Examples of org.apache.cayenne.ValueHolder

org.apache.cayenne.ValueHolder
Provides a level of indirection for property value access, most often used for deferred faulting of to-one relationships. A ValueHolder abstracts how a property value is obtained (fetched from DB, etc.), thus simplifying design of an object that uses it.
Here is an example of a bean property implemented using ValueHolder:
```
 protected ValueHolder someProperty; public SomeClass getSomeProperty() { return (SomeClass) somePropertyHolder.getValue(SomeClass.class); } public void setSomeProperty(SomeClass newValue) { somePropertyHolder.setValue(SomeClass.class, newValue); } 
```
@since 1.2

        if (newValue instanceof Fault) {
            super.writePropertyDirectly(object, null, newValue);
        }
        else {
            // must resolve value holder...
            ValueHolder holder = (ValueHolder) readProperty(object);
            holder.setValueDirectly(newValue);
        }
    }

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    ValueHolder getWrappedValueHolder() {
        return (list instanceof ValueHolder) ? (ValueHolder) list : null;
    }


    public boolean isFault() {
        ValueHolder h = getWrappedValueHolder();
        return (h != null) ? h.isFault() : false;
    }

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        ValueHolder h = getWrappedValueHolder();
        return (h != null) ? h.isFault() : false;
    }


    public Object setValueDirectly(Object value) throws CayenneRuntimeException {
        ValueHolder h = getWrappedValueHolder();
        return h != null ? h.setValueDirectly(value) : null;
    }

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        ValueHolder h = getWrappedValueHolder();
        return h != null ? h.setValueDirectly(value) : null;
    }


    public Object setValue(Object value) throws CayenneRuntimeException {
        ValueHolder h = getWrappedValueHolder();
        return h != null ? h.setValue(value) : null;
    }

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        ValueHolder h = getWrappedValueHolder();
        return h != null ? h.setValue(value) : null;
    }


    public Object getValue() throws CayenneRuntimeException {
        ValueHolder h = getWrappedValueHolder();
        return h != null ? h.getValue() : null;
    }

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        ValueHolder h = getWrappedValueHolder();
        return h != null ? h.getValue() : null;
    }
    
    public Object getValueDirectly() throws CayenneRuntimeException {
        ValueHolder h = getWrappedValueHolder();
        return h != null ? h.getValueDirectly() : null;
    }

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        ValueHolder h = getWrappedValueHolder();
        return h != null ? h.getValueDirectly() : null;
    }


    public void invalidate() {
        ValueHolder h = getWrappedValueHolder();
        if (h != null) {
            h.invalidate();
        }
    }

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        assertEquals(1, results.size());


        ClientMtTable2 result = (ClientMtTable2) results.get(0);


        ValueHolder holder = result.getTable1Direct();
        assertNotNull(holder);
        assertTrue(holder instanceof PersistentObjectHolder);
        PersistentObjectHolder objectHolder = (PersistentObjectHolder) holder;
        assertFalse(objectHolder.isFault());

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                assertEquals(3, objects.size());


                Iterator<?> it = objects.iterator();
                while (it.hasNext()) {
                    Artist a = (Artist) it.next();
                    ValueHolder list = (ValueHolder) a.getPaintingArray();


                    assertNotNull(list);


                    // intermediate relationship is not fetched...
                    assertTrue(list.isFault());
                }


                // however both galleries must be in memory...
                DataObject g1 = (DataObject) context.getGraphManager().getNode(
                        new ObjectId("Gallery", Gallery.GALLERY_ID_PK_COLUMN, 33001));

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        if (newValue instanceof Fault) {
            super.writePropertyDirectly(object, null, newValue);
        }
        else {
            // must resolve value holder...
            ValueHolder holder = (ValueHolder) readProperty(object);
            holder.setValueDirectly(newValue);
        }
    }

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