Complex nesting in Java

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Complex nesting
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After you understand the general concept of nesting structures, you can delve a little deeper into more complex nesting schemes, where one complex variable is nested within another. You can, for example, also nest arrays inside of structures, as follows:
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<cfset <cfset <cfset <cfset myStruct[ FruitArray ] myStruct.FruitArray[1] myStruct.FruitArray[2] myStruct.FruitArray[3] = = = = ArrayNew(1)> orange > lemon > pineapple >
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After you add the array, myStruct looks like what s shown in Figure 15-6.
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Part III The ColdFusion MX Language
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Figure 15-6: An array nested inside myStruct.
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Structures can be nested any number of levels deep. In addition, array elements can contain structures, as the following example shows:
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<cfset myArray = ArrayNew(1)> <cfset myArray[1] = StructNew()> <cfset myArray[1][ MyTestKey ] = my value > <cfoutput> #myArray[1].MyTestKey# </cfoutput>
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Structures become truly useful if you use them as containers for complex data that models the real world. You can create a shopping cart by using a structure, for example, as shown in Listing 15-1.
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Listing 15-1: Creating a shopping cart in a structure
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<cfset <cfset <cfset <cfset <cfset <cfset <cfset <cfset <cfset <cfset <cfset <cfset <cfset myCart = StructNew()> myCart.cartID = CreateUUID()> myCart.saleDate = Now()> myCart.arItemNumber = ArrayNew(1)> myCart.arItemName = ArrayNew(1)> myCart.arQuantity = ArrayNew(1)> myCart.arUnitPrice = ArrayNew(1)> myCart.arExtended = ArrayNew(1)> myCart.subtotal = 0> myCart.salesTaxRate = 4.0000> myCart.salesTaxAmount = 0> myCart.shippingAmount = 0> myCart.total = 0>
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15 Working with Structures
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Later on, after your shopping cart contains line items in its arrays, you can easily produce familiar values, as the following list describes: The subtotal is simply ArraySum(myCart.arExtended),. The sales-tax amount is simply (myCart.salesTaxRate * myCart.subtotal). The total is (myCart.subtotal + myCart.salesTaxAmount + myCart.shippingAmount). You face no limits on how much information that your structure can store, nor do you have any limits as to how complex it can be. The only thing that you must watch out for is making your structure too complicated for your needs. You can usually keep track of what goes where quite easily if you make the format of your structures emulate the real-world data that you are storing.
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How dot notation automatically creates a nested structure
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Until now, you ve created structures only by using StructNew(). You can also create structures just by using dot notation, as follows:
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<cfset aNewStruct.SomeKey.SomeValue = 1>
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That line creates a structure named aNewStruct with a substructure named SomeKey that has an element named SomeValue with a value of 1. You can visualize it as what s shown in Figure 15-7. Figure 15-7: A structure created by using dot notation.
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Notice that, in the figure, the names of all newly created structures and keys are all uppercase, regardless of the capitalization that you use in the code. As convenient as this method may seem, it does have a drawback. Consider the following snippet:
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<cfset aNewStruct = StructNew()> <cfset aNewStruct.myKey = 2> <cfset aNewStruct.yourKey = 3>
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After running the preceding snippet, two new keys, named myKey and yourKey, are created, and aNewStruct looks as shown in Figure 15-8. Figure 15-8: aNewStruct.
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Part III The ColdFusion MX Language
Suppose that you now attempt to call the following snippet to create a nested structure named myKey:
<cfset aNewStruct.myKey.subKey = 4>
If the previous line had worked, it would have overwritten the previous simple value of myKey with a substructure named myKey, and aNewStruct would look as shown in Figure 15-9. Figure 15-9: aNewStruct with a nested substructure.
Fortunately, however, attempting to overwrite a simple key with a substructure throws an error in ColdFusion MX.
Caution You do face a limitation in creating structure keys by using this method. ColdFusion MX can create nested structures only up to three levels deep in a single call, as in this example: <cfset a = StructNew()> <cfset a.b.c.d = some value > Attempting to create a key more than three levels deep gives you unexpected results. ColdFusion ignores all but the last three keys. Running the following code, for example, outputs some value : <cfset a = StructNew()> <cfset a.b.c.d.e.f.g = some value > <cfoutput> #a.e.f.g# </cfoutput> You can, however, create structures nested as deeply as you want as long as you don t attempt to go more than three levels deeper than currently exists.