public boolean applyIncrementalBuild()

in src/main/java/org/apache/maven/plugin/compiler/ToolExecutor.java [301:356]
55 lines of code
16 McCabe index (conditional complexity)

    public boolean applyIncrementalBuild(final AbstractCompilerMojo mojo, final Options configuration)
            throws IOException {
        final boolean checkSources = incrementalBuildConfig.contains(IncrementalBuild.Aspect.SOURCES);
        final boolean checkClasses = incrementalBuildConfig.contains(IncrementalBuild.Aspect.CLASSES);
        final boolean checkDepends = incrementalBuildConfig.contains(IncrementalBuild.Aspect.DEPENDENCIES);
        final boolean checkOptions = incrementalBuildConfig.contains(IncrementalBuild.Aspect.OPTIONS);
        if (checkSources | checkClasses | checkDepends | checkOptions) {
            incrementalBuild =
                    new IncrementalBuild(mojo, sourceFiles, checkSources, configuration, incrementalBuildConfig);
            String causeOfRebuild = null;
            if (checkSources) {
                // Should be first, because this method deletes output files of removed sources.
                causeOfRebuild = incrementalBuild.inputFileTreeChanges();
            }
            if (checkClasses && causeOfRebuild == null) {
                causeOfRebuild = incrementalBuild.markNewOrModifiedSources();
            }
            if (checkDepends && causeOfRebuild == null) {
                List<String> fileExtensions = mojo.fileExtensions;
                if (fileExtensions == null || fileExtensions.isEmpty()) {
                    fileExtensions = List.of("class", "jar");
                }
                causeOfRebuild = incrementalBuild.dependencyChanges(dependencies.values(), fileExtensions);
            }
            if (checkOptions && causeOfRebuild == null) {
                causeOfRebuild = incrementalBuild.optionChanges();
            }
            if (causeOfRebuild != null) {
                if (!sourceFiles.isEmpty()) { // Avoid misleading message such as "all sources changed".
                    logger.info(causeOfRebuild);
                }
            } else {
                isPartialBuild = true;
                sourceFiles = incrementalBuild.getModifiedSources();
                if (IncrementalBuild.isEmptyOrIgnorable(sourceFiles)) {
                    incrementalBuildConfig.clear(); // Prevent this method to be executed twice.
                    logger.info("Nothing to compile - all classes are up to date.");
                    sourceFiles = List.of();
                    return false;
                } else {
                    int n = sourceFiles.size();
                    var sb = new StringBuilder("Compiling ").append(n).append(" modified source file");
                    if (n > 1) {
                        sb.append('s'); // Make plural.
                    }
                    logger.info(sb.append('.'));
                }
            }
            if (!(checkSources | checkDepends | checkOptions)) {
                incrementalBuild.deleteCache();
                incrementalBuild = null;
            }
        }
        incrementalBuildConfig.clear(); // Prevent this method to be executed twice.
        return true;
    }