/**
* Checks to see if the list of outputFiles all exist, and have last-modified timestamps which are
* later than the last-modified timestamp of all the grammar files involved in build the output
* (imports must be checked). If these conditions hold, the method returns false, otherwise, it
* returns true.
*
* @param grammarFileName The grammar file we are checking
*/
public boolean buildRequired(String grammarFileName) throws IOException, ANTLRException {
BuildDependencyGenerator bd = new BuildDependencyGenerator(this, grammarFileName);
List<File> outputFiles = bd.getGeneratedFileList();
List<File> inputFiles = bd.getDependenciesFileList();
// Note that input directory must be set to use buildRequired
File grammarFile;
if (haveInputDir) {
grammarFile = new File(inputDirectory, grammarFileName);
} else {
grammarFile = new File(grammarFileName);
}
long grammarLastModified = grammarFile.lastModified();
for (File outputFile : outputFiles) {
if (!outputFile.exists() || grammarLastModified > outputFile.lastModified()) {
// One of the output files does not exist or is out of date, so we must build it
return true;
}
// Check all of the imported grammars and see if any of these are younger
// than any of the output files.
if (inputFiles != null) {
for (File inputFile : inputFiles) {
if (inputFile.lastModified() > outputFile.lastModified()) {
// One of the imported grammar files has been updated so we must build
return true;
}
}
}
}
if (isVerbose()) {
System.out.println("Grammar " + grammarFile + " is up to date - build skipped");
}
return false;
}
