EnumUtil 鏈表轉換工具類

package com.das.common.util;

import org.springframework.util.CollectionUtils;

import java.lang.reflect.InvocationTargetException;
import java.util.*;

/**
 * @Author liangmy
 * @Date 2018/3/8
 */
public class EnumUtil {
    private static final Integer doublePrecision = 1000;

    public static <T> List<EnumObject> getEnum(Class<T> enumClazz) {
        return getEnum(enumClazz, null, null);
    }

    public static <T> List<EnumObject> getEnum(Class<T> enumClazz, String value, String label) {
        Set<T> set = new TreeSet<>((o1, o2) -> {
            try {
                String typeName = o1.getClass().getMethod("getCode").getReturnType().getSimpleName();
                if (Double.class.getSimpleName().equalsIgnoreCase(typeName)) {
                    return (int) (((double) (o1.getClass().getMethod("getCode").invoke(o1))) * doublePrecision - ((double) (o2.getClass().getMethod("getCode").invoke(o2))) * doublePrecision);
                } else {
                    return (int) o1.getClass().getMethod("getCode").invoke(o1) - (int) o2.getClass().getMethod("getCode").invoke(o2);
                }
            } catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
                e.printStackTrace();
            }
            return 0;
        });
        set.addAll(Arrays.asList(enumClazz.getEnumConstants()));
        List<EnumObject> list = new LinkedList<>();
        String getValueMethodName = null == value ? "name" : "get" + value.substring(0, 1).toUpperCase() + value.substring(1);
        String getLabelMethodName = null == label ? "getValue" : "get" + label.substring(0, 1).toUpperCase() + label.substring(1);
        for (T e : set) {
            try {
                list.add(new EnumObject(enumClazz.getMethod(getValueMethodName).invoke(e).toString(), enumClazz.getMethod(getLabelMethodName).invoke(e).toString()));
            } catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException ex) {
                ex.printStackTrace();
            }
        }
        return list;
    }

    public static <T> List<EnumObject> getEnum(List<T> inputList) {
        if (CollectionUtils.isEmpty(inputList)) {
            return Collections.EMPTY_LIST;
        }
        if (inputList.get(0) instanceof Enum) {
            return getEnum(inputList.toArray(new Enum[0]));
        }
        return getEnum(inputList, "name");
    }


    public static <T> List<EnumObject> getEnum(List<T> inputList, String label) {
        if (CollectionUtils.isEmpty(inputList)) {
            return Collections.EMPTY_LIST;
        }
        if (inputList.get(0) instanceof Enum) {
            return getEnum(inputList.toArray(new Enum[0]), new String[]{label});
        }
        return getEnum(inputList, "id", label);
    }

    public static <T> List<EnumObject> getEnum(List<T> inputList, String value, String label) {
        if (CollectionUtils.isEmpty(inputList)) {
            return Collections.EMPTY_LIST;
        }
        if (inputList.get(0) instanceof Enum) {
            return getEnum(inputList.toArray(new Enum[0]), new String[]{value, label});
        }
        return getEnum(inputList, value, label, null);
    }

    public static <T> List<EnumObject> getEnum(List<T> inputList, String[] kwParam) {
        if (CollectionUtils.isEmpty(inputList)) {
            return Collections.EMPTY_LIST;
        }
        if (inputList.get(0) instanceof Enum) {
            return getEnum(inputList.toArray(new Enum[0]), kwParam);
        }

        return getEnum(inputList, "id", "name", kwParam);
    }

    public static <T> List<EnumObject> getEnum(List<T> inputList, String value, String label, String[] kwParam) {
        if (CollectionUtils.isEmpty(inputList)) {
            return Collections.EMPTY_LIST;
        }
        Iterator<T> iterator = inputList.iterator();
        while (iterator.hasNext()) {
            if (iterator.next() == null) {
                iterator.remove();
            }
        }
        Integer notNullIndex = 0;
        String getValueMethodName = inputList.get(notNullIndex) instanceof String ? "toString" :
                inputList.get(notNullIndex) instanceof Integer ? "intValue" :
                        inputList.get(notNullIndex) instanceof Long ? "longValue" :
                                inputList.get(notNullIndex) instanceof Double ? "doubleValue" :
                                        "get" + value.substring(0, 1).toUpperCase() + value.substring(1);
        String getLabelMethodName = inputList.get(notNullIndex) instanceof String ? "toString" :
                inputList.get(notNullIndex) instanceof Integer ? "intValue" :
                        inputList.get(notNullIndex) instanceof Long ? "longValue" :
                                inputList.get(notNullIndex) instanceof Double ? "doubleValue" :
                                        "get" + label.substring(0, 1).toUpperCase() + label.substring(1);
        Set<T> set = new TreeSet<>();
        if (!(inputList.get(notNullIndex) instanceof String)) {
            set = new TreeSet<>((T o1, T o2) -> {
                try {
                    Class<?> returnType = o1.getClass().getMethod(getValueMethodName).getReturnType();
                    if (Integer.class.isAssignableFrom(returnType) || Integer.TYPE.isAssignableFrom(returnType)) {
                        return (int) ((int) (o1.getClass().getMethod(getValueMethodName).invoke(o1)) - (int) (o2.getClass().getMethod(getValueMethodName).invoke(o2)));
                    } else if (Double.class.isAssignableFrom(returnType) || Double.TYPE.isAssignableFrom(returnType)) {
                        return (int) (((double) (o1.getClass().getMethod(getValueMethodName).invoke(o1))) * doublePrecision - ((double) (o2.getClass().getMethod(getValueMethodName).invoke(o2))) * doublePrecision);
                    } else if (Long.class.isAssignableFrom(returnType) || Long.TYPE.isAssignableFrom(returnType)) {
                        return (int) ((long) (o1.getClass().getMethod(getValueMethodName).invoke(o1)) - (long) (o2.getClass().getMethod(getValueMethodName).invoke(o2)));
                    }
                } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (Exception e) {
                    e.getStackTrace();
                }
                return -1;
            });
        }
        set.addAll(inputList);
        List<EnumObject> result = new LinkedList<>();
        for (T e : set) {
            if (null == e) {
                continue;
            }
            try {
                EnumObject enumObject = new EnumObject(e.getClass().getMethod(getValueMethodName).invoke(e).toString(), e.getClass().getMethod(getLabelMethodName).invoke(e).toString());
                if (null != kwParam && kwParam.length > 0) {
                    Map<String, String> kwMap = new HashMap<>(kwParam.length);
                    for (String key : kwParam) {
                        String word = e.getClass().getMethod("get" + key.substring(0, 1).toUpperCase() + key.substring(1)).invoke(e).toString();
                        kwMap.put(key, word);
                    }
                    enumObject.setKwParam(kwMap);
                }
                result.add(enumObject);
            } catch (IllegalAccessException e1) {
                e1.printStackTrace();
            } catch (InvocationTargetException e1) {
                e1.printStackTrace();
            } catch (NoSuchMethodException e1) {
                e1.printStackTrace();
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }
        return result;
    }

    public static List<EnumObject> getEnum(Enum... enums) {
        return getEnum(enums, null);
    }

    private static List<EnumObject> getEnum(Enum[] enums, String[] kwParam) {
        Set<Enum> set = new TreeSet<>((Enum o1, Enum o2) -> {
            try {
                String getValueMethodName = "getCode";
                Class<?> returnType = o1.getClass().getMethod(getValueMethodName).getReturnType();
                if (Integer.class.isAssignableFrom(returnType) || Integer.TYPE.isAssignableFrom(returnType)) {
                    return ((Integer) o1.getClass().getMethod(getValueMethodName).invoke(o1)).compareTo(((Integer) o2.getClass().getMethod(getValueMethodName).invoke(o2)));
                } else if (Double.class.isAssignableFrom(returnType) || Double.TYPE.isAssignableFrom(returnType)) {
                    return ((Double) o1.getClass().getMethod(getValueMethodName).invoke(o1)).compareTo(((Double) o2.getClass().getMethod(getValueMethodName).invoke(o2)));
                } else if (Long.class.isAssignableFrom(returnType) || Long.TYPE.isAssignableFrom(returnType)) {
                    return ((Long) o1.getClass().getMethod(getValueMethodName).invoke(o1)).compareTo((Long) o2.getClass().getMethod(getValueMethodName).invoke(o2));
                }
            } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.getStackTrace();
            }
            return -1;
        });
        set.addAll(Arrays.asList(enums));
        List<EnumObject> result = new LinkedList<>();
        for (Enum e : set) {
            try {
                EnumObject enumObject = new EnumObject(e.name(), e.getClass().getMethod("getValue").invoke(e).toString());
                if (null != kwParam && kwParam.length > 0) {
                    Map<String, String> kwMap = new HashMap<>(kwParam.length);
                    for (String key : kwParam) {
                        String word = e.getClass().getMethod("get" + key.substring(0, 1).toUpperCase() + key.substring(1)).invoke(e).toString();
                        kwMap.put(key, word);
                    }
                    enumObject.setKwParam(kwMap);
                }
                result.add(enumObject);
            } catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }


    public static class EnumObject {
        private String value;
        private String label;

        private Map<String, String> kwParam;

        public EnumObject(String value, String label) {
            this.value = value;
            this.label = label;
        }

        public EnumObject(String value, String label, Map<String, String> kwParam) {
            this.value = value;
            this.label = label;
            this.kwParam = kwParam;
        }

        public String getValue() {
            return value;
        }

        public String getLabel() {
            return label;
        }

        public Map<String, String> getKwParam() {
            return kwParam;
        }

        public void setKwParam(Map<String, String> kwParam) {
            this.kwParam = kwParam;
        }

        @Override
        public String toString() {
            return "EnumObject{" +
                    "value='" + value + '\'' +
                    ", label='" + label + '\'' +
                    '}';
        }

    }

    public static void main(String[] args) {
        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5);
        System.out.println(EnumUtil.getEnum(list));
    }

}