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

com.github.zhangxd1989.basetool.convert.impl.Jdk8DateConverter Maven / Gradle / Ivy

Go to download

Java Common Utils

There is a newer version: 1.0.16
Show newest version
package com.github.zhangxd1989.basetool.convert.impl;

import com.github.zhangxd1989.basetool.convert.AbstractConverter;
import com.github.zhangxd1989.basetool.util.ClassUtil;
import com.github.zhangxd1989.basetool.util.ReflectUtil;

import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;


/**
 * JDK8中新加入的java.time包对象解析转换器

 * 通过反射调用“parse方法”，支持的对象包括：
 *
 * 
 * java.time.LocalDateTime
 * java.time.LocalDate
 * java.time.LocalTime
 * java.time.ZonedDateTime
 * java.time.OffsetDateTime
 * java.time.OffsetTime
 * java.time.Period
 * java.time.Instant
 * 

 *
 * @author sheldon
 */
public class Jdk8DateConverter extends AbstractConverter {

    /**
     * 支持的JDK中的类名
     */
    private static final String[] SUPPORT_CLASS_NAMES = new String[]{
            "java.time.LocalDateTime",
            "java.time.LocalDate",
            "java.time.LocalTime",
            "java.time.ZonedDateTime",
            "java.time.OffsetDateTime",
            "java.time.OffsetTime",
            "java.time.Period",
            "java.time.Instant"
    };
    public static final List SUPPORT_CLASS_NAMES_LIST = Collections.unmodifiableList(Arrays.asList(SUPPORT_CLASS_NAMES));

    private Class targetType;
    /**
     * 日期格式化
     */
    private String format;

    /**
     * 构造
     *
     * @param targetType 目标类型
     */
    public Jdk8DateConverter(Class targetType) {
        this.targetType = targetType;
    }

    /**
     * 构造
     *
     * @param targetType 目标类型
     * @param format     日期格式
     */
    public Jdk8DateConverter(Class targetType, String format) {
        this.targetType = targetType;
        this.format = format;
    }

    /**
     * 获取日期格式
     *
     * @return 设置日期格式
     */
    public String getFormat() {
        return format;
    }

    /**
     * 设置日期格式
     *
     * @param format 日期格式
     */
    public void setFormat(String format) {
        this.format = format;
    }

    @Override
    protected Object convertInternal(Object value) {
        if (value instanceof Long) {
            return parseFromLong((Long) value);
        } else {
            return parseFromCharSequence(convertToStr(value));
        }
    }

    /**
     * 通过反射从字符串转java.time中的对象
     *
     * @param value 字符串值
     * @return 日期对象
     */
    private Object parseFromCharSequence(CharSequence value) {
        Method method;
        if (null != this.format) {
            final Object dateTimeFormatter = getDateTimeFormatter();
            method = ReflectUtil.getMethod(this.targetType, "parse", CharSequence.class, dateTimeFormatter.getClass());
            return ReflectUtil.invokeStatic(method, value, dateTimeFormatter);
        } else {
            method = ReflectUtil.getMethod(this.targetType, "parse", CharSequence.class);
            return ReflectUtil.invokeStatic(method, value);
        }
    }

    /**
     * 通过反射将Long型时间戳转换为java.time中的对象
     *
     * @param time 时间戳
     * @return java.time中的对象
     */
    private Object parseFromLong(Long time) {
        String targetName = this.targetType.getName();
        if ("java.time.Instant".equals(targetName)) {
            return toInstant(time);
        }
        return null;
    }

    /**
     * 反射获取java.time.format.DateTimeFormatter对象
     *
     * @return java.time.format.DateTimeFormatter对象
     */
    private Object getDateTimeFormatter() {
        if (null != this.format) {
            return ClassUtil.invoke("java.time.format.DateTimeFormatter.ofPattern", false, this.format);
        }
        return null;
    }

    /**
     * Long转 java.time.Instant
     *
     * @param time 时间戳
     * @return java.time.Instant
     */
    private Object toInstant(Long time) {
        return ClassUtil.invoke("java.time.Instant.ofEpochMilli", false, time);
    }

    @SuppressWarnings("unchecked")
    @Override
    public Class getTargetType() {
        return (Class) this.targetType;
    }
}
 















© 2015 - 2024 Weber Informatics LLC | Privacy Policy