ASTLENode.java

/*
 * Copyright 2014 mango.jfaster.org
 *
 * The Mango Project 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.jfaster.mango.parser;

import org.jfaster.mango.binding.InvocationContext;

public class ASTLENode extends AbstractExpression {

  public ASTLENode(int id) {
    super(id);
  }

  public ASTLENode(Parser p, int id) {
    super(p, id);
  }

  @Override
  public boolean evaluate(InvocationContext context) {
    Object left = ((AbstractExpression) jjtGetChild(0)).value(context);
    Object right = ((AbstractExpression) jjtGetChild(1)).value(context);
    if (!(left instanceof Number)) {
      throw new ClassCastException(left.getClass() + " cannot be cast to " + Number.class);
    } else if (!(right instanceof Number)) {
      throw new ClassCastException(right.getClass() + " cannot be cast to " + Number.class);
    } else {
      return MathUtils.compare((Number) left, (Number) right) <= 0;
    }
  }

  @Override
  public Object value(InvocationContext context) {
    return evaluate(context) ? Boolean.TRUE : Boolean.FALSE;
  }

  @Override
  public Object jjtAccept(ParserVisitor visitor, Object data) {
    return visitor.visit(this, data);
  }

}