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.scripting;
  
  import static java.util.Arrays.asList;
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import javax.script.Bindings;
  import javax.script.SimpleScriptContext;
  import org.activiti.engine.delegate.VariableScope;
  
  /**
   */
  public class ScriptBindings implements Bindings {
  
      /**
       * The script engine implementations put some key/value pairs into the binding.
       * This list contains those keys, such that they wouldn't be stored as process variable.
       *
       * This list contains the keywords for JUEL, Javascript and Groovy.
       */
      protected static final Set<String> UNSTORED_KEYS = new HashSet<String>(
          asList("out", "out:print", "lang:import", "context", "elcontext", "print", "println", "nashorn.global")
      );
  
      protected List<Resolver> scriptResolvers;
      protected VariableScope variableScope;
      protected Bindings defaultBindings;
      protected boolean storeScriptVariables = true; // By default everything is stored (backwards compatibility)
  
      public ScriptBindings(List<Resolver> scriptResolvers, VariableScope variableScope) {
          this.scriptResolvers = scriptResolvers;
          this.variableScope = variableScope;
          this.defaultBindings = new SimpleScriptContext().getBindings(SimpleScriptContext.ENGINE_SCOPE);
      }
  
      public ScriptBindings(List<Resolver> scriptResolvers, VariableScope variableScope, boolean storeScriptVariables) {
          this(scriptResolvers, variableScope);
          this.storeScriptVariables = storeScriptVariables;
      }
  
      public boolean containsKey(Object key) {
          for (Resolver scriptResolver : scriptResolvers) {
              if (scriptResolver.containsKey(key)) {
                  return true;
              }
          }
          return defaultBindings.containsKey(key);
      }
  
      public Object get(Object key) {
          for (Resolver scriptResolver : scriptResolvers) {
              if (scriptResolver.containsKey(key)) {
                  return scriptResolver.get(key);
              }
          }
          return defaultBindings.get(key);
      }
  
      public Object put(String name, Object value) {
          if (storeScriptVariables) {
              Object oldValue = null;
              if (!UNSTORED_KEYS.contains(name)) {
                  oldValue = variableScope.getVariable(name);
                  variableScope.setVariable(name, value);
                  return oldValue;
              }
          }
          return defaultBindings.put(name, value);
      }
  
      public Set<Map.Entry<String, Object>> entrySet() {
          return variableScope.getVariables().entrySet();
      }
  
      public Set<String> keySet() {
          return variableScope.getVariables().keySet();
      }
  
      public int size() {
          return variableScope.getVariables().size();
      }
  
      public Collection<Object> values() {
          return variableScope.getVariables().values();
      }
  
      public void putAll(Map<? extends String, ? extends Object> toMerge) {
          throw new UnsupportedOperationException();
      }
  
      public Object remove(Object key) {
          if (UNSTORED_KEYS.contains(key)) {
              return null;
          }
          return defaultBindings.remove(key);
      }
  
      public void clear() {
          throw new UnsupportedOperationException();
      }
  
      public boolean containsValue(Object value) {
          throw new UnsupportedOperationException();
      }
  
      public boolean isEmpty() {
          throw new UnsupportedOperationException();
      }
  
      public void addUnstoredKey(String unstoredKey) {
          UNSTORED_KEYS.add(unstoredKey);
      }
  }
  