Morphiaは3つのカスタム注釈、変換器を学ぶ

カスタム注記

import java.lang.annotation.ElementType;  
import java.lang.annotation.Retention;  
import java.lang.annotation.RetentionPolicy;  
import java.lang.annotation.Target;  
@Retention(RetentionPolicy.RUNTIME)  
@Target({ElementType.FIELD})  
public  @interface Lowercase {  
}

@Entity  
public class MorphiaInfo {  
    private @Id String id;  
    //   
    @Lowercase  
    private String morphiaName;  
    private String version; 

import com.google.code.morphia.EntityInterceptor;  
import com.google.code.morphia.mapping.MappedClass;  
import com.google.code.morphia.mapping.MappedField;  
import com.google.code.morphia.mapping.Mapper;  
import com.mongodb.DBObject;  
/** 
 *   
 */  
public class ToLowercaseHelper implements EntityInterceptor {  
      
    public void postLoad(Object ent, DBObject dbObj, Mapper mapr) {}        
    public void postPersist(Object ent, DBObject dbObj, Mapper mapr) {}  
    /** 
     *   
     */  
    public void preSave(Object ent, DBObject dbObj, Mapper mapr) {}  
  
    /** 
     *   
     */  
    public void preLoad(Object ent, DBObject dbObj, Mapper mapr) {}  
  
    /** 
     *   
     * (non-Javadoc) 
     * @see com.google.code.morphia.EntityInterceptor#prePersist(java.lang.Object, com.mongodb.DBObject, com.google.code.morphia.mapping.Mapper) 
     */  
    public void prePersist(Object ent, DBObject dbObj, Mapper mapr) {  
        //   
        MappedClass mc = mapr.getMappedClass(ent);  
        //   
        List<MappedField> toLowercase = mc.getFieldsAnnotatedWith(Lowercase.class);  
        //   
        for (MappedField mf : toLowercase) {  
            try {  
                Object fieldValue = mf.getFieldValue(ent);  
                dbObj.put(mf.getNameToStore() + "_lowercase", fieldValue.toString().toLowerCase());  
            } catch (Exception e) {  
                throw new RuntimeException(e);  
            }  
        }  
    }  
}