private String getJDepsExecutable()

in src/main/java/org/apache/maven/plugins/jdeps/AbstractJDepsMojo.java [439:505]
52 lines of code
15 McCabe index (conditional complexity)

    private String getJDepsExecutable() throws IOException
    {
        Toolchain tc = getToolchain();

        String jdepsExecutable = null;
        if ( tc != null )
        {
            jdepsExecutable = tc.findTool( "jdeps" );
        }

        String jdepsCommand = "jdeps" + ( SystemUtils.IS_OS_WINDOWS ? ".exe" : "" );

        File jdepsExe;

        if ( StringUtils.isNotEmpty( jdepsExecutable ) )
        {
            jdepsExe = new File( jdepsExecutable );

            if ( jdepsExe.isDirectory() )
            {
                jdepsExe = new File( jdepsExe, jdepsCommand );
            }

            if ( SystemUtils.IS_OS_WINDOWS && jdepsExe.getName().indexOf( '.' ) < 0 )
            {
                jdepsExe = new File( jdepsExe.getPath() + ".exe" );
            }

            if ( !jdepsExe.isFile() )
            {
                throw new IOException( "The jdeps executable '" + jdepsExe
                    + "' doesn't exist or is not a file." );
            }
            return jdepsExe.getAbsolutePath();
        }

        jdepsExe = new File( SystemUtils.getJavaHome() + File.separator + ".." + File.separator + "sh", jdepsCommand );

        // ----------------------------------------------------------------------
        // Try to find jdepsExe from JAVA_HOME environment variable
        // ----------------------------------------------------------------------
        if ( !jdepsExe.exists() || !jdepsExe.isFile() )
        {
            Properties env = CommandLineUtils.getSystemEnvVars();
            String javaHome = env.getProperty( "JAVA_HOME" );
            if ( StringUtils.isEmpty( javaHome ) )
            {
                throw new IOException( "The environment variable JAVA_HOME is not correctly set." );
            }
            if ( ( !new File( javaHome ).getCanonicalFile().exists() )
                || ( new File( javaHome ).getCanonicalFile().isFile() ) )
            {
                throw new IOException( "The environment variable JAVA_HOME=" + javaHome
                    + " doesn't exist or is not a valid directory." );
            }

            jdepsExe = new File( javaHome + File.separator + "bin", jdepsCommand );
        }

        if ( !jdepsExe.getCanonicalFile().exists() || !jdepsExe.getCanonicalFile().isFile() )
        {
            throw new IOException( "The jdeps executable '" + jdepsExe
                + "' doesn't exist or is not a file. Verify the JAVA_HOME environment variable." );
        }

        return jdepsExe.getAbsolutePath();
    }