Java Reflection Method Getter Get getGetter(A instance, String strAttributeName, Class clazz)

Description

Gets the setter.

License

Open Source License

Parameter

Parameter	Description
A	the generic type of the instance
instance	the instance
strAttributeName	the str attribute name
clazz	the clazz

Exception

Parameter	Description
SecurityException	the security exception
NoSuchMethodException	the no such method exception

Return

the setter

Declaration

public static <A> Method getGetter(A instance, String strAttributeName, Class<?> clazz)
        throws SecurityException, NoSuchMethodException 

Method Source Code

//package com.java2s;
/*/*from  w w  w  . j av a2  s.co  m*/
 * Copyright (c) 2002-2013, Mairie de Paris
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice
 *     and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright notice
 *     and the following disclaimer in the documentation and/or other materials
 *     provided with the distribution.
 *
 *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * License 1.0
 */

import java.lang.reflect.Method;

public class Main {
    private static final String PREFIX_GET = "get";

    /**
     * Gets the setter.
     *
     * @param <A> the generic type of the instance
     * @param instance the instance
     * @param strAttributeName the str attribute name
     * @param clazz the clazz
     * @return the setter
     * @throws SecurityException the security exception
     * @throws NoSuchMethodException the no such method exception
     */
    public static <A> Method getGetter(A instance, String strAttributeName, Class<?> clazz)
            throws SecurityException, NoSuchMethodException {
        return getMethod(PREFIX_GET, instance, strAttributeName, clazz);
    }

    /**
     * Gets the method.
     *
     * @param <A> the generic type of the instance
     * @param strMethodPrefix the str method prefix
     * @param instance the instance
     * @param strAttributeName the str attribute name
     * @param clazz the clazz
     * @return the method
     * @throws SecurityException the security exception
     * @throws NoSuchMethodException the no such method exception
     */
    public static <A> Method getMethod(String strMethodPrefix, A instance, String strAttributeName, Class<?> clazz)
            throws SecurityException, NoSuchMethodException {
        String strFirstLetter = strAttributeName.substring(0, 1).toUpperCase();

        String strMethodName = strMethodPrefix + strFirstLetter
                + strAttributeName.substring(1, strAttributeName.length());

        try {
            return instance.getClass().getMethod(strMethodName, new Class[] { clazz });
        } catch (NoSuchMethodException e) {
            return getPrimitiveMethod(strMethodName, instance, clazz);
        }
    }

    /**
     * Gets the primitive method.
     *
     * @param <A> the generic type of the instance
     * @param strMethodName the str method name
     * @param instance the instance
     * @param clazz the clazz
     * @return the primitive method
     * @throws SecurityException the security exception
     * @throws NoSuchMethodException the no such method exception
     */
    public static <A> Method getPrimitiveMethod(String strMethodName, A instance, Class<?> clazz)
            throws SecurityException, NoSuchMethodException {
        if (clazz.equals(Integer.class)) {
            return instance.getClass().getMethod(strMethodName, new Class[] { int.class });
        } else if (clazz.equals(Long.class)) {
            return instance.getClass().getMethod(strMethodName, new Class[] { long.class });
        } else if (clazz.equals(Double.class)) {
            return instance.getClass().getMethod(strMethodName, new Class[] { double.class });
        } else if (clazz.equals(Short.class)) {
            return instance.getClass().getMethod(strMethodName, new Class[] { short.class });
        } else if (clazz.equals(Byte.class)) {
            return instance.getClass().getMethod(strMethodName, new Class[] { byte.class });
        } else if (clazz.equals(Float.class)) {
            return instance.getClass().getMethod(strMethodName, new Class[] { float.class });
        } else if (clazz.equals(Character.class)) {
            return instance.getClass().getMethod(strMethodName, new Class[] { char.class });
        } else if (clazz.equals(Boolean.class)) {
            return instance.getClass().getMethod(strMethodName, new Class[] { boolean.class });
        }

        throw new NoSuchMethodException();
    }
}

Related

1. getGetter(Class _class, String fieldName)
2. getGetter(Class c, Field field)
3. getGetter(Class clazz, String name)
4. getGetter(Class clazz, Field field)