| /* |
| * 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.function; |
| |
| import java.math.BigDecimal; |
| import java.math.RoundingMode; |
| import java.sql.SQLException; |
| import java.util.List; |
| |
| import org.apache.phoenix.expression.Determinism; |
| import org.apache.phoenix.expression.Expression; |
| import org.apache.phoenix.expression.LiteralExpression; |
| import org.apache.phoenix.query.KeyRange; |
| import org.apache.phoenix.schema.types.PDecimal; |
| import org.apache.phoenix.schema.types.PInteger; |
| import org.apache.phoenix.schema.types.PLong; |
| import org.apache.phoenix.schema.types.PVarchar; |
| import org.apache.phoenix.schema.types.PDecimal; |
| import org.apache.phoenix.parse.FunctionParseNode.BuiltInFunction; |
| import org.apache.phoenix.parse.FunctionParseNode.Argument; |
| import org.apache.phoenix.parse.FunctionParseNode.FunctionClassType; |
| |
| import org.apache.phoenix.thirdparty.com.google.common.collect.Lists; |
| |
| /** |
| * |
| * Class encapsulating the FLOOR operation on |
| * a column/literal of type {@link org.apache.phoenix.schema.types.PDecimal}. |
| * |
| * |
| * @since 3.0.0 |
| */ |
| @BuiltInFunction(name = FloorFunction.NAME, |
| args = { |
| @Argument(allowedTypes={PDecimal.class}), |
| @Argument(allowedTypes={PVarchar.class, PInteger.class}, defaultValue = "null", isConstant=true), |
| @Argument(allowedTypes={PInteger.class}, defaultValue="1", isConstant=true) |
| }, |
| classType = FunctionClassType.DERIVED |
| ) |
| public class FloorDecimalExpression extends RoundDecimalExpression { |
| |
| public FloorDecimalExpression() {} |
| |
| public FloorDecimalExpression(List<Expression> children) { |
| super(children); |
| } |
| |
| /** |
| * Creates a {@link FloorDecimalExpression} with rounding scale given by @param scale. |
| * |
| */ |
| public static Expression create(Expression expr, int scale) throws SQLException { |
| if (expr.getDataType().isCoercibleTo(PLong.INSTANCE)) { |
| return expr; |
| } |
| Expression scaleExpr = LiteralExpression.newConstant(scale, PInteger.INSTANCE, Determinism.ALWAYS); |
| List<Expression> expressions = Lists.newArrayList(expr, scaleExpr); |
| return new FloorDecimalExpression(expressions); |
| } |
| |
| public static Expression create(List<Expression> exprs) throws SQLException { |
| Expression expr = exprs.get(0); |
| if (expr.getDataType().isCoercibleTo(PLong.INSTANCE)) { |
| return expr; |
| } |
| if (exprs.size() == 1) { |
| Expression scaleExpr = LiteralExpression.newConstant(0, PInteger.INSTANCE, Determinism.ALWAYS); |
| exprs = Lists.newArrayList(expr, scaleExpr); |
| } |
| return new FloorDecimalExpression(exprs); |
| } |
| |
| /** |
| * Creates a {@link FloorDecimalExpression} with a default scale of 0 used for rounding. |
| * |
| */ |
| public static Expression create(Expression expr) throws SQLException { |
| return create(expr, 0); |
| } |
| |
| @Override |
| protected RoundingMode getRoundingMode() { |
| return RoundingMode.FLOOR; |
| } |
| |
| @Override |
| public String getName() { |
| return FloorFunction.NAME; |
| } |
| |
| /** |
| * {@inheritDoc } |
| */ |
| @Override |
| protected KeyRange getInputRangeProducing(BigDecimal result) { |
| if(!hasEnoughPrecisionToProduce(result)) { |
| throw new IllegalArgumentException("Cannot produce input range for decimal " + result |
| + ", not enough precision with scale " + getRoundingScale()); |
| } |
| byte[] lowerRange = PDecimal.INSTANCE.toBytes(result); |
| byte[] upperRange = PDecimal.INSTANCE.toBytes(stepNextInScale(result)); |
| return KeyRange.getKeyRange(lowerRange, upperRange); |
| } |
| |
| } |