poartial fix for #46 - Sonarqube found problems in Checkstyle

src/checkstyle/com/puppycrawl/tools/checkstyle/CheckStyleTask.java

@@ -284,7 +284,7 @@ private void realExecute()
         log("compiled on " + compileTimestamp, Project.MSG_VERBOSE);
 
         // Check for no arguments
-        if ((mFileName == null) && (mFileSets.size() == 0)) {
+        if ((mFileName == null) && mFileSets.isEmpty()) {
             throw new BuildException(
                     "Must specify at least one of 'file' or nested 'fileset'.",
                     getLocation());
@@ -449,7 +449,7 @@ protected AuditListener[] getListeners() throws ClassNotFoundException,
         final AuditListener[] listeners = new AuditListener[formatterCount];
 
         // formatters
-        if (mFormatters.size() == 0) {
+        if (mFormatters.isEmpty()) {
             final OutputStream debug = new LogOutputStream(this,
                     Project.MSG_DEBUG);
             final OutputStream err = new LogOutputStream(this, Project.MSG_ERR);

src/checkstyle/com/puppycrawl/tools/checkstyle/Checker.java

@@ -36,6 +36,7 @@
 import com.puppycrawl.tools.checkstyle.api.SeverityLevel;
 import com.puppycrawl.tools.checkstyle.api.SeverityLevelCounter;
 import com.puppycrawl.tools.checkstyle.api.Utils;
+
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
@@ -44,8 +45,8 @@
 import java.util.List;
 import java.util.Locale;
 import java.util.Set;
+import java.util.SortedSet;
 import java.util.StringTokenizer;
-import java.util.TreeSet;
 
 /**
  * This class provides the functionality to check a set of files.
@@ -254,7 +255,7 @@ public int process(List<File> aFiles)
         for (final File f : aFiles) {
             final String fileName = f.getAbsolutePath();
             fireFileStarted(fileName);
-            final TreeSet<LocalizedMessage> fileMessages = Sets.newTreeSet();
+            final SortedSet<LocalizedMessage> fileMessages = Sets.newTreeSet();
             try {
                 final FileText theText = new FileText(f.getAbsoluteFile(),
                         mCharset);
@@ -501,7 +502,8 @@ public void fireFileFinished(String aFileName)
      * @param aFileName the audited file
      * @param aErrors the audit errors from the file
      */
-    public void fireErrors(String aFileName, TreeSet<LocalizedMessage> aErrors)
+    public void fireErrors(String aFileName,
+        SortedSet<LocalizedMessage> aErrors)
     {
         final String stripped = getStrippedFileName(aFileName);
         for (final LocalizedMessage element : aErrors) {

src/checkstyle/com/puppycrawl/tools/checkstyle/api/MessageDispatcher.java

@@ -18,7 +18,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 package com.puppycrawl.tools.checkstyle.api;
 
-import java.util.TreeSet;
+import java.util.SortedSet;
 
 /**
  * Used by FileSetChecks to distribute AuditEvents to AuditListeners.
@@ -43,5 +43,5 @@ public interface MessageDispatcher
      * @param aFileName the audited file
      * @param aErrors the audit errors from the file
      */
-    void fireErrors(String aFileName, TreeSet<LocalizedMessage> aErrors);
+    void fireErrors(String aFileName, SortedSet<LocalizedMessage> aErrors);
 }

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/blocks/EmptyBlockCheck.java

@@ -101,13 +101,13 @@ public void visitToken(DetailAST aAST)
                         aAST.getText());
                 }
             }
-            else if (getAbstractOption() == BlockOption.TEXT) {
-                if (!hasText(slistAST)) {
-                    log(slistAST.getLineNo(),
-                        slistAST.getColumnNo(),
-                        "block.empty",
-                        aAST.getText());
-                }
+            else if (getAbstractOption() == BlockOption.TEXT
+                    && !hasText(slistAST))
+            {
+                log(slistAST.getLineNo(),
+                    slistAST.getColumnNo(),
+                    "block.empty",
+                    aAST.getText());
             }
         }
     }

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/coding/CovariantEqualsCheck.java

@@ -69,14 +69,14 @@ public void visitToken(DetailAST aAST)
         if (objBlock != null) {
             DetailAST child = objBlock.getFirstChild();
             while (child != null) {
-                if (child.getType() == TokenTypes.METHOD_DEF) {
-                    if (CheckUtils.isEqualsMethod(child)) {
-                        if (hasObjectParameter(child)) {
-                            hasEqualsObject = true;
-                        }
-                        else {
-                            mEqualsMethods.add(child);
-                        }
+                if (child.getType() == TokenTypes.METHOD_DEF
+                        && CheckUtils.isEqualsMethod(child))
+                {
+                    if (hasObjectParameter(child)) {
+                        hasEqualsObject = true;
+                    }
+                    else {
+                        mEqualsMethods.add(child);
                     }
                 }
                 child = child.getNextSibling();

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/coding/EqualsAvoidNullCheck.java

@@ -123,15 +123,18 @@ public void visitToken(final DetailAST aMethodCall)
         final DetailAST expr = dot.getNextSibling().getFirstChild();
 
         if ("equals".equals(method.getText())
-                || (!mIgnoreEqualsIgnoreCase && "equalsIgnoreCase"
-                        .equals(method.getText())))
+            && containsOneArg(expr) && containsAllSafeTokens(expr))
         {
-            if (containsOneArg(expr) && containsAllSafeTokens(expr)) {
-                log(aMethodCall.getLineNo(), aMethodCall.getColumnNo(),
-                    "equals".equals(method.getText())
-                    ? "equals.avoid.null"
-                    : "equalsIgnoreCase.avoid.null");
-            }
+            log(aMethodCall.getLineNo(), aMethodCall.getColumnNo(),
+                "equals.avoid.null");
+        }
+
+        if (!mIgnoreEqualsIgnoreCase
+            && "equalsIgnoreCase".equals(method.getText())
+            && containsOneArg(expr) && containsAllSafeTokens(expr))
+        {
+            log(aMethodCall.getLineNo(), aMethodCall.getColumnNo(),
+                "equalsIgnoreCase.avoid.null");
         }
     }
 

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/coding/FallThroughCheck.java

@@ -133,14 +133,14 @@ public void visitToken(DetailAST aAST)
 
         final DetailAST slist = aAST.findFirstToken(TokenTypes.SLIST);
 
-        if (!isTerminated(slist, true, true)) {
-            if (!hasFallTruComment(aAST, nextGroup)) {
-                if (!isLastGroup) {
-                    log(nextGroup, "fall.through");
-                }
-                else {
-                    log(aAST, "fall.through.last");
-                }
+        if (!isTerminated(slist, true, true)
+            && !hasFallTruComment(aAST, nextGroup))
+        {
+            if (!isLastGroup) {
+                log(nextGroup, "fall.through");
+            }
+            else {
+                log(aAST, "fall.through.last");
             }
         }
     }

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/coding/OneStatementPerLineCheck.java

@@ -99,10 +99,11 @@ public void leaveToken(DetailAST aAst)
     private void visitExpr(DetailAST aAst)
     {
         mExprDepth++;
-        if (mExprDepth == 1) {
-            if (!mInForHeader && (mLastStatementEnd == aAst.getLineNo())) {
-                log(aAst, "multiple.statements.line");
-            }
+        if (mExprDepth == 1
+                && !mInForHeader
+                && (mLastStatementEnd == aAst.getLineNo()))
+        {
+            log(aAst, "multiple.statements.line");
         }
     }
 

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/coding/RedundantThrowsCheck.java

@@ -134,11 +134,9 @@ private void checkException(FullIdent aExc, List<ClassInfo> aKnownExcs)
         final ClassInfo newClassInfo =
             createClassInfo(new Token(aExc), getCurrentClassName());
 
-        if (!mAllowUnchecked) {
-            if (isUnchecked(newClassInfo.getClazz())) {
-                log(aExc.getLineNo(), aExc.getColumnNo(),
-                    "redundant.throws.unchecked", aExc.getText());
-            }
+        if (!mAllowUnchecked && isUnchecked(newClassInfo.getClazz())) {
+            log(aExc.getLineNo(), aExc.getColumnNo(),
+                "redundant.throws.unchecked", aExc.getText());
         }
 
         boolean shouldAdd = true;

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/duplicates/StrictDuplicateCodeCheck.java

@@ -430,11 +430,8 @@ private void findDuplicateFromLine(
             }
 
             final Collection<Integer> ignoreEntries = aIgnore.get(aILine);
-            // avoid Integer constructor whenever we can
-            if (ignoreEntries != null) {
-                if (ignoreEntries.contains(jLine)) {
-                    continue;
-                }
+            if (ignoreEntries != null && ignoreEntries.contains(jLine)) {
+                continue;
             }
 
             final int duplicateLines =

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/imports/ImportControlLoader.java

@@ -89,12 +89,12 @@ public void startElement(final String aNamespaceURI,
             mStack.push(new PkgControl(pkg));
         }
         else if ("subpackage".equals(aQName)) {
-            assert mStack.size() > 0;
+            assert !mStack.isEmpty();
             final String name = safeGet(aAtts, "name");
             mStack.push(new PkgControl(mStack.peek(), name));
         }
         else if ("allow".equals(aQName) || "disallow".equals(aQName)) {
-            assert mStack.size() > 0;
+            assert !mStack.isEmpty();
             // Need to handle either "pkg" or "class" attribute.
             // May have "exact-match" for "pkg"
             // May have "local-only"

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/imports/ImportOrderCheck.java

@@ -294,8 +294,7 @@ private void doVisitToken(FullIdent aIdent, boolean aIsStatic,
                 }
             }
             else if (groupIdx == mLastGroup) {
-                doVisitTokenInSameGroup(aIdent, aIsStatic, aPrevious, name,
-                        line);
+                doVisitTokenInSameGroup(aIsStatic, aPrevious, name, line);
             }
             else {
                 log(line, "import.ordering", name);
@@ -309,14 +308,13 @@ else if (groupIdx == mLastGroup) {
     /**
      * Shares processing...
      *
-     * @param aIdent the import to process.
      * @param aIsStatic whether the token is static or not.
      * @param aPrevious previous non-static but current is static (above), or
      *    previous static but current is non-static (under).
      * @param aName the name of the current import.
      * @param aLine the line of the current import.
      */
-    private void doVisitTokenInSameGroup(FullIdent aIdent, boolean aIsStatic,
+    private void doVisitTokenInSameGroup(boolean aIsStatic,
             boolean aPrevious, String aName, int aLine)
     {
         if (!mOrdered) {

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocMethodCheck.java

@@ -260,7 +260,7 @@ protected final void processAST(DetailAST aAST)
                 }
             }
             else {
-                checkComment(aAST, cmt, theScope);
+                checkComment(aAST, cmt);
             }
         }
     }
@@ -313,13 +313,12 @@ private boolean shouldCheck(final DetailAST aAST, final Scope aScope)
      *
      * @param aAST the token for the method
      * @param aComment the Javadoc comment
-     * @param aScope the scope of the method.
      */
-    private void checkComment(DetailAST aAST, TextBlock aComment, Scope aScope)
+    private void checkComment(DetailAST aAST, TextBlock aComment)
     {
         final List<JavadocTag> tags = getMethodTags(aComment);
 
-        if (hasShortCircuitTag(aAST, tags, aScope)) {
+        if (hasShortCircuitTag(aAST, tags)) {
             return;
         }
 
@@ -354,11 +353,10 @@ private void checkComment(DetailAST aAST, TextBlock aComment, Scope aScope)
      *
      * @param aAST the construct being checked
      * @param aTags the list of Javadoc tags associated with the construct
-     * @param aScope the scope of the construct
      * @return true if the construct has a short circuit tag.
      */
     private boolean hasShortCircuitTag(final DetailAST aAST,
-            final List<JavadocTag> aTags, final Scope aScope)
+            final List<JavadocTag> aTags)
     {
         // Check if it contains {@inheritDoc} tag
         if ((aTags.size() != 1)

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/javadoc/TagParser.java

@@ -74,7 +74,7 @@ public HtmlTag nextTag()
      */
     public boolean hasNextTag()
     {
-        return (mTags.size() > 0);
+        return !mTags.isEmpty();
     }
 
     /**

src/checkstyle/com/puppycrawl/tools/checkstyle/checks/whitespace/ParenPadCheck.java

@@ -91,14 +91,13 @@ public void visitToken(DetailAST aAST)
                 processLeft(theAst);
             }
         }
-        else if ((theAst.getParent() == null)
+        else if (((theAst.getParent() == null)
                  || (theAst.getParent().getType() != TokenTypes.TYPECAST)
                  || (theAst.getParent().findFirstToken(TokenTypes.RPAREN)
                      != theAst))
+                 && !isFollowsEmptyForIterator(theAst))
         {
-            if (!isFollowsEmptyForIterator(theAst)) {
-                processRight(theAst);
-            }
+            processRight(theAst);
         }
     }
 

src/checkstyle/com/puppycrawl/tools/checkstyle/filters/SuppressElement.java

@@ -154,18 +154,12 @@ public boolean accept(AuditEvent aEvent)
             return false;
         }
 
-        // reject if line matches a line CSV value.
-        if (mLineFilter != null) {
-            if (mLineFilter.accept(aEvent.getLine())) {
-                return false;
-            }
+        if (mLineFilter != null && mLineFilter.accept(aEvent.getLine())) {
+            return false;
         }
 
-        // reject if column matches a column CSV value.
-        if (mColumnFilter != null) {
-            if (mColumnFilter.accept(aEvent.getColumn())) {
-                return false;
-            }
+        if (mColumnFilter != null && mColumnFilter.accept(aEvent.getColumn())) {
+            return false;
         }
         return true;
     }

src/checkstyle/com/puppycrawl/tools/checkstyle/filters/SuppressWithNearbyCommentFilter.java

@@ -484,9 +484,9 @@ private void tagSuppressions(Collection<TextBlock> aComments)
         for (final TextBlock comment : aComments) {
             final int startLineNo = comment.getStartLineNo();
             final String[] text = comment.getText();
-            tagCommentLine(text[0], startLineNo, comment.getStartColNo());
+            tagCommentLine(text[0], startLineNo);
             for (int i = 1; i < text.length; i++) {
-                tagCommentLine(text[i], startLineNo + i, 0);
+                tagCommentLine(text[i], startLineNo + i);
             }
         }
     }
@@ -496,9 +496,8 @@ private void tagSuppressions(Collection<TextBlock> aComments)
      * checkstyle reporting on or the format for turning reporting off.
      * @param aText the string to tag.
      * @param aLine the line number of aText.
-     * @param aColumn the column number of aText.
      */
-    private void tagCommentLine(String aText, int aLine, int aColumn)
+    private void tagCommentLine(String aText, int aLine)
     {
         final Matcher matcher = mCommentRegexp.matcher(aText);
         if (matcher.find()) {