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Added a new Examples folder with modified Examples/java files

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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/branches/gsoc2008-cherylfoil@10763 626c5289-ae23-0410-ae9c-e8d60b6d4f22
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Cheryl Foil 2008-08-15 23:54:53 +00:00
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18
Examples/doxygencomments/java/constants/Makefile Normal file
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TOP = ../..
SWIG = $(TOP)/../preinst-swig
CXXSRCS =
TARGET = example
INTERFACE = example.i
SWIGOPT =
all:: java
java::
$(MAKE) -f $(TOP)/Makefile CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' java_cpp
javac *.java
clean::
$(MAKE) -f $(TOP)/Makefile java_clean
check: all

30
Examples/doxygencomments/java/constants/example.i Normal file
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/*! File : example.i */
%module example
/* Force the generated Java code to use the C constant values rather than making a JNI call */
%javaconst(1);
/*! A few preprocessor macros */
#define ICONST 42
#define FCONST 2.1828
#define CCONST 'x'
#define CCONST2 '\n'
#define SCONST "Hello World"
#define SCONST2 "\"Hello World\""
/*! This should work just fine */
#define EXPR ICONST + 3*(FCONST)
/*! This shouldn't do anything */
#define EXTERN extern
/*! Neither should this (BAR isn't defined) */
#define FOO (ICONST + BAR)
/*! The following directives also produce constants */
%constant int iconst = 37;
%constant double fconst = 3.14;

52
Examples/doxygencomments/java/constants/index.html Normal file
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<html>
<head>
<title>SWIG:Examples:java:constants</title>
</head>
<body bgcolor="#ffffff">
<tt>SWIG/Examples/java/constants/</tt>
<hr>
<H2>Wrapping C Constants</H2>
<p>
When SWIG encounters C preprocessor macros and C declarations that look like constants,
it creates Java constant with an identical value. Click <a href="example.i">here</a>
to see a SWIG interface with some constant declarations in it.
<h2>Accessing Constants from Java</h2>
Click <a href="../../../Doc/Manual/Java.html#constants">here</a> for the section on constants in the SWIG and Java documentation.
<p>
Click <a href="main.java">here</a> to see a Java program that prints out the values
of the constants contained in the above file.</p>
<h2>Key points</h2>
<ul>
<li>The values of preprocessor macros are converted into Java constants.
<li>Types are inferred by syntax (e.g., "3" is an integer and "3.5" is a float).
<li>Character constants such as 'x' are converted into Java strings.
<li>C string literals such as "Hello World" are converted into Java strings.
<li>Macros that are not fully defined are simply ignored. For example:
<blockquote>
<pre>
#define EXTERN extern
</pre>
</blockquote>
is ignored because SWIG has no idea what type of variable this would be.
<p>
<li>Expressions are allowed provided that all of their components are defined. Otherwise, the constant is ignored.
<li>Certain C declarations involving 'const' are also turned into Java constants.
<li>The constants that appear in a SWIG interface file do not have to appear in any sort
of matching C source file since the creation of a constant does not require linkage
to a stored value (i.e., a value held in a C global variable or memory location).
</ul>
<hr>
</body>
</html>

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Examples/doxygencomments/java/constants/main.java Normal file
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import java.lang.reflect.*;
public class main {
static {
try {
System.loadLibrary("example");
} catch (UnsatisfiedLinkError e) {
System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
System.exit(1);
}
}
public static void main(String argv[])
{
System.out.println("ICONST = " + example.ICONST + " (should be 42)");
System.out.println("FCONST = " + example.FCONST + " (should be 2.1828)");
System.out.println("CCONST = " + example.CCONST + " (should be 'x')");
System.out.println("CCONST2 = " + example.CCONST2 + " (this should be on a new line)");
System.out.println("SCONST = " + example.SCONST + " (should be 'Hello World')");
System.out.println("SCONST2 = " + example.SCONST2 + " (should be '\"Hello World\"')");
System.out.println("EXPR = " + example.EXPR + " (should be 48.5484)");
System.out.println("iconst = " + example.iconst + " (should be 37)");
System.out.println("fconst = " + example.fconst + " (should be 3.14)");
// Use reflection to check if these variables are defined:
try
{
System.out.println("EXTERN = " + example.class.getField("EXTERN") + " (Arg! This shouldn't print anything)");
}
catch (NoSuchFieldException e)
{
System.out.println("EXTERN isn't defined (good)");
}
try
{
System.out.println("FOO = " + example.class.getField("FOO") + " (Arg! This shouldn't print anything)");
}
catch (NoSuchFieldException e)
{
System.out.println("FOO isn't defined (good)");
}
}
}