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.

    protected String readUriFor( String prefix ) {
        // Read the store ...
        try {
            PathFactory pathFactory = store.getContext().getValueFactories().getPathFactory();
            Path pathToNamespaceNode = pathFactory.create(parentOfNamespaceNodes, prefix);
            Property uri = store.getProperty(uriPropertyName).on(pathToNamespaceNode);
            // Get the URI property value ...
            ValueFactory<String> stringFactory = store.getContext().getValueFactories().getStringFactory();
            return stringFactory.create(uri.getFirstValue());
        } catch (PathNotFoundException e) {
            // Nothing to read
            return null;
        }
    }

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            }
            if (generateIfMissing) {
                // Generated prefixes are simply "ns" followed by the SNS index ...
                PathFactory pathFactory = store.getContext().getValueFactories().getPathFactory();
                Path pathToNamespaceNode = pathFactory.create(parentOfNamespaceNodes, GENERATED_PREFIX);
                Property uriProperty = store.getContext().getPropertyFactory().create(uriPropertyName, namespaceUri);
                List<Property> props = new ArrayList<Property>(namespaceProperties);
                props.add(uriProperty);
                // Location actualLocation = store.createIfMissing(pathToNamespaceNode, props).andReturn().getLocation();
                store.create(pathToNamespaceNode, props).ifAbsent().and();

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     * Get the first UUID that is in one of the {@link #getIdProperties() identification properties}.
     * 
     * @return the UUID for this location, or null if there is no such identification property
     */
    public UUID getUuid() {
        Property property = getIdProperty(DnaLexicon.UUID);
        if (property != null && !property.isEmpty()) {
            Object value = property.getFirstValue();
            if (value instanceof UUID) return (UUID)value;
        }
        return null;
    }

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     * 
     * @return the UUID for this location, or null if there is no such identification property
     */
    @Override
    public UUID getUuid() {
        Property property = getIdProperty(DnaLexicon.UUID);
        if (property != null && !property.isEmpty()) {
            Object value = property.getFirstValue();
            if (value instanceof UUID) return (UUID)value;
        }
        return null;
    }

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     * @see Location#with(UUID)
     */
    @Override
    public Location with( UUID uuid ) {
        if (uuid == null) return this;
        Property newProperty = new BasicSingleValueProperty(DnaLexicon.UUID, uuid);
        if (this.hasIdProperties()) {
            Property existing = this.getIdProperty(DnaLexicon.UUID);
            if (existing != null && existing.equals(newProperty)) return this;
        }


        List<Property> newIdProperties = new ArrayList<Property>(idProperties.size() + 1);
        newIdProperties.addAll(idProperties);
        newIdProperties.add(newProperty);

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                }
            } else if (change instanceof UpdatePropertiesRequest) {
                UpdatePropertiesRequest update = (UpdatePropertiesRequest)change;
                for (Map.Entry<Name, Property> entry : update.properties().entrySet()) {
                    Name propName = entry.getKey();
                    Property property = entry.getValue();


                    if (property != null) {
                        if (update.isNewProperty(propName)) {
                            details.addProperty(property);
                        } else {

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    private final List<Property> properties;


    LocationWithUuid( UUID uuid ) {
        assert uuid != null;
        this.uuid = uuid;
        Property uuidProperty = new BasicSingleValueProperty(DnaLexicon.UUID, uuid);
        this.properties = Collections.singletonList(uuidProperty);
        this.hashCode = HashCode.compute(null, this.properties);
    }

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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(getPath(), newIdProperty);
        }
        return Location.create(getPath(), idProperty, newIdProperty);
    }

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