/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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.apache.commons.jexl2.introspection;
  
  import org.apache.commons.jexl2.JexlInfo;
  import org.apache.commons.logging.Log;
  
  /**
   * An uberspect that controls usage of properties, methods and contructors through a sandbox.
   * @since 2.1
   */
  public class SandboxUberspectImpl extends UberspectImpl {
      /**  The sandbox. */
      protected final Sandbox sandbox;
  
      /**
       * A constructor for Sandbox uberspect.
       * @param runtimeLogger the logger to use or null to use default
       * @param theSandbox the sandbox instance to use
       */
      public SandboxUberspectImpl(Log runtimeLogger, Sandbox theSandbox) {
          super(runtimeLogger);
          if (theSandbox == null) {
              throw new NullPointerException("sandbox can not be null");
          }
          this.sandbox = theSandbox;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void setLoader(ClassLoader cloader) {
          base().setLoader(cloader);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public JexlMethod getConstructorMethod(Object ctorHandle, Object[] args, JexlInfo info) {
          final String className;
          if (ctorHandle instanceof Class<?>) {
              Class<?> clazz = (Class<?>) ctorHandle;
              className = clazz.getName();
          } else if (ctorHandle != null) {
              className = ctorHandle.toString();
          } else {
              return null;
          }
          if (sandbox.execute(className, "") != null) {
              return super.getConstructorMethod(className, args, info);
          }
          return null;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public JexlMethod getMethod(Object obj, String method, Object[] args, JexlInfo info) {
          if (obj != null && method != null) {
              String actual = sandbox.execute(obj.getClass().getName(), method);
              if (actual != null) {
                  return getMethodExecutor(obj, actual, args);
              }
          }
          return null;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public JexlPropertyGet getPropertyGet(Object obj, Object identifier, JexlInfo info) {
          if (obj != null && identifier != null) {
              String actual = sandbox.read(obj.getClass().getName(), identifier.toString());
              if (actual != null) {
                  return super.getPropertyGet(obj, actual, info);
              }
          }
          return null;
      }
  
      /**
      * {@inheritDoc}
      */
     @Override
     public JexlPropertySet getPropertySet(final Object obj, final Object identifier, Object arg, JexlInfo info) {
         if (obj != null && identifier != null) {
             String actual = sandbox.write(obj.getClass().getName(), identifier.toString());
             if (actual != null) {
                 return super.getPropertySet(obj, actual, arg, info);
             }
         }
         return null;
 
     }
 }