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<H2><A NAME="SECTION02423000000000000000"></A><A NAME="1913"></A><A NAME="1914"></A><A NAME="1915"></A>
<BR>
Packages and Versions
</H2>
<P>
SIDL has both a packaging and versioning mechanism built in.
Packages are essentially named scopes, serving a similar function
as Java packages or C++ namespaces. Versions
are decimal separated integer values where it is assumed
larger numbers imply more recent versions. All classes
and interfaces in that package get that same
version number. If subpackages are specified, they can have their own version
number assigned. If a package is declared without a version, it can only
contain other packages. If a package declares interfaces or classes,
a version number for that package is required.
<P>
<BR>
<PRE CLASS="verbatim">package mypkg {
}
</I></PRE></td></tr></table></blockquote>This SIDL file represents the minimum needed for each and every SIDL
file. The package statement defines a scope where all
classes within the package must reside. Since no version clause is included,
the version number defaults to 0.
<P>
Packages can be nested.<A NAME="1917"></A> This is shown in the example below. The version
numbers assigned to all the types is determined by the package, or subpackage,
in which it resides. In the design of the SIDL file, remember that
some languages get very long function names from excessively nested packages
or excessively long package names.
<BR>
<PRE CLASS="verbatim">package mypkg version 1.0 {
package thisIsAReallyLongPackageName {
}
package this version 0.6 {
package is {
package a {
package really {
package deeply version 0.4 {
package nested {
package packageName version 0.1 {
}
}
}
}
}
}
}
}
</I></PRE></td></tr></table></blockquote>
<P>
External types can be expressed in one of two ways. The fully
scoped<A NAME="1919"></A>
external type can be used anywhere in the class description. Alternatively,
an <TT><I CLASS="slanted">import</I></TT><A NAME="1921"></A><A NAME="1922"></A> statement can be used to put the type in the local
package-space. <TT><I CLASS="slanted">import</I></TT> statements can request a specific
version of the package, if that version is not found, Babel will print
an error. If no version is specified, Babel will take whatever
version it is being run on. Babel can not be run on two versions of
a given package at the same time, even if you only import or require
one of them.
<P>
Another way to restrict the package version you use is the <TT><I CLASS="slanted">restrict</I></TT><A NAME="1925"></A><A NAME="1926"></A> statement.
<TT><I CLASS="slanted">restrict</I></TT> does not import the package, but if you do later
import the package or refer to something in that package by it's fully
scoped name, Babel will guarantee that the correct version of the
package will be used. Also note that all restrict statements must come before
the first import statement.
<P>
Below is a sample SIDL file, that should help bring all of these concepts
together.
<P>
<BR>
<PRE CLASS="verbatim">require pkgC version 2.0; // restrict pkgC to version 2.0, not imported
import pkgA version 1.0; // restrict pkgA version 1.0. Includes class pkgA.A
import pkgB; // import pkgB regaurdless of version. Includes class pkgB.B
package mypkg version 2.0 {
class foo {
setA( A ); // imported from pkgA, must be pkgA.A-v1.0
setB( B ); // imported from pkgB, must be pkgB.B, no version restriction
setC( pkgC.C ); // must be pkgC.C-v2.0
setD( pkgD.D ); // no version restriction
}
}
</I></PRE></td></tr></table></blockquote>
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