org.aspectj/bcel-builder/src/test/java/org/aspectj/apache/bcel/classfile/tests/GeneratingAnnotatedClassesTest.java

/*******************************************************************************
 * Copyright (c) 2004 IBM All rights reserved. This program and the accompanying
 * materials are made available under the terms of the Eclipse Public License
 * v1.0 which accompanies this distribution and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: Andy Clement - initial implementation
 ******************************************************************************/

package org.aspectj.apache.bcel.classfile.tests;

import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.classfile.ConstantPool;
import org.aspectj.apache.bcel.classfile.JavaClass;
import org.aspectj.apache.bcel.classfile.Method;
import org.aspectj.apache.bcel.classfile.annotation.AnnotationElementValue;
import org.aspectj.apache.bcel.classfile.annotation.AnnotationGen;
import org.aspectj.apache.bcel.classfile.annotation.ArrayElementValue;
import org.aspectj.apache.bcel.classfile.annotation.ElementValue;
import org.aspectj.apache.bcel.classfile.annotation.NameValuePair;
import org.aspectj.apache.bcel.classfile.annotation.SimpleElementValue;
import org.aspectj.apache.bcel.generic.ArrayType;
import org.aspectj.apache.bcel.generic.ClassGen;
import org.aspectj.apache.bcel.generic.InstructionBranch;
import org.aspectj.apache.bcel.generic.InstructionConstants;
import org.aspectj.apache.bcel.generic.InstructionFactory;
import org.aspectj.apache.bcel.generic.InstructionHandle;
import org.aspectj.apache.bcel.generic.InstructionList;
import org.aspectj.apache.bcel.generic.LocalVariableGen;
import org.aspectj.apache.bcel.generic.MethodGen;
import org.aspectj.apache.bcel.generic.ObjectType;
import org.aspectj.apache.bcel.generic.Type;
import org.aspectj.apache.bcel.util.SyntheticRepository;

/**
 * The program that some of the tests generate looks like this: public class HelloWorld { public static void main(String[] argv) {
 * BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); String name = null; try { name = "Andy"; }
 * catch(IOException e) { return; } System.out.println("Hello, " + name); } }
 * 
 */
public class GeneratingAnnotatedClassesTest extends BcelTestCase {

	@Override
	protected void setUp() throws Exception {
		super.setUp();
	}

	/*
	 * Steps in the test: 1) Programmatically construct the HelloWorld program 2) Add two simple annotations at the class level 3)
	 * Save the class to disk 4) Reload the class using the 'static' variant of the BCEL classes 5) Check the attributes are OK
	 */
	public void testGenerateClassLevelAnnotations() throws ClassNotFoundException {

		// Create HelloWorld
		ClassGen cg = createClassGen("HelloWorld");
		ConstantPool cp = cg.getConstantPool();
		InstructionList il = new InstructionList();

		cg.addAnnotation(createSimpleVisibleAnnotation(cp));
		cg.addAnnotation(createSimpleInvisibleAnnotation(cp));

		buildClassContents(cg, cp, il);

		dumpClass(cg, "HelloWorld.class");

		JavaClass jc = getClassFrom(".", "HelloWorld");

		AnnotationGen[] as = jc.getAnnotations();
		assertTrue("Should be two annotations but found " + as.length, as.length == 2);
		AnnotationGen one = as[0];
		AnnotationGen two = as[1];
		assertTrue("Name of annotation 1 should be SimpleAnnotation but it is " + as[0].getTypeName(), as[0].getTypeName().equals(
				"SimpleAnnotation"));
		assertTrue("Name of annotation 2 should be SimpleAnnotation but it is " + as[1].getTypeName(), as[1].getTypeName().equals(
				"SimpleAnnotation"));
		List<NameValuePair> vals = as[0].getValues();
		NameValuePair nvp = vals.get(0);
		assertTrue("Name of element in SimpleAnnotation should be 'id' but it is " + nvp.getNameString(), nvp.getNameString()
				.equals("id"));
		ElementValue ev = nvp.getValue();
		assertTrue("Type of element value should be int but it is " + ev.getElementValueType(),
				ev.getElementValueType() == ElementValue.PRIMITIVE_INT);
		assertTrue("Value of element should be 4 but it is " + ev.stringifyValue(), ev.stringifyValue().equals("4"));
		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
	 */
	public void testGenerateMethodLevelAnnotations1() throws ClassNotFoundException {
		// Create HelloWorld
		ClassGen cg = createClassGen("HelloWorld");
		ConstantPool cp = cg.getConstantPool();
		InstructionList il = new InstructionList();

		buildClassContentsWithAnnotatedMethods(cg, cp, il);

		// Check annotation is OK
		int i = cg.getMethods()[0].getAnnotations().length;
		assertTrue("Prior to dumping, main method should have 1 annotation but has " + i, i == 1);

		dumpClass(cg, "temp1" + File.separator + "HelloWorld.class");

		JavaClass jc2 = getClassFrom("temp1", "HelloWorld");

		// Check annotation is OK
		i = jc2.getMethods()[0].getAnnotations().length;
		assertTrue("JavaClass should say 1 annotation on main method but says " + i, i == 1);

		ClassGen cg2 = new ClassGen(jc2);

		// Check it now it is a ClassGen
		Method[] m = cg2.getMethods();
		i = m[0].getAnnotations().length;
		assertTrue("The main 'Method' should have one annotation but has " + i, i == 1);
		MethodGen mg = new MethodGen(m[0], cg2.getClassName(), cg2.getConstantPool());

		// Check it finally when the Method is changed to a MethodGen
		i = mg.getAnnotations().size();
		assertTrue("The main 'MethodGen' should have one annotation but has " + i, i == 1);

		assertTrue(wipe("temp1" + File.separator + "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 !
	 */
	public void testGenerateMethodLevelAnnotations2() throws ClassNotFoundException {
		// Create HelloWorld
		ClassGen cg = createClassGen("HelloWorld");
		ConstantPool cp = cg.getConstantPool();
		InstructionList il = new InstructionList();

		buildClassContentsWithAnnotatedMethods(cg, cp, il);

		dumpClass(cg, "temp2", "HelloWorld.class");

		JavaClass jc2 = getClassFrom("temp2", "HelloWorld");

		ClassGen cg2 = new ClassGen(jc2);

		// Main method after reading the class back in
		Method mainMethod1 = jc2.getMethods()[0];
		assertTrue("The 'Method' should have one annotations but has " + mainMethod1.getAnnotations().length, mainMethod1
				.getAnnotations().length == 1);

		MethodGen mainMethod2 = new MethodGen(mainMethod1, cg2.getClassName(), cg2.getConstantPool());

		assertTrue("The 'MethodGen' should have one annotations but has " + mainMethod2.getAnnotations().size(), mainMethod2
				.getAnnotations().size() == 1);

		mainMethod2.addAnnotation(createFruitAnnotation(cg2.getConstantPool(), "Pear"));

		cg2.removeMethod(mainMethod1);
		cg2.addMethod(mainMethod2.getMethod());

		dumpClass(cg2, "temp3", "HelloWorld.class");

		JavaClass jc3 = getClassFrom("temp3", "HelloWorld");

		ClassGen cg3 = new ClassGen(jc3);

		Method mainMethod3 = cg3.getMethods()[1];
		int i = mainMethod3.getAnnotations().length;
		assertTrue("The 'Method' should now have two annotations but has " + i, i == 2);

		assertTrue(wipe("temp2", "HelloWorld.class"));
		assertTrue(wipe("temp3", "HelloWorld.class"));
	}

	// J5TODO: Need to add deleteFile calls to many of these tests

	/**
	 * Transform simple class from an immutable to a mutable object.
	 */
	public void testTransformClassToClassGen_SimpleTypes() throws ClassNotFoundException {
		JavaClass jc = getClassFrom("testcode.jar", "SimpleAnnotatedClass");
		ClassGen cgen = new ClassGen(jc);

		// Check annotations are correctly preserved
		AnnotationGen[] annotations = cgen.getAnnotations();
		assertTrue("Expected one annotation but found " + annotations.length, annotations.length == 1);
	}

	/**
	 * Transform simple class from an immutable to a mutable object. The class is annotated with an annotation that uses an enum.
	 */
	public void testTransformClassToClassGen_EnumType() throws ClassNotFoundException {
		JavaClass jc = getClassFrom("testcode.jar", "AnnotatedWithEnumClass");
		ClassGen cgen = new ClassGen(jc);

		// Check annotations are correctly preserved
		AnnotationGen[] annotations = cgen.getAnnotations();
		assertTrue("Expected one annotation but found " + annotations.length, annotations.length == 1);
	}

	/**
	 * Transform simple class from an immutable to a mutable object. The class is annotated with an annotation that uses an array of
	 * SimpleAnnotations.
	 */
	public void testTransformClassToClassGen_ArrayAndAnnotationTypes() throws ClassNotFoundException {
		JavaClass jc = getClassFrom("testcode.jar", "AnnotatedWithCombinedAnnotation");
		ClassGen cgen = new ClassGen(jc);

		// Check annotations are correctly preserved
		AnnotationGen[] annotations = cgen.getAnnotations();
		assertTrue("Expected one annotation but found " + annotations.length, annotations.length == 1);
		AnnotationGen a = annotations[0];
		assertTrue("That annotation should only have one value but has " + a.getValues().size(), a.getValues().size() == 1);
		NameValuePair nvp = a.getValues().get(0);
		ElementValue value = nvp.getValue();
		assertTrue("Value should be ArrayElementValueGen but is " + value, value instanceof ArrayElementValue);
		ArrayElementValue arrayValue = (ArrayElementValue) value;
		assertTrue("Array value should be size one but is " + arrayValue.getElementValuesArraySize(), arrayValue
				.getElementValuesArraySize() == 1);
		ElementValue innerValue = arrayValue.getElementValuesArray()[0];
		assertTrue("Value in the array should be AnnotationElementValueGen but is " + innerValue,
				innerValue instanceof AnnotationElementValue);
		AnnotationElementValue innerAnnotationValue = (AnnotationElementValue) innerValue;
		assertTrue("Should be called LSimpleAnnotation; but is called: " + innerAnnotationValue.getAnnotation().getTypeName(),
				innerAnnotationValue.getAnnotation().getTypeSignature().equals("LSimpleAnnotation;"));
	}

	/**
	 * Transform complex class from an immutable to a mutable object.
	 */
	public void testTransformComplexClassToClassGen() throws ClassNotFoundException {
		JavaClass jc = getClassFrom("testcode.jar", "ComplexAnnotatedClass");
		ClassGen cgen = new ClassGen(jc);

		// Check annotations are correctly preserved
		AnnotationGen[] annotations = cgen.getAnnotations();
		assertTrue("Expected one annotation but found " + annotations.length, annotations.length == 1);
		List<NameValuePair> l = annotations[0].getValues();
		boolean found = false;
		for (Iterator<NameValuePair> iter = l.iterator(); iter.hasNext();) {
			NameValuePair element = iter.next();
			if (element.getNameString().equals("dval")) {
				if (((SimpleElementValue) element.getValue()).stringifyValue().equals("33.4"))
					found = true;
			}
		}
		assertTrue("Did not find double annotation value with value 33.4", found);
	}

	/**
	 * Load a class in and modify it with a new attribute - A SimpleAnnotation annotation
	 */
	public void testModifyingClasses1() throws ClassNotFoundException {
		JavaClass jc = getClassFrom("testcode.jar", "SimpleAnnotatedClass");
		ClassGen cgen = new ClassGen(jc);
		ConstantPool cp = cgen.getConstantPool();
		cgen.addAnnotation(createFruitAnnotation(cp, "Pineapple"));
		assertTrue("Should now have two annotations but has " + cgen.getAnnotations().length, cgen.getAnnotations().length == 2);
		dumpClass(cgen, "SimpleAnnotatedClass.class");
		assertTrue(wipe("SimpleAnnotatedClass.class"));
	}

	/**
	 * Load a class in and modify it with a new attribute - A ComplexAnnotation annotation
	 */
	public void testModifyingClasses2() throws ClassNotFoundException {
		JavaClass jc = getClassFrom("testcode.jar", "SimpleAnnotatedClass");
		ClassGen cgen = new ClassGen(jc);
		ConstantPool cp = cgen.getConstantPool();
		cgen.addAnnotation(createCombinedAnnotation(cp));
		assertTrue("Should now have two annotations but has " + cgen.getAnnotations().length, cgen.getAnnotations().length == 2);
		dumpClass(cgen, "SimpleAnnotatedClass.class");
		JavaClass jc2 = getClassFrom(".", "SimpleAnnotatedClass");
		jc2.getAnnotations();
		assertTrue(wipe("SimpleAnnotatedClass.class"));
		// System.err.println(jc2.toString());
	}

	private void dumpClass(ClassGen cg, String fname) {
		try {
			File f = createTestdataFile(fname);
			cg.getJavaClass().dump(f);
		} catch (java.io.IOException e) {
			System.err.println(e);
		}
	}

	private void dumpClass(ClassGen cg, String dir, String fname) {
		dumpClass(cg, dir + File.separator + fname);
	}

	private void buildClassContentsWithAnnotatedMethods(ClassGen cg, ConstantPool cp, InstructionList il) {
		// Create method 'public static void main(String[]argv)'
		MethodGen mg = createMethodGen("main", il, cp);
		InstructionFactory factory = new InstructionFactory(cg);
		mg.addAnnotation(createSimpleVisibleAnnotation(mg.getConstantPool()));
		// We now define some often used types:

		ObjectType i_stream = new ObjectType("java.io.InputStream");
		ObjectType p_stream = 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(InstructionConstants.DUP); // Use predefined constant
		il.append(factory.createNew("java.io.InputStreamReader"));
		il.append(InstructionConstants.DUP);
		il.append(factory.createFieldAccess("java.lang.System", "in", i_stream, Constants.GETSTATIC));
		il.append(factory.createInvoke("java.io.InputStreamReader", "<init>", Type.VOID, new Type[] { i_stream },
				Constants.INVOKESPECIAL));
		il.append(factory.createInvoke("java.io.BufferedReader", "<init>", Type.VOID,
				new Type[] { new ObjectType("java.io.Reader") }, Constants.INVOKESPECIAL));

		LocalVariableGen lg = mg.addLocalVariable("in", new ObjectType("java.io.BufferedReader"), null, null);
		int in = lg.getIndex();
		lg.setStart(il.append(InstructionFactory.createASTORE(in))); // "in" valid from here

		// Create local variable name and initialize it to null

		lg = mg.addLocalVariable("name", Type.STRING, null, null);
		int name = lg.getIndex();
		il.append(InstructionConstants.ACONST_NULL);
		lg.setStart(il.append(InstructionFactory.createASTORE(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));
		InstructionHandle try_start = il.append(InstructionFactory.PUSH(cp, "Andy"));
		il.append(InstructionFactory.createASTORE(name));

		// Upon normal execution we jump behind exception handler, the target
		// address is not known yet.

		InstructionBranch g = new InstructionBranch(Constants.GOTO);
		InstructionHandle try_end = il.append(g);

		// We add the exception handler which simply returns from the method.

		LocalVariableGen var_ex = mg.addLocalVariable("ex", Type.getType("Ljava.io.IOException;"), null, null);
		int var_ex_slot = var_ex.getIndex();

		InstructionHandle handler = il.append(InstructionFactory.createASTORE(var_ex_slot));
		var_ex.setStart(handler);
		var_ex.setEnd(il.append(InstructionConstants.RETURN));

		mg.addExceptionHandler(try_start, try_end, handler, new ObjectType("java.io.IOException"));

		// "Normal" code continues, now we can set the branch target of the GOTO
		// .

		InstructionHandle ih = il.append(factory.createFieldAccess("java.lang.System", "out", p_stream, Constants.GETSTATIC));
		g.setTarget(ih);

		// Printing "Hello": String concatenation compiles to StringBuffer
		// operations.

		il.append(factory.createNew(Type.STRINGBUFFER));
		il.append(InstructionConstants.DUP);
		il.append(InstructionFactory.PUSH(cp, "Hello, "));
		il.append(factory.createInvoke("java.lang.StringBuffer", "<init>", Type.VOID, new Type[] { Type.STRING },
				Constants.INVOKESPECIAL));
		il.append(InstructionFactory.createALOAD(name));
		il.append(factory.createInvoke("java.lang.StringBuffer", "append", Type.STRINGBUFFER, new Type[] { Type.STRING },
				Constants.INVOKEVIRTUAL));
		il.append(factory.createInvoke("java.lang.StringBuffer", "toString", Type.STRING, Type.NO_ARGS, Constants.INVOKEVIRTUAL));

		il.append(factory.createInvoke("java.io.PrintStream", "println", Type.VOID, new Type[] { Type.STRING },
				Constants.INVOKEVIRTUAL));
		il.append(InstructionConstants.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(Constants.ACC_PUBLIC);
	}

	private void buildClassContents(ClassGen cg, ConstantPool cp, InstructionList il) {
		// Create method 'public static void main(String[]argv)'
		MethodGen mg = createMethodGen("main", il, cp);
		InstructionFactory factory = new InstructionFactory(cg);
		// We now define some often used types:

		ObjectType i_stream = new ObjectType("java.io.InputStream");
		ObjectType p_stream = 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(InstructionConstants.DUP); // Use predefined constant
		il.append(factory.createNew("java.io.InputStreamReader"));
		il.append(InstructionConstants.DUP);
		il.append(factory.createFieldAccess("java.lang.System", "in", i_stream, Constants.GETSTATIC));
		il.append(factory.createInvoke("java.io.InputStreamReader", "<init>", Type.VOID, new Type[] { i_stream },
				Constants.INVOKESPECIAL));
		il.append(factory.createInvoke("java.io.BufferedReader", "<init>", Type.VOID,
				new Type[] { new ObjectType("java.io.Reader") }, Constants.INVOKESPECIAL));

		LocalVariableGen lg = mg.addLocalVariable("in", new ObjectType("java.io.BufferedReader"), null, null);
		int in = lg.getIndex();
		lg.setStart(il.append(InstructionFactory.createASTORE(in))); // "in" valid from here

		// Create local variable name and initialize it to null

		lg = mg.addLocalVariable("name", Type.STRING, null, null);
		int name = lg.getIndex();
		il.append(InstructionConstants.ACONST_NULL);
		lg.setStart(il.append(InstructionFactory.createASTORE(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));
		InstructionHandle try_start = il.append(InstructionFactory.PUSH(cp, "Andy"));
		il.append(InstructionFactory.createASTORE(name));

		// Upon normal execution we jump behind exception handler, the target
		// address is not known yet.

		InstructionBranch g = new InstructionBranch(Constants.GOTO);
		InstructionHandle try_end = il.append(g);

		// We add the exception handler which simply returns from the method.

		LocalVariableGen var_ex = mg.addLocalVariable("ex", Type.getType("Ljava.io.IOException;"), null, null);
		int var_ex_slot = var_ex.getIndex();

		InstructionHandle handler = il.append(InstructionFactory.createASTORE(var_ex_slot));
		var_ex.setStart(handler);
		var_ex.setEnd(il.append(InstructionConstants.RETURN));

		mg.addExceptionHandler(try_start, try_end, handler, new ObjectType("java.io.IOException"));

		// "Normal" code continues, now we can set the branch target of the GOTO
		// .

		InstructionHandle ih = il.append(factory.createFieldAccess("java.lang.System", "out", p_stream, Constants.GETSTATIC));
		g.setTarget(ih);

		// Printing "Hello": String concatenation compiles to StringBuffer
		// operations.

		il.append(factory.createNew(Type.STRINGBUFFER));
		il.append(InstructionConstants.DUP);
		il.append(InstructionFactory.PUSH(cp, "Hello, "));
		il.append(factory.createInvoke("java.lang.StringBuffer", "<init>", Type.VOID, new Type[] { Type.STRING },
				Constants.INVOKESPECIAL));
		il.append(InstructionFactory.createALOAD(name));
		il.append(factory.createInvoke("java.lang.StringBuffer", "append", Type.STRINGBUFFER, new Type[] { Type.STRING },
				Constants.INVOKEVIRTUAL));
		il.append(factory.createInvoke("java.lang.StringBuffer", "toString", Type.STRING, Type.NO_ARGS, Constants.INVOKEVIRTUAL));

		il.append(factory.createInvoke("java.io.PrintStream", "println", Type.VOID, new Type[] { Type.STRING },
				Constants.INVOKEVIRTUAL));
		il.append(InstructionConstants.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(Constants.ACC_PUBLIC);
	}

	private JavaClass getClassFrom(String where, String clazzname) throws ClassNotFoundException {
		SyntheticRepository repos = createRepos(where);
		return repos.loadClass(clazzname);
	}

	// helper methods

	private ClassGen createClassGen(String classname) {
		return new ClassGen(classname, "java.lang.Object", "<generated>", Constants.ACC_PUBLIC | Constants.ACC_SUPER, null);
	}

	private MethodGen createMethodGen(String methodname, InstructionList il, ConstantPool cp) {
		return new MethodGen(Constants.ACC_STATIC | Constants.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 AnnotationGen createSimpleVisibleAnnotation(ConstantPool cp) {
		SimpleElementValue evg = new SimpleElementValue(ElementValue.PRIMITIVE_INT, cp, 4);

		NameValuePair nvGen = new NameValuePair("id", evg, cp);

		ObjectType t = new ObjectType("SimpleAnnotation");

		List<NameValuePair> elements = new ArrayList<NameValuePair>();
		elements.add(nvGen);

		AnnotationGen a = new AnnotationGen(t, elements, true, cp);
		return a;
	}

	public AnnotationGen createFruitAnnotation(ConstantPool cp, String aFruit) {
		SimpleElementValue evg = new SimpleElementValue(ElementValue.STRING, cp, aFruit);
		NameValuePair nvGen = new NameValuePair("fruit", evg, cp);
		ObjectType t = new ObjectType("SimpleStringAnnotation");
		List<NameValuePair> elements = new ArrayList<NameValuePair>();
		elements.add(nvGen);
		return new AnnotationGen(t, elements, true, cp);
	}

	public AnnotationGen createCombinedAnnotation(ConstantPool cp) {
		// Create an annotation instance
		AnnotationGen a = createSimpleVisibleAnnotation(cp);
		ArrayElementValue array = new ArrayElementValue(cp);
		array.addElement(new AnnotationElementValue(a, cp));
		NameValuePair nvp = new NameValuePair("value", array, cp);
		List<NameValuePair> elements = new ArrayList<NameValuePair>();
		elements.add(nvp);
		return new AnnotationGen(new ObjectType("CombinedAnnotation"), elements, true, cp);
	}

	public AnnotationGen createSimpleInvisibleAnnotation(ConstantPool cp) {
		SimpleElementValue evg = new SimpleElementValue(ElementValue.PRIMITIVE_INT, cp, 4);

		NameValuePair nvGen = new NameValuePair("id", evg, cp);

		ObjectType t = new ObjectType("SimpleAnnotation");

		List<NameValuePair> elements = new ArrayList<NameValuePair>();
		elements.add(nvGen);

		AnnotationGen a = new AnnotationGen(t, elements, false, cp);
		return a;
	}

	protected void tearDown() throws Exception {
		super.tearDown();
	}

}