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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * 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.mvel2.ast;

import org.mvel2.CompileException;
import org.mvel2.ParserContext;
import org.mvel2.integration.VariableResolverFactory;

import static org.mvel2.MVEL.executeSetExpression;

/**
 * @author Christopher Brock
 */
public class ThisWithNode extends WithNode {

  public ThisWithNode(char[] expr, int start, int offset, int blockStart, int blockOffset, int fields, ParserContext pCtx) {
    super(expr, start, offset, blockStart, blockOffset, fields, pCtx);
  }

  public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
    if (thisValue == null) throw new CompileException("with-block against null pointer (this)", expr, start);

    for (ParmValuePair pvp : withExpressions) {
      if (pvp.getSetExpression() != null) {
        executeSetExpression(pvp.getSetExpression(), thisValue, factory, pvp.getStatement().getValue(ctx, thisValue, factory));
      }
      else {
        pvp.getStatement().getValue(thisValue, thisValue, factory);
      }
    }
    return thisValue;
  }


  public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
    return getReducedValueAccelerated(ctx, thisValue, factory);
  }
}