Examples of com.vaadin.data.Property

com.vaadin.data.Property

The Property is a simple data object that contains one typed value. This interface contains methods to inspect and modify the stored value and its type, and the object's read-only state.

The Property also defines the events ReadOnlyStatusChangeEvent and ValueChangeEvent, and the associated listener and notifier interfaces.

The Property.Viewer interface should be used to attach the Property to an external data source. This way the value in the data source can be inspected using the Property interface.

The Property.editor interface should be implemented if the value needs to be changed through the implementing class.
@param T type of values of the property @author Vaadin Ltd @since 3.0

        final Field field = fields.get(id);
        if (field == null) {
            // field does not exist or it is not (yet) created for this property
            return ownProperties.get(id);
        }
        final Property property = field.getPropertyDataSource();


        if (property != null) {
            return property;
        } else {
            return field;

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        }


        // Adds all the properties to this form
        for (final Iterator<?> i = propertyIds.iterator(); i.hasNext();) {
            final Object id = i.next();
            final Property property = itemDatasource.getItemProperty(id);
            if (id != null && property != null) {
                final Field f = fieldFactory.createField(itemDatasource, id,
                        this);
                if (f != null) {
                    f.setPropertyDataSource(property);

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                        descriptions[i].toString());
            }
        }


        // Sets the property data source
        final Property property = oldField.getPropertyDataSource();
        oldField.setPropertyDataSource(null);
        newField.setPropertyDataSource(property);


        // Replaces the old field with new one
        layout.replaceComponent(oldField, newField);

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            for (int j = 0; j < cols; j++) {
                if (isColumnCollapsed(colids[j])) {
                    continue;
                }
                Property p = null;
                Object value = "";
                boolean isGeneratedRow = generatedRow != null;
                boolean isGeneratedColumn = columnGenerators
                        .containsKey(colids[j]);
                boolean isGenerated = isGeneratedRow || isGeneratedColumn;


                if (!isGenerated) {
                    p = getContainerProperty(id, colids[j]);
                }


                if (isGeneratedRow) {
                    if (generatedRow.isSpanColumns() && j > 0) {
                        value = null;
                    } else if (generatedRow.isSpanColumns() && j == 0
                            && generatedRow.getValue() instanceof Component) {
                        value = generatedRow.getValue();
                    } else if (generatedRow.getText().length > j) {
                        value = generatedRow.getText()[j];
                    }
                } else {
                    // check in current pageBuffer already has row
                    int index = firstIndex + i;
                    if (p != null || isGenerated) {
                        int indexInOldBuffer = index - pageBufferFirstIndex;
                        if (index < firstIndexNotInCache
                                && index >= pageBufferFirstIndex
                                && pageBuffer[CELL_GENERATED_ROW][indexInOldBuffer] == null
                                && pageBuffer[CELL_ITEMID][indexInOldBuffer] == id) {
                            // we already have data in our cache,
                            // recycle it instead of fetching it via
                            // getValue/getPropertyValue
                            value = pageBuffer[CELL_FIRSTCOL + j][indexInOldBuffer];
                            if (!isGeneratedColumn && iscomponent[j]
                                    || !(value instanceof Component)) {
                                listenProperty(p, oldListenedProperties);
                            }
                        } else {
                            if (isGeneratedColumn) {
                                ColumnGenerator cg = columnGenerators
                                        .get(colids[j]);
                                value = cg.generateCell(this, id, colids[j]);
                                if (value != null
                                        && !(value instanceof Component)
                                        && !(value instanceof String)) {
                                    // Avoid errors if a generator returns
                                    // something
                                    // other than a Component or a String
                                    value = value.toString();
                                }
                            } else if (iscomponent[j]) {
                                value = p.getValue();
                                listenProperty(p, oldListenedProperties);
                            } else if (p != null) {
                                value = getPropertyValue(id, colids[j], p);
                                /*
                                 * If returned value is Component (via

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                        if (cellVal instanceof Component
                                && visibleComponents.contains(cellVal)) {
                            visibleComponents.remove(cellVal);
                            unregisterComponent((Component) cellVal);
                        } else {
                            Property p = getContainerProperty(
                                    pageBuffer[CELL_ITEMID][i + ix], colids[c]);
                            if (p instanceof ValueChangeNotifier
                                    && listenedProperties.contains(p)) {
                                listenedProperties.remove(p);
                                ((ValueChangeNotifier) p).removeListener(this);

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     *            The {@link Item} that contains the property
     * @param propertyId
     *            The id of the property
     */
    private void addValueChangeListener(Item item, Object propertyId) {
        Property property = item.getItemProperty(propertyId);
        if (property instanceof ValueChangeNotifier) {
            // avoid multiple notifications for the same property if
            // multiple filters are in use
            ValueChangeNotifier notifier = (ValueChangeNotifier) property;
            notifier.removeListener(this);

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         * Also remove property data sources to unregister listeners keeping the
         * fields in memory.
         */
        if (component instanceof Field) {
            Field field = (Field) component;
            Property associatedProperty = associatedProperties
                    .remove(component);
            if (associatedProperty != null
                    && field.getPropertyDataSource() == associatedProperty) {
                // Remove the property data source only if it's the one we
                // added in getPropertyValue

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     *            The {@link Item} that contains the property
     * @param propertyId
     *            The id of the property
     */
    private void removeValueChangeListener(Item item, Object propertyId) {
        Property property = item.getItemProperty(propertyId);
        if (property instanceof ValueChangeNotifier) {
            ((ValueChangeNotifier) property).removeListener(this);
        }
    }

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            if (null == pd) {
                throw new IllegalStateException("Property " + propertyId
                        + " not found");
            }
            try {
                Property property = pd.createProperty(bean);
                return (IDTYPE) property.getValue();
            } catch (MethodException e) {
                throw new IllegalArgumentException(e);
            }
        }

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        final Field field = fields.get(id);
        if (field == null) {
            // field does not exist or it is not (yet) created for this property
            return ownProperties.get(id);
        }
        final Property property = field.getPropertyDataSource();


        if (property != null) {
            return property;
        } else {
            return field;

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