PDFBOX-5660: Sonar fix

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1924896 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

fontbox/src/test/java/org/apache/fontbox/ttf/GlyphSubstitutionTableTest.java

@@ -102,7 +102,7 @@ private Map<List<Integer>, List<Integer>> getExpectedGsubTableRawData(String pat
                     break;
                 }
 
-                if (line.trim().length() == 0)
+                if (line.isBlank())
                 {
                     continue;
                 }

pdfbox/src/test/java/org/apache/pdfbox/text/BidiTest.java

@@ -153,12 +153,12 @@ private void doTestFile(File inFile, File outDir, boolean bLogResult, boolean bS
             while (true)
             {
                 String expectedLine = expectedReader.readLine();
-                while( expectedLine != null && expectedLine.trim().length() == 0 )
+                while (expectedLine != null && expectedLine.isBlank())
                 {
                     expectedLine = expectedReader.readLine();
                 }
                 String actualLine = actualReader.readLine();
-                while( actualLine != null && actualLine.trim().length() == 0 )
+                while (actualLine != null && actualLine.isBlank())
                 {
                     actualLine = actualReader.readLine();
                 }

pdfbox/src/test/java/org/apache/pdfbox/text/TestTextStripper.java

@@ -317,12 +317,12 @@ private void compareResult(File expectedFile, File outFile, File inFile, boolean
             while (true)
             {
                 String expectedLine = expectedReader.readLine();
-                while( expectedLine != null && expectedLine.trim().length() == 0 )
+                while (expectedLine != null && expectedLine.isBlank())
                 {
                     expectedLine = expectedReader.readLine();
                 }
                 String actualLine = actualReader.readLine();
-                while( actualLine != null && actualLine.trim().length() == 0 )
+                while (actualLine != null && actualLine.isBlank())
                 {
                     actualLine = actualReader.readLine();
                 }
@@ -567,7 +567,7 @@ void testExtract() throws Exception
         File inDirExt = new File("target/test-input-ext");
         File outDirExt = new File("target/test-output-ext");
 
-            if ((filename == null) || (filename.length() == 0)) 
+            if (filename == null || filename.isEmpty())
             {
                 doTestDir(inDir, outDir);
                 if (inDirExt.exists())