Java Reflection Method Static Invoke invokeStaticMethod(final Class cls, final String methodName, final boolean throwException)

Description

Invoke the named static method.

License

Open Source License

Parameter

Parameter	Description
cls	The class.
methodName	The method name.
throwException	Whether to throw an exception on failure.

Exception

Parameter	Description
IllegalArgumentException	If the method could not be invoked.

Return

The result of the method invocation.

Declaration

public static Object invokeStaticMethod(final Class<?> cls, final String methodName,
        final boolean throwException) throws IllegalArgumentException 

Method Source Code

//package com.java2s;
/*/*from   w  w w  . j  a  v a 2 s.  c o m*/
 * This file is part of ClassGraph.
 *
 * Author: Luke Hutchison
 *
 * Hosted at: https://github.com/lukehutch/fast-classpath-scanner
 *
 * --
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 Luke Hutchison
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without
 * limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
 * EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
 * OR OTHER DEALINGS IN THE SOFTWARE.
 */

import java.lang.reflect.Method;

public class Main {
    /**
     * Invoke the named static method. If an exception is thrown while trying to call the method, and throwException
     * is true, then IllegalArgumentException is thrown wrapping the cause, otherwise this will return null. If
     * passed a null class reference, returns null unless throwException is true, then throws
     * IllegalArgumentException.
     * 
     * @param cls
     *            The class.
     * @param methodName
     *            The method name.
     * @param throwException
     *            Whether to throw an exception on failure.
     * @return The result of the method invocation.
     * @throws IllegalArgumentException
     *             If the method could not be invoked.
     */
    public static Object invokeStaticMethod(final Class<?> cls, final String methodName,
            final boolean throwException) throws IllegalArgumentException {
        if (cls != null) {
            try {
                final Method method = cls.getDeclaredMethod(methodName);
                try {
                    method.setAccessible(true);
                } catch (final Exception e) {
                }
                return method.invoke(null);
            } catch (final Throwable e) {
                if (throwException) {
                    throw new IllegalArgumentException("Could not invoke method \"" + methodName + "\"", e);
                }
            }
        } else if (throwException) {
            throw new IllegalArgumentException("Can't invoke static method on null class reference");
        }
        return null;
    }

    /**
     * Invoke the named static method. If an exception is thrown while trying to call the method, and throwException
     * is true, then IllegalArgumentException is thrown wrapping the cause, otherwise this will return null. If
     * passed a null class reference, returns null unless throwException is true, then throws
     * IllegalArgumentException.
     * 
     * @param cls
     *            The class.
     * @param methodName
     *            The method name.
     * @param argType
     *            The type of the parameter.
     * @param arg
     *            The argument value.
     * @param throwException
     *            Whether to throw an exception on failure.
     * @return The result of the method invocation.
     * @throws IllegalArgumentException
     *             If the method could not be invoked.
     */
    public static Object invokeStaticMethod(final Class<?> cls, final String methodName, final Class<?> argType,
            final Object arg, final boolean throwException) throws IllegalArgumentException {
        if (cls != null) {
            try {
                final Method method = cls.getDeclaredMethod(methodName, argType);
                try {
                    method.setAccessible(true);
                } catch (final Exception e) {
                }
                return method.invoke(null, arg);
            } catch (final Throwable e) {
                if (throwException) {
                    throw new IllegalArgumentException("Could not invoke method \"" + methodName + "\"", e);
                }
            }
        } else if (throwException) {
            throw new IllegalArgumentException("Can't invoke static method on null class reference");
        }
        return null;
    }
}

Related

1. invokeStaticMethod(Class cls, String name)
2. invokeStaticMethod(Class klass, String methodName)
3. invokeStaticMethod(Class objectType, String name, Class paramTypes[], Object args[])
4. invokeStaticMethod(Class pClass, String pMethod, Object pParam)
5. invokeStaticMethod(final Class cls, final String methodName)
6. invokeStaticMethod(final Class clazz, final String methodName, final Class[] parameterTypes, final Object[] arglist)
7. invokeStaticMethod(final Method method, final Object... args)
8. invokeStaticMethod(String className, String method, Class[] paramTypes, Object[] paramValues)
9. invokeStaticMethod(String className, String methodName)