/*
 * 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.instr;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.concurrent.ExecutionException;
import org.spf4j.base.Arrays;
import org.spf4j.zel.vm.ExecutionContext;
import org.spf4j.zel.vm.SuspendedException;

public final class ABS extends Instruction {

  private static final long serialVersionUID = 1L;

  public static final Instruction INSTANCE = new ABS();

  private ABS() {
  }

  @Override
  public int execute(final ExecutionContext context)
          throws ExecutionException, SuspendedException {
    Number nr = (Number) context.popSyncStackVal();
    if (nr instanceof Integer) {
      int integer = ((Integer) nr);
      if (integer < 0) {
        nr = -integer;
      }
    } else if (nr instanceof Long) {
      long val = ((Long) nr);
      if (val < 0) {
        nr = -val;
      }
    } else if (nr instanceof Double) {
      double val = ((Double) nr);
      if (val < 0) {
        nr = -val;
      }
    } else if (nr instanceof BigDecimal) {
      BigDecimal val = ((BigDecimal) nr);
      nr = val.abs();
    } else if (nr instanceof BigInteger) {
      BigInteger val = ((BigInteger) nr);
      nr = val.abs();
    }
    context.push(nr);
    return 1;
  }

  @Override
  public Object[] getParameters() {
    return Arrays.EMPTY_OBJ_ARRAY;
  }
}
