Attempt to find a java.lang.reflect.Field field on the supplied Class with the supplied name. - Android java.lang.reflect

Android examples for java.lang.reflect:Field Name

  1. HOME
  2. Android
  3. java.lang.reflect
  4. Field Name

Description

Attempt to find a java.lang.reflect.Field field on the supplied Class with the supplied name.

Demo Code

/*//from ww  w  . jav a  2  s. c o  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.Field;

public class Main {
  /**
   * Attempt to find a {@link java.lang.reflect.Field field} on the supplied
   * {@link Class} with the supplied <code>name</code>. Searches all
   * superclasses up to {@link Object}.
   * 
   * @param clazz
   *          the class to introspect
   * @param name
   *          the name of the field
   * @return the corresponding Field object, or <code>null</code> if not found
   */
  public static Field findField(Class<?> clazz, String name) {
    return findField(clazz, name, null);
  }

  /**
   * Attempt to find a {@link java.lang.reflect.Field field} on the supplied
   * {@link Class} with the supplied <code>name</code> and/or {@link Class type}
   * . Searches all superclasses up to {@link Object}.
   * 
   * @param clazz
   *          the class to introspect
   * @param name
   *          the name of the field (may be <code>null</code> if type is
   *          specified)
   * @param type
   *          the type of the field (may be <code>null</code> if name is
   *          specified)
   * @return the corresponding Field object, or <code>null</code> if not found
   */
  public static Field findField(Class<?> clazz, String name, Class<?> type) {

    Class<?> searchType = clazz;
    while (!Object.class.equals(searchType) && searchType != null) {
      Field[] fields = searchType.getDeclaredFields();
      for (Field field : fields) {
        if ((name == null || name.equals(field.getName()))
            && (type == null || type.equals(field.getType()))) {
          return field;
        }
      }
      searchType = searchType.getSuperclass();
    }
    return null;
  }
}

Related Tutorials