Java SQL Date convertTo(Class clazz, Object obj)

Description

convert To

License

Apache License

Declaration

public static Comparable<?> convertTo(Class<?> clazz, Object obj) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c)2014 Prometheus Consulting
 *
 * 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.//  w w  w . j  ava  2  s  .  c  o  m
 *******************************************************************************/

import java.math.BigDecimal;

public class Main {
    public static Comparable<?> convertTo(Class<?> clazz, Object obj) {
        if (obj == null) {
            return null;
        }
        if (clazz.isAssignableFrom(obj.getClass())) {
            return (Comparable<?>) obj;
        }
        if (clazz.isPrimitive()) {
            if (clazz.equals(Long.TYPE)) {
                clazz = Long.class;
            } else if (clazz.equals(Integer.TYPE)) {
                clazz = Integer.class;
            } else if (clazz.equals(Float.TYPE)) {
                clazz = Float.class;
            } else if (clazz.equals(Double.TYPE)) {
                clazz = Double.class;
            } else if (clazz.equals(Boolean.TYPE)) {
                clazz = Boolean.class;
            }
        }
        if (Number.class.isAssignableFrom(clazz)) {
            if (obj.getClass().equals(String.class)) {
                obj = new Double((String) obj);
            }
            if (!Number.class.isAssignableFrom(obj.getClass())) {
                throw new RuntimeException(
                        "Cannot convert from " + obj.getClass().getName() + " to " + clazz.getName());
            }
            Number number = (Number) obj;
            if (clazz.equals(Long.class)) {
                return new Long(number.longValue());
            }
            if (clazz.equals(Integer.class)) {
                return new Integer(number.intValue());
            }
            if (clazz.equals(Float.class)) {
                return new Float(number.floatValue());
            }
            if (clazz.equals(Double.class)) {
                return new Double(number.doubleValue());
            }
            if (clazz.equals(BigDecimal.class)) {
                return new BigDecimal(number.doubleValue());
            }
        }
        final String oStr = String.valueOf(obj);
        if (clazz.equals(String.class)) {
            return oStr;
        }
        if (clazz.equals(java.util.Date.class)) {
            return java.sql.Date.valueOf(oStr);
        }
        if (clazz.equals(java.sql.Date.class)) {
            return java.sql.Date.valueOf(oStr);
        }
        if (clazz.equals(Boolean.class)) {
            return new Boolean(oStr);
        }
        throw new RuntimeException("Cannot convert from " + obj.getClass().getName() + " to " + clazz.getName());
    }
}

Related

1. calcLastMonth(String begin, String end, String now, GregorianCalendar calendar)
2. calcThisMonth(String begin, String end, String now, GregorianCalendar calendar)
3. canConvert(Class clz)
4. convert(Class propertyType, Object value, String propertyName)
5. convert(Object o)
6. convertTo(final Class> clazz, Object obj)
7. getClasses()
8. getCurrDay()
9. getCurrentYear()