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Oracle Fusion Middleware Java API Reference for Oracle Extension SDK 11g Release 2 (11.1.2.2.0) E17493-03 |
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public interface NameGenerator
This is a callback interface used by the URLFactory
while it is in the process of producing a new unique URL
.
Method Summary | |
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java.lang.String |
nextName() This method is called by URLFactory from one of its newUniqueURL(...) methods to obtain a relative file name, which is usually just a simple file name without any preceeding directory names, that will be used in the process of generating a unique URL . |
Method Detail |
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java.lang.String nextName()
URLFactory
from one of its newUniqueURL(...)
methods to obtain a relative file name, which is usually just a simple file name without any preceeding directory names, that will be used in the process of generating a unique URL
.
The URLFactory
is responsible for assembling a complete URL
by combining a base URL
with the relative file name returned by nextName()
. The URLFactory
is also responsible for checking that the newly created URL
is unique among files on disk and within the IDE's caches. If the new URL
is not unique, then URLFactory
will issue another call to nextName()
to get a new name. This process is repeated until either a unique URL
is produced, or the URLFactory
"times out" on the NameGenerator
implementation after a very large number of iterations fails to produce a unique URL
.
Therefore to interact properly with URLFactory
, the nextName()
implementation must return a different name each time it is invoked. More specifically, a particular instance of NameGenerator
should not return any name more than once from its nextName()
method. Of course, this restriction does not apply across different instances of NameGenerator
.
The exact means by which a new name is produced is not specified and is left to the specific NameGenerator
classes. However, the nextName()
method should not attempt to create an URL
and check for its uniqueness, as this may lead to problems in the future when the URLFactory
and URLFileSystem
classes are enhanced. For example, if individual NameGenerator
implementations are attempting to determine uniqueness, bugs may surface later if the IDE's algorithm for determining uniqueness changes. How the IDE determines URL
uniqueness is not documented and should be considered an implementation detail of the IDE framework. For an example of a NameGenerator
implementation, see DefaultNameGenerator
.
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Oracle Fusion Middleware Java API Reference for Oracle Extension SDK 11g Release 2 (11.1.2.2.0) E17493-03 |
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