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In the argument list, notice that find_words defines a function parameter, which captures our intent to pass to xref the function to use to split the input into words The other interesting thing is that we say = split after the definition of find_words, which indicates that this parameter has a default argument When we give a parameter a default argument, we're saying that callers can omit that argument if they wish If they supply an argument, the function will use it If they omit the argument, the compiler will substitute the default Thus, users can call this function in either of two ways:

source (see Section 29, Book Samples on page 105) Gauthier, Laurent, Building and Delivering a Table Editor with SWT/JFace, Mirasol Op nWorks, July 3, 2003 (wwweclipseorg/articles/Article-Tableviewer/table_viewerhtml) Grindstaff, Chris, How to Use the JFace Tree Viewer, Applied Reasoning, May 5, 2002 (wwweclipseorg/articles/treeviewer-cg/TreeViewerArticlehtm)

xref(cin); xref(cin, find_urls); // uses split to find words in the input stream // uses the function named find_urls to find words

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Commands and actions are two different APIs for accomplishing the same thing: declaring and implementing functions that manifest as menu items and toolbar buttons The action API has been around since before Eclipse 30, while the commands API has only just solidified as of Eclipse 33 with small refinements in Eclipse 34 It appears that at some point the actions API will be deprecated, moved into a compatibility layer and in the future removed, but much of the Eclipse tooling still makes extensive use of the actions API, not to mention third party tools and IDEs built on top of the Eclipse infrastructure Like everything else in Eclipse, commands and actions are defined through various extension points so that new functionality can be easily added at various points throughout the Eclipse framework With actions, there are different extension points for each different area where one can appear within the UI, yet no separation of presentation from implementation In contrast, the commands API separates presentation from implementation by providing one extension point for specifying the command, another for specifying where it should appear in the UI, and a third for specifying the implementation This, along with a richer declarative expression syntax, makes the commands API more flexible than the actions API The first half of this chapter discusses implementing our Favorites plug-in using the commands API while the second half has the same goal using the actions API (see Section 65, IAction versus IActionDelegate, on page 240) If you implement everything in the first half of the chapter using the commands API and everything in the second half of the chapter using the actions API, then the resulting Favorites plug-in will have duplicate menu and toolbar items

Declaring and implementing a menu or toolbar item using the command API involves declaring a command, at least one menu contribution for that command, and at least one handler for that command (see Figure 6 1) The command declaration is the abstract binding point associating one or more menu contributions with one or more handlers (see Figure 6 2)

The function body starts by defining a string variable, named line, which will hold each line of input as we read it, and an int variable, named line_number, to hold the line number of the line that we are currently processing The input loop calls getline ( 57/91) to read a line at a time into line As long as there is input, we increment the line counter and then process each word in the line We begin that processing by declaring a local variable named words, which will hold all the words from line, and initialize it by calling find_words That function will be either our split function ( 611/103), which splits line into its component words, or another function that takes a string argument and returns a vector<string> result We continue with a for statement that visits each element in words, updating the map each time through words The for header should be familiar: It defines an iterator, and marches that iterator sequentially through words The statement that forms the body of the for may be hard to understand on first reading,

The first step is to declare the command itself (see Section 611, Defining a command, on page 216) which represents the concept of a UI function, such as Paste , without defining where that function should appear in the user interface or what happens when the user selects that function A menu contribution declaration (see Section 62, Menu and Toolbar Contributions, on page 220) defines where in the user interface that command should appear, and the text and image associated with that representation A handler declaration (see Section 63, Handlers, on page 236) associates a command with a concrete class implementing the behavior for that command

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