91             } catch (IOException ioe) {
  92                 declarations = new ArrayList<>();
  93                 assert false; ioe.getMessage();
  94 
  95             } finally {
  96                 serializedDecls = null;
  97             }
  98 
  99         }
 100 
 101         return declarations;
 102     }
 103 
 104     private Observables observables = null;
 105 
 106     /**
 107      * This method is to support tooling that may want to add declarations to
 108      * or remove declarations from a Rule. Changes to the list are tracked
 109      * so that added declarations are tagged as belonging to this rule, and
 110      * the rule for removed declarations is nulled out.
 111      * If the list is not going to be modified, then it is more efficient to
 112      * call {@link #getUnobservedDeclarationList()}, but the returned list
 113      * must be treated as unmodifiable.
 114      * @return a observable list of declarations
 115      */
 116     public final ObservableList<Declaration> getDeclarations() {
 117 
 118         if (observables == null) {
 119             observables = new Observables(this);
 120         }
 121 
 122         return observables.getDeclarations();
 123     }
 124 
 125     /**
 126      * This method is to support tooling that may want to add selectors to
 127      * or remove selectors from a Rule. Changes to the list are tracked
 128      * so that added selectors are tagged as belonging to this rule, and
 129      * the rule for removed selectors is nulled out.
 130      * If the list is not going to be modified, then it is more efficient to
 131      * call {@link #getUnobservedSelectorList()}, but the returned list
 132      * must be treated as unmodifiable.
 133      * @return an observable list of selectors
 134      */
 135     public final ObservableList<Selector> getSelectors() {
 136 
 137         if (observables == null) {
 138             observables = new Observables(this);
 139         }
 140 
 141         return observables.getSelectors();
 142     }
 143 
 144     /** The stylesheet this selector belongs to */
 145     private Stylesheet stylesheet;
 146     public Stylesheet getStylesheet() {
 147         return stylesheet;
 148     }
 149 
 150     /* package */
 151     void setStylesheet(Stylesheet stylesheet) {
 152 

  91             } catch (IOException ioe) {
  92                 declarations = new ArrayList<>();
  93                 assert false; ioe.getMessage();
  94 
  95             } finally {
  96                 serializedDecls = null;
  97             }
  98 
  99         }
 100 
 101         return declarations;
 102     }
 103 
 104     private Observables observables = null;
 105 
 106     /**
 107      * This method is to support tooling that may want to add declarations to
 108      * or remove declarations from a Rule. Changes to the list are tracked
 109      * so that added declarations are tagged as belonging to this rule, and
 110      * the rule for removed declarations is nulled out.



 111      * @return a observable list of declarations
 112      */
 113     public final ObservableList<Declaration> getDeclarations() {
 114 
 115         if (observables == null) {
 116             observables = new Observables(this);
 117         }
 118 
 119         return observables.getDeclarations();
 120     }
 121 
 122     /**
 123      * This method is to support tooling that may want to add selectors to
 124      * or remove selectors from a Rule. Changes to the list are tracked
 125      * so that added selectors are tagged as belonging to this rule, and
 126      * the rule for removed selectors is nulled out.



 127      * @return an observable list of selectors
 128      */
 129     public final ObservableList<Selector> getSelectors() {
 130 
 131         if (observables == null) {
 132             observables = new Observables(this);
 133         }
 134 
 135         return observables.getSelectors();
 136     }
 137 
 138     /** The stylesheet this selector belongs to */
 139     private Stylesheet stylesheet;
 140     public Stylesheet getStylesheet() {
 141         return stylesheet;
 142     }
 143 
 144     /* package */
 145     void setStylesheet(Stylesheet stylesheet) {
 146