/*
 * 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.phoenix.schema.types.PDataType;

public abstract class ArithmeticExpression extends BaseCompoundExpression {

  public ArithmeticExpression() {
  }

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

  abstract public ArithmeticExpression clone(List<Expression> children);

  @Override
  public String toString() {
    StringBuilder buf = new StringBuilder("(");
    for (int i = 0; i < children.size() - 1; i++) {
      buf.append(children.get(i) + getOperatorString());
    }
    buf.append(children.get(children.size() - 1));
    buf.append(')');
    return buf.toString();
  }

  protected Integer getScale(Expression e) {
    Integer scale = e.getScale();
    if (scale != null) {
      return scale;
    }
    PDataType dataType = e.getDataType();
    if (dataType != null) {
      scale = dataType.getScale(null);
      if (scale != null) {
        return scale;
      }
    }
    return null;
  }

  protected int getPrecision(Expression e) {
    Integer precision = e.getMaxLength();
    if (precision != null) {
      return precision;
    }
    PDataType dataType = e.getDataType();
    if (dataType != null) {
      precision = dataType.getMaxLength(null);
      if (precision != null) {
        return precision;
      }
    }
    return PDataType.MAX_PRECISION;
  }

  abstract protected String getOperatorString();
}
