AbstractOps.java

/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * 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.spf4j.zel.operators;

import java.util.HashMap;
import java.util.Map;

/**
 * @author zoly
 * @param <L> left operand type (ex: L <operator> Number = Number)
 */
abstract class AbstractOps<L> implements Operator<L, Number, Number> {

  //CHECKSTYLE:OFF
  protected final Map<Class, Operator<L, Number, Number>> operations;
  //CHECKSTYLE:ON

  AbstractOps() {
    operations = new HashMap<>();
  }

  @Override
  public Number op(final L a, final Number b) {
    final Operator<L, Number, Number> op = operations.get(b.getClass());
    if (op == null) {
      throw new UnsupportedOperationException("Not supporting " + this + " for " + a + " and " + b);
    }
    return op.op(a, b);
  }

}