Fix sevntu violations

* remove Guava Files class
* allow MoreObjects again. It's not useful to enforce removing the
toString() helper class and to reimplement all toString() methods, as
that could lead to functional changes.

config/checkstyle_sevntu_checks.xml

@@ -48,7 +48,7 @@
                      java.util.Vector, java.util.Stack,com.google.collect.Iterables,
                      com.google.common.primitives.Ints,com.google.common.base.String,
                      com.google.common.base.Function,com.google.common.base.Supplier,
-                     com.google.common.base.Charsets,com.google.common.base.MoreObjects,
+                     com.google.common.base.Charsets,
                      com.google.common.base.Optional,com.google.common.base.Equivalence,
                      com.google.common.base.Preconditions,com.google.common.base.Predicate,
                      com.google.common.io.CharSource,com.google.common.annotations.Beta,

net.sf.eclipsecs.core/src/net/sf/eclipsecs/core/config/CheckConfigurationWorkingCopy.java

@@ -25,6 +25,7 @@
 import java.io.IOException;
 import java.net.URISyntaxException;
 import java.net.URL;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -42,7 +43,6 @@
 import org.xml.sax.InputSource;
 
 import com.google.common.io.Closeables;
-import com.google.common.io.Files;
 
 import net.sf.eclipsecs.core.CheckstylePlugin;
 import net.sf.eclipsecs.core.Messages;
@@ -264,7 +264,7 @@ public void setModules(List<Module> modules) throws CheckstylePluginException {
 
       // all went ok, write to the file
       File configFile = URIUtil.toFile(getResolvedConfigurationFileURL().toURI());
-      Files.write(byteOut.toByteArray(), configFile);
+      Files.write(configFile.toPath(), byteOut.toByteArray());
 
       // refresh the files if within the workspace
       // Bug 1251194 - Resource out of sync after performing changes to

net.sf.eclipsecs.core/src/net/sf/eclipsecs/core/config/GlobalCheckConfigurationWorkingSet.java

@@ -22,6 +22,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashSet;
@@ -35,8 +36,6 @@
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.runtime.IPath;
 
-import com.google.common.io.Files;
-
 import net.sf.eclipsecs.core.CheckstylePlugin;
 import net.sf.eclipsecs.core.Messages;
 import net.sf.eclipsecs.core.config.configtypes.BuiltInConfigurationType;
@@ -289,7 +288,7 @@ private void storeToPersistence() throws CheckstylePluginException {
       // write to the file after the document creation was successful
       // prevents corrupted files in case of error
       byte[] data = XMLUtil.toByteArray(doc);
-      Files.write(data, configFile);
+      Files.write(configFile.toPath(), data);
     } catch (IOException ex) {
       CheckstylePluginException.rethrow(ex, Messages.errorWritingConfigFile);
     }

net.sf.eclipsecs.core/src/net/sf/eclipsecs/core/config/configtypes/RemoteConfigurationType.java

@@ -30,6 +30,7 @@
 import java.net.URL;
 import java.net.URLConnection;
 import java.net.UnknownHostException;
+import java.nio.file.Files;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.Base64;
@@ -44,7 +45,6 @@
 import org.eclipse.osgi.util.NLS;
 
 import com.google.common.io.ByteStreams;
-import com.google.common.io.Files;
 import com.puppycrawl.tools.checkstyle.PropertyResolver;
 
 import net.sf.eclipsecs.core.CheckstylePlugin;
@@ -266,7 +266,7 @@ private void writeToCacheFile(ICheckConfiguration checkConfig, byte[] configFile
     File cacheFile = cacheFilePath.toFile();
 
     try {
-      Files.write(configFileBytes, cacheFile);
+      Files.write(cacheFile.toPath(), configFileBytes);
     } catch (IOException ex) {
       CheckstyleLog.log(ex, NLS.bind(Messages.RemoteConfigurationType_msgRemoteCachingFailed,
               checkConfig.getName(), checkConfig.getLocation()));
@@ -282,7 +282,7 @@ private void writeToCacheFile(ICheckConfiguration checkConfig, byte[] configFile
       File propsCacheFile = propsCacheFilePath.toFile();
 
       try {
-        Files.write(bundleBytes, propsCacheFile);
+        Files.write(propsCacheFile.toPath(), bundleBytes);
       } catch (IOException ex) {
         // ignore this since there simply might be no properties file
       }