) {
          return null;
      }
  
      @Override
      public Map<String, VariableInstance> getVariableInstancesLocal(
          Collection<String> variableNames,
          boolean fetchAllVariables
      ) {
          return null;
      }
  
      @Override
      public VariableInstance getVariableInstance(String variableName) {
          return null;
      }
  
      @Override
      public VariableInstance getVariableInstance(String variableName, boolean fetchAllVariables) {
          return null;
      }
  
      @Override
      public VariableInstance getVariableInstanceLocal(String variableName) {
          return null;
      }
  
      @Override
      public VariableInstance getVariableInstanceLocal(String variableName, boolean fetchAllVariables) {
          return null;
      }
  
      public Set<String> getVariableNames() {
          return emptySet();
      }
  
      public Set<String> getVariableNamesLocal() {
          return null;
      }
  
      public void setVariable(String variableName, Object value) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      @Override
      public void setVariable(String variableName, Object value, boolean fetchAllVariables) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      public Object setVariableLocal(String variableName, Object value) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      @Override
      public Object setVariableLocal(String variableName, Object value, boolean fetchAllVariables) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      public void setVariables(Map<String, ? extends Object> variables) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      public void setVariablesLocal(Map<String, ? extends Object> variables) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      public boolean hasVariables() {
          return false;
      }
  
      public boolean hasVariablesLocal() {
          return false;
      }
  
      public boolean hasVariable(String variableName) {
          return false;
      }
  
      public boolean hasVariableLocal(String variableName) {
          return false;
      }
  
      public void createVariableLocal(String variableName, Object value) {
          throw new UnsupportedOperationException("No execution active, no variables can be created");
      }
  
      public void createVariablesLocal(Map<String, ? extends Object> variables) {
          throw new UnsupportedOperationException("No execution active, no variables can be created");
      }
  
      public void removeVariable(String variableName) {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  
      public void removeVariableLocal(String variableName) {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  
      public void removeVariables() {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  
      public void removeVariablesLocal() {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  
      public void removeVariables(Collection<String> variableNames) {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  
      public void removeVariablesLocal(Collection<String> variableNames) {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  
      public void setTransientVariablesLocal(Map<String, Object> transientVariables) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      public void setTransientVariableLocal(String variableName, Object variableValue) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      public void setTransientVariables(Map<String, Object> transientVariables) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      public void setTransientVariable(String variableName, Object variableValue) {
          throw new UnsupportedOperationException("No execution active, no variables can be set");
      }
  
      public Object getTransientVariableLocal(String variableName) {
          return null;
      }
  
      public Map<String, Object> getTransientVariablesLocal() {
          return null;
      }
  
      public Object getTransientVariable(String variableName) {
          return null;
      }
  
      public Map<String, Object> getTransientVariables() {
          return null;
      }
  
      public void removeTransientVariableLocal(String variableName) {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  
      public void removeTransientVariablesLocal() {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  
      public void removeTransientVariable(String variableName) {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  
      public void removeTransientVariables() {
          throw new UnsupportedOperationException("No execution active, no variables can be removed");
      }
  }
  