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The ZEL language, a simple language with concurency facilities, mathematical operations...

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/*
 * 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 edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.util.concurrent.ExecutionException;
import org.spf4j.base.Arrays;
import org.spf4j.zel.vm.ExecutionContext;
import org.spf4j.zel.vm.AssignableValue;
import org.spf4j.zel.vm.ZExecutionException;

public final class MOV extends Instruction {

  private static final long serialVersionUID = 1L;

  public static final Instruction INSTANCE = new MOV();

  private MOV() {
  }

  @Override
  @SuppressFBWarnings("BAS_BLOATED_ASSIGNMENT_SCOPE")
  public int execute(final ExecutionContext context)
          throws ExecutionException, InterruptedException {
    Object what = context.pop();
    Object to = context.pop();
    if (to instanceof AssignableValue) {
      AssignableValue assignTo = (AssignableValue) to;
      assignTo.assign(what);
      context.push(what);
    } else {
      throw new ZExecutionException("Lvalue expected insted of " + to);
    }
    return 1;
  }

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