@Override
public void processField(CtField field) throws Exception {
if (!field.getName().equals("Id")) {
CtMethod ctMethod = checkSetMethodNull(field);
ctMethod.insertAfter("this.modify();");
}
}
private void changeMethod(CtClass ctClass, CtMethod ctMethod) throws CannotCompileException {
// basically your before-advice...
ctMethod.insertBefore("System.out.println(\"started method at \" + new java.util.Date());");
// basically your after-advice...
ctMethod.insertAfter("System.out.println(\"ended method at \" + new java.util.Date());");
// basically your around-advice...
String methodName = ctMethod.getName();
String proxyName = methodName + "_$proxy";
CtMethod proxy = CtNewMethod.copy(ctMethod, proxyName, ctClass, null);
ctMethod.setName(ctMethod.getName() + "_orig");
proxy.setBody(
"{ System.out.println(\"hoot!\"); return $proceed($$);}", "this", ctMethod.getName());
proxy.setName(methodName);
ctClass.addMethod(proxy);
}
private void handleCompositeField(
CtClass managedCtClass, CtField persistentField, CtMethod fieldWriter)
throws NotFoundException, CannotCompileException {
if (!persistentField.hasAnnotation(Embedded.class)) {
return;
}
// make sure to add the CompositeOwner interface
managedCtClass.addInterface(classPool.get(CompositeOwner.class.getName()));
if (enhancementContext.isCompositeClass(managedCtClass)) {
// if a composite have a embedded field we need to implement the TRACKER_CHANGER_NAME method
// as well
MethodWriter.write(
managedCtClass,
""
+ "public void %1$s(String name) {%n"
+ " if (%2$s != null) { %2$s.callOwner(\".\" + name) ; }%n}",
EnhancerConstants.TRACKER_CHANGER_NAME,
EnhancerConstants.TRACKER_COMPOSITE_FIELD_NAME);
}
// cleanup previous owner
fieldWriter.insertBefore(
String.format(
"" + "if (%1$s != null) { ((%2$s) %1$s).%3$s(\"%1$s\"); }%n",
persistentField.getName(),
CompositeTracker.class.getName(),
EnhancerConstants.TRACKER_COMPOSITE_CLEAR_OWNER));
// trigger track changes
fieldWriter.insertAfter(
String.format(
"" + "((%2$s) %1$s).%4$s(\"%1$s\", (%3$s) this);%n" + "%5$s(\"%1$s\");",
persistentField.getName(),
CompositeTracker.class.getName(),
CompositeOwner.class.getName(),
EnhancerConstants.TRACKER_COMPOSITE_SET_OWNER,
EnhancerConstants.TRACKER_CHANGER_NAME));
}
private static void insertAfter(CtMethod m, String newBody) throws Exception {
removeNativeModifier(m);
m.insertAfter(newBody);
}
@Override
public byte[] transform(
ClassLoader loader,
String className,
Class<?> classBeingRedefined,
ProtectionDomain protectionDomain,
byte[] classfileBuffer)
throws IllegalClassFormatException {
// Don't transform system classes. This reason is:
// - To improve performance
// - To avoid unexpected behaviors.
// For example, if transforms java.lang.invoke.** classes in Java8
// even without any ctClass modification, the classes become broken
// and Java stream API call fails unexpectedly.
// Maybe this is because CtClass instance generated by ClassPool.makeClass method
// is cached on global default ClassPool instance.
if (isJavaSystemClassName(className)) {
return null;
}
// TODO don't need to do anything for java package classes
ClassPool classPool = ClassPool.getDefault();
String hookClassName = HookMethodDef.class.getCanonicalName();
String initializeSrc = hookInitializeSrc();
boolean transformed = false;
InputStream stream = null;
try {
stream = new ByteArrayInputStream(classfileBuffer);
CtClass ctClass = null;
try {
ctClass = classPool.makeClass(stream, true);
} catch (RuntimeException e) {
// makeClass raises RuntimeException when the existing class is frozen.
// Since frozen classes are maybe system class, just ignore this exception
return null;
}
for (Pair<CtMethod, TestMethod> pair : allSubMethods(srcTree, ctClass)) {
CtMethod ctSubMethod = pair.getLeft();
TestMethod subMethod = pair.getRight();
if (ctSubMethod.isEmpty()) {
logger.info("skip empty method: " + ctSubMethod.getLongName());
continue; // cannot hook empty method
}
String subClassQualifiedName = subMethod.getTestClass().getQualifiedName();
String subMethodSimpleName = subMethod.getSimpleName();
String subMethodArgClassesStr =
TestMethod.argClassQualifiedNamesToArgClassesStr(
getArgClassQualifiedNames(ctSubMethod));
for (int i = 0; i < subMethod.getCodeBody().size(); i++) {
CodeLine codeLine = subMethod.getCodeBody().get(i);
if (i + 1 < subMethod.getCodeBody().size()) {
CodeLine nextCodeLine = subMethod.getCodeBody().get(i + 1);
assert codeLine.getEndLine() <= nextCodeLine.getStartLine();
if (codeLine.getEndLine() == nextCodeLine.getStartLine()) {
// - if multiple statements exist on a line, insert hook only after the last statement
// - avoid insertion at the middle of the statement.
// The problem happens when multi-line statements are like:
// method(1);method(
// 2);
continue;
}
}
// Hook should be inserted just after the code has finished
// since the code inserted by the insertAt method is inserted just before the specified
// line.
int insertedLine = subMethod.getCodeBody().get(i).getEndLine() + 1;
int actualInsertedLine = ctSubMethod.insertAt(insertedLine, false, null);
ctSubMethod.insertAt(
insertedLine,
String.format(
"%s%s.beforeCodeLineHook(\"%s\",\"%s\",\"%s\",\"%s\",%d, %d);",
initializeSrc,
hookClassName,
subClassQualifiedName,
subMethodSimpleName,
subMethodSimpleName,
subMethodArgClassesStr,
codeLine.getStartLine(),
actualInsertedLine));
transformed = true;
}
}
CtClass exceptionType = classPool.get(Throwable.class.getCanonicalName());
for (Pair<CtMethod, TestMethod> pair : allRootMethods(srcTree, ctClass)) {
CtMethod ctRootMethod = pair.getLeft();
TestMethod rootMethod = pair.getRight();
if (ctRootMethod.isEmpty()) {
continue; // cannot hook empty method
}
String rootClassQualifiedName = rootMethod.getTestClass().getQualifiedName();
String rootMethodSimpleName = rootMethod.getSimpleName();
String rootMethodArgClassesStr =
TestMethod.argClassQualifiedNamesToArgClassesStr(
getArgClassQualifiedNames(ctRootMethod));
for (int i = 0; i < rootMethod.getCodeBody().size(); i++) {
CodeLine codeLine = rootMethod.getCodeBody().get(i);
if (i + 1 < rootMethod.getCodeBody().size()) {
CodeLine nextCodeLine = rootMethod.getCodeBody().get(i + 1);
assert codeLine.getEndLine() <= nextCodeLine.getStartLine();
if (codeLine.getEndLine() == nextCodeLine.getStartLine()) {
// - if multiple statements exist on a line, insert hook only after the last statement
// - avoid insertion at the middle of the statement.
// The problem happens when multi-line statements are like:
// method(1);method(
// 2);
continue;
// TODO screen capture is not taken correctly for multiple statements in a line
}
}
// Hook should be inserted just after the code has finished
// since the code inserted by the insertAt method is inserted just before the specified
// line.
int insertedLine = rootMethod.getCodeBody().get(i).getEndLine() + 1;
int actualInsertedLine = ctRootMethod.insertAt(insertedLine, false, null);
ctRootMethod.insertAt(
insertedLine,
String.format(
"%s%s.beforeCodeLineHook(\"%s\",\"%s\",\"%s\",\"%s\",%d,%d);",
initializeSrc,
hookClassName,
rootClassQualifiedName,
rootMethodSimpleName,
rootMethodSimpleName,
rootMethodArgClassesStr,
codeLine.getStartLine(),
actualInsertedLine));
}
ctRootMethod.insertBefore(
String.format(
"%s%s.beforeMethodHook(\"%s\",\"%s\",\"%s\");",
initializeSrc,
hookClassName,
rootClassQualifiedName,
rootMethodSimpleName,
rootMethodSimpleName));
ctRootMethod.addCatch(
String.format(
"{ %s%s.methodErrorHook(\"%s\",\"%s\",$e); throw $e; }",
initializeSrc, hookClassName, rootClassQualifiedName, rootMethodSimpleName),
exceptionType);
ctRootMethod.insertAfter(
String.format(
"%s%s.afterMethodHook(\"%s\",\"%s\");",
initializeSrc, hookClassName, rootClassQualifiedName, rootMethodSimpleName),
true);
transformed = true;
}
// don't transform not changed ctClass
// (to improve performance and avoid unexpected error)
if (transformed) {
logger.info("transform " + className);
return ctClass.toBytecode();
} else {
return null;
}
} catch (CannotCompileException e) {
// print error since exception in transform method is just ignored
System.err.println("exception on " + className);
e.printStackTrace();
throw new IllegalClassFormatException(e.getLocalizedMessage());
} catch (Exception e) {
// print error since exception in transform method is just ignored
System.err.println("exception on " + className);
e.printStackTrace();
throw new RuntimeException(e);
} finally {
IOUtils.closeQuietly(stream);
}
}
private void handleBiDirectionalAssociation(
CtClass managedCtClass, CtField persistentField, CtMethod fieldWriter)
throws NotFoundException, CannotCompileException {
if (!isPossibleBiDirectionalAssociation(persistentField)) {
return;
}
final CtClass targetEntity = getTargetEntityClass(persistentField);
if (targetEntity == null) {
log.debugf(
"Could not find type of bi-directional association for field [%s#%s]",
managedCtClass.getName(), persistentField.getName());
return;
}
final String mappedBy = getMappedBy(persistentField, targetEntity);
if (mappedBy.isEmpty()) {
log.warnf(
"Could not find bi-directional association for field [%s#%s]",
managedCtClass.getName(), persistentField.getName());
return;
}
// create a temporary getter and setter on the target entity to be able to compile our code
final String mappedByGetterName = EnhancerConstants.PERSISTENT_FIELD_READER_PREFIX + mappedBy;
final String mappedBySetterName = EnhancerConstants.PERSISTENT_FIELD_WRITER_PREFIX + mappedBy;
MethodWriter.addGetter(targetEntity, mappedBy, mappedByGetterName);
MethodWriter.addSetter(targetEntity, mappedBy, mappedBySetterName);
if (persistentField.hasAnnotation(OneToOne.class)) {
// only unset when $1 != null to avoid recursion
fieldWriter.insertBefore(
String.format(
"if ($0.%s != null && $1 != null) $0.%<s.%s(null);%n",
persistentField.getName(), mappedBySetterName));
fieldWriter.insertAfter(
String.format(
"if ($1 != null && $1.%s() != $0) $1.%s($0);%n",
mappedByGetterName, mappedBySetterName));
}
if (persistentField.hasAnnotation(OneToMany.class)) {
// only remove elements not in the new collection or else we would loose those elements
// don't use iterator to avoid ConcurrentModException
fieldWriter.insertBefore(
String.format(
"if ($0.%s != null) { Object[] array = $0.%<s.toArray(); for (int i = 0; i < array.length; i++) { %s target = (%<s) array[i]; if ($1 == null || !$1.contains(target)) target.%s(null); } }%n",
persistentField.getName(), targetEntity.getName(), mappedBySetterName));
fieldWriter.insertAfter(
String.format(
"if ($1 != null) { Object[] array = $1.toArray(); for (int i = 0; i < array.length; i++) { %s target = (%<s) array[i]; if (target.%s() != $0) target.%s((%s)$0); } }%n",
targetEntity.getName(),
mappedByGetterName,
mappedBySetterName,
managedCtClass.getName()));
}
if (persistentField.hasAnnotation(ManyToOne.class)) {
fieldWriter.insertBefore(
String.format(
"if ($0.%1$s != null && $0.%1$s.%2$s() != null) $0.%1$s.%2$s().remove($0);%n",
persistentField.getName(), mappedByGetterName));
// check .contains($0) to avoid double inserts (but preventing duplicates)
fieldWriter.insertAfter(
String.format(
"if ($1 != null) { java.util.Collection c = $1.%s(); if (c != null && !c.contains($0)) c.add($0); }%n",
mappedByGetterName));
}
if (persistentField.hasAnnotation(ManyToMany.class)) {
fieldWriter.insertBefore(
String.format(
"if ($0.%s != null) { Object[] array = $0.%<s.toArray(); for (int i = 0; i < array.length; i++) { %s target = (%<s) array[i]; if ($1 == null || !$1.contains(target)) target.%s().remove($0); } }%n",
persistentField.getName(), targetEntity.getName(), mappedByGetterName));
fieldWriter.insertAfter(
String.format(
"if ($1 != null) { Object[] array = $1.toArray(); for (int i = 0; i < array.length; i++) { %s target = (%<s) array[i]; java.util.Collection c = target.%s(); if ( c != $0 && c != null) c.add($0); } }%n",
targetEntity.getName(), mappedByGetterName));
}
// implementation note: association management @OneToMany and @ManyToMay works for add()
// operations but for remove() a snapshot of the collection is needed so we know what
// associations to break.
// another approach that could force that behavior would be to return
// Collections.unmodifiableCollection() ...
}
