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

                || 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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    /**
     * Returns true if a property ValueHolder is not initialized or is itself a fault.
     */
    @Override
    public boolean isFault(Object object) {
        ValueHolder holder = (ValueHolder) accessor.getValue(object);
        return holder == null || holder.isFault();
    }

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        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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                    "ValueHolders for non-persistent objects are not supported.",
                    this,
                    object);
        }


        ValueHolder holder = createValueHolder((Persistent) object);
        faultHandler.setFaultProperty(object, false);
        return holder;
    }

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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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        }
    }


    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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org.apache.cayenne.property.AbstractCollectionProperty

org.apache.cayenne.property.ValueHolderProperty

org.apache.cayenne.reflect.BaseToManyProperty

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org.apache.cayenne.reflect.valueholder.ValueHolderProperty

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