/*
 * 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.phoenix.expression;

import java.util.List;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.phoenix.schema.tuple.Tuple;
import org.apache.phoenix.schema.types.PDataType;
import org.apache.phoenix.schema.types.PLong;

public class LongMultiplyExpression extends MultiplyExpression {

  public LongMultiplyExpression() {
  }

  public LongMultiplyExpression(List<Expression> children) {
    super(children);
  }

  @Override
  public boolean evaluate(Tuple tuple, ImmutableBytesWritable ptr) {
    long finalResult = 1;

    for (int i = 0; i < children.size(); i++) {
      Expression child = children.get(i);
      if (!child.evaluate(tuple, ptr)) {
        return false;
      }
      if (ptr.getLength() == 0) {
        return false;
      }
      long childvalue = child.getDataType().getCodec().decodeLong(ptr, child.getSortOrder());
      finalResult *= childvalue;
    }
    byte[] resultPtr = new byte[getDataType().getByteSize()];
    getDataType().getCodec().encodeLong(finalResult, resultPtr, 0);
    ptr.set(resultPtr);
    return true;
  }

  @Override
  public final PDataType getDataType() {
    return PLong.INSTANCE;
  }

  @Override
  public ArithmeticExpression clone(List<Expression> children) {
    return new LongMultiplyExpression(children);
  }

}
