/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF 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.apache.geode.cache.query.internal;

import java.util.Collections;
import java.util.List;
import java.util.Set;

import org.apache.geode.cache.query.FunctionDomainException;
import org.apache.geode.cache.query.NameResolutionException;
import org.apache.geode.cache.query.QueryInvocationTargetException;
import org.apache.geode.cache.query.QueryService;
import org.apache.geode.cache.query.TypeMismatchException;

public class CompiledUnaryMinus extends AbstractCompiledValue {

  private final CompiledValue _value;

  public CompiledUnaryMinus(CompiledValue value) {
    _value = value;
  }


  @Override
  public List getChildren() {
    return Collections.singletonList(_value);
  }

  @Override
  public int getType() {
    return LITERAL_sum;
  }

  @Override
  public Object evaluate(ExecutionContext context) throws FunctionDomainException,
      TypeMismatchException, NameResolutionException, QueryInvocationTargetException {
    return minus(_value.evaluate(context));
  }

  @Override
  public Set computeDependencies(ExecutionContext context)
      throws TypeMismatchException, NameResolutionException {
    return context.addDependencies(this, _value.computeDependencies(context));
  }

  private Object minus(Object obj) throws TypeMismatchException {

    if (obj instanceof Number) {
      if (obj instanceof Integer) {
        return (Integer) obj * -1;
      }
      if (obj instanceof Long) {
        return (Long) obj * -1;
      }
      if (obj instanceof Double) {
        return (Double) obj * -1;
      }
      if (obj instanceof Float) {
        return (Float) obj * -1;
      }
      if (obj instanceof Byte) {
        return (byte) ((Byte) obj * -1);
      }
      if (obj instanceof Short) {
        return (short) ((Short) obj * -1);
      }
    } else if (obj == null || obj == QueryService.UNDEFINED) {
      return QueryService.UNDEFINED;
    }
    throw new TypeMismatchException(String.format("%s cannot be unary minus",
        obj.getClass()));
  }

}
