com.emily.infrastructure.common.ObjectUtils Maven / Gradle / Ivy
package com.emily.infrastructure.common;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Map;
/**
* 对象类型工具类
*
* @author Emily
* @since Created in 2023/6/13 10:30 AM
*/
public class ObjectUtils {
/**
* 判定对象是否为null
* ---------------------------------------------------
* 示例：
* Assert.assertTrue(ObjectUtils.isNull(null));
* Assert.assertFalse(ObjectUtils.isNull(""));
* Assert.assertFalse(ObjectUtils.isNull("a"));
* Assert.assertFalse(ObjectUtils.isNull(new Object()));
* ---------------------------------------------------
*
* @param obj 对象
* @return true-是，false-否
*/
public static boolean isNull(Object obj) {
return obj == null;
}
/**
* 判定对象是否不为null
* -----------------------------------------------------
* 示例：
* Assert.assertFalse(ObjectUtils.isNotNull(null));
* Assert.assertTrue(ObjectUtils.isNotNull(""));
* Assert.assertTrue(ObjectUtils.isNotNull("a"));
* Assert.assertTrue(ObjectUtils.isNotNull(new Object()));
* -----------------------------------------------------
*
* @param obj 对象
* @return true-是 false-否
*/
public static boolean isNotNull(Object obj) {
return !isNull(obj);
}
/**
* 判断对象是否为Null
* -------------------------------------------------------
* 示例：
* Assert.assertTrue(ObjectUtils.isEmpty(null));
* Assert.assertTrue(ObjectUtils.isEmpty(""));
* Assert.assertTrue(ObjectUtils.isEmpty(new String[]{}));
* Assert.assertTrue(ObjectUtils.isEmpty(Collections.emptyMap()));
* Assert.assertTrue(ObjectUtils.isEmpty(Collections.emptyList()));
* -------------------------------------------------------
*
* @param object 对象
* @return true-是 false-否
*/
public static boolean isEmpty(final Object object) {
if (object == null) {
return true;
}
if (object instanceof CharSequence) {
return ((CharSequence) object).length() == 0;
}
if (object.getClass().isArray()) {
return Array.getLength(object) == 0;
}
if (object instanceof Collection) {
return ((Collection) object).isEmpty();
}
if (object instanceof Map) {
return ((Map) object).isEmpty();
}
return false;
}
/**
* 判断对象是否为空
* ------------------------------------------------------
* 示例：
* Assert.assertFalse(ObjectUtils.isNotEmpty(null));
* Assert.assertFalse(ObjectUtils.isNotEmpty(""));
* Assert.assertFalse(ObjectUtils.isNotEmpty(new String[]{}));
* Assert.assertFalse(ObjectUtils.isNotEmpty(Collections.emptyMap()));
* Assert.assertFalse(ObjectUtils.isNotEmpty(Collections.emptyList()));
* ------------------------------------------------------
*
* @param object 对象
* @return true-是 false-否
*/
public static boolean isNotEmpty(final Object object) {
return !isEmpty(object);
}
/**
* {@code
* Assert.assertEquals(ObjectUtils.defaultIfNull(null, "a"), "a");
* Assert.assertEquals(ObjectUtils.defaultIfNull("b", "a"), "b");
* }
*
* @param obj 待判定是否为null的对象
* @param defaultObj 默认对象
* @param 数据类型
* @return 符合条件的对象
*/
public static T defaultIfNull(final T obj, final T defaultObj) {
return obj == null ? defaultObj : obj;
}
}