| /* |
| * 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.sql.SQLException; |
| import java.util.List; |
| |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.phoenix.expression.Expression; |
| import org.apache.phoenix.schema.tuple.Tuple; |
| import org.apache.phoenix.schema.types.PDataType; |
| import org.apache.phoenix.schema.types.PDecimal; |
| import org.apache.phoenix.schema.types.PDouble; |
| |
| public abstract class JavaMathOneArgumentFunction extends ScalarFunction { |
| |
| public JavaMathOneArgumentFunction() { |
| } |
| |
| public JavaMathOneArgumentFunction(List<Expression> children) throws SQLException { |
| super(children); |
| } |
| |
| protected abstract double compute(double firstArg); |
| |
| static double getArg(Expression exp, ImmutableBytesWritable ptr) { |
| if (exp.getDataType() == PDecimal.INSTANCE) { |
| return ((BigDecimal) exp.getDataType().toObject(ptr, exp.getSortOrder())).doubleValue(); |
| } else { |
| return exp.getDataType().getCodec().decodeDouble(ptr, exp.getSortOrder()); |
| } |
| } |
| |
| @Override |
| public boolean evaluate(Tuple tuple, ImmutableBytesWritable ptr) { |
| PDataType returnType = getDataType(); |
| |
| Expression arg1Expr = children.get(0); |
| if (!arg1Expr.evaluate(tuple, ptr)) return false; |
| if (ptr.getLength() == 0) return true; |
| double arg1 = getArg(arg1Expr, ptr); |
| |
| ptr.set(new byte[returnType.getByteSize()]); |
| returnType.getCodec().encodeDouble(compute(arg1), ptr); |
| return true; |
| } |
| |
| @Override |
| public PDataType getDataType() { |
| return PDouble.INSTANCE; |
| } |
| } |