| /* |
| * 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.parse; |
| |
| import java.sql.SQLException; |
| import java.util.List; |
| |
| import org.apache.phoenix.compile.StatementContext; |
| import org.apache.phoenix.expression.Expression; |
| import org.apache.phoenix.expression.function.RoundDateExpression; |
| import org.apache.phoenix.expression.function.RoundDecimalExpression; |
| import org.apache.phoenix.expression.function.RoundFunction; |
| import org.apache.phoenix.expression.function.RoundTimestampExpression; |
| import org.apache.phoenix.schema.types.PDate; |
| import org.apache.phoenix.schema.types.PDecimal; |
| import org.apache.phoenix.schema.types.PDataType; |
| import org.apache.phoenix.schema.types.PTimestamp; |
| import org.apache.phoenix.schema.TypeMismatchException; |
| |
| /** |
| * |
| * Parse node corresponding to {@link RoundFunction}. |
| * It also acts as a factory for creating the right kind of |
| * round expression according to the data type of the |
| * first child. |
| * |
| * |
| * @since 3.0.0 |
| */ |
| public class RoundParseNode extends FunctionParseNode { |
| |
| RoundParseNode(String name, List<ParseNode> children, BuiltInFunctionInfo info) { |
| super(name, children, info); |
| } |
| |
| @Override |
| public Expression create(List<Expression> children, StatementContext context) throws SQLException { |
| return getRoundExpression(children); |
| } |
| |
| public static Expression getRoundExpression(List<Expression> children) throws SQLException { |
| final Expression firstChild = children.get(0); |
| final PDataType firstChildDataType = firstChild.getDataType(); |
| |
| if(firstChildDataType.isCoercibleTo(PDate.INSTANCE)) { |
| return RoundDateExpression.create(children); |
| } else if (firstChildDataType.isCoercibleTo(PTimestamp.INSTANCE)) { |
| return RoundTimestampExpression.create(children); |
| } else if(firstChildDataType.isCoercibleTo(PDecimal.INSTANCE)) { |
| return RoundDecimalExpression.create(children); |
| } else { |
| throw TypeMismatchException.newException(firstChildDataType, "1"); |
| } |
| } |
| |
| /** |
| * When rounding off decimals, user need not specify the scale. In such cases, |
| * we need to prevent the function from getting evaluated as null. This is really |
| * a hack. A better way would have been if {@link org.apache.phoenix.parse.FunctionParseNode.BuiltInFunctionInfo} provided a |
| * way of associating default values for each permissible data type. |
| * Something like: @ Argument(allowedTypes={PDataType.VARCHAR, PDataType.INTEGER}, defaultValues = {"null", "1"} isConstant=true) |
| * Till then, this will have to do. |
| */ |
| @Override |
| public boolean evalToNullIfParamIsNull(StatementContext context, int index) throws SQLException { |
| return index == 0; |
| } |
| |
| } |