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Hibernate recursive initialization

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孤街浪徒
孤街浪徒 2021-01-01 16:54

i am writing one function in hibernate to recursively initialize all properties of object recursively so whole object graph is loaded.

i have two complex scenarios w

2条回答
  • 说谎
    说谎 (楼主)
    2021-01-01 17:29

    Full code:

    public  T recursiveInitliaze(T obj) {
    Set dejaVu = Collections.newSetFromMap(new IdentityHashMap());
    try {
        recursiveInitliaze(obj, dejaVu);
    } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
        ReflectionUtils.handleReflectionException(e);
    }
    return obj;
}

private void recursiveInitliaze(Object obj, Set dejaVu) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
    if (dejaVu.contains(this)) {
        return;
    } else {
        dejaVu.add(this);

        if (!Hibernate.isInitialized(obj)) {
            Hibernate.initialize(obj);
        }
        PropertyDescriptor[] properties = PropertyUtils.getPropertyDescriptors(obj);
        for (PropertyDescriptor propertyDescriptor : properties) {
            Object origProp = PropertyUtils.getProperty(obj, propertyDescriptor.getName());
            if (origProp != null) {
                this.recursiveInitliaze(origProp, dejaVu);
            }
            if (origProp instanceof Collection && origProp != null) {
                for (Object item : (Collection) origProp) {
                    this.recursiveInitliaze(item, dejaVu);
                }
            }
        }
    }
}



    Code of ReflectionUtils:
    


    /**
 * Handle the given reflection exception. Should only be called if no
 * checked exception is expected to be thrown by the target method.
 * 
    Throws the underlying RuntimeException or Error in case of an
 * InvocationTargetException with such a root cause. Throws an
 * IllegalStateException with an appropriate message else.
 * @param ex the reflection exception to handle
 */
public static void handleReflectionException(Exception ex) {
    if (ex instanceof NoSuchMethodException) {
        throw new IllegalStateException("Method not found: " + ex.getMessage());
    }
    if (ex instanceof IllegalAccessException) {
        throw new IllegalStateException("Could not access method: " + ex.getMessage());
    }
    if (ex instanceof InvocationTargetException) {
        handleInvocationTargetException((InvocationTargetException) ex);
    }
    if (ex instanceof RuntimeException) {
        throw (RuntimeException) ex;
    }
    throw new UndeclaredThrowableException(ex);
}

    
    
    
             
    
                                                        
    
            
            
    
              
                
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