All Downloads are FREE. Search and download functionalities are using the official Maven repository.

cn.hutool.core.lang.Dict Maven / Gradle / Ivy

Go to download

Hutool是一个小而全的Java工具类库,通过静态方法封装,降低相关API的学习成本,提高工作效率,使Java拥有函数式语言般的优雅,让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34
Show newest version
package cn.hutool.core.lang;

import cn.hutool.core.bean.BeanPath;
import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.convert.Convert;
import cn.hutool.core.getter.BasicTypeGetter;
import cn.hutool.core.lang.func.Func0;
import cn.hutool.core.lang.func.LambdaUtil;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;
import java.util.function.BiFunction;
import java.util.function.Function;

/**
 * 字典对象,扩充了HashMap中的方法
 *
 * @author loolly
 */
public class Dict extends LinkedHashMap implements BasicTypeGetter {
	private static final long serialVersionUID = 6135423866861206530L;

	static final float DEFAULT_LOAD_FACTOR = 0.75f;
	static final int DEFAULT_INITIAL_CAPACITY = 1 << 4; // aka 16

	/**
	 * 是否大小写不敏感
	 */
	private boolean caseInsensitive;

	// --------------------------------------------------------------- Static method start

	/**
	 * 创建Dict
	 *
	 * @return Dict
	 */
	public static Dict create() {
		return new Dict();
	}

	/**
	 * 将PO对象转为Dict
	 *
	 * @param   Bean类型
	 * @param bean Bean对象
	 * @return Vo
	 */
	public static  Dict parse(T bean) {
		return create().parseBean(bean);
	}

	/**
	 * 根据给定的Pair数组创建Dict对象
	 *
	 * @param pairs 键值对
	 * @return Dict
	 * @since 5.4.1
	 */
	@SafeVarargs
	public static Dict of(Pair... pairs) {
		final Dict dict = create();
		for (Pair pair : pairs) {
			dict.put(pair.getKey(), pair.getValue());
		}
		return dict;
	}

	/**
	 * 根据给定的键值对数组创建Dict对象,传入参数必须为key,value,key,value...
	 *
	 * 

奇数参数必须为key,key最后会转换为String类型。

*

偶数参数必须为value,可以为任意类型。

* *
	 * Dict dict = Dict.of(
	 * 	"RED", "#FF0000",
	 * 	"GREEN", "#00FF00",
	 * 	"BLUE", "#0000FF"
	 * );
	 * 
* * @param keysAndValues 键值对列表,必须奇数参数为key,偶数参数为value * @return Dict * @since 5.4.1 */ public static Dict of(Object... keysAndValues) { final Dict dict = create(); String key = null; for (int i = 0; i < keysAndValues.length; i++) { if (i % 2 == 0) { key = Convert.toStr(keysAndValues[i]); } else { dict.put(key, keysAndValues[i]); } } return dict; } // --------------------------------------------------------------- Static method end // --------------------------------------------------------------- Constructor start /** * 构造 */ public Dict() { this(false); } /** * 构造 * * @param caseInsensitive 是否大小写不敏感 */ public Dict(boolean caseInsensitive) { this(DEFAULT_INITIAL_CAPACITY, caseInsensitive); } /** * 构造 * * @param initialCapacity 初始容量 */ public Dict(int initialCapacity) { this(initialCapacity, false); } /** * 构造 * * @param initialCapacity 初始容量 * @param caseInsensitive 是否大小写不敏感 */ public Dict(int initialCapacity, boolean caseInsensitive) { this(initialCapacity, DEFAULT_LOAD_FACTOR, caseInsensitive); } /** * 构造 * * @param initialCapacity 初始容量 * @param loadFactor 容量增长因子,0~1,即达到容量的百分之多少时扩容 */ public Dict(int initialCapacity, float loadFactor) { this(initialCapacity, loadFactor, false); } /** * 构造 * * @param initialCapacity 初始容量 * @param loadFactor 容量增长因子,0~1,即达到容量的百分之多少时扩容 * @param caseInsensitive 是否大小写不敏感 * @since 4.5.16 */ public Dict(int initialCapacity, float loadFactor, boolean caseInsensitive) { super(initialCapacity, loadFactor); this.caseInsensitive = caseInsensitive; } /** * 构造 * * @param m Map */ public Dict(Map m) { super((null == m) ? new HashMap<>() : m); } // --------------------------------------------------------------- Constructor end /** * 转换为Bean对象 * * @param Bean类型 * @param bean Bean * @return Bean */ public T toBean(T bean) { return toBean(bean, false); } /** * 转换为Bean对象 * * @param Bean类型 * @param bean Bean * @return Bean * @since 3.3.1 */ public T toBeanIgnoreCase(T bean) { BeanUtil.fillBeanWithMapIgnoreCase(this, bean, false); return bean; } /** * 转换为Bean对象 * * @param Bean类型 * @param bean Bean * @param isToCamelCase 是否转换为驼峰模式 * @return Bean */ public T toBean(T bean, boolean isToCamelCase) { BeanUtil.fillBeanWithMap(this, bean, isToCamelCase, false); return bean; } /** * 转换为Bean对象,并使用驼峰法模式转换 * * @param Bean类型 * @param bean Bean * @return Bean */ public T toBeanWithCamelCase(T bean) { BeanUtil.fillBeanWithMap(this, bean, true, false); return bean; } /** * 填充Value Object对象 * * @param Bean类型 * @param clazz Value Object(或者POJO)的类 * @return vo */ public T toBean(Class clazz) { return BeanUtil.toBean(this, clazz); } /** * 填充Value Object对象,忽略大小写 * * @param Bean类型 * @param clazz Value Object(或者POJO)的类 * @return vo */ public T toBeanIgnoreCase(Class clazz) { return BeanUtil.toBeanIgnoreCase(this, clazz, false); } /** * 将值对象转换为Dict
* 类名会被当作表名,小写第一个字母 * * @param Bean类型 * @param bean 值对象 * @return 自己 */ public Dict parseBean(T bean) { Assert.notNull(bean, "Bean class must be not null"); this.putAll(BeanUtil.beanToMap(bean)); return this; } /** * 将值对象转换为Dict
* 类名会被当作表名,小写第一个字母 * * @param Bean类型 * @param bean 值对象 * @param isToUnderlineCase 是否转换为下划线模式 * @param ignoreNullValue 是否忽略值为空的字段 * @return 自己 */ public Dict parseBean(T bean, boolean isToUnderlineCase, boolean ignoreNullValue) { Assert.notNull(bean, "Bean class must be not null"); this.putAll(BeanUtil.beanToMap(bean, isToUnderlineCase, ignoreNullValue)); return this; } /** * 与给定实体对比并去除相同的部分
* 此方法用于在更新操作时避免所有字段被更新,跳过不需要更新的字段 version from 2.0.0 * * @param 字典对象类型 * @param dict 字典对象 * @param withoutNames 不需要去除的字段名 */ public void removeEqual(T dict, String... withoutNames) { HashSet withoutSet = CollUtil.newHashSet(withoutNames); for (Map.Entry entry : dict.entrySet()) { if (withoutSet.contains(entry.getKey())) { continue; } final Object value = this.get(entry.getKey()); if (Objects.equals(value, entry.getValue())) { this.remove(entry.getKey()); } } } /** * 过滤Map保留指定键值对,如果键不存在跳过 * * @param keys 键列表 * @return Dict 结果 * @since 4.0.10 */ public Dict filter(String... keys) { final Dict result = new Dict(keys.length, 1); for (String key : keys) { if (this.containsKey(key)) { result.put(key, this.get(key)); } } return result; } // -------------------------------------------------------------------- Set start /** * 设置列 * * @param attr 属性 * @param value 值 * @return 本身 */ public Dict set(String attr, Object value) { this.put(attr, value); return this; } /** * 设置列,当键或值为null时忽略 * * @param attr 属性 * @param value 值 * @return 本身 */ public Dict setIgnoreNull(String attr, Object value) { if (null != attr && null != value) { set(attr, value); } return this; } // -------------------------------------------------------------------- Set end // -------------------------------------------------------------------- Get start @Override public Object getObj(String key) { return super.get(key); } /** * 获得特定类型值 * * @param 值类型 * @param attr 字段名 * @return 字段值 * @since 4.6.3 */ public T getBean(String attr) { return get(attr, null); } /** * 获得特定类型值 * * @param 值类型 * @param attr 字段名 * @param defaultValue 默认值 * @return 字段值 */ @SuppressWarnings("unchecked") public T get(String attr, T defaultValue) { final Object result = get(attr); return (T) (result != null ? result : defaultValue); } /** * @param attr 字段名 * @return 字段值 */ @Override public String getStr(String attr) { return Convert.toStr(get(attr), null); } /** * @param attr 字段名 * @return 字段值 */ @Override public Integer getInt(String attr) { return Convert.toInt(get(attr), null); } /** * @param attr 字段名 * @return 字段值 */ @Override public Long getLong(String attr) { return Convert.toLong(get(attr), null); } /** * @param attr 字段名 * @return 字段值 */ @Override public Float getFloat(String attr) { return Convert.toFloat(get(attr), null); } @Override public Short getShort(String attr) { return Convert.toShort(get(attr), null); } @Override public Character getChar(String attr) { return Convert.toChar(get(attr), null); } @Override public Double getDouble(String attr) { return Convert.toDouble(get(attr), null); } @Override public Byte getByte(String attr) { return Convert.toByte(get(attr), null); } /** * @param attr 字段名 * @return 字段值 */ @Override public Boolean getBool(String attr) { return Convert.toBool(get(attr), null); } /** * @param attr 字段名 * @return 字段值 */ @Override public BigDecimal getBigDecimal(String attr) { return Convert.toBigDecimal(get(attr)); } /** * @param attr 字段名 * @return 字段值 */ @Override public BigInteger getBigInteger(String attr) { return Convert.toBigInteger(get(attr)); } @Override public > E getEnum(Class clazz, String key) { return Convert.toEnum(clazz, get(key)); } /** * @param attr 字段名 * @return 字段值 */ public byte[] getBytes(String attr) { return get(attr, null); } /** * @param attr 字段名 * @return 字段值 */ @Override public Date getDate(String attr) { return get(attr, null); } /** * @param attr 字段名 * @return 字段值 */ public Time getTime(String attr) { return get(attr, null); } /** * @param attr 字段名 * @return 字段值 */ public Timestamp getTimestamp(String attr) { return get(attr, null); } /** * @param attr 字段名 * @return 字段值 */ public Number getNumber(String attr) { return get(attr, null); } /** * 通过表达式获取JSON中嵌套的对象
*
    *
  1. .表达式,可以获取Bean对象中的属性(字段)值或者Map中key对应的值
  2. *
  3. []表达式,可以获取集合等对象中对应index的值
  4. *
*

* 表达式栗子: * *

	 * persion
	 * persion.name
	 * persons[3]
	 * person.friends[5].name
	 * 
* * @param 目标类型 * @param expression 表达式 * @return 对象 * @see BeanPath#get(Object) * @since 5.7.14 */ @SuppressWarnings("unchecked") public T getByPath(String expression) { return (T) BeanPath.create(expression).get(this); } /** * 通过表达式获取JSON中嵌套的对象
*
    *
  1. .表达式,可以获取Bean对象中的属性(字段)值或者Map中key对应的值
  2. *
  3. []表达式,可以获取集合等对象中对应index的值
  4. *
*

* 表达式栗子: * *

	 * persion
	 * persion.name
	 * persons[3]
	 * person.friends[5].name
	 * 
*

* 获取表达式对应值后转换为对应类型的值 * * @param 返回值类型 * @param expression 表达式 * @param resultType 返回值类型 * @return 对象 * @see BeanPath#get(Object) * @since 5.7.14 */ public T getByPath(String expression, Class resultType) { return Convert.convert(resultType, getByPath(expression)); } // -------------------------------------------------------------------- Get end @Override public boolean containsKey(Object key) { return super.containsKey(customKey((String) key)); } @Override public Object get(Object key) { return super.get(customKey((String) key)); } @Override public Object put(String key, Object value) { return super.put(customKey(key), value); } @Override public void putAll(Map m) { m.forEach(this::put); } @Override public Dict clone() { return (Dict) super.clone(); } @Override public Object remove(Object key) { return super.remove(customKey((String) key)); } @Override public boolean remove(Object key, Object value) { return super.remove(customKey((String) key), value); } @Override public boolean replace(String key, Object oldValue, Object newValue) { return super.replace(customKey(key), oldValue, newValue); } @Override public Object replace(String key, Object value) { return super.replace(customKey(key), value); } //---------------------------------------------------------------------------- Override default methods start @Override public Object getOrDefault(Object key, Object defaultValue) { return super.getOrDefault(customKey((String) key), defaultValue); } @Override public Object computeIfPresent(final String key, final BiFunction remappingFunction) { return super.computeIfPresent(customKey(key), remappingFunction); } @Override public Object compute(final String key, final BiFunction remappingFunction) { return super.compute(customKey(key), remappingFunction); } @Override public Object merge(final String key, final Object value, final BiFunction remappingFunction) { return super.merge(customKey(key), value, remappingFunction); } @Override public Object putIfAbsent(String key, Object value) { return super.putIfAbsent(customKey(key), value); } @Override public Object computeIfAbsent(String key, Function mappingFunction) { return super.computeIfAbsent(customKey(key), mappingFunction); } //---------------------------------------------------------------------------- Override default methods end /** * 将Key转为小写 * * @param key KEY * @return 小写KEY */ private String customKey(String key) { if (this.caseInsensitive && null != key) { key = key.toLowerCase(); } return key; } /** * 通过lambda批量设置值
* 实际使用时,可以使用getXXX的方法引用来完成键值对的赋值: *

	 *     User user = GenericBuilder.of(User::new).with(User::setUsername, "hutool").build();
	 *     Dict.create().setFields(user::getNickname, user::getUsername);
	 * 
* * @param fields lambda,不能为空 * @return this * @since 5.7.23 */ public Dict setFields(Func0... fields) { Arrays.stream(fields).forEach(f -> set(LambdaUtil.getFieldName(f), f.callWithRuntimeException())); return this; } }




© 2015 - 2024 Weber Informatics LLC | Privacy Policy