Java SQL Type convertKnownType(Object one, Class to)

Description

convert Known Type

License

Apache License

Declaration

@SuppressWarnings({ "unchecked", "rawtypes" })
    public static <T> T convertKnownType(Object one, Class<T> to) 

Method Source Code

//package com.java2s;
/*/*www  .  j a v  a  2s  . co  m*/
 * Copyright 2010 Chad Retz
 * 
 * Licensed 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.
 */

import java.text.ParseException;
import java.text.SimpleDateFormat;
import com.google.common.primitives.Primitives;

public class Main {
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static <T> T convertKnownType(Object one, Class<T> to) {
        //let's be lazy right now
        if (to.isPrimitive()) {
            to = Primitives.wrap(to);
        }
        if (one == null) {
            return null;
        } else if (Number.class.isAssignableFrom(to)) {
            try {
                return to.getConstructor(String.class).newInstance(one.toString());
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (to.equals(String.class)) {
            return (T) one.toString();
        } else if (to.isEnum()) {
            return (T) Enum.valueOf((Class<Enum>) to, one.toString());
        } else if (java.sql.Date.class.equals(to)) {
            //meh
            try {
                return (T) new java.sql.Date(new SimpleDateFormat("yyyy-MM-dd").parse(one.toString()).getTime());
            } catch (ParseException e) {
                throw new RuntimeException(e);
            }
        } else {
            throw new IllegalArgumentException("Unknown class: " + to);
        }
    }
}

Related

1. columnScale(int columnType)
2. columnTypesDiffer(int t1, int t2)
3. compressType(int type)
4. convert2MysqlType(String cls)
5. convertBoolean(Object value, int srcType, int destType)
6. convertNumeric(Object value, int srcType, int destType)
7. convertOracleValue(Object value, int type)
8. convertParam(Object oValue, Class cType, String sFieldName)
9. convertSQLtype2JavaClassName(int type)