/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.bcel.generic;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.junit.jupiter.api.Assertions.fail;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.bcel.AbstractTestCase;
  import org.apache.bcel.Const;
  import org.apache.bcel.classfile.AnnotationEntry;
  import org.apache.bcel.classfile.ArrayElementValue;
  import org.apache.bcel.classfile.ElementValue;
  import org.apache.bcel.classfile.ElementValuePair;
  import org.apache.bcel.classfile.JavaClass;
  import org.apache.bcel.classfile.Method;
  import org.apache.bcel.classfile.ParameterAnnotationEntry;
  import org.apache.bcel.classfile.SimpleElementValue;
  import org.apache.bcel.util.SyntheticRepository;
  import org.junit.jupiter.api.Test;
  
  /**
   * The program that some of the tests generate looks like this:
   *
   * <pre>
   * public class HelloWorld {
   *     public static void main(String[] argv) {
   *         BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
   *         String name = null;
   *
   *         try {
   *             name = &quot;Andy&quot;;
   *         } catch (IOException e) {
   *             return;
   *         }
   *         System.out.println(&quot;Hello, &quot; + name);
   *     }
   * }
   * </pre>
   */
  public class GeneratingAnnotatedClassesTestCase extends AbstractTestCase {
      private void assertArrayElementValue(final int nExpectedArrayValues, final AnnotationEntry anno) {
          final ElementValuePair elementValuePair = anno.getElementValuePairs()[0];
          assertEquals("value", elementValuePair.getNameString());
          final ArrayElementValue ev = (ArrayElementValue) elementValuePair.getValue();
          final ElementValue[] eva = ev.getElementValuesArray();
          assertEquals(nExpectedArrayValues, eva.length);
      }
  
      private void assertMethodAnnotations(final Method method, final int expectedNumberAnnotations, final int nExpectedArrayValues) {
          final String methodName = method.getName();
          final AnnotationEntry[] annos = method.getAnnotationEntries();
          assertEquals(expectedNumberAnnotations, annos.length, () -> "For " + methodName);
          if (expectedNumberAnnotations != 0) {
              assertArrayElementValue(nExpectedArrayValues, annos[0]);
          }
      }
  
      private void assertParameterAnnotations(final Method method, final int... expectedNumberOfParmeterAnnotations) {
          final String methodName = "For " + method.getName();
          final ParameterAnnotationEntry[] parameterAnnotations = method.getParameterAnnotationEntries();
          assertEquals(expectedNumberOfParmeterAnnotations.length, parameterAnnotations.length, methodName);
  
          int i = 0;
          for (final ParameterAnnotationEntry parameterAnnotation : parameterAnnotations) {
              final AnnotationEntry[] annos = parameterAnnotation.getAnnotationEntries();
              final int expectedLength = expectedNumberOfParmeterAnnotations[i++];
              final int j = i;
              assertEquals(expectedLength, annos.length, () -> methodName + " parameter " + j);
              if (expectedLength != 0) {
                  assertSimpleElementValue(annos[0]);
              }
          }
          assertNotNull(method.getAttribute(Const.ATTR_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS));
          assertNull(method.getAttribute(Const.ATTR_RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS));
      }
  
      private void assertSimpleElementValue(final AnnotationEntry anno) {
          final ElementValuePair elementValuePair = anno.getElementValuePairs()[0];
         assertEquals("id", elementValuePair.getNameString());
         final SimpleElementValue ev = (SimpleElementValue) elementValuePair.getValue();
         assertEquals(42, ev.getValueInt());
     }
 
     private void buildClassContents(final ClassGen cg, final ConstantPoolGen cp, final InstructionList il) {
         // Create method 'public static void main(String[]argv)'
         final MethodGen mg = createMethodGen("main", il, cp);
         final InstructionFactory factory = new InstructionFactory(cg);
         // We now define some often used types:
         final ObjectType iStream = new ObjectType("java.io.InputStream");
         final ObjectType pStream = new ObjectType("java.io.PrintStream");
         // Create variables in and name : We call the constructors, i.e.,
         // execute BufferedReader(InputStreamReader(System.in)) . The reference
         // to the BufferedReader object stays on top of the stack and is stored
         // in the newly allocated in variable.
         il.append(factory.createNew("java.io.BufferedReader"));
         il.append(InstructionConst.DUP); // Use predefined constant
         il.append(factory.createNew("java.io.InputStreamReader"));
         il.append(InstructionConst.DUP);
         il.append(factory.createFieldAccess("java.lang.System", "in", iStream, Const.GETSTATIC));
         il.append(factory.createInvoke("java.io.InputStreamReader", "<init>", Type.VOID, new Type[] {iStream}, Const.INVOKESPECIAL));
         il.append(factory.createInvoke("java.io.BufferedReader", "<init>", Type.VOID, new Type[] {new ObjectType("java.io.Reader")}, Const.INVOKESPECIAL));
         LocalVariableGen lg = mg.addLocalVariable("in", new ObjectType("java.io.BufferedReader"), null, null);
         final int in = lg.getIndex();
         lg.setStart(il.append(new ASTORE(in))); // "in" valid from here
         // Create local variable name and initialize it to null
         lg = mg.addLocalVariable("name", Type.STRING, null, null);
         final int name = lg.getIndex();
         il.append(InstructionConst.ACONST_NULL);
         lg.setStart(il.append(new ASTORE(name))); // "name" valid from here
         // Create try-catch block: We remember the start of the block, read a
         // line from the standard input and store it into the variable name .
         // InstructionHandle try_start = il.append(factory.createFieldAccess(
         // "java.lang.System", "out", p_stream, Constants.GETSTATIC));
         // il.append(new PUSH(cp, "Please enter your name> "));
         // il.append(factory.createInvoke("java.io.PrintStream", "print",
         // Type.VOID, new Type[] { Type.STRING },
         // Constants.INVOKEVIRTUAL));
         // il.append(new ALOAD(in));
         // il.append(factory.createInvoke("java.io.BufferedReader", "readLine",
         // Type.STRING, Type.NO_ARGS, Constants.INVOKEVIRTUAL));
         final InstructionHandle tryStart = il.append(new PUSH(cp, "Andy"));
         il.append(new ASTORE(name));
         // Upon normal execution we jump behind exception handler, the target
         // address is not known yet.
         final GOTO g = new GOTO(null);
         final InstructionHandle tryEnd = il.append(g);
         // We add the exception handler which simply returns from the method.
         final LocalVariableGen varEx = mg.addLocalVariable("ex", Type.getType("Ljava.io.IOException;"), null, null);
         final int varExSlot = varEx.getIndex();
         final InstructionHandle handler = il.append(new ASTORE(varExSlot));
         varEx.setStart(handler);
         varEx.setEnd(il.append(InstructionConst.RETURN));
         mg.addExceptionHandler(tryStart, tryEnd, handler, new ObjectType("java.io.IOException"));
         // "Normal" code continues, now we can set the branch target of the GOTO
         // .
         final InstructionHandle ih = il.append(factory.createFieldAccess("java.lang.System", "out", pStream, Const.GETSTATIC));
         g.setTarget(ih);
         // Printing "Hello": String concatenation compiles to StringBuffer
         // operations.
         il.append(factory.createNew(Type.STRINGBUFFER));
         il.append(InstructionConst.DUP);
         il.append(new PUSH(cp, "Hello, "));
         il.append(factory.createInvoke("java.lang.StringBuffer", "<init>", Type.VOID, new Type[] {Type.STRING}, Const.INVOKESPECIAL));
         il.append(new ALOAD(name));
         il.append(factory.createInvoke("java.lang.StringBuffer", "append", Type.STRINGBUFFER, new Type[] {Type.STRING}, Const.INVOKEVIRTUAL));
         il.append(factory.createInvoke("java.lang.StringBuffer", "toString", Type.STRING, Type.NO_ARGS, Const.INVOKEVIRTUAL));
         il.append(factory.createInvoke("java.io.PrintStream", "println", Type.VOID, new Type[] {Type.STRING}, Const.INVOKEVIRTUAL));
         il.append(InstructionConst.RETURN);
         // Finalization: Finally, we have to set the stack size, which normally
         // would have to be computed on the fly and add a default constructor
         // method to the class, which is empty in this case.
         mg.setMaxStack();
         mg.setMaxLocals();
         cg.addMethod(mg.getMethod());
         il.dispose(); // Allow instruction handles to be reused
         cg.addEmptyConstructor(Const.ACC_PUBLIC);
     }
 
     private void buildClassContentsWithAnnotatedMethods(final ClassGen cg, final ConstantPoolGen cp, final InstructionList il) {
         // Create method 'public static void main(String[]argv)'
         final MethodGen mg = createMethodGen("main", il, cp);
         final InstructionFactory factory = new InstructionFactory(cg);
         mg.addAnnotationEntry(createSimpleVisibleAnnotation(mg.getConstantPool()));
         // We now define some often used types:
         final ObjectType iStream = new ObjectType("java.io.InputStream");
         final ObjectType pStream = new ObjectType("java.io.PrintStream");
         // Create variables in and name : We call the constructors, i.e.,
         // execute BufferedReader(InputStreamReader(System.in)) . The reference
         // to the BufferedReader object stays on top of the stack and is stored
         // in the newly allocated in variable.
         il.append(factory.createNew("java.io.BufferedReader"));
         il.append(InstructionConst.DUP); // Use predefined constant
         il.append(factory.createNew("java.io.InputStreamReader"));
         il.append(InstructionConst.DUP);
         il.append(factory.createFieldAccess("java.lang.System", "in", iStream, Const.GETSTATIC));
         il.append(factory.createInvoke("java.io.InputStreamReader", "<init>", Type.VOID, new Type[] {iStream}, Const.INVOKESPECIAL));
         il.append(factory.createInvoke("java.io.BufferedReader", "<init>", Type.VOID, new Type[] {new ObjectType("java.io.Reader")}, Const.INVOKESPECIAL));
         LocalVariableGen lg = mg.addLocalVariable("in", new ObjectType("java.io.BufferedReader"), null, null);
         final int in = lg.getIndex();
         lg.setStart(il.append(new ASTORE(in))); // "in" valid from here
         // Create local variable name and initialize it to null
         lg = mg.addLocalVariable("name", Type.STRING, null, null);
         final int name = lg.getIndex();
         il.append(InstructionConst.ACONST_NULL);
         lg.setStart(il.append(new ASTORE(name))); // "name" valid from here
         // Create try-catch block: We remember the start of the block, read a
         // line from the standard input and store it into the variable name .
         // InstructionHandle try_start = il.append(factory.createFieldAccess(
         // "java.lang.System", "out", p_stream, Constants.GETSTATIC));
         // il.append(new PUSH(cp, "Please enter your name> "));
         // il.append(factory.createInvoke("java.io.PrintStream", "print",
         // Type.VOID, new Type[] { Type.STRING },
         // Constants.INVOKEVIRTUAL));
         // il.append(new ALOAD(in));
         // il.append(factory.createInvoke("java.io.BufferedReader", "readLine",
         // Type.STRING, Type.NO_ARGS, Constants.INVOKEVIRTUAL));
         final InstructionHandle tryStart = il.append(new PUSH(cp, "Andy"));
         il.append(new ASTORE(name));
         // Upon normal execution we jump behind exception handler, the target
         // address is not known yet.
         final GOTO g = new GOTO(null);
         final InstructionHandle tryEnd = il.append(g);
         // We add the exception handler which simply returns from the method.
         final LocalVariableGen varEx = mg.addLocalVariable("ex", Type.getType("Ljava.io.IOException;"), null, null);
         final int varExSlot = varEx.getIndex();
         final InstructionHandle handler = il.append(new ASTORE(varExSlot));
         varEx.setStart(handler);
         varEx.setEnd(il.append(InstructionConst.RETURN));
         mg.addExceptionHandler(tryStart, tryEnd, handler, new ObjectType("java.io.IOException"));
         // "Normal" code continues, now we can set the branch target of the GOTO
         // .
         final InstructionHandle ih = il.append(factory.createFieldAccess("java.lang.System", "out", pStream, Const.GETSTATIC));
         g.setTarget(ih);
         // Printing "Hello": String concatenation compiles to StringBuffer
         // operations.
         il.append(factory.createNew(Type.STRINGBUFFER));
         il.append(InstructionConst.DUP);
         il.append(new PUSH(cp, "Hello, "));
         il.append(factory.createInvoke("java.lang.StringBuffer", "<init>", Type.VOID, new Type[] {Type.STRING}, Const.INVOKESPECIAL));
         il.append(new ALOAD(name));
         il.append(factory.createInvoke("java.lang.StringBuffer", "append", Type.STRINGBUFFER, new Type[] {Type.STRING}, Const.INVOKEVIRTUAL));
         il.append(factory.createInvoke("java.lang.StringBuffer", "toString", Type.STRING, Type.NO_ARGS, Const.INVOKEVIRTUAL));
         il.append(factory.createInvoke("java.io.PrintStream", "println", Type.VOID, new Type[] {Type.STRING}, Const.INVOKEVIRTUAL));
         il.append(InstructionConst.RETURN);
         // Finalization: Finally, we have to set the stack size, which normally
         // would have to be computed on the fly and add a default constructor
         // method to the class, which is empty in this case.
         mg.setMaxStack();
         mg.setMaxLocals();
         cg.addMethod(mg.getMethod());
         il.dispose(); // Allow instruction handles to be reused
         cg.addEmptyConstructor(Const.ACC_PUBLIC);
     }
 
     // helper methods
     private ClassGen createClassGen(final String className) {
         return new ClassGen(className, "java.lang.Object", "<generated>", Const.ACC_PUBLIC | Const.ACC_SUPER, null);
     }
 
     public AnnotationEntryGen createCombinedAnnotation(final ConstantPoolGen cp) {
         // Create an annotation instance
         final AnnotationEntryGen a = createSimpleVisibleAnnotation(cp);
         final ArrayElementValueGen array = new ArrayElementValueGen(cp);
         array.addElement(new AnnotationElementValueGen(a, cp));
         final ElementValuePairGen nvp = new ElementValuePairGen("value", array, cp);
         final List<ElementValuePairGen> elements = new ArrayList<>();
         elements.add(nvp);
         return new AnnotationEntryGen(new ObjectType("CombinedAnnotation"), elements, true, cp);
     }
 
     public AnnotationEntryGen createFruitAnnotation(final ConstantPoolGen cp, final String aFruit) {
         final SimpleElementValueGen evg = new SimpleElementValueGen(ElementValueGen.STRING, cp, aFruit);
         final ElementValuePairGen nvGen = new ElementValuePairGen("fruit", evg, cp);
         final ObjectType t = new ObjectType("SimpleStringAnnotation");
         final List<ElementValuePairGen> elements = new ArrayList<>();
         elements.add(nvGen);
         return new AnnotationEntryGen(t, elements, true, cp);
     }
 
     private MethodGen createMethodGen(final String methodname, final InstructionList il, final ConstantPoolGen cp) {
         return new MethodGen(Const.ACC_STATIC | Const.ACC_PUBLIC, // access
             // flags
             Type.VOID, // return type
             new Type[] {new ArrayType(Type.STRING, 1)}, // argument
             // types
             new String[] {"argv"}, // arg names
             methodname, "HelloWorld", // method, class
             il, cp);
     }
 
     public AnnotationEntryGen createSimpleInvisibleAnnotation(final ConstantPoolGen cp) {
         final SimpleElementValueGen evg = new SimpleElementValueGen(ElementValueGen.PRIMITIVE_INT, cp, 4);
         final ElementValuePairGen nvGen = new ElementValuePairGen("id", evg, cp);
         final ObjectType t = new ObjectType("SimpleAnnotation");
         final List<ElementValuePairGen> elements = new ArrayList<>();
         elements.add(nvGen);
         return new AnnotationEntryGen(t, elements, false, cp);
     }
 
     public AnnotationEntryGen createSimpleVisibleAnnotation(final ConstantPoolGen cp) {
         final SimpleElementValueGen evg = new SimpleElementValueGen(ElementValueGen.PRIMITIVE_INT, cp, 4);
         final ElementValuePairGen nvGen = new ElementValuePairGen("id", evg, cp);
         final ObjectType t = new ObjectType("SimpleAnnotation");
         final List<ElementValuePairGen> elements = new ArrayList<>();
         elements.add(nvGen);
         return new AnnotationEntryGen(t, elements, true, cp);
     }
 
     private void dumpClass(final ClassGen cg, final String fname) {
         try {
             final File f = createTestdataFile(fname);
             cg.getJavaClass().dump(f);
         } catch (final java.io.IOException e) {
             System.err.println(e);
         }
     }
 
     private void dumpClass(final ClassGen cg, final String dir, final String fname) {
         dumpClass(cg, dir + File.separator + fname);
     }
 
     private JavaClass getClassFrom(final String where, final String clazzname) throws ClassNotFoundException {
         // System.out.println(where);
         final SyntheticRepository repos = createRepos(where);
         return repos.loadClass(clazzname);
     }
 
     /**
      * Steps in the test:
      * <ol>
      * <li>Programmatically construct the HelloWorld program</li>
      * <li>Add two simple annotations at the class level</li>
      * <li>Save the class to disk</li>
      * <li>Reload the class using the 'static' variant of the BCEL classes</li>
      * <li>Check the attributes are OK</li>
      * </ol>
      */
     @Test
     public void testGenerateClassLevelAnnotations() throws ClassNotFoundException {
         // Create HelloWorld
         final ClassGen cg = createClassGen("HelloWorld");
         cg.setMajor(49);
         cg.setMinor(0);
         final ConstantPoolGen cp = cg.getConstantPool();
         final InstructionList il = new InstructionList();
         cg.addAnnotationEntry(createSimpleVisibleAnnotation(cp));
         cg.addAnnotationEntry(createSimpleInvisibleAnnotation(cp));
         buildClassContents(cg, cp, il);
         // System.out.println(cg.getJavaClass().toString());
         dumpClass(cg, "HelloWorld.class");
         final JavaClass jc = getClassFrom(".", "HelloWorld");
         final AnnotationEntry[] as = jc.getAnnotationEntries();
         assertEquals(2, as.length, "Wrong number of AnnotationEntries");
         // TODO L??;
         assertEquals("LSimpleAnnotation;", as[0].getAnnotationType(), "Wrong name of annotation 1");
         assertEquals("LSimpleAnnotation;", as[1].getAnnotationType(), "Wrong name of annotation 2");
         final ElementValuePair[] vals = as[0].getElementValuePairs();
         final ElementValuePair nvp = vals[0];
         assertEquals("id", nvp.getNameString(), "Wrong name of element in SimpleAnnotation");
         final ElementValue ev = nvp.getValue();
         assertEquals(ElementValue.PRIMITIVE_INT, ev.getElementValueType(), "Wrong type of element value");
         assertEquals("4", ev.stringifyValue(), "Wrong value of element");
         assertTrue(createTestdataFile("HelloWorld.class").delete());
     }
 
     /**
      * Just check that we can dump a class that has a method annotation on it and it is still there when we read it back in
      */
     @Test
     public void testGenerateMethodLevelAnnotations1() throws ClassNotFoundException {
         // Create HelloWorld
         final ClassGen cg = createClassGen("HelloWorld");
         final ConstantPoolGen cp = cg.getConstantPool();
         final InstructionList il = new InstructionList();
         buildClassContentsWithAnnotatedMethods(cg, cp, il);
         // Check annotation is OK
         int i = cg.getMethods()[0].getAnnotationEntries().length;
         assertEquals(1, i, "Wrong number of annotations of main method prior to dumping");
         dumpClass(cg, "temp1" + File.separator + "HelloWorld.class");
         final JavaClass jc2 = getClassFrom("temp1", "HelloWorld");
         // Check annotation is OK
         i = jc2.getMethods()[0].getAnnotationEntries().length;
         assertEquals(1, i, "Wrong number of annotation on JavaClass");
         final ClassGen cg2 = new ClassGen(jc2);
         // Check it now it is a ClassGen
         final Method[] m = cg2.getMethods();
         i = m[0].getAnnotationEntries().length;
         assertEquals(1, i, "Wrong number of annotations on the main 'Method'");
         final FieldGenOrMethodGen mg = new MethodGen(m[0], cg2.getClassName(), cg2.getConstantPool());
         // Check it finally when the Method is changed to a MethodGen
         i = mg.getAnnotationEntries().length;
         assertEquals(1, i, "Wrong number of annotations on the main 'MethodGen'");
 
         assertTrue(delete("temp1", "HelloWorld.class"));
     }
 
     /**
      * Going further than the last test - when we reload the method back in, let's change it (adding a new annotation) and
      * then store that, read it back in and verify both annotations are there ! Also check that we can remove method
      * annotations.
      */
     @Test
     public void testGenerateMethodLevelAnnotations2() throws ClassNotFoundException {
         // Create HelloWorld
         final ClassGen cg = createClassGen("HelloWorld");
         final ConstantPoolGen cp = cg.getConstantPool();
         final InstructionList il = new InstructionList();
         buildClassContentsWithAnnotatedMethods(cg, cp, il);
         dumpClass(cg, "temp2", "HelloWorld.class");
         final JavaClass jc2 = getClassFrom("temp2", "HelloWorld");
         final ClassGen cg2 = new ClassGen(jc2);
         // Main method after reading the class back in
         final Method mainMethod1 = jc2.getMethods()[0];
         assertEquals(1, mainMethod1.getAnnotationEntries().length, "Wrong number of annotations of the 'Method'");
         final MethodGen mainMethod2 = new MethodGen(mainMethod1, cg2.getClassName(), cg2.getConstantPool());
         assertEquals(1, mainMethod2.getAnnotationEntries().length, "Wrong number of annotations of the 'MethodGen'");
         final AnnotationEntryGen fruit = createFruitAnnotation(cg2.getConstantPool(), "Pear");
         mainMethod2.addAnnotationEntry(fruit);
         cg2.removeMethod(mainMethod1);
         cg2.addMethod(mainMethod2.getMethod());
         dumpClass(cg2, "temp3", "HelloWorld.class");
         final JavaClass jc3 = getClassFrom("temp3", "HelloWorld");
         final ClassGen cg3 = new ClassGen(jc3);
         final Method mainMethod3 = cg3.getMethods()[1];
         final int i = mainMethod3.getAnnotationEntries().length;
         assertEquals(2, i, "Wrong number of annotations on the 'Method'");
         mainMethod2.removeAnnotationEntry(fruit);
         assertEquals(1, mainMethod2.getAnnotationEntries().length, "Wrong number of annotations on the 'MethodGen'");
         mainMethod2.removeAnnotationEntries();
         assertEquals(0, mainMethod2.getAnnotationEntries().length, 0, "Wrong number of annotations on the 'MethodGen'");
         assertTrue(delete("temp2", "HelloWorld.class"));
         assertTrue(delete("temp3", "HelloWorld.class"));
     }
 
     /**
      * Load a class in and modify it with a new attribute - A SimpleAnnotation annotation
      */
     @Test
     public void testModifyingClasses1() throws ClassNotFoundException {
         final JavaClass jc = getTestJavaClass(PACKAGE_BASE_NAME + ".data.SimpleAnnotatedClass");
         final ClassGen cgen = new ClassGen(jc);
         final ConstantPoolGen cp = cgen.getConstantPool();
         cgen.addAnnotationEntry(createFruitAnnotation(cp, "Pineapple"));
         assertEquals(2, cgen.getAnnotationEntries().length, "Wrong number of annotations");
         dumpClass(cgen, "SimpleAnnotatedClass.class");
         assertTrue(delete("SimpleAnnotatedClass.class"));
     }
 
     /**
      * Load a class in and modify it with a new attribute - A ComplexAnnotation annotation
      */
     @Test
     public void testModifyingClasses2() throws ClassNotFoundException {
         final JavaClass jc = getTestJavaClass(PACKAGE_BASE_NAME + ".data.SimpleAnnotatedClass");
         final ClassGen cgen = new ClassGen(jc);
         final ConstantPoolGen cp = cgen.getConstantPool();
         cgen.addAnnotationEntry(createCombinedAnnotation(cp));
         assertEquals(2, cgen.getAnnotationEntries().length, "Wrong number of annotations");
         dumpClass(cgen, "SimpleAnnotatedClass.class");
         final JavaClass jc2 = getClassFrom(".", "SimpleAnnotatedClass");
         jc2.getAnnotationEntries();
         assertTrue(delete("SimpleAnnotatedClass.class"));
         // System.err.println(jc2.toString());
     }
 
     /**
      * Transform simple class from an immutable to a mutable object. The class is annotated with an annotation that uses an
      * array of SimpleAnnotations.
      */
     @Test
     public void testTransformClassToClassGen_ArrayAndAnnotationTypes() throws ClassNotFoundException {
         final JavaClass jc = getTestJavaClass(PACKAGE_BASE_NAME + ".data.AnnotatedWithCombinedAnnotation");
         final ClassGen cgen = new ClassGen(jc);
         // Check annotations are correctly preserved
         final AnnotationEntryGen[] annotations = cgen.getAnnotationEntries();
         assertEquals(1, annotations.length, "Wrong number of annotations");
         final AnnotationEntryGen a = annotations[0];
         assertEquals(1, a.getValues().size(), "Wrong number of values for the annotation");
         final ElementValuePairGen nvp = a.getValues().get(0);
         final ElementValueGen value = nvp.getValue();
         assertTrue(value instanceof ArrayElementValueGen, "Value should be ArrayElementValueGen but is " + value);
         final ArrayElementValueGen arrayValue = (ArrayElementValueGen) value;
         assertEquals(1, arrayValue.getElementValuesSize(), "Wrong size of the array");
         final ElementValueGen innerValue = arrayValue.getElementValues().get(0);
         assertTrue(innerValue instanceof AnnotationElementValueGen, "Value in the array should be AnnotationElementValueGen but is " + innerValue);
         final AnnotationElementValueGen innerAnnotationValue = (AnnotationElementValueGen) innerValue;
         assertEquals("L" + PACKAGE_BASE_SIG + "/data/SimpleAnnotation;", innerAnnotationValue.getAnnotation().getTypeSignature(), "Wrong type signature");
 
         // check the three methods
         final Method[] methods = cgen.getMethods();
         assertEquals(3, methods.length);
         for (final Method method : methods) {
             final String methodName = method.getName();
             if (methodName.equals("<init>")) {
                 assertMethodAnnotations(method, 0, 1);
                 assertParameterAnnotations(method, 0, 1);
             } else if (methodName.equals("methodWithArrayOfZeroAnnotations")) {
                 assertMethodAnnotations(method, 1, 0);
             } else if (methodName.equals("methodWithArrayOfTwoAnnotations")) {
                 assertMethodAnnotations(method, 1, 2);
             } else {
                 fail(() -> "unexpected method " + method.getName());
             }
         }
     }
 
     /**
      * Transform simple class from an immutable to a mutable object. The class is annotated with an annotation that uses an
      * enum.
      */
     @Test
     public void testTransformClassToClassGen_EnumType() throws ClassNotFoundException {
         final JavaClass jc = getTestJavaClass(PACKAGE_BASE_NAME + ".data.AnnotatedWithEnumClass");
         final ClassGen cgen = new ClassGen(jc);
         // Check annotations are correctly preserved
         final AnnotationEntryGen[] annotations = cgen.getAnnotationEntries();
         assertEquals(1, annotations.length, "Wrong number of annotations");
     }
 
     // J5TODO: Need to add deleteFile calls to many of these tests
     /**
      * Transform simple class from an immutable to a mutable object.
      */
     @Test
     public void testTransformClassToClassGen_SimpleTypes() throws ClassNotFoundException {
         final JavaClass jc = getTestJavaClass(PACKAGE_BASE_NAME + ".data.SimpleAnnotatedClass");
         final ClassGen cgen = new ClassGen(jc);
         // Check annotations are correctly preserved
         final AnnotationEntryGen[] annotations = cgen.getAnnotationEntries();
         assertEquals(1, annotations.length, "Wrong number of annotations");
     }
 
     /**
      * Transform complex class from an immutable to a mutable object.
      */
     @Test
     public void testTransformComplexClassToClassGen() throws ClassNotFoundException {
         final JavaClass jc = getTestJavaClass(PACKAGE_BASE_NAME + ".data.ComplexAnnotatedClass");
         final ClassGen cgen = new ClassGen(jc);
         // Check annotations are correctly preserved
         final AnnotationEntryGen[] annotations = cgen.getAnnotationEntries();
         assertEquals(1, annotations.length, "Wrong number of annotations");
         final List<?> l = annotations[0].getValues();
         boolean found = false;
         for (final Object name : l) {
             final ElementValuePairGen element = (ElementValuePairGen) name;
             if (element.getNameString().equals("dval") && element.getValue().stringifyValue().equals("33.4")) {
                 found = true;
             }
         }
         assertTrue(found, "Did not find double annotation value with value 33.4");
     }
 }