Java Object Type Case cast(final Number number, final Class returnType)

Description

Casts the number to the provided return type.

License

Apache License

Parameter

Parameter	Description
R	the desired return type.
number	the number to convert.
returnType	the return type.

Return

the number in the return type.

Declaration

public static final <R extends Number> R cast(final Number number, final Class<R> returnType) 

Method Source Code

//package com.java2s;
/*// www.j  ava 2  s . co m
 * #%L
 * jutility-common
 * %%
 * Copyright (C) 2013 - 2014 jutility.org
 * %%
 * 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.
 * #L%
 */

public class Main {
    /**
     * Casts the number to the provided return type.
     *
     * @param <R>
     *            the desired return type.
     *
     * @param number
     *            the number to convert.
     * @param returnType
     *            the return type.
     * @return the number in the return type.
     */
    public static final <R extends Number> R cast(final Number number, final Class<R> returnType) {

        if ((number == null) || (returnType == null)) {
            return null;
        }

        if (returnType == Double.class) {

            final Double value = number.doubleValue();

            return returnType.cast(value);
        } else if (returnType == Float.class) {

            final Float value = number.floatValue();

            return returnType.cast(value);
        } else if (returnType == Long.class) {

            final Long value = number.longValue();

            return returnType.cast(value);
        } else if (returnType == Integer.class) {

            final Integer value = number.intValue();

            return returnType.cast(value);
        } else if (returnType == Short.class) {

            final Short value = number.shortValue();

            return returnType.cast(value);
        } else if (returnType == Byte.class) {

            final Byte value = number.byteValue();

            return returnType.cast(value);
        }

        throw new UnsupportedOperationException("Cannot convert number of type " + number.getClass()
                + " to desired return type " + returnType + "!");
    }

    /**
     * Casts the value to the provided return type.
     *
     * @param <R>
     *            the desired return type.
     *
     * @param value
     *            the value to convert.
     * @param returnType
     *            the return type.
     * @return the number in the return type.
     */
    public static final <R> R cast(final Object value, final Class<R> returnType) {

        if ((value == null) || (returnType == null)) {
            return null;
        }

        if (returnType.isAssignableFrom(value.getClass())) {

            return returnType.cast(value);
        }

        throw new UnsupportedOperationException("Cannot convert object of type " + value.getClass()
                + " to desired return type " + returnType + "!");
    }
}

Related

1. cast(Class toType, Object value)
2. cast(Class type, Object key, Object value)
3. cast(Class type, Object obj)
4. cast(double[] arr)
5. cast(final Class clazz)
6. cast(final Object o)
7. cast(final Object obj, final Class type)
8. cast(final Object object)
9. cast(final Object original)