Variable in Java

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Table 12-3 Variable
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name length maxLength readable writable
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Variables of the Resource Class Type
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String Long Long Boolean Boolean
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Access
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R R R R R
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Description
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The name of the resource The current size of the content associated with this resource The maximum content size for this resource Whether the resource can be read Whether the resource can be written
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Local Storage
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The following code, which you can find in the file platformapi/LocalStorage5fx, illustrates the use of these variables:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 package platformapi; import javafxioStorage; var s = Storage { source: "Hello"; } var r = sresource; println("Name: {rname}"); println("Length: {rlength}"); println("MaxLength: {rmaxLength}"); println("Readable: {rreadable}"); println("Writable: {rwritable}");
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The Storage and Resource objects in this code refer to the resource that was created in our earlier examples Here is the output from this code:
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Name: Hello Length: 0 MaxLength: 8192 Readable: true Writable: true
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The name variable is the name of the resource as supplied to the source variable of the Storage object, except that when an absolute path is used, the name variable will contain only the last component of the full resource pathThe length variable reflects the space currently occupied by the resource, while maxLength is the maximum permissible allocation for this resourceThe readable and writable variables indicate whether the resource can be read or written to, respectively It is not clear under what circumstances a resource might not be readable or writable and, at the time of this writing, these variables seem to always have the value true Note
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In the previous output, the length variable has the value 0 This is a bug, which has been reported and should be fixed in a future version of the JavaFX platform
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Removing Data
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You can remove either a single resource or all resources within the area to which your application has accessTo remove a specific resource, use the clear() function of its Storage object; to remove all resources in the application s private storage area, use the clearAll() script function of the Storage class, as shown in the following code:
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1 2 3 package platformapi; import javafxioStorage;
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12 Platform APIs
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4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
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// Create two resource var s = Storage { source: "Hello" } Storage { source: "Goodbye" } println("------------- RESOURCES BEFORE ---------------"); for (name in Storagelist()) { println("Resource: {name}"); } println("----------- END RESOURCES BEFORE -------------"); // Remove the first resource sclear(); println("------------- RESOURCES AFTER ---------------"); for (name in Storagelist()) { println("Resource: {name}"); } println("----------- END RESOURCES AFTER -------------"); // Remove the remaining resource StorageclearAll(); println("------------- RESOURCES AT END ---------------"); for (name in Storagelist()) { println("Resource: {name}"); println("----------- END RESOURCES AT END -------------");
Lines 6 to 11 create two resources called Hello and Goodbye in the application s private area Note that the resource is created even if no content is written Lines 13 to 16 list the resources that exist, to demonstrate that they have been created:
------------- RESOURCES BEFORE --------------Resource: Goodbye Resource: Hello ----------- END RESOURCES BEFORE -------------
Hello
On line 20, we call the clear() function of the Storage object that refers to the resource, which removes it, and then lists the resources again:
------------- RESOURCES AFTER --------------Resource: Goodbye ----------- END RESOURCES AFTER -------------
Local Storage
Finally, on line 29, we use the clearAll() function to remove the remaining resource, with the following result:
------------- RESOURCES AT END ------------------------- END RESOURCES AT END -------------
Resource Names and Access Control
So far, we have only used relative resource names like Hello and Goodbye, without saying what these names are relative toThe namespace used for resources is not a real one, so you won t actually find a file called Hello in the file system when you create a resource of that name Instead, the JavaFX runtime creates a file in a private area that will contain the actual data for the resource and maintains a mapping from the logical name of a resource to that file Resource Names The full name of a resource is based on the codebase of the JavaFX application that creates itThe codebase is the value of the javafxapplicationcodebase property and reflects the location from which the code was loaded For a Java Web Start application, the codebase is obtained from the <jnlp> element of the JNLP file and refers to the directory on the web server that contains the JNLP file and, usually, the JAR files for the application For a JavaFX applet, the codebase is typically specified in the <applet> tag and, again, it refers to the directory that contains the JAR files for the applet For example, suppose that your company has three JavaFX applications, two belonging to the accounts department and one to human resources Each application has its own JNLP file, and the JNLP files (and the JAR files, which we don t show here) are held in a directory structure that represents the company s internal organization, like this:
http://myorgcom/accounts/AccountsApp1jnlp http://myorgcom/accounts/AccountsApp2jnlp http://myorgcom/hr/HRApp1jnlp