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.core.el.juel.util;
  
  import jakarta.el.ELContext;
  import jakarta.el.ELResolver;
  import jakarta.el.FunctionMapper;
  import jakarta.el.ValueExpression;
  import jakarta.el.VariableMapper;
  import java.lang.reflect.Method;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Simple context implementation.
   *
   * @author Christoph Beck
   */
  public class SimpleContext extends ELContext {
  
      static class Functions extends FunctionMapper {
  
          Map<String, Method> map = Collections.emptyMap();
  
          @Override
          public Method resolveFunction(String prefix, String localName) {
              return map.get(prefix + ":" + localName);
          }
  
          public void setFunction(String prefix, String localName, Method method) {
              if (map.isEmpty()) {
                  map = new HashMap<String, Method>();
              }
              map.put(prefix + ":" + localName, method);
          }
      }
  
      static class Variables extends VariableMapper {
  
          Map<String, ValueExpression> map = Collections.emptyMap();
  
          @Override
          public ValueExpression resolveVariable(String variable) {
              return map.get(variable);
          }
  
          @Override
          public ValueExpression setVariable(String variable, ValueExpression expression) {
              if (map.isEmpty()) {
                  map = new HashMap<String, ValueExpression>();
              }
              return map.put(variable, expression);
          }
      }
  
      private Functions functions;
      private Variables variables;
      private ELResolver resolver;
  
      /**
       * Create a context.
       */
      public SimpleContext() {
          this(null);
      }
  
      /**
       * Create a context, use the specified resolver.
       */
      public SimpleContext(ELResolver resolver) {
          this.resolver = resolver;
      }
  
      /**
       * Define a function.
       */
      public void setFunction(String prefix, String localName, Method method) {
          if (functions == null) {
              functions = new Functions();
          }
          functions.setFunction(prefix, localName, method);
      }
  
      /**
       * Define a variable.
       */
      public ValueExpression setVariable(String name, ValueExpression expression) {
          if (variables == null) {
              variables = new Variables();
          }
          return variables.setVariable(name, expression);
      }
  
      /**
       * Get our function mapper.
       */
      @Override
      public FunctionMapper getFunctionMapper() {
          if (functions == null) {
              functions = new Functions();
          }
          return functions;
      }
  
      /**
       * Get our variable mapper.
       */
      @Override
      public VariableMapper getVariableMapper() {
          if (variables == null) {
              variables = new Variables();
          }
          return variables;
      }
  
      /**
       * Get our resolver. Lazy initialize to a {@link SimpleResolver} if necessary.
       */
      @Override
      public ELResolver getELResolver() {
          if (resolver == null) {
              resolver = new SimpleResolver();
          }
          return resolver;
      }
  
      /**
       * Set our resolver.
       *
       * @param resolver
       */
      public void setELResolver(ELResolver resolver) {
          this.resolver = resolver;
      }
  }
  