@observe('collection.*')
 _collectionChanged(collection: any) {
     TemplateUtil.render({
         value: collection.base,
         scope: 'hydra-collection'
     }, this.$.table);
 }

 @observe('resource')
 _getEntrypoint(resource: IHydraResource) {
     resource.apiDocumentation.getEntrypoint()
         .then((entrypoint: IHydraResponse) => {
             this._setEntrypoint(entrypoint.root);
         })
         .catch(() => {
             this._setEntrypoint({});
         });
 }

    @observe('resource', 'propertyId')
    getTitle(resource: IHydraResource, propertyId: string) {
        if (resource && resource.apiDocumentation) {
            let properties = resource.types.map((t: IClass) => resource.apiDocumentation.getProperties(t));

            const supportedProps = Utils.flatten(properties);
            const [ supportedProp, ...tail ] = supportedProps.filter((prop: ISupportedProperty) => prop.property.id === propertyId);

            if (supportedProp) {
                this._setSupportedProperty(supportedProp);
                return;
            }
        }

        this._setSupportedProperty(propertyId);
    }

 @observe('supportedOperations')
 clearSelection() {
     this.$.selectedOperation = null;
     this.$.supportedOperations.value = '';
 }

 @observe('hasOperations')
 updateFabStyle(hasOperations: boolean) {
     this.updateStyles();
 }

 @observe('supportedOperation.returns')
 returnsObserver(returns:IClass) {
     this._setHasReturns(!!returns && returns.id !== nothing);
     setTitle.call(this, returns, this._setReturnsTitle);
 }

 @observe('supportedOperation.expects')
 expectsObserver(expects:IClass) {
     this._setHasExpects(!!expects && expects.id !== nothing);
     setTitle.call(this, expects, this._setExpectsTitle);
 }

 @observe('supportedClass')
 getProperties(supportedClass:IClass) {
     this.$.supportedProperties.value = null;
     this.$.classTabs.selected = 0;
 }

 @observe('resource')
 _onResourceChanged(resource: IHydraResource) {
     this._setDisplayedResources([ resource ]);
 }