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 jakarta.el.ELContext;
  import jakarta.el.MethodNotFoundException;
  import jakarta.el.PropertyNotFoundException;
  import jakarta.el.ValueExpression;
  import java.util.Map;
  import org.activiti.engine.ActivitiException;
  import org.activiti.engine.delegate.Expression;
  import org.activiti.engine.delegate.VariableScope;
  import org.activiti.engine.impl.context.Context;
  import org.activiti.engine.impl.delegate.invocation.ExpressionGetInvocation;
  import org.activiti.engine.impl.delegate.invocation.ExpressionSetInvocation;
  import org.activiti.engine.impl.interceptor.DelegateInterceptor;
  
  /**
   * Expression implementation backed by a JUEL {@link ValueExpression}.
   *
  
  
   */
  public class JuelExpression implements Expression {
  
      private String expressionText;
      private ValueExpression valueExpression;
  
      public JuelExpression(ValueExpression valueExpression, String expressionText) {
          this.valueExpression = valueExpression;
          this.expressionText = expressionText;
      }
  
      @Override
      public Object getValue(VariableScope variableScope) {
          ELContext elContext = Context.getProcessEngineConfiguration()
              .getExpressionManager()
              .getElContext(variableScope);
          return getValueFromContext(elContext, Context.getProcessEngineConfiguration().getDelegateInterceptor());
      }
  
      @Override
      public void setValue(Object value, VariableScope variableScope) {
          ELContext elContext = Context.getProcessEngineConfiguration()
              .getExpressionManager()
              .getElContext(variableScope);
          try {
              ExpressionSetInvocation invocation = new ExpressionSetInvocation(valueExpression, elContext, value);
              Context.getProcessEngineConfiguration().getDelegateInterceptor().handleInvocation(invocation);
          } catch (Exception e) {
              throw new ActivitiException("Error while evaluating expression: " + expressionText, e);
          }
      }
  
      @Override
      public String toString() {
          if (valueExpression != null) {
              return valueExpression.getExpressionString();
          }
          return super.toString();
      }
  
      @Override
      public String getExpressionText() {
          return expressionText;
      }
  
      @Override
      public Object getValue(
          ExpressionManager expressionManager,
          DelegateInterceptor delegateInterceptor,
          Map<String, Object> availableVariables
      ) {
          ELContext elContext = expressionManager.getElContext(availableVariables);
          return getValueFromContext(elContext, delegateInterceptor);
      }
  
      private Object getValueFromContext(ELContext elContext, DelegateInterceptor delegateInterceptor) {
          try {
              ExpressionGetInvocation invocation = new ExpressionGetInvocation(valueExpression, elContext);
              delegateInterceptor.handleInvocation(invocation);
              return invocation.getInvocationResult();
          } catch (PropertyNotFoundException pnfe) {
              throw new ActivitiException("Unknown property used in expression: " + expressionText, pnfe);
          } catch (MethodNotFoundException mnfe) {
              throw new ActivitiException("Unknown method used in expression: " + expressionText, mnfe);
          } catch (Exception ele) {
              throw new ActivitiException("Error while evaluating expression: " + expressionText, ele);
          }
      }
  }
  