Attempt to find a java.lang.reflect.Method on the supplied class with the supplied name and no parameters. - Android java.lang.reflect

Android examples for java.lang.reflect:Method

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Description

Attempt to find a java.lang.reflect.Method on the supplied class with the supplied name and no parameters.

Demo Code

/*/*w w w. j  a  va  2  s . co m*/
 * Copyright 2002-2009 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.Method;
import java.util.Arrays;

public class Main {
  /**
   * Attempt to find a {@link java.lang.reflect.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 java.lang.reflect.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 java.lang.reflect.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 java.lang.reflect.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 (may be <code>null</code> to
   *          indicate any signature)
   * @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 (searchType != null) {
      Method[] methods = (searchType.isInterface() ? searchType.getMethods()
          : searchType.getDeclaredMethods());
      for (Method method : methods) {
        if (name.equals(method.getName())
            && (paramTypes == null || Arrays.equals(paramTypes,
                method.getParameterTypes()))) {
          return method;
        }
      }
      searchType = searchType.getSuperclass();
    }
    return null;
  }
}

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