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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.MVEL;
import org.mvel2.ParserContext;
import org.mvel2.compiler.ExecutableStatement;
import org.mvel2.integration.VariableResolverFactory;

import static org.mvel2.util.ParseTools.subCompileExpression;

/**
 * @author Christopher Brock
 */
public class AssertNode extends ASTNode {
  public ExecutableStatement assertion;
  public ExecutableStatement fail;

  public AssertNode(char[] expr, int start, int offset, int fields, ParserContext pCtx) {
    super(pCtx);
    this.expr = expr;
    this.start = start;
    this.offset = offset;

    if ((fields & COMPILE_IMMEDIATE) != 0) {
      assertion = (ExecutableStatement) subCompileExpression(expr, start, offset, pCtx);
    }
  }

  public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
    try {
      if (!((Boolean) assertion.getValue(ctx, thisValue, factory))) {
        throw new AssertionError("assertion failed in expression: " + new String(this.expr, start, offset));
      }
      else {
        return true;
      }
    }
    catch (ClassCastException e) {
      throw new CompileException("assertion does not contain a boolean statement", expr, start);
    }
  }

  public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
    try {
      if (!((Boolean) MVEL.eval(this.expr, ctx, factory))) {
        throw new AssertionError("assertion failed in expression: " + new String(this.expr, start, offset));
      }
      else {
        return true;
      }
    }
    catch (ClassCastException e) {
      throw new CompileException("assertion does not contain a boolean statement", expr, start);
    }
  }
}