| /* |
| * 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.expression.visitor.ExpressionVisitor; |
| import org.apache.phoenix.schema.types.PDataType; |
| |
| |
| /** |
| * |
| * Divide expression implementation |
| * |
| * |
| * @since 0.1 |
| */ |
| public abstract class DivideExpression extends ArithmeticExpression { |
| private Integer maxLength; |
| private Integer scale; |
| |
| public DivideExpression() { |
| } |
| |
| public DivideExpression(List<Expression> children) { |
| super(children); |
| Expression firstChild = children.get(0); |
| maxLength = getPrecision(firstChild); |
| scale = getScale(firstChild); |
| for (int i=1; i<children.size(); i++) { |
| Expression childExpr = children.get(i); |
| maxLength = getPrecision(maxLength, getPrecision(childExpr), scale, getScale(childExpr)); |
| scale = getScale(maxLength, getPrecision(childExpr), scale, getScale(childExpr)); |
| } |
| } |
| |
| @Override |
| public final <T> T accept(ExpressionVisitor<T> visitor) { |
| List<T> l = acceptChildren(visitor, visitor.visitEnter(this)); |
| T t = visitor.visitLeave(this, l); |
| if (t == null) { |
| t = visitor.defaultReturn(this, l); |
| } |
| return t; |
| } |
| |
| @Override |
| public String getOperatorString() { |
| return " / "; |
| } |
| |
| private static Integer getPrecision(Integer lp, Integer rp, Integer ls, Integer rs) { |
| if (ls == null || rs == null) { |
| return PDataType.MAX_PRECISION; |
| } |
| int val = getScale(lp, rp, ls, rs) + lp - ls + rp; |
| return Math.min(PDataType.MAX_PRECISION, val); |
| } |
| |
| private static Integer getScale(Integer lp, Integer rp, Integer ls, Integer rs) { |
| // If we are adding a decimal with scale and precision to a decimal |
| // with no precision nor scale, the scale system does not apply. |
| if (ls == null || rs == null) { |
| return null; |
| } |
| int val = Math.max(PDataType.MAX_PRECISION - lp + ls - rs, 0); |
| return Math.min(PDataType.MAX_PRECISION, val); |
| } |
| |
| |
| @Override |
| public Integer getScale() { |
| return scale; |
| } |
| |
| @Override |
| public Integer getMaxLength() { |
| return maxLength; |
| } |
| } |