[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: WORA help required
Peter Murray-Rust <peter@u...>: > I am having a number or problems turning JUMBO into a WORA-compliant animal > (WriteOnceReadAnywhere).... You might want to also ask these questions on advanced-java. There are a lot of good people on that list and your questions are interesting and applicable [the only ones "questionable" to the charter of the list have to do with applets, but your code is for both]. I will try to answer some of them here. All my answers will be 1.1 oriented since this is all I have been using recently. > A JDK1.02/JDK1.1.x > I have refrained from converting to 1.1. since I have been told that not > all browsers supported it. Is this still true? Or should I convert now? I think you will be "trapped" supporting 1.02 for a while if you want to support as many browsers as possible. For example, I still use Netscape 3.x because it is extremely stable. By my web logs that a lot of 3.x (and earlier) browsers still out there. Note that at the VM level there are very, very few changes between 1.0 and 1.1. The real problem is that the class libraries have migrated and if you migrate also you will not be backward compatible. > B.1 Is there a function I can call to tell whether I am in an applet or > application? Yes (maybe) but I don't remember what it is :-( It also somewhat depends what you want to know. You can find out about the overall environment with System.getProperties() [if you want to find out about the host VM which may indicate appletness] and you can find out about the ClassLoader and SecurityManager from their respective sources. I think the only object that really knows its an Applet is the Applet itself, so to propogate this knowledge outward requires either a web of associations to the Applet or some "static" information. The later can be very clean if you simply have a registry where you can put applet information (which obviously includes their existence). It sounds like you are doing something like that anyway. Again, I recall there existing another approach but don't remember. Someone on advanced-java would probably know. > B.2 I use ancillary files located in the *.class directories (e.g > icon.gif). A nice extension in JUMBO is a per-class schema.xml file, with > additional class information. Since CLASSPATH may contain many components, > how can I tell which component was used for the class I am now running, so > I can locate these files? Use Class#getResource(...). If you are in a particular object: URL url = this.getClass().getResource(relativePathName+fileName); The relativePathName should be from the current Class (in your case it would probably be empty). If you are in a static method you need to explicitly specify the class object: URL url = ThisClass.class.getResource... Because static methods are not connected to any object (they are completely resolved at compile time). > D java/jview > There are significant differences here, especially with filenames/URLs. No solutions, just a couple comments. The 100% Pure tester warns about all hardcoded '/' and '\', so these are obviously considered non-WORA. For most of these you can use either the functionality within a class (File concatenation) or the System.properties: * <dt>file.separator <dd>File separator ("/" on Unix) * <dt>user.home <dd>User home directory * <dt>user.dir <dd>User's current working directory * <dt>java.home <dd>Java installation directory URL's should generally work with standard URL notation (it is up to the implementation to work correctly). --Mark mark.fussell@c... xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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