Java Reflection Method Parameter getMethod(final Class<?> clazz, final String name, final Class<?>... parametertypes)

Description

Get a method by name.

License

Open Source License

Declaration

public static Method getMethod(final Class<?> clazz, final String name, final Class<?>... parametertypes)
        throws NoSuchMethodException

Method Source Code


//package com.java2s;
/*/*from  w  w  w .  j  a  v  a  2  s.  c o m*/
 *
 *  * Copyright (c) 2014- MHISoft LLC and/or its affiliates. All rights reserved.
 *  * Licensed to MHISoft LLC under one or more contributor
 *  * license agreements. See the NOTICE file distributed with
 *  * this work for additional information regarding copyright
 *  * ownership. MHISoft LLC licenses this file to you 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.util.ArrayList;
import java.util.Arrays;

import java.util.List;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class Main {
    /**
     * Get a method by name.
     */
    public static Method getMethod(final Class<?> clazz, final String name, final Class<?>... parametertypes)
            throws NoSuchMethodException {
        Method result = null;
        for (final Method method : getMethods(clazz)) {
            if (method.getName().equals(name) && Arrays.equals(method.getParameterTypes(), parametertypes)) {
                result = method;
                break;
            }
        }
        if (result == null)
            throw new NoSuchMethodException(name);

        return result;
    }

    /**
     * List of all the methods of the class, and all of its superclasses.
     * NOTE: This returns the most common kind of methods which by default excludes
     * {@link Modifier#STATIC} methods.
     */
    public static List<Method> getMethods(final Class<?> clazz) {
        return getMethods(clazz, Modifier.STATIC);
    }

    /**
     * List of all the methods of the class and all of its superclasses.
     */
    public static List<Method> getMethods(final Class<?> clazz, final int excludedModifiers) {
        final ArrayList<Method> result = new ArrayList<Method>();
        for (Class<?> c = clazz; c != null; c = c.getSuperclass()) {
            final List<Method> methods = getDeclaredMethods(c, 0, excludedModifiers);
            result.addAll(0, methods);
        }
        return result;
    }

    /**
     * List of all the methods of the class (not its superclasses).
     */
    private static List<Method> getDeclaredMethods(final Class<?> clazz, final int includedModifiers,
            final int excludedModifiers) {
        final List<Method> result = new ArrayList<Method>();
        for (final Method m : clazz.getDeclaredMethods()) {
            final int methodModifiers = m.getModifiers();
            if (includedModifiers != 0 && ((methodModifiers & includedModifiers) == 0))
                continue;
            if ((methodModifiers & excludedModifiers) == 0)
                result.add(m);
        }
        return result;
    }
}

Java Reflection Method Parameter getMethod(final Class clazz, final String name, final Class... parametertypes)

Description

License

Declaration

Method Source Code

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