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返回对象增加自定义处理后返回，如果不存在则返回用户定义类型的默认对象.

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This commit is contained in:
liliexuan 2020-10-23 12:43:45 +08:00
parent cde74fe319
commit 34f20cb4d5
2 changed files with 69 additions and 6 deletions
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38
hutool-core/src/main/java/cn/hutool/core/util/ObjectUtil.java
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@ -14,7 +14,12 @@ import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.util.*;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.Objects;
import java.util.function.Supplier;
/**
* 对象工具类，包括判空、克隆、序列化等操作
@ -297,6 +302,37 @@ public class ObjectUtil {
return (null != object) ? object : defaultValue;
}
/**
* 如果给定对象为{@code null} 返回默认值, 如果不为null 返回自定义handle处理后的返回值
* @param source Object 类型对象
* @param handle 自定义的处理方法
* @param defaultValue 默认为空的返回值
* @param <T> 被检查对象为{@code null}返回默认值，否则返回自定义handle处理后的返回值
* @return
*/
public static <T> T defaultIfNull(final Object source, Supplier<? extends T> handle, final T defaultValue) {
if (Objects.nonNull(source)) {
return handle.get();
}
return defaultValue;
}
/**
* 如果给定对象为{@code null}或者""返回默认值, 否则返回自定义handle处理后的返回值
* @param str String 类型
* @param handle 自定义的处理方法
* @param defaultValue 默认为空的返回值
* @param <T> 被检查对象为{@code null}或者 ""返回默认值，否则返回自定义handle处理后的返回值
* @return
*/
public static <T> T defaultIfEmpty(final String str, Supplier<? extends T> handle, final T defaultValue) {
if (StrUtil.isNotEmpty(str)) {
return handle.get();
}
return defaultValue;
}
/**
* 如果给定对象为{@code null}或者 "" 返回默认值
*

37
hutool-core/src/test/java/cn/hutool/core/util/ObjectUtilTest.java
View File

@ -1,12 +1,14 @@
package cn.hutool.core.util;
import java.util.ArrayList;
import org.junit.Assert;
import org.junit.Test;
import cn.hutool.core.clone.CloneSupport;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.date.DatePattern;
import cn.hutool.core.date.DateUtil;
import org.junit.Assert;
import org.junit.Test;
import java.time.Instant;
import java.util.ArrayList;
public class ObjectUtilTest {
@ -29,4 +31,29 @@ public class ObjectUtilTest {
String result = ObjectUtil.toString(strings);
Assert.assertEquals("[1, 2]", result);
}
@Test
public void defaultIfNullTest() {
final String nullValue = null;
final String dateStr = "2020-10-23 15:12:30";
Instant result1 = ObjectUtil.defaultIfNull(dateStr,
() -> DateUtil.parse(dateStr, DatePattern.NORM_DATETIME_PATTERN).toInstant(), Instant.now());
Assert.assertNotNull(result1);
Instant result2 = ObjectUtil.defaultIfNull(nullValue,
() -> DateUtil.parse(nullValue, DatePattern.NORM_DATETIME_PATTERN).toInstant(), Instant.now());
Assert.assertNotNull(result2);
}
@Test
public void defaultIfEmptyTest() {
final String emptyValue = "";
final String dateStr = "2020-10-23 15:12:30";
Instant result1 = ObjectUtil.defaultIfEmpty(emptyValue,
() -> DateUtil.parse(emptyValue, DatePattern.NORM_DATETIME_PATTERN).toInstant(), Instant.now());
Assert.assertNotNull(result1);
Instant result2 = ObjectUtil.defaultIfEmpty(dateStr,
() -> DateUtil.parse(dateStr, DatePattern.NORM_DATETIME_PATTERN).toInstant(), Instant.now());
Assert.assertNotNull(result2);
}
}