some cleanup and added javadocs, upgrade to junit5

src/main/java/nl/sander/jsontoy2/JavaObjectReaderFactory.java

@@ -7,12 +7,15 @@ import org.jetbrains.annotations.NotNull;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
-import java.util.Arrays;
 import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 
+/**
+ * Responsible for generating classes that parse into java beans.
+ * <p>
+ * TODO remove javassist both for analysing java beans and for generating bytecode
+ */
 public class JavaObjectReaderFactory {
     public static final String ROOT_PACKAGE = "serializer.";
     private final static CtClass DESERIALIZER_BASE = Javassist.getTypeDefinition(JsonValueReader.class);
@@ -21,13 +24,6 @@ public class JavaObjectReaderFactory {
     private static final Class<?>[] NO_PARAMS = {};
     private static final CtClass[] CT_NO_PARAMS = {};
     private final static CtClass OBJECT_CLASS = Javassist.getTypeDefinition(Object.class);
-    private final static CtClass BOOLEAN = Javassist.getTypeDefinition(boolean.class);
-    private final static CtClass INT = Javassist.getTypeDefinition(int.class);
-    private final static CtClass LONG = Javassist.getTypeDefinition(long.class);
-    private final static CtClass BYTE = Javassist.getTypeDefinition(byte.class);
-    private final static CtClass SHORT = Javassist.getTypeDefinition(short.class);
-    private final static CtClass FLOAT = Javassist.getTypeDefinition(float.class);
-    private final static CtClass DOUBLE = Javassist.getTypeDefinition(double.class);
 
     @SuppressWarnings("unchecked")
     static <T> JsonValueReader<T> createReaderInstance(Class<T> type) {
@@ -56,7 +52,7 @@ public class JavaObjectReaderFactory {
     private static CtMethod createReadJsonMethod(CtClass serializerClass, Class<?> type) {
         try {
             String readMethodBodySource = createReadMethodBodySource(type);
-            System.out.println(readMethodBodySource);
+//            System.out.println(readMethodBodySource);
             return CtNewMethod.make(Modifier.PUBLIC, OBJECT_CLASS, "read", PARSER_PARAM, NO_EXCEPTIONS, readMethodBodySource, serializerClass);
         } catch (CannotCompileException e) {
             throw new ClassCreationException(e);
@@ -110,7 +106,7 @@ public class JavaObjectReaderFactory {
         }
     }
 
-
+    //should be reinstated
     private static String genericType(CtField field) {
         try {
             if (!Javassist.isCollection(field.getType())) {
@@ -138,10 +134,6 @@ public class JavaObjectReaderFactory {
         return lowercase.substring(0, 1).toUpperCase() + lowercase.substring(1);
     }
 
-    private static Set<String> createTypeList(Class<?>... classes) {
-        return Arrays.stream(classes).map(Class::getName).collect(Collectors.toSet());
-    }
-
     /*
      * custom root package is prepended to avoid the java.lang class in which it's illegal to create new classes
      *

src/main/java/nl/sander/jsontoy2/JsonReader.java

@@ -1,21 +1,16 @@
 package nl.sander.jsontoy2;
 
 import java.io.BufferedInputStream;
-import java.io.ByteArrayInputStream;
 import java.io.InputStream;
-import java.lang.ref.SoftReference;
-import java.nio.charset.StandardCharsets;
 import java.util.Map;
-import java.util.Objects;
 
 /**
  * public api
  */
 public class JsonReader {
 
-
-    private final static ThreadLocal<SoftReference<Parser>> PARSERS = new ThreadLocal<>();
-
+    private JsonReader() {
+    }
 
     /**
      * reads a value from a stream for a type that is not known beforehand
@@ -32,7 +27,7 @@ public class JsonReader {
      */
     public static Object read(InputStream inputStream) {
         final InputStream in = ensureBufferedStream(inputStream);
-        try (Parser parser = getParser(in)) {
+        try (Parser parser = ParserFactory.getParser(in)) {
             return read(parser);
         }
     }
@@ -44,7 +39,7 @@ public class JsonReader {
      * @return @see read(InputStream stream)
      */
     public static Object read(String jsonString) {
-        return read(getParser(jsonString));
+        return read(ParserFactory.getParser(jsonString));
     }
 
     /**
@@ -56,7 +51,7 @@ public class JsonReader {
      * @return Object the specified type
      */
     public static <T> T read(Class<T> type, InputStream inputStream) {
-        Parser parser = getParser(inputStream);
+        Parser parser = ParserFactory.getParser(inputStream);
         T value = read(type, parser);
         parser.close();
         return value;
@@ -71,31 +66,15 @@ public class JsonReader {
      * @return Object the specified type
      */
     public static <T> T read(Class<T> type, String jsonString) {
-        return read(type, getParser(jsonString));
+        return read(type, ParserFactory.getParser(jsonString));
     }
 
-    private static Parser getParser(String jsonString) {
-        return getParser(new ByteArrayInputStream(jsonString.getBytes(StandardCharsets.UTF_8)));
-    }
-
-    private static Parser getParser(InputStream inputStream) {
-        Objects.requireNonNull(inputStream, "File not found");
-        Parser parser;
-        SoftReference<Parser> parserReference = PARSERS.get();
-        if (parserReference == null || (parser = parserReference.get()) == null) {
-            parser = new Parser(inputStream);
-            parserReference = new SoftReference<>(parser);
-            PARSERS.set(parserReference);
-        } else {
-            parser.init(inputStream);
-        }
-        return parser;
-    }
 
     static Object read(Parser parser) {
         return parser.parseAny();
     }
 
+    //TODO should not be public
     @SuppressWarnings("unchecked")
     public static <T> T read(Class<T> type, Parser parser) {
         return (T) ReaderFactory.getReader(type).read(parser);

src/main/java/nl/sander/jsontoy2/ParserFactory.java

@@ -0,0 +1,38 @@
+package nl.sander.jsontoy2;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.lang.ref.SoftReference;
+import java.nio.charset.StandardCharsets;
+import java.util.Objects;
+
+/**
+ * Keeps a Threadlocal parser that can be (re)used by clients.
+ * <p>
+ * The parser is not kept indefinitely, but garbage collected when the JVM considers necessary.
+ */
+public class ParserFactory {
+
+    private final static ThreadLocal<SoftReference<Parser>> PARSERS = new ThreadLocal<>();
+
+    private ParserFactory() {
+    }
+
+    static Parser getParser(String jsonString) {
+        return getParser(new ByteArrayInputStream(jsonString.getBytes(StandardCharsets.UTF_8)));
+    }
+
+    static Parser getParser(InputStream inputStream) {
+        Objects.requireNonNull(inputStream, "File not found");
+        Parser parser;
+        SoftReference<Parser> parserReference = PARSERS.get();
+        if (parserReference == null || (parser = parserReference.get()) == null) {
+            parser = new Parser(inputStream);
+            parserReference = new SoftReference<>(parser);
+            PARSERS.set(parserReference);
+        } else {
+            parser.init(inputStream);
+        }
+        return parser;
+    }
+}

src/main/java/nl/sander/jsontoy2/ReaderFactory.java

@@ -18,7 +18,10 @@ public class ReaderFactory {
         registerPrimitiveTypeReaders();
     }
 
-    public <T> void registerCustomReader(Class<T> type, JsonValueReader<T> reader) {
+    private ReaderFactory() {
+    }
+
+    public static <T> void registerCustomReader(Class<T> type, JsonValueReader<T> reader) {
         readers.put(type, reader);
     }
 

src/test/java/nl/sander/jsontoy2/WrapperObjectTests.java

@@ -6,8 +6,7 @@ import org.junit.jupiter.api.Test;
 import java.util.Arrays;
 import java.util.HashSet;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.*;
 
 public class WrapperObjectTests {
 
@@ -22,9 +21,9 @@ public class WrapperObjectTests {
 
     @Test
     public void testBoolean() {
-//        BooleanBean trueBean = JsonReader.read(BooleanBean.class, "{\"value\": true}");
-//        assertTrue(trueBean.isValue());
-        // second call to read, must not recreate class definition, would not compile
+        BooleanBean trueBean = JsonReader.read(BooleanBean.class, "{\"value\": true}");
+        assertTrue(trueBean.isValue());
+        // second call to read, must not recreate class definition, (it would not compile)
         // so this test implicitly tests caching function too
         BooleanBean falseBean = JsonReader.read(BooleanBean.class, "{\"value2\": false}");
         assertFalse(falseBean.isValue());