remove dependency to Guava

pdb-plotting/build.gradle

@@ -3,6 +3,5 @@ dependencies {
 	compile project(':performanceDb')
 	compile lib_primitive_collections
 	compile lib_jackson_databind
-	compile lib_guava
 }
 

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/PlotSettings.java

@@ -8,8 +8,7 @@ import java.util.List;
 import java.util.regex.Pattern;
 
 import org.lucares.pdb.api.DateTimeRange;
-
-import com.google.common.base.Preconditions;
+import org.lucares.utils.Preconditions;
 
 public class PlotSettings {
 
@@ -120,7 +119,7 @@ public class PlotSettings {
 	public DateTimeRange dateRange() {
 
 		final String[] startEnd = dateRangeAsString.split(Pattern.quote(" - "));
-		Preconditions.checkArgument(startEnd.length == 2, "invalid date range");
+		Preconditions.checkEqual(startEnd, 2, "invalid date range: ''{0}''", dateRangeAsString);
 
 		final OffsetDateTime startDate = LocalDateTime.parse(startEnd[0], DATE_FORMAT).atOffset(ZoneOffset.UTC);
 		final OffsetDateTime endDate = LocalDateTime.parse(startEnd[1], DATE_FORMAT).atOffset(ZoneOffset.UTC);

pdb-plotting/src/main/java/org/lucares/recommind/logs/Gnuplot.java

@@ -7,6 +7,7 @@ import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.lang.ProcessBuilder.Redirect;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Collection;
 import java.util.concurrent.ExecutorService;
@@ -15,8 +16,6 @@ import java.util.concurrent.Executors;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.google.common.io.Files;
-
 public class Gnuplot {
 
 	private static final Logger LOGGER = LoggerFactory.getLogger(Gnuplot.class);
@@ -25,8 +24,9 @@ public class Gnuplot {
 	private static final String ENV_GNUPLOT_HOME = "GNUPLOT_HOME";
 	private static final String PROPERTY_GNUPLOT_HOME = "gnuplot.home";
 	private final Path tmpDirectory;
-	
-	// This would be bad style if this code was executed in a web-container, because it would cause a memory leak.
+
+	// This would be bad style if this code was executed in a web-container, because
+	// it would cause a memory leak.
 	// But this code is only (and will only) be executed as standalone application.
 	private static final ExecutorService POOL = Executors.newCachedThreadPool();
 
@@ -43,15 +43,15 @@ public class Gnuplot {
 		LOGGER.debug(gnuplotFileContent);
 
 		final File gnuplotFile = File.createTempFile("gnuplot", ".dem", tmpDirectory.toFile());
-		Files.asCharSink(gnuplotFile, StandardCharsets.UTF_8).write(gnuplotFileContent);
+		Files.writeString(gnuplotFile.toPath(), gnuplotFileContent, StandardCharsets.UTF_8);
 
 		final long start = System.nanoTime();
 
 		try {
 			final ProcessBuilder processBuilder = new ProcessBuilder(gnuplotBinary(), gnuplotFile.getAbsolutePath())//
-			.redirectOutput(Redirect.PIPE)//
-			.redirectError(Redirect.PIPE);
-			
+					.redirectOutput(Redirect.PIPE)//
+					.redirectError(Redirect.PIPE);
+
 			final Process process = processBuilder.start();
 			logOutput("stderr", process.getErrorStream());
 			logOutput("stdout", process.getInputStream());
@@ -69,18 +69,17 @@ public class Gnuplot {
 		METRICS_LOGGER.debug("gnuplot: {}ms", (System.nanoTime() - start) / 1_000_000.0);
 	}
 
-	private void logOutput(final String humanReadableType, final  InputStream stream) throws IOException {
-		
-		POOL.submit(()->{
-			try{
+	private void logOutput(final String humanReadableType, final InputStream stream) throws IOException {
+
+		POOL.submit(() -> {
+			try {
 				final BufferedReader reader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8));
 				String line;
-				while(( line = reader.readLine()) != null){
+				while ((line = reader.readLine()) != null) {
 					LOGGER.info("gnuplot {}: {}", humanReadableType, line);
 				}
-			}
-			catch (Exception e){
-				LOGGER.warn("Exception while reading "+ humanReadableType+ " of gnuplot command", e);
+			} catch (final Exception e) {
+				LOGGER.warn("Exception while reading " + humanReadableType + " of gnuplot command", e);
 			}
 		});
 	}