ReflectionUtils.java Source code

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Here is the source code for ReflectionUtils.java

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/*
 * Copyright 2002-2008 the original author or authors.
 *
 * 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.
 */

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

/**
 * Simple utility class for working with the reflection API and handling
 * reflection exceptions.
 *
 * <p>Only intended for internal use.
 *
 * @author Juergen Hoeller
 * @author Rob Harrop
 * @author Rod Johnson
 * @author Costin Leau
 * @since 1.2.2
 */
public abstract class ReflectionUtils {

    /**
     * Attempt to find a {@link Method} on the supplied class with the supplied name
     * and no parameters. Searches all superclasses up to <code>Object</code>.
     * <p>Returns <code>null</code> if no {@link Method} can be found.
     * @param clazz the class to introspect
     * @param name the name of the method
     * @return the Method object, or <code>null</code> if none found
     */
    public static Method findMethod(Class clazz, String name) {
        return findMethod(clazz, name, new Class[0]);
    }

    /**
     * Attempt to find a {@link Method} on the supplied class with the supplied name
     * and parameter types. Searches all superclasses up to <code>Object</code>.
     * <p>Returns <code>null</code> if no {@link Method} can be found.
     * @param clazz the class to introspect
     * @param name the name of the method
     * @param paramTypes the parameter types of the method
     * @return the Method object, or <code>null</code> if none found
     */
    public static Method findMethod(Class clazz, String name, Class[] paramTypes) {

        Class searchType = clazz;
        while (!Object.class.equals(searchType) && searchType != null) {
            Method[] methods = (searchType.isInterface() ? searchType.getMethods()
                    : searchType.getDeclaredMethods());
            for (int i = 0; i < methods.length; i++) {
                Method method = methods[i];
                if (name.equals(method.getName()) && Arrays.equals(paramTypes, method.getParameterTypes())) {
                    return method;
                }
            }
            searchType = searchType.getSuperclass();
        }
        return null;
    }

}