import com.sun.cldc.jna.SourceProcessor; //导入依赖的package包/类
/**
 * Preprocess a given set of Java import file source files.
 *
 * @param   dstDir     the directory containing the generated Java src files (typically "native")
 * @param   srcDirs    the set of directories that are searched recursively for the source files to be imported
 * @param   j2me       specifies if the classes being compiled are to be deployed on a J2ME platform
 * @return the preprocessor output directory
 */
public File processImports(
        File dstDir,
        File[] srcDirs,
        boolean j2me) {
    // Get the preprocessor output directory
    SourceProcessor sp = new SourceProcessor();


    for (int i = 0; i != srcDirs.length; ++i) {

        File sourceDir = srcDirs[i];

        // A selector that matches a source file whose preprocessed copy does not exist,
        // is younger than the source file or has a last modification date
        // earlier than the last modification date of the properties
        FileSet.Selector outOfDate = new FileSet.DependSelector(new FileSet.SourceDestDirMapper(sourceDir, dstDir)) {

            public boolean isSelected(
                    File file) {
                if (super.isSelected(file)) {
                    return true;
                }
                File preprocessedFile = getMapper().map(file);
                long fileLastModified = preprocessedFile.lastModified();
                return (fileLastModified < env.propertiesLastModified);
            }
        };

        FileSet.Selector selector = new FileSet.AndSelector(JAVA_SOURCE_SELECTOR, outOfDate);
        FileSet fs = new FileSet(sourceDir, selector);
        sp.execute(fs, dstDir);
    }
    return dstDir;
}