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This behavior can be overridden by custom code It s possible, for example, to call a different serializer in cases where the version number does not match, thus providing for automatic migration for models created using older versions of the domain model The de nition of a DSL can change for reasons other than deploying new versions While the language is being developed, test and example models will be created in the debugging solution that is automatically created by the DSL Tools, and unless it is explicitly changed, all of these models will have the same version number It would be frustrating if these models were invalidated for every change to the DSL de nition Fortunately, the le-reading code generated for a DSL is relatively forgiving and will do a good job of reading in models, even if the DSL de nition has changed, and will issue warnings that indicate the steps it has taken The le reader will take the following approaches when confronted with an incorrect le: Within the scope of a given domain class, elements (properties and relationships) may appear in any order Elements de ned in base classes must appear before elements from derived classes, though Unexpected elements will be ignored, together with everything nested in them Unexpected attributes will be ignored Missing attributes and elements will cause the model to be populated using default values When such a le is encountered, warnings may be given to the user, because the le will fail its schema validation Schemas are discussed in the next section of this chapter If, while reading in a model, monikers are encountered that cannot be resolved, le loading will fail This is likely to happen when the DSL author changes the cross-referencing scheme for one or more relationships for example, changing the key for a domain class from an Id to a name In these cases, the model reader will open the le in the XML editor and will display errors in the error window that show which monikers have failed to resolve and on which lines of the le the corresponding cross-references appear It such cases it is often easiest to edit the XML directly to change the moniker.

expandToLevel(int)

We next generate our scenario diagram plug-in and move on to making some of the necessary code changes or you can run the diagram now to see how it looks

expandToLevel(Object, int)

elements into the form that will successfully load An example is illustrated in Figure 6-7, where the XML le has been edited so that line 12 contains the reference "StateModel/Opened" for which there is no corresponding element Double-clicking on the error message takes the user directly to the offending element In such a situation, the diagram le may also fail to load because its references into the model cannot be resolved

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Our border item Event nodes are offset by default so that the edge of the node meets the edge of the parent For our Event nodes, we want them to straddle the border, so we must modify the addFixedChild() method of the parent TaskEditPart class to set the offset to half the diameter of the Event circle figure The modified method follows, showing the general EventXEditPart modification, where X is replaced by the number of each side-affixed event A better solution would be to use childEditPartgetSize()width/2 to calculate the offset Changes appear in bold

element so that the given element becomes visible in this viewer's tree control, and then expands the subtree rooted at the given element to the given level

getExpandedElements()

/** * Modified to add border offset for overlapping event nodes * * @generated NOT */ protected boolean addFixedChild(EditPart childEditPart) { if (childEditPart instanceof TaskNameEditPart) {

- Returns a list of elements correspond-

To recover from a situation where the diagram fails to load, the user may edit the moniker elements in the diagram le into a form that will resolve; alternatively, it may be simpler to delete the diagram le, because a new one will be automatically created by opening and saving

ing to expanded nodes in this viewer's tree, including currently hidden ones that are marked as expanded but are under a collapsed ancestor

((TaskNameEditPart) childEditPart)setLabel(getPrimaryShape() getFigureRoundedRectangleNameLabel()); return true; } if (childEditPart instanceof EventXEditPart) { BorderItemLocator locator = new BorderItemLocator(getMainFigure(), PositionConstantsNONE); locatorsetBorderItemOffset(new Dimension(getMapMode()DPtoLP(10), getMapMode()DPtoLP(10))); getBorderedFigure()getBorderItemContainer()add( ((Event2EditPart) childEditPart)getFigure(), locator); return true; } return false; }

getExpandedState(Object)

Figure 4-35

- Returns whether the node corre-

the model le, and the only thing that will have been lost is the diagram layout There is a tradeoff here between the effort needed to x up the references by hand in the XML versus the effort needed to lay out the diagram

Tree getTree()

Our graphical definition model has no double line option, so we need to write some custom code to create a double outline for our intermediate event We can do this in several ways, including nesting figures It seems easiest to simply override the outlineShape() method in our generated Ellipse figure Following is the modification made to accomplish this, though it won t work if we have a line width other than 1 Fortunately, we know that we won t, because otherwise we d take the time to put the additional logic in the templates and provide a decorator model for our graphical definition model The following code is found in the generated Event2EditPart class After generating the figures plug-in in Section 455, Generating the Figures Plug-In, you can find the code to modify in orgeclipsebpmnfiguresDoubleCircle and associated DoubleCircleWithEnvelope

getVisibleExpandedElements()

/** * Modified to draw double outline, assuming lineWidth == 1 * * @generated NOT */

isExpandable(Object)

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