如何自定义语法与其他语句进行映射

1、如何自定义注解与hbase的api进行通信，自动进行类映射

2、如何定义一个对象 与sql中语法进行匹配

各种场景，都可以写一个针对特定软件的语法，进映射

package hbase;  import org.apache.commons.lang3.StringUtils; import org.apache.hadoop.hbase.client.Put; import org.apache.hadoop.hbase.client.Row; import org.apache.hadoop.hbase.util.Bytes; import org.springframework.beans.factory.InitializingBean;  import java.io.File; import java.lang.reflect.Field; import java.util.ArrayList; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; import java.util.stream.Stream;  public abstract class AbstractHbaseService<DO> implements InitializingBean {       private final Map<String, Field> columnFieldMap=new LinkedHashMap<>();      private static final ConcurrentHashMap<Class, List<Field>> query_field_cache=new ConcurrentHashMap();      protected abstract Class<DO> getHbaseDOClass();       protected Row convertToRow(DO doObj) throws IllegalAccessException {        return convertToRow(doObj,null);     }      protected DO convertToDO(Row rowObj) throws InstantiationException, IllegalAccessException {         DO doObj=getHbaseDOClass().newInstance();         for(Map.Entry<String,Field> entry:columnFieldMap.entrySet()){             byte[] row = rowObj.getRow();             entry.getValue().set(doObj,row);         }         return doObj;     }       protected Row convertToRow(DO doObj,Long tsLong) throws IllegalAccessException {         for(Map.Entry<String,Field> entry:columnFieldMap.entrySet()){             Object value=entry.getValue().get(doObj);             if(value!=null){                 if(tsLong==null){                     return new Put(Bytes.toBytes((String)value));                 }else {                     return new Put(Bytes.toBytes((String)value));                 }             }         }         return null;     }       private List<Field> getIndexFields(BaseQueryParams queryParams){         List<Field> fieldList=query_field_cache.get(queryParams.getClass());         if(fieldList!=null){             return fieldList;         }         fieldList=new ArrayList<>();         for(Field field:queryParams.getClass().getDeclaredFields()){             HbaseIndex index=field.getAnnotation(HbaseIndex.class);             if(index==null){                 continue;             }             fieldList.add(field);         }         query_field_cache.put(queryParams.getClass(),fieldList);         return fieldList;     }      private Object getFieldValue(Field field,Object input){         Object fieldValue=null;         try {             field.setAccessible(true);             fieldValue=field.get(input);         }catch (Exception e){          }         return fieldValue;     }      protected List<Row> buildHbaseQuery(BaseQueryParams queryParams){         List<Row> conditions=new ArrayList<>();         for(Field field :getIndexFields(queryParams)){             HbaseIndex index=field.getAnnotation(HbaseIndex.class);             if(index==null|| index.relation()==null){                 continue;             }             Object fieldObjct=getFieldValue(field,queryParams);             if(fieldObjct==null){                 continue;             }             if(index.relation().getOp()!=null){                 //此处就是把自定义的与hbase的请求进行映射，             }         }         return conditions;     }       @Override     public void afterPropertiesSet() throws Exception {         buildFieldMap(getHbaseDOClass());         if(getHbaseDOClass().getSuperclass()!=null){             buildFieldMap(getHbaseDOClass().getSuperclass());         }     }      private void  buildFieldMap(Class c){         Field[] fields = c.getDeclaredFields();         Stream.of(fields).forEach(field -> {             HbaseColumn column=field.getAnnotation(HbaseColumn.class);             if(column==null|| StringUtils.isBlank(column.name())){                 return;             }             if(!field.isAccessible()){                 field.setAccessible(true);             }             columnFieldMap.put(column.name(),field);         });     } } 

package hbase;  public abstract class BaseQueryParams {      private Integer pageSize=10;      private int start=0;      public Integer getPageSize() {         return pageSize;     }      public void setPageSize(Integer pageSize) {         this.pageSize = pageSize;     }      public int getStart() {         return start;     }      public void setStart(int start) {         this.start = start;     } } 

package hbase;  import java.lang.annotation.*;  @Target(ElementType.FIELD) @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface HbaseColumn {      String name() default ""; } 

package hbase;  import java.lang.annotation.*;  @Target(ElementType.FIELD) @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface HbaseIndex {      String name() default "";       HbaseRelationEnum relation() default HbaseRelationEnum.EQUAL;  } 

package hbase;  import org.apache.hadoop.hbase.filter.CompareFilter; import org.apache.hadoop.hbase.filter.RowFilter;  public enum HbaseRelationEnum {     LESS("<", CompareFilter.CompareOp.LESS),      LESS_OR_EQUAL("<=", CompareFilter.CompareOp.LESS_OR_EQUAL),      EQUAL("=", CompareFilter.CompareOp.EQUAL),      NOT_EQUAL("<>", CompareFilter.CompareOp.NOT_EQUAL),      GREATER_OR_EQUAL(">=", CompareFilter.CompareOp.GREATER_OR_EQUAL),      GREATERL(">", CompareFilter.CompareOp.GREATER),      IN("in",null),      NOT_IN("not in",null);     ;      private String code;      private RowFilter.CompareOp op;       HbaseRelationEnum(String code, RowFilter.CompareOp op) {         this.code = code;         this.op = op;     }      public String getCode() {         return code;     }      public void setCode(String code) {         this.code = code;     }      public RowFilter.CompareOp getOp() {         return op;     }      public void setOp(RowFilter.CompareOp op) {         this.op = op;     } }