Examples of org.jboss.dna.graph.property.Property

org.jboss.dna.graph.property.Property
Representation of a property consisting of a name and value(s). Note that this property is immutable, meaning that the property values may not be changed through this interface.
This class is designed to be used with the {@link ValueFactories} interface and the particular {@link ValueFactory} thatcorresponds to the type of value you'd like to use. The ValueFactory will then return the values (if no type conversion is required) or will convert the values using the appropriate conversion algorithm.

The following example shows how to obtain the {@link String} representations of the {@link #getValues() property values}:
```
 ValueFactories valueFactories = ... Property property = ... Iterator<String> iter = valueFactories.getStringFactory().create(property.getValues()); while ( iter.hasNext() ) { System.out.println(iter.next()); } 
```
Meanwhile, the {@link ValueFactories#getLongFactory() long value factory} converts the values to long, the{@link ValueFactories#getDateFactory() date value factory} converts the values to {@link DateTime} instances, and so on.

This technique is much better and far safer than casting the values. It is possible that some Property instances contain heterogeneous values, so casting may not always work. Also, this technique guarantees that the values are properly converted if the type is not what you expected.

            try {
                Path optionsPath = context.getValueFactories().getPathFactory().create(path, DnaLexicon.OPTIONS);
                Subgraph options = batch.getGraph().getSubgraphOfDepth(2).at(optionsPath);
                for (Location optionChild : options.getRoot().getChildren()) {
                    Node option = options.getNode(optionChild);
                    Property property = option.getProperty(DnaLexicon.VALUE);
                    if (property != null && property.isEmpty()) {
                        try {
                            Option key = Option.findOption(optionChild.getPath()
                                                                      .getLastSegment()
                                                                      .getString(context.getNamespaceRegistry()));
                            String value = context.getValueFactories().getStringFactory().create(property.getFirstValue());
                            optionValues.put(key, value);
                        } catch (IllegalArgumentException e) {
                            // the key is not valid, so skip it ...
                        }
                    }

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            setProperty(DnaLexicon.SOURCE_NAME, sourceName);
            return this;
        }


        public String getSource() {
            Property property = getProperty(DnaLexicon.SOURCE_NAME);
            if (property != null && !property.isEmpty()) {
                return context.getValueFactories().getStringFactory().create(property.getFirstValue());
            }
            return null;
        }

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     * @see Location#getIdProperty(Name)
     */
    @Override
    public final Property getIdProperty( Name name ) {
        CheckArg.isNotNull(name, "name");
        Property property = getIdProperties().get(0); // this is fast
        return property.getName().equals(name) ? property : null;
    }

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     * 
     * @see Location#getUuid()
     */
    @Override
    public UUID getUuid() {
        Property property = getIdProperties().get(0); // this is fast
        if (DnaLexicon.UUID.equals(property.getName())) {
            Object value = property.getFirstValue();
            if (value instanceof UUID) return (UUID)value;
            if (value instanceof String) return UUID.fromString((String)value);
        }
        return null;
    }

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     * @see Location#with(Property)
     */
    @Override
    public Location with( Property newIdProperty ) {
        if (newIdProperty == null || newIdProperty.isEmpty()) return this;
        Property idProperty = getIdProperties().get(0); // fast
        if (newIdProperty.getName().equals(idProperty.getName())) {
            return Location.create(newIdProperty);
        }
        List<Property> newIdProperties = new ArrayList<Property>(getIdProperties().size() + 1);
        newIdProperties.add(newIdProperty);
        newIdProperties.addAll(getIdProperties());

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     * @see Location#with(Path)
     */
    @Override
    public Location with( Path newPath ) {
        if (newPath == null) return this;
        Property idProperty = getIdProperties().get(0); // fast
        return Location.create(newPath, idProperty);
    }

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     * @see Location#with(UUID)
     */
    @Override
    public Location with( UUID uuid ) {
        if (uuid == null) return this;
        Property idProperty = getIdProperties().get(0); // fast
        if (DnaLexicon.UUID.equals(idProperty.getName())) {
            return Location.create(uuid);
        }
        List<Property> newIdProperties = new ArrayList<Property>(getIdProperties().size() + 1);
        newIdProperties.add(new BasicSingleValueProperty(DnaLexicon.UUID, uuid));
        newIdProperties.addAll(getIdProperties());

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        process(readNode);
        if (readNode.hasError()) {
            request.setError(readNode.getError());
            return;
        }
        Property property = readNode.getPropertiesByName().get(request.named());
        request.setProperty(property);
        // Set the actual location ...
        request.setActualLocationOfNode(readNode.getActualLocationOfNode());
        setCacheableInfo(request);
    }

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     * 
     * @param request the request to set the property
     */
    public void process( SetPropertyRequest request ) {
        if (request == null) return;
        Property property = request.property();
        Map<Name, Property> properties = Collections.singletonMap(property.getName(), property);
        UpdatePropertiesRequest update = new UpdatePropertiesRequest(request.on(), request.inWorkspace(), properties);
        process(update);
        if (update.hasError()) {
            request.setError(update.getError());
        } else {
            // Set the actual location and created flags ...
            request.setActualLocationOfNode(update.getActualLocationOfNode());
            request.setNewProperty(update.isNewProperty(property.getName()));
        }
    }

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        if (readProperty.hasError()) {
            request.setError(readProperty.getError());
            return;
        }


        Property property = readProperty.getProperty();
        List<Object> actualRemovedValues = new ArrayList<Object>(request.removedValues().size());
        List<Object> newValues = property == null ? new LinkedList<Object>() : new LinkedList<Object>(
                                                                                                      Arrays.asList(property.getValuesAsArray()));
        // Calculate what the new values should be
        for (Object removedValue : request.removedValues()) {
            for (Iterator<Object> iter = newValues.iterator(); iter.hasNext();) {
                if (iter.next().equals(removedValue)) {
                    iter.remove();
                    actualRemovedValues.add(removedValue);
                    break;
                }
            }
        }


        newValues.addAll(request.addedValues());
        Property newProperty = getExecutionContext().getPropertyFactory().create(propertyName, newValues);


        // Update the current values
        SetPropertyRequest setProperty = new SetPropertyRequest(on, workspaceName, newProperty);
        process(setProperty);

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