package org.apache.commons.ognl;
   
   /*
    * 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.
   */
  
  import org.apache.commons.ognl.enhance.UnsupportedCompilationException;
  
  /**
   * $Id: ASTEval.java 1235614 2012-01-25 03:31:12Z mcucchiara $
   * @author Luke Blanshard (blanshlu@netscape.net)
   * @author Drew Davidson (drew@ognl.org)
   */
  class ASTEval
      extends SimpleNode
  {
  
      public ASTEval( int id )
      {
          super( id );
      }
  
      public ASTEval( OgnlParser p, int id )
      {
          super( p, id );
      }
  
      protected Object getValueBody( OgnlContext context, Object source )
          throws OgnlException
      {
          Object result, expr = children[0].getValue( context, source ), previousRoot = context.getRoot();
          Node node;
  
          source = children[1].getValue( context, source );
          node = ( expr instanceof Node ) ? (Node) expr : (Node) Ognl.parseExpression( expr.toString() );
          try
          {
              context.setRoot( source );
              result = node.getValue( context, source );
          }
          finally
          {
              context.setRoot( previousRoot );
          }
          return result;
      }
  
      protected void setValueBody( OgnlContext context, Object target, Object value )
          throws OgnlException
      {
          Object expr = children[0].getValue( context, target ), previousRoot = context.getRoot();
          Node node;
  
          target = children[1].getValue( context, target );
          node = ( expr instanceof Node ) ? (Node) expr : (Node) Ognl.parseExpression( expr.toString() );
          try
          {
              context.setRoot( target );
              node.setValue( context, target, value );
          }
          finally
          {
              context.setRoot( previousRoot );
          }
      }
  
      public String toGetSourceString( OgnlContext context, Object target )
      {
          throw new UnsupportedCompilationException( "Eval expressions not supported as native java yet." );
      }
  
      public String toSetSourceString( OgnlContext context, Object target )
      {
          throw new UnsupportedCompilationException( "Map expressions not supported as native java yet." );
      }
      
      public <R, P> R accept( NodeVisitor<? extends R, ? super P> visitor, P data )
          throws OgnlException
      {
          return visitor.visit( this, data );
      }
  
      @Override
      public boolean isEvalChain( OgnlContext context )
         throws OgnlException
     {
         return true;
     }
 }