objectconverter.java

Ajax 框架,可以用来做数型菜单或者联动下拉列表

                        {
                            all.append(',');
                        }
                    }
                    log.warn("Fields exist for (" + all + ")."); //$NON-NLS-1$ //$NON-NLS-2$
                }
                else
                {
                    Class propType = field.getType();

                    String[] split = LocalUtil.splitInbound(val);
                    String splitValue = split[LocalUtil.INBOUND_INDEX_VALUE];
                    String splitType = split[LocalUtil.INBOUND_INDEX_TYPE];

                    InboundVariable nested = new InboundVariable(iv.getLookup(), null, splitType, splitValue);

                    if (!field.isAccessible())
                    {
                        if (force)
                        {
                            field.setAccessible(true);
                        }
                        else
                        {
                            log.debug("Field: " + field.getName() + " is not accessible. use <param name='force' value='true'/>"); //$NON-NLS-1$ //$NON-NLS-2$
                            continue;
                        }
                    }

                    Object output = config.convertInbound(propType, nested, inctx, inctx.getCurrentTypeHintContext());
                    field.set(bean, new Object[] { output });
                }
            }

            return bean;
        }
        catch (MarshallException ex)
        {
            throw ex;
        }
        catch (Exception ex)
        {
            throw new MarshallException(ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertOutbound(java.lang.Object, org.directwebremoting.OutboundContext)
     */
    public OutboundVariable convertOutbound(Object data, OutboundContext outctx) throws MarshallException
    {
        // Where we collect out converted children
        Map ovs = new TreeMap();

        OutboundVariable ov = outctx.createOutboundVariable(data);

        try
        {
            Field[] fields = getAllFields(data);
            for (int i = 0; i < fields.length; i++)
            {
                Field field = fields[i];
                String name = field.getName();

                try
                {
                    // We don't marshall getClass()
                    if (name.equals("class")) //$NON-NLS-1$
                    {
                        continue;
                    }

                    // Access rules mean we might not want to do this one
                    if (!isAllowed(name))
                    {
                        log.debug("Skipping marshalling " + name + " due to include/exclude rules"); //$NON-NLS-1$ //$NON-NLS-2$
                        continue;
                    }

                    if (!isAvailable(data, name))
                    {
                        log.debug("Skipping marshalling " + name + " due to availability rules"); //$NON-NLS-1$ //$NON-NLS-2$
                        continue;
                    }

                    if (!field.isAccessible())
                    {
                        if (force)
                        {
                            field.setAccessible(true);
                        }
                        else
                        {
                            log.debug("Field: " + field.getName() + " is not accessible. use <param name='force' value='true'/>"); //$NON-NLS-1$ //$NON-NLS-2$
                            continue;
                        }
                    }

                    Object value = field.get(data);
                    OutboundVariable nested = getConverterManager().convertOutbound(value, outctx);

                    ovs.put(name, nested);
                }
                catch (Exception ex)
                {
                    log.warn("Failed to convert " + name, ex); //$NON-NLS-1$
                }
            }
        }
        catch (Exception ex)
        {
            throw new MarshallException(ex);
        }

        ConverterUtil.addMapInit(ov, ovs);
        return ov;
    }

    /**
     * Get the fields from a bean. You can't use <code>class.getFields()</code>
     * in place of this because it only gives you accessible fields, and
     * although <code>class.getDeclaredFields()</code> does give in-accessible
     * fields is doesn't walk up the tree.
     * @param bean The class to find bean info from
     * @return An array of all the fields for the given object
     */
    protected Field[] getAllFields(Object bean)
    {
        Set allFields = new HashSet();

        Class clazz = bean.getClass();

        while (clazz != Object.class)
        {
            Field[] fields = clazz.getDeclaredFields();
            for (int i = 0; i < fields.length; i++)
            {
                allFields.add(fields[i]);
            }

            clazz = clazz.getSuperclass();
        }

        return (Field[]) allFields.toArray(new Field[allFields.size()]);
    }

    /**
     * Check with the access rules to see if we are allowed to convert a property
     * @param property The property to test
     * @return true if the property may be marshalled
     */
    protected boolean isAllowed(String property)
    {
        if (exclusions != null)
        {
            // Check each exclusions and return false if we get a match
            for (Iterator it = exclusions.iterator(); it.hasNext();)
            {
                String test = (String) it.next();
                if (property.equals(test))
                {
                    return false;
                }
            }

            // So we passed all the exclusions. The setters enforce mutual
            // exclusion between exclusions and inclusions so we don't need to
            // 'return true' here, we can carry on. This has the advantage that
            // we can relax the mutual exclusion at some stage.
        }

        if (inclusions != null)
        {
            // Check each inclusion and return true if we get a match
            for (Iterator it = inclusions.iterator(); it.hasNext();)
            {
                String test = (String) it.next();
                if (property.equals(test))
                {
                    return true;
                }
            }

            // Since we are white-listing with inclusions and there was not
            // match, this property is not allowed.
            return false;
        }

        // default to allow if there are no inclusions or exclusions
        return true;
    }

    /**
     * Some child converters (like Hibernate at least) need to check that a
     * property should be marshalled. This allows them to veto a marshal
     * @param data The object to check on
     * @param property The property of the <code>data</code> object
     * @return true if we should continue and marshall it.
     */
    public boolean isAvailable(Object data, String property)
    {
        return true;
    }

    /**
     * Do we force accessibillity for hidden fields
     */
    private boolean force;

    /**
     * The list of excluded properties
     */
    private List exclusions = null;

    /**
     * The list of included properties
     */
    private List inclusions = null;

    /**
     * A type that allows us to fulfill an interface or subtype requirement
     */
    private Class instanceType = null;

    /**
     * The log stream
     */
    private static final Logger log = Logger.getLogger(ObjectConverter.class);

    /**
     * To forward marshalling requests
     */
    private ConverterManager config = null;
}