Add Pascal Case function

jolt-core/src/main/java/com/bazaarvoice/jolt/Modifier.java

@@ -43,6 +43,7 @@ public abstract class Modifier implements SpecDriven, ContextualTransform {
     static {
         STOCK_FUNCTIONS.put( "toLower", new Strings.toLowerCase() );
         STOCK_FUNCTIONS.put( "toUpper", new Strings.toUpperCase() );
+        STOCK_FUNCTIONS.put( "toPascal", new Strings.toPascalCase() );
         STOCK_FUNCTIONS.put( "concat", new Strings.concat() );
         STOCK_FUNCTIONS.put( "join", new Strings.join() );
         STOCK_FUNCTIONS.put( "split", new Strings.split() );

jolt-core/src/main/java/com/bazaarvoice/jolt/modifier/function/Strings.java

@@ -51,6 +51,33 @@ protected Optional<String> applySingle( final Object arg ) {
         }
     }
 
+    public static final class toPascalCase extends Function.SingleFunction<String> {
+        @Override
+        protected Optional<String> applySingle( final Object arg ) {
+
+            if ( ! (arg instanceof String) ) {
+                return Optional.empty();
+            }
+
+            String argString = (String) arg;
+            boolean capital = true;
+            StringBuilder result = new StringBuilder();
+            for(int i=0; i< argString.length(); i++) {
+                char currentChar = argString.charAt(i);
+                if(Character.isLetter(currentChar) && capital) {
+                    result.append(Character.toUpperCase(currentChar));
+                    capital = false;
+                } else if(Character.isLetter(currentChar)) {
+                    result.append(Character.toLowerCase(currentChar));
+                } else {
+                    result.append(currentChar);
+                    capital = true;
+                }
+            }
+            return Optional.of(result.toString());
+        }
+    }
+
     public static final class trim extends Function.SingleFunction<String> {
         @Override
         protected Optional<String> applySingle( final Object arg ) {
@@ -233,4 +260,5 @@ private static Optional<Object> padString( boolean leftPad, String source, List<
 
         return Optional.empty();
     }
-}
+
+}

jolt-core/src/test/java/com/bazaarvoice/jolt/modifier/function/StringsTest.java

@@ -32,6 +32,7 @@ public Iterator<Object[]> getTestCases() {
     List<Object[]> testCases = new LinkedList<>(  );
 
     Function SPLIT = new Strings.split();
+    Function TO_PASCAL = new Strings.toPascalCase();
 
     testCases.add( new Object[] {"split-invalid-null", SPLIT, null, Optional.empty() } );
     testCases.add( new Object[] {"split-invalid-string", SPLIT, "", Optional.empty() } );
@@ -50,6 +51,10 @@ public Iterator<Object[]> getTestCases() {
     testCases.add( new Object[] {"split-regex-token-string", SPLIT, new Object[] {"[eE]", "test,TEST"}, Optional.of( Arrays.asList("t", "st,T", "ST") )} );
     testCases.add( new Object[] {"split-regex2-token-string", SPLIT, new Object[] {"\\s+", "test TEST  Test    TeSt"}, Optional.of( Arrays.asList("test", "TEST", "Test", "TeSt") )} );
 
+    testCases.add( new Object[] {"to-pascal-empty-string", TO_PASCAL, new Object[] {""}, Optional.of("")} );
+    testCases.add( new Object[] {"to-pascal-two-strings", TO_PASCAL, new Object[] {"tESt tesT"}, Optional.of("Test Test")} );
+    testCases.add( new Object[] {"to-pascal-separated-by-dot", TO_PASCAL, new Object[] {"tESt.tesT.tEsT"}, Optional.of("Test.Test.Test")} );
+
     return testCases.iterator();
   }
 }

jolt-core/src/test/resources/json/modifier/functions/stringsTests.json

@@ -49,6 +49,13 @@
         "trim" :{
             "trimed" : "=trim(@(2,trimMe))"
         },
+        "pascal" :{
+            "leading":  "=toPascal(@(2,string))",
+            "trailing": "=toPascal(^value)",
+            "custom1":  "=toPascal(bazinga)",
+            "custom2":  "=toPascal('yabadabadoo')",
+            "badArgs1"  :  "=toPascal(@2)"
+        },
         "trimMe" : "=trim"
     },
     "context": {
@@ -90,6 +97,12 @@
             "custom2": "fox",
             "advancedLookupRanges": "the"
         },
+        "pascal": {
+            "leading": "The Quick Brown Fox",
+            "trailing": "Jumped Over The Lazy Dog",
+            "custom1": "Bazinga",
+            "custom2": "Yabadabadoo"
+        },
         "trim" :{
             "trimed" : "tuna"
         }