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Open source project to apply coding conventions. This is the core component
/*
Copyright (C) 2013 Raquel Pau and Albert Coroleu.
Walkmod is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Walkmod is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with Walkmod. If not, see > primitiveClasses = new HashMap>();
private static Map wrapperClasses = new HashMap();
private static Map matrixTypePosition;
private static boolean[][] compatibilityMatrix;
private static Set langPackageContent;
static {
primitiveClasses.put("boolean", boolean.class);
primitiveClasses.put("int", int.class);
primitiveClasses.put("long", long.class);
primitiveClasses.put("double", double.class);
primitiveClasses.put("char", char.class);
primitiveClasses.put("float", float.class);
primitiveClasses.put("short", short.class);
primitiveClasses.put("byte", byte.class);
matrixTypePosition = new HashMap();
matrixTypePosition.put("byte", 0);
matrixTypePosition.put("java.lang.Byte", 0);
matrixTypePosition.put("short", 1);
matrixTypePosition.put("char", 2);
matrixTypePosition.put("java.lang.Character", 2);
matrixTypePosition.put("int", 3);
matrixTypePosition.put("java.lang.Integer", 3);
matrixTypePosition.put("long", 4);
matrixTypePosition.put("java.lang.Long", 4);
matrixTypePosition.put("float", 5);
matrixTypePosition.put("java.lang.Float", 5);
matrixTypePosition.put("double", 6);
matrixTypePosition.put("java.lang.Double", 6);
matrixTypePosition.put("boolean", 7);
matrixTypePosition.put("java.lang.Boolean", 7);
matrixTypePosition.put("String", 8);
matrixTypePosition.put("java.lang.String", 8);
matrixTypePosition.put("java.lang.Object", 9);
wrapperClasses.put("java.lang.Byte", "byte");
wrapperClasses.put("java.lang.Character", "char");
wrapperClasses.put("java.lang.Integer", "int");
wrapperClasses.put("java.lang.Long", "long");
wrapperClasses.put("java.lang.Float", "float");
wrapperClasses.put("java.lang.Double", "double");
wrapperClasses.put("java.lang.Boolean", "boolean");
compatibilityMatrix = new boolean[][] { { true, true, true, true, true, true, true, false, false, true },
{ false, true, false, true, true, true, true, false, false, true },
{ false, false, true, true, true, true, true, false, false, true },
{ false, false, false, true, true, true, true, false, false, true },
{ false, false, false, false, true, true, true, false, false, true },
{ false, false, false, false, false, true, true, false, false, true },
{ false, false, false, false, false, false, true, false, false, true },
{ false, false, false, false, false, false, false, true, false, true },
{ false, false, false, false, false, false, false, false, true, true },
{ false, false, false, false, false, false, false, false, false, true } };
langPackageContent = new HashSet();
langPackageContent.add("Appendable");
langPackageContent.add("CharSequence");
langPackageContent.add("Cloneable");
langPackageContent.add("Comparable");
langPackageContent.add("Iterable");
langPackageContent.add("Readable");
langPackageContent.add("Runnable");
langPackageContent.add("Thread$UncaughtExceptionHandler");
langPackageContent.add("Boolean");
langPackageContent.add("Byte");
langPackageContent.add("Character");
langPackageContent.add("Character$Subset");
langPackageContent.add("Character$UnicodeBlock");
langPackageContent.add("Class");
langPackageContent.add("ClassLoader");
langPackageContent.add("Compiler");
langPackageContent.add("Double");
langPackageContent.add("Enum");
langPackageContent.add("Float");
langPackageContent.add("InheritableThreadLocal");
langPackageContent.add("Integer");
langPackageContent.add("Long");
langPackageContent.add("Math");
langPackageContent.add("Number");
langPackageContent.add("Object");
langPackageContent.add("Package");
langPackageContent.add("Process");
langPackageContent.add("ProcessBuilder");
langPackageContent.add("Runtime");
langPackageContent.add("RuntimePermission");
langPackageContent.add("SecurityManager");
langPackageContent.add("Short");
langPackageContent.add("StackTraceElement");
langPackageContent.add("StrictMath");
langPackageContent.add("String");
langPackageContent.add("StringBuffer");
langPackageContent.add("StringBuilder");
langPackageContent.add("System");
langPackageContent.add("Thread");
langPackageContent.add("ThreadGroup");
langPackageContent.add("ThreadLocal");
langPackageContent.add("Throwable");
langPackageContent.add("Void");
langPackageContent.add("Thread$State");
langPackageContent.add("ArithmeticException");
langPackageContent.add("ArrayIndexOutOfBoundsException");
langPackageContent.add("ArrayStoreException");
langPackageContent.add("ClassCastException");
langPackageContent.add("ClassNotFoundException");
langPackageContent.add("CloneNotSupportedException");
langPackageContent.add("EnumConstantNotPresentException");
langPackageContent.add("Exception");
langPackageContent.add("IllegalAccessException");
langPackageContent.add("IllegalArgumentException");
langPackageContent.add("IllegalMonitorStateException");
langPackageContent.add("IllegalStateException");
langPackageContent.add("IllegalThreadStateException");
langPackageContent.add("IndexOutOfBoundsException");
langPackageContent.add("InstantiationException");
langPackageContent.add("InterruptedException");
langPackageContent.add("NegativeArraySizeException");
langPackageContent.add("NoSuchFieldException");
langPackageContent.add("NoSuchMethodException");
langPackageContent.add("NullPointerException");
langPackageContent.add("NumberFormatException");
langPackageContent.add("RuntimeException");
langPackageContent.add("SecurityException");
langPackageContent.add("StringIndexOutOfBoundsException");
langPackageContent.add("TypeNotPresentException");
langPackageContent.add("UnsupportedOperationException");
langPackageContent.add("AbstractMethodError");
langPackageContent.add("AssertionError");
langPackageContent.add("ClassCircularityError");
langPackageContent.add("ClassFormatError");
langPackageContent.add("Error");
langPackageContent.add("ExceptionInInitializerError");
langPackageContent.add("IllegalAccessError");
langPackageContent.add("IncompatibleClassChangeError");
langPackageContent.add("InstatiationError");
langPackageContent.add("InternalError");
langPackageContent.add("LinkageError");
langPackageContent.add("NoClassDefFoundError");
langPackageContent.add("NoSuchFieldError");
langPackageContent.add("NoSuchMethodError");
langPackageContent.add("OutOfMemoryError");
langPackageContent.add("StackOverflowError");
langPackageContent.add("ThreadDeath");
langPackageContent.add("UnknownError");
langPackageContent.add("UnsatistiedLinkError");
langPackageContent.add("UnsupportedClassVersionError");
langPackageContent.add("VerifyError");
langPackageContent.add("VirtualMachineError");
langPackageContent.add("Deprecated");
langPackageContent.add("Override");
langPackageContent.add("SuppressWarnings");
}
public static boolean belongsToLangPackage(String clazz) {
return langPackageContent.contains(clazz);
}
public static boolean isCompatible(Class fromClass, Class toClass) {
if (fromClass == null || toClass == null) {
return true;
}
if (matrixTypePosition.containsKey(fromClass.getName()) && matrixTypePosition.containsKey(toClass.getName())) {
return compatibilityMatrix[matrixTypePosition.get(fromClass.getName())][matrixTypePosition.get(toClass
.getName())];
} else {
return toClass.isAssignableFrom(fromClass);
}
}
public static boolean isPrimitiveWrapperClass(Class clazz) {
return wrapperClasses.containsKey(clazz.getName());
}
public static Class getPrimitiveClass(Class wrapperClazz) {
if (isPrimitiveWrapperClass(wrapperClazz)) {
return getPrimitiveClass(wrapperClasses.get(wrapperClazz.getName()));
}
return null;
}
public static Class getPrimitiveClass(String name) {
return primitiveClasses.get(name);
}
public static boolean isCompatible(Class[] fromClasses, Class[] toClasses) {
if (fromClasses.length == toClasses.length) {
boolean assignable = true;
for (int i = 0; i < fromClasses.length && assignable; i++) {
assignable = isCompatible(fromClasses[i], toClasses[i]);
}
return assignable;
}
return false;
}
/**
* This method returns a method(public, protected or private) which appears
* in the selected class or any of its parent (interface or superclass) or
* container classes (when the selected class is an inner class) which
* matches with the name and whose parameters are compatible with the
* selected typeArgs.
*
* @param clazz
* Class to scan
* @param methodName
* Method name
* @param typeArgs
* Method arguments
* @return Method instance
*/
public Method getMethod(Class clazz, String methodName, Class... typeArgs) {
int numParams = typeArgs == null ? 0 : typeArgs.length;
Method[] classMethods = clazz.getMethods();
for (Method method : classMethods) {
if (method.getName().equals(methodName)) {
if (method.getParameterTypes().length == numParams) {
boolean isCompatible = true;
Class[] methodParameterTypes = method.getParameterTypes();
for (int i = 0; i < methodParameterTypes.length; i++) {
isCompatible = isCompatible(typeArgs[i], methodParameterTypes[i]);
if (!isCompatible)
break;
}
if (isCompatible) {
return method;
}
}
}
}
classMethods = clazz.getDeclaredMethods();
for (Method method : classMethods) {
if (method.getName().equals(methodName)) {
if (method.getParameterTypes().length == numParams) {
boolean isCompatible = true;
Class[] methodParameterTypes = method.getParameterTypes();
for (int i = 0; i < methodParameterTypes.length; i++) {
isCompatible = isCompatible(typeArgs[i], methodParameterTypes[i]);
if (!isCompatible)
break;
}
if (isCompatible) {
return method;
}
}
}
}
Method result = null;
if (clazz.isMemberClass()) {
result = getMethod(clazz.getEnclosingClass(), methodName, typeArgs);
}
if (result == null && clazz.getSuperclass() != null) {
return getMethod(clazz.getSuperclass(), methodName, typeArgs);
}
return result;
}
/**
* Load all resources with a given name, potentially aggregating all results
* from the searched classloaders. If no results are found, the resource
* name is prepended by '/' and tried again.
*
* This method will try to load the resources using the following methods
* (in order):
*
* - From Thread.currentThread().getContextClassLoader()
*
- From ClassLoaderUtil.class.getClassLoader()
*
- callingClass.getClassLoader()
*
*
* @param resourceName
* The name of the resources to load
* @param callingClass
* The Class object of the calling object
* @param aggregate
* true to aggregate resources from all classloaders
* @return Iterator of matching resources
* @throws IOException
* If I/O errors occur
*/
public static Iterator getResources(String resourceName, Class callingClass, boolean aggregate)
throws IOException {
AggregateIterator iterator = new AggregateIterator();
iterator.addEnumeration(Thread.currentThread().getContextClassLoader().getResources(resourceName));
if (!iterator.hasNext() || aggregate) {
iterator.addEnumeration(ClassLoaderUtil.class.getClassLoader().getResources(resourceName));
}
if (!iterator.hasNext() || aggregate) {
ClassLoader cl = callingClass.getClassLoader();
if (cl != null) {
iterator.addEnumeration(cl.getResources(resourceName));
}
}
if (!iterator.hasNext() && (resourceName != null)
&& ((resourceName.length() == 0) || (resourceName.charAt(0) != '/'))) {
return getResources('/' + resourceName, callingClass, aggregate);
}
return iterator;
}
/**
* Load a given resource.
*
* This method will try to load the resource using the following methods (in
* order):
*
* - From Thread.currentThread().getContextClassLoader()
*
- From ClassLoaderUtil.class.getClassLoader()
*
- callingClass.getClassLoader()
*
*
* @param resourceName
* The name IllegalStateException("Unable to call ")of the
* resource to load
* @param callingClass
* The Class object of the calling object
* @return Matching resouce or null if not found
*/
public static URL getResource(String resourceName, Class callingClass) {
URL url = Thread.currentThread().getContextClassLoader().getResource(resourceName);
if (url == null) {
url = ClassLoaderUtil.class.getClassLoader().getResource(resourceName);
}
if (url == null) {
ClassLoader cl = callingClass.getClassLoader();
if (cl != null) {
url = cl.getResource(resourceName);
}
}
if ((url == null) && (resourceName != null)
&& ((resourceName.length() == 0) || (resourceName.charAt(0) != '/'))) {
return getResource('/' + resourceName, callingClass);
}
return url;
}
/**
* This is a convenience method to load a resource as a stream.
*
* The algorithm used to find the resource is given in getResource()
*
* @param resourceName
* The name of the resource to load
* @param callingClass
* The Class object of the calling object
* @return Matching resouce or null if not found
*/
public static InputStream getResourceAsStream(String resourceName, Class callingClass) {
URL url = getResource(resourceName, callingClass);
try {
return (url != null) ? url.openStream() : null;
} catch (IOException e) {
return null;
}
}
/**
* Load a class with a given name.
*
* It will try to load the class in the following order:
*
* - From Thread.currentThread().getContextClassLoader()
*
- Using the basic Class.forName()
*
- From ClassLoaderUtil.class.getClassLoader()
*
- From the callingClass.getClassLoader()
*
*
* @param className
* The name of the class to load
* @param callingClass
* The Class object of the calling object
* @return Class definition
* @throws ClassNotFoundException
* If the class cannot be found anywhere.
*/
public static Class loadClass(String className, Class callingClass) throws ClassNotFoundException {
try {
return Thread.currentThread().getContextClassLoader().loadClass(className);
} catch (ClassNotFoundException e) {
try {
return Class.forName(className);
} catch (ClassNotFoundException ex) {
try {
return ClassLoaderUtil.class.getClassLoader().loadClass(className);
} catch (ClassNotFoundException exc) {
return callingClass.getClassLoader().loadClass(className);
}
}
}
}
/**
* Aggregates Enumeration instances into one iterator and filters out
* duplicates. Always keeps one ahead of the enumerator to protect against
* returning duplicates.
*/
protected static class AggregateIterator implements Iterator {
LinkedList> enums = new LinkedList>();
Enumeration cur = null;
E next = null;
Set loaded = new HashSet();
public AggregateIterator addEnumeration(Enumeration e) {
if (e.hasMoreElements()) {
if (cur == null) {
cur = e;
next = e.nextElement();
loaded.add(next);
} else {
enums.add(e);
}
}
return this;
}
public boolean hasNext() {
return (next != null);
}
public E next() {
if (next != null) {
E prev = next;
next = loadNext();
return prev;
} else {
throw new NoSuchElementException();
}
}
private Enumeration determineCurrentEnumeration() {
if (cur != null && !cur.hasMoreElements()) {
if (enums.size() > 0) {
cur = enums.removeLast();
} else {
cur = null;
}
}
return cur;
}
private E loadNext() {
if (determineCurrentEnumeration() != null) {
E tmp = cur.nextElement();
while (loaded.contains(tmp)) {
tmp = loadNext();
if (tmp == null) {
break;
}
}
if (tmp != null) {
loaded.add(tmp);
}
return tmp;
}
return null;
}
public void remove() {
throw new UnsupportedOperationException();
}
}
}