PropertyDescriptorのテスト

PropertyDescriptorTest.java

package fumokmm.npnl;

import static org.junit.Assert.*;

import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.junit.Test;

public class PropertyDescriptorTest {

  /**
   * Bean
   * @author fumo
   */
  private static class User {
    private String name;
    public String getName() { return name; }
    public void setName(String name) { this.name = name; }
  }
  
  @Test
  public void testPropertyDescriptor() throws Exception {
    // Bean生成
    User userBean = new User();
    userBean.setName("fumo");

    // デスクリプタを用意
    PropertyDescriptor nameProp = new PropertyDescriptor("name", User.class);
                         // or... new PropertyDescriptor("name", userBean.getClass());

    // ゲッターメソッド取得
    Method nameGetter = nameProp.getReadMethod();
    String name = (String) nameGetter.invoke(userBean, (Object[]) null);
    assertEquals("fumo", name);

    // セッターメソッド取得
    Method nameSetter = nameProp.getWriteMethod();
    nameSetter.invoke(userBean, "kmm");
    //  or... .invoke(userBean, new Object[]{ "kmm" });
    assertEquals("kmm", userBean.getName());
    
    // copyPropertyしてみる
    User user1 = new User();
    user1.setName("user1");
    User user2 = new User();
    assertNull("まだnull", user2.getName());
    nameSetter.invoke(user2, nameGetter.invoke(user1, (Object[]) null));
    assertEquals("コピーされて、同じになるはず", user1.getName(), user2.getName());
  }
  
  @Test
  public void normalReflection() {
    // Bean生成
    User user1 = new User();
    User user2 = new User();
    user1.setName("fumo");
    
    try {
      Method nameGetter = User.class.getMethod("getName", (Class<?>[]) null);
      Method nameSetter = User.class.getMethod("setName", String.class);

      nameSetter.invoke(user2, nameGetter.invoke(user1, (Object[]) null));
      assertEquals("コピーされて、同じになるはず", user1.getName(), user2.getName());

    } catch (SecurityException e) {
      e.printStackTrace();
    } catch (NoSuchMethodException e) {
      e.printStackTrace();
    } catch (IllegalArgumentException e) {
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    } catch (InvocationTargetException e) {
      e.printStackTrace();
    }
  }
}