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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.templates.res;

import org.mvel2.MVEL;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.templates.TemplateRuntime;
import org.mvel2.templates.util.TemplateOutputStream;
import org.mvel2.util.ParseTools;

public class IfNode extends Node {
  protected Node trueNode;
  protected Node elseNode;

  public IfNode(int begin, String name, char[] template, int start, int end) {
    super(begin, name, template, start, end);
    while (cEnd > cStart && ParseTools.isWhitespace(template[cEnd])) cEnd--;
  }

  public Node getTrueNode() {
    return trueNode;
  }

  public void setTrueNode(ExpressionNode trueNode) {
    this.trueNode = trueNode;
  }

  public Node getElseNode() {
    return elseNode;
  }

  public void setElseNode(ExpressionNode elseNode) {
    this.elseNode = elseNode;
  }

  public boolean demarcate(Node terminatingNode, char[] template) {
    trueNode = next;
    next = terminus;
    return true;
  }

  public Object eval(TemplateRuntime runtime, TemplateOutputStream appender, Object ctx, VariableResolverFactory factory) {
    if (cEnd == cStart || MVEL.eval(contents, cStart, cEnd - cStart, ctx, factory, Boolean.class)) {
      return trueNode.eval(runtime, appender, ctx, factory);
    }
    return next != null ? next.eval(runtime, appender, ctx, factory) : null;
  }
}