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

        ValueHolder holder = (ValueHolder) accessor.getValue(object);
        return holder == null || holder.isFault();
    }


    public void invalidate(Object object) {
        ValueHolder holder = (ValueHolder) accessor.getValue(object);
        if (holder != null && !holder.isFault()) {
            holder.invalidate();
        }
    }

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        }
    }


    @Override
    public Object readPropertyDirectly(Object object) throws PropertyException {
        ValueHolder holder = (ValueHolder) accessor.getValue(object);


        // TODO: Andrus, 2/9/2006 ValueHolder will resolve an object in a call to
        // 'getValue'; this is inconsistent with 'readPropertyDirectly' contract
        return (holder != null) ? holder.getValueDirectly() : null;
    }

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    @Override
    public void writePropertyDirectly(Object object, Object oldValue, Object newValue)
            throws PropertyException {


        ValueHolder holder = (ValueHolder) accessor.getValue(object);
        if (holder == null) {
            holder = createValueHolder(object);
            accessor.setValue(object, holder);
        }


        holder.setValueDirectly(newValue);
    }

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     * Checks that an object's ValueHolder field described by this property is set,
     * injecting a ValueHolder if needed.
     */
    protected ValueHolder ensureValueHolderSet(Object object) throws PropertyException {


        ValueHolder holder = (ValueHolder) accessor.getValue(object);
        if (holder == null) {
            holder = createValueHolder(object);
            accessor.setValue(object, holder);
        }

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            accessor.setValue(object, value);
        }
        else if (!(value instanceof ValueHolder)) {


            if (value instanceof Collection || value instanceof Map) {
                ValueHolder valueHolder = createCollectionValueHolder(object);
                valueHolder.setValueDirectly(value);


                accessor.setValue(object, valueHolder);
                value = valueHolder;
            }
        }

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                || target instanceof Fault
                || ((ValueHolder) target).isFault();
    }


    public void invalidate(Object object) {
        ValueHolder list = (ValueHolder) readPropertyDirectly(object);
        if (list != null) {
            list.invalidate();
        }
    }

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                || target instanceof Fault
                || ((ValueHolder) target).isFault();
    }


    public void invalidate(Object object) {
        ValueHolder list = (ValueHolder) readPropertyDirectly(object);
        if (list != null) {
            list.invalidate();
        }
    }

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        }
    }


    private final void connect(Persistent object, List related) {
        if (incoming.getRelationship().isToMany()) {
            ValueHolder toManyList = (ValueHolder) incoming.readProperty(object);


            // TODO, Andrus 11/15/2005 - if list is modified, shouldn't we attempt to
            // merge the changes instead of overwriting?
            toManyList.setValueDirectly(related != null ? related : new ArrayList(1));
        }
        else {
            // this should've been handled elsewhere
            throw new CayenneRuntimeException(
                    "To-one relationship wasn't handled properly: " + incoming.getName());

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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...
            g1 = (DataObject) context.getGraphManager().getNode(
                    new ObjectId("Gallery", Gallery.GALLERY_ID_PK_COLUMN, 33001));

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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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Related Classes of org.apache.cayenne.ValueHolder

org.apache.cayenne.access.ClientServerChannelQueryTest

org.apache.cayenne.access.JointPrefetchTest

org.apache.cayenne.access.PrefetchProcessorNode

org.apache.cayenne.jpa.reflect.JpaToManyProperty

org.apache.cayenne.property.AbstractCollectionProperty

org.apache.cayenne.property.ValueHolderProperty

org.apache.cayenne.reflect.BaseToManyProperty

org.apache.cayenne.reflect.ListProperty

org.apache.cayenne.reflect.pojo.EnhancedPojoToManyProperty

org.apache.cayenne.reflect.valueholder.ValueHolderProperty

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