| /* |
| * 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.empire.db.expr.column; |
| |
| import org.apache.empire.data.DataType; |
| import org.apache.empire.db.DBColumnExpr; |
| |
| /** |
| * This class is used to convert a value to a different data type. |
| * This function uses the DBMSHandler.getConvertPhrase function to obtain a conversion template. |
| * <P> |
| * There is no need to explicitly create instances of this class.<BR> |
| * Instead use {@link DBColumnExpr#convertTo(DataType) } |
| * <P> |
| * @author doebele |
| */ |
| public class DBConvertExpr extends DBAbstractFuncExpr |
| { |
| // *Deprecated* private static final long serialVersionUID = 1L; |
| |
| private final Object format; |
| |
| /** |
| * Constructs a DBDecodeExpr |
| * @param expr the expression to be converted |
| * @param dataType the target data type |
| * @param format optional formatting information |
| */ |
| public DBConvertExpr(DBColumnExpr expr, DataType dataType, Object format) |
| { |
| super(expr, false, dataType); |
| // Save Info |
| this.format = format; |
| } |
| |
| @Override |
| protected String getFunctionName() |
| { |
| return dataType.name(); |
| } |
| |
| @Override |
| public void addSQL(StringBuilder sql, long context) |
| { |
| // Set Params |
| String template = getDbms().getConvertPhrase(dataType, expr.getDataType(), format); |
| super.addSQL(sql, template, null, context); |
| } |
| |
| } |