Returns a getter method for a given property, no matter if the method is visible or hidden or if it is declared in the given class or in a superclass or implemented interface. - Java Reflection

Java examples for Reflection:Getter

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Description

Returns a getter method for a given property, no matter if the method is visible or hidden or if it is declared in the given class or in a superclass or implemented interface.

Demo Code

/*// w  ww  . j  av a  2s. c om
 * Copyright (c) 2012 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     HUMBOLDT EU Integrated Project #030962
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */
//package com.java2s;

import java.lang.reflect.Method;

public class Main {
    /**
     * Returns a getter method for a given property, no matter if the method is
     * visible or hidden or if it is declared in the given class or in a
     * superclass or implemented interface.
     * 
     * @param c the class which would contain the getter method
     * @param property the property
     * @param propertyType the property's type (can be null if the type does not
     *            matter)
     * @return the getter or null if there is no getter for this property
     */
    public static Method findDeepGetter(Class<?> c, String property,
            Class<?> propertyType) {
        if (c == Object.class || c == null) {
            return null;
        }

        char[] propertyNameArr = property.toCharArray();
        propertyNameArr[0] = Character.toUpperCase(propertyNameArr[0]);
        String getterName = "get" + new String(propertyNameArr); //$NON-NLS-1$

        Method result = null;
        // search visible and hidden methods in this class
        Method[] methods = c.getDeclaredMethods();
        for (Method m : methods) {
            if (m.getName().equals(getterName)
                    && m.getParameterTypes().length == 0
                    && (propertyType == null || propertyType
                            .isAssignableFrom(m.getReturnType()))) {
                result = m;
                break;
            }
        }

        // search superclass and interfaces
        if (result == null) {
            result = findDeepGetter(c.getSuperclass(), property,
                    propertyType);
            if (result == null) {
                Class<?>[] interfaces = c.getInterfaces();
                for (Class<?> inter : interfaces) {
                    result = findDeepGetter(inter, property, propertyType);
                    if (result != null) {
                        break;
                    }
                }
            }
        }

        return result;
    }
}

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