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/*
* Copyright 2008 biaoping.yin
*
* Licensed 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.frameworkset.util;
import java.beans.Introspector;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Proxy;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
*
* Title: ClassUtils.java
*
*
* Description:
*
*
* bboss workgroup
*
*
* Copyright (c) 2008
*
*
* @Date 2010-9-24
* @author biaoping.yin
* @version 1.0
*/
public class ClassUtils
{
/** Suffix for array class names: "[]" */
public static final String ARRAY_SUFFIX = "[]";
/** Prefix for internal array class names: "[L" */
private static final String INTERNAL_ARRAY_PREFIX = "[L";
/** The package separator character '.' */
private static final char PACKAGE_SEPARATOR = '.';
/** The inner class separator character '$' */
private static final char INNER_CLASS_SEPARATOR = '$';
/** The CGLIB class separator character "$$" */
public static final String CGLIB_CLASS_SEPARATOR = "$$";
/** The ".class" file suffix */
public static final String CLASS_FILE_SUFFIX = ".class";
/**
* Map with primitive wrapper type as key and corresponding primitive type
* as value, for example: Integer.class -> int.class.
*/
private static final Map primitiveWrapperTypeMap = new HashMap(8);
/**
* Map with primitive type name as key and corresponding primitive type as
* value, for example: "int" -> "int.class".
*/
private static final Map primitiveTypeNameMap = new HashMap(16);
static
{
primitiveWrapperTypeMap.put(Boolean.class, boolean.class);
primitiveWrapperTypeMap.put(Byte.class, byte.class);
primitiveWrapperTypeMap.put(Character.class, char.class);
primitiveWrapperTypeMap.put(Double.class, double.class);
primitiveWrapperTypeMap.put(Float.class, float.class);
primitiveWrapperTypeMap.put(Integer.class, int.class);
primitiveWrapperTypeMap.put(Long.class, long.class);
primitiveWrapperTypeMap.put(Short.class, short.class);
Set primitiveTypeNames = new HashSet(16);
primitiveTypeNames.addAll(primitiveWrapperTypeMap.values());
primitiveTypeNames.addAll(Arrays.asList(new Class[] { boolean[].class,
byte[].class, char[].class, double[].class, float[].class,
int[].class, long[].class, short[].class }));
for (Iterator it = primitiveTypeNames.iterator(); it.hasNext();)
{
Class primitiveClass = (Class) it.next();
primitiveTypeNameMap.put(primitiveClass.getName(), primitiveClass);
}
}
/**
* Return the default ClassLoader to use: typically the thread context
* ClassLoader, if available; the ClassLoader that loaded the ClassUtils
* class will be used as fallback.
*
* Call this method if you intend to use the thread context ClassLoader in a
* scenario where you absolutely need a non-null ClassLoader reference: for
* example, for class path resource loading (but not necessarily for
* Class.forName, which accepts a null ClassLoader
* reference as well).
*
* @return the default ClassLoader (never null)
* @see java.lang.Thread#getContextClassLoader()
*/
public static ClassLoader getDefaultClassLoader()
{
ClassLoader cl = null;
try
{
cl = Thread.currentThread().getContextClassLoader();
}
catch (Throwable ex)
{
// Cannot access thread context ClassLoader - falling back to system
// class loader...
}
if (cl == null)
{
// No thread context class loader -> use class loader of this class.
cl = ClassUtils.class.getClassLoader();
}
return cl;
}
/**
* Override the thread context ClassLoader with the environment's bean
* ClassLoader if necessary, i.e. if the bean ClassLoader is not equivalent
* to the thread context ClassLoader already.
*
* @param classLoaderToUse
* the actual ClassLoader to use for the thread context
* @return the original thread context ClassLoader, or null if
* not overridden
*/
public static ClassLoader overrideThreadContextClassLoader(
ClassLoader classLoaderToUse)
{
Thread currentThread = Thread.currentThread();
ClassLoader threadContextClassLoader = currentThread
.getContextClassLoader();
if (classLoaderToUse != null
&& !classLoaderToUse.equals(threadContextClassLoader))
{
currentThread.setContextClassLoader(classLoaderToUse);
return threadContextClassLoader;
}
else
{
return null;
}
}
/**
* Replacement for Class.forName() that also returns Class
* instances for primitives (like "int") and array class names (like
* "String[]").
*
* Always uses the default class loader: that is, preferably the thread
* context class loader, or the ClassLoader that loaded the ClassUtils class
* as fallback.
*
* @param name
* the name of the Class
* @return Class instance for the supplied name
* @throws ClassNotFoundException
* if the class was not found
* @throws LinkageError
* if the class file could not be loaded
* @see Class#forName(String, boolean, ClassLoader)
* @see #getDefaultClassLoader()
*/
public static Class forName(String name) throws ClassNotFoundException,
LinkageError
{
return forName(name, getDefaultClassLoader());
}
/**
* Replacement for Class.forName() that also returns Class
* instances for primitives (like "int") and array class names (like
* "String[]").
*
* @param name
* the name of the Class
* @param classLoader
* the class loader to use (may be null, which
* indicates the default class loader)
* @return Class instance for the supplied name
* @throws ClassNotFoundException
* if the class was not found
* @throws LinkageError
* if the class file could not be loaded
* @see Class#forName(String, boolean, ClassLoader)
*/
public static Class forName(String name, ClassLoader classLoader)
throws ClassNotFoundException, LinkageError
{
Assert.notNull(name, "Name must not be null");
Class clazz = resolvePrimitiveClassName(name);
if (clazz != null)
{
return clazz;
}
// "java.lang.String[]" style arrays
if (name.endsWith(ARRAY_SUFFIX))
{
String elementClassName = name.substring(0, name.length()
- ARRAY_SUFFIX.length());
Class elementClass = forName(elementClassName, classLoader);
return Array.newInstance(elementClass, 0).getClass();
}
// "[Ljava.lang.String;" style arrays
int internalArrayMarker = name.indexOf(INTERNAL_ARRAY_PREFIX);
if (internalArrayMarker != -1 && name.endsWith(";"))
{
String elementClassName = null;
if (internalArrayMarker == 0)
{
elementClassName = name.substring(INTERNAL_ARRAY_PREFIX
.length(), name.length() - 1);
}
else if (name.startsWith("["))
{
elementClassName = name.substring(1);
}
Class elementClass = forName(elementClassName, classLoader);
return Array.newInstance(elementClass, 0).getClass();
}
ClassLoader classLoaderToUse = classLoader;
if (classLoaderToUse == null)
{
classLoaderToUse = getDefaultClassLoader();
}
return classLoaderToUse.loadClass(name);
}
/**
* Resolve the given class name into a Class instance. Supports primitives
* (like "int") and array class names (like "String[]").
*
* This is effectively equivalent to the forName method with
* the same arguments, with the only difference being the exceptions thrown
* in case of class loading failure.
*
* @param className
* the name of the Class
* @param classLoader
* the class loader to use (may be null, which
* indicates the default class loader)
* @return Class instance for the supplied name
* @throws IllegalArgumentException
* if the class name was not resolvable (that is, the class
* could not be found or the class file could not be loaded)
* @see #forName(String, ClassLoader)
*/
public static Class resolveClassName(String className,
ClassLoader classLoader) throws IllegalArgumentException
{
try
{
return forName(className, classLoader);
}
catch (ClassNotFoundException ex)
{
IllegalArgumentException iae = new IllegalArgumentException(
"Cannot find class [" + className + "]");
iae.initCause(ex);
throw iae;
}
catch (LinkageError ex)
{
IllegalArgumentException iae = new IllegalArgumentException(
"Error loading class [" + className
+ "]: problem with class file or dependent class.");
iae.initCause(ex);
throw iae;
}
}
/**
* Resolve the given class name as primitive class, if appropriate,
* according to the JVM's naming rules for primitive classes.
*
* Also supports the JVM's internal class names for primitive arrays. Does
* not support the "[]" suffix notation for primitive arrays; this is
* only supported by {@link #forName}.
*
* @param name
* the name of the potentially primitive class
* @return the primitive class, or null if the name does not
* denote a primitive class or primitive array class
*/
public static Class resolvePrimitiveClassName(String name)
{
Class result = null;
// Most class names will be quite long, considering that they
// SHOULD sit in a package, so a length check is worthwhile.
if (name != null && name.length() <= 8)
{
// Could be a primitive - likely.
result = (Class) primitiveTypeNameMap.get(name);
}
return result;
}
/**
* Determine whether the {@link Class} identified by the supplied name is
* present and can be loaded. Will return false if either the
* class or one of its dependencies is not present or cannot be loaded.
*
* @param className
* the name of the class to check
* @return whether the specified class is present
* @deprecated as of Bboss 2.5, in favor of
* {@link #isPresent(String, ClassLoader)}
*/
public static boolean isPresent(String className)
{
return isPresent(className, getDefaultClassLoader());
}
/**
* Determine whether the {@link Class} identified by the supplied name is
* present and can be loaded. Will return false if either the
* class or one of its dependencies is not present or cannot be loaded.
*
* @param className
* the name of the class to check
* @param classLoader
* the class loader to use (may be null, which
* indicates the default class loader)
* @return whether the specified class is present
*/
public static boolean isPresent(String className, ClassLoader classLoader)
{
try
{
forName(className, classLoader);
return true;
}
catch (Throwable ex)
{
// Class or one of its dependencies is not present...
return false;
}
}
/**
* Return the user-defined class for the given instance: usually simply the
* class of the given instance, but the original class in case of a
* CGLIB-generated subclass.
*
* @param instance
* the instance to check
* @return the user-defined class
*/
public static Class getUserClass(Object instance)
{
Assert.notNull(instance, "Instance must not be null");
return getUserClass(instance.getClass());
}
/**
* Return the user-defined class for the given class: usually simply the
* given class, but the original class in case of a CGLIB-generated
* subclass.
*
* @param clazz
* the class to check
* @return the user-defined class
*/
public static Class getUserClass(Class clazz)
{
return (clazz != null
&& clazz.getName().indexOf(CGLIB_CLASS_SEPARATOR) != -1 ? clazz
.getSuperclass() : clazz);
}
/**
* Check whether the given class is cache-safe in the given context, i.e.
* whether it is loaded by the given ClassLoader or a parent of it.
*
* @param clazz
* the class to analyze
* @param classLoader
* the ClassLoader to potentially cache metadata in
*/
public static boolean isCacheSafe(Class clazz, ClassLoader classLoader)
{
Assert.notNull(clazz, "Class must not be null");
ClassLoader target = clazz.getClassLoader();
if (target == null)
{
return false;
}
ClassLoader cur = classLoader;
if (cur == target)
{
return true;
}
while (cur != null)
{
cur = cur.getParent();
if (cur == target)
{
return true;
}
}
return false;
}
/**
* Get the class name without the qualified package name.
*
* @param className
* the className to get the short name for
* @return the class name of the class without the package name
* @throws IllegalArgumentException
* if the className is empty
*/
public static String getShortName(String className)
{
Assert.hasLength(className, "Class name must not be empty");
int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR);
int nameEndIndex = className.indexOf(CGLIB_CLASS_SEPARATOR);
if (nameEndIndex == -1)
{
nameEndIndex = className.length();
}
String shortName = className.substring(lastDotIndex + 1, nameEndIndex);
shortName = shortName.replace(INNER_CLASS_SEPARATOR, PACKAGE_SEPARATOR);
return shortName;
}
/**
* Get the class name without the qualified package name.
*
* @param clazz
* the class to get the short name for
* @return the class name of the class without the package name
*/
public static String getShortName(Class clazz)
{
return getShortName(getQualifiedName(clazz));
}
/**
* Return the short string name of a Java class in decapitalized JavaBeans
* property format. Strips the outer class name in case of an inner class.
*
* @param clazz
* the class
* @return the short name rendered in a standard JavaBeans property format
* @see java.beans.Introspector#decapitalize(String)
*/
public static String getShortNameAsProperty(Class clazz)
{
String shortName = ClassUtils.getShortName(clazz);
int dotIndex = shortName.lastIndexOf('.');
shortName = (dotIndex != -1 ? shortName.substring(dotIndex + 1)
: shortName);
return Introspector.decapitalize(shortName);
}
/**
* Determine the name of the class file, relative to the containing package:
* e.g. "String.class"
*
* @param clazz
* the class
* @return the file name of the ".class" file
*/
public static String getClassFileName(Class clazz)
{
Assert.notNull(clazz, "Class must not be null");
String className = clazz.getName();
int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR);
return className.substring(lastDotIndex + 1) + CLASS_FILE_SUFFIX;
}
/**
* Determine the name of the package of the given class: e.g. "java.lang"
* for the java.lang.String class.
*
* @param clazz
* the class
* @return the package name, or the empty String if the class is defined in
* the default package
*/
public static String getPackageName(Class clazz)
{
Assert.notNull(clazz, "Class must not be null");
String className = clazz.getName();
int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR);
return (lastDotIndex != -1 ? className.substring(0, lastDotIndex) : "");
}
/**
* Return the qualified name of the given class: usually simply the class
* name, but component type class name + "[]" for arrays.
*
* @param clazz
* the class
* @return the qualified name of the class
*/
public static String getQualifiedName(Class clazz)
{
Assert.notNull(clazz, "Class must not be null");
if (clazz.isArray())
{
return getQualifiedNameForArray(clazz);
}
else
{
return clazz.getName();
}
}
/**
* Build a nice qualified name for an array: component type class name +
* "[]".
*
* @param clazz
* the array class
* @return a qualified name for the array class
*/
private static String getQualifiedNameForArray(Class clazz)
{
StringBuilder buffer = new StringBuilder();
while (clazz.isArray())
{
clazz = clazz.getComponentType();
buffer.append(ClassUtils.ARRAY_SUFFIX);
}
buffer.insert(0, clazz.getName());
return buffer.toString();
}
/**
* Return the qualified name of the given method, consisting of fully
* qualified interface/class name + "." + method name.
*
* @param method
* the method
* @return the qualified name of the method
*/
public static String getQualifiedMethodName(Method method)
{
Assert.notNull(method, "Method must not be null");
return method.getDeclaringClass().getName() + "." + method.getName();
}
/**
* Return a descriptive name for the given object's type: usually simply the
* class name, but component type class name + "[]" for arrays, and an
* appended list of implemented interfaces for JDK proxies.
*
* @param value
* the value to introspect
* @return the qualified name of the class
*/
public static String getDescriptiveType(Object value)
{
if (value == null)
{
return null;
}
Class clazz = value.getClass();
if (Proxy.isProxyClass(clazz))
{
StringBuilder buf = new StringBuilder(clazz.getName());
buf.append(" implementing ");
Class[] ifcs = clazz.getInterfaces();
for (int i = 0; i < ifcs.length; i++)
{
buf.append(ifcs[i].getName());
if (i < ifcs.length - 1)
{
buf.append(',');
}
}
return buf.toString();
}
else if (clazz.isArray())
{
return getQualifiedNameForArray(clazz);
}
else
{
return clazz.getName();
}
}
/**
* Determine whether the given class has a constructor with the given
* signature.
*
* Essentially translates NoSuchMethodException to "false".
*
* @param clazz
* the clazz to analyze
* @param paramTypes
* the parameter types of the method
* @return whether the class has a corresponding constructor
* @see java.lang.Class#getMethod
*/
public static boolean hasConstructor(Class clazz, Class[] paramTypes)
{
return (getConstructorIfAvailable(clazz, paramTypes) != null);
}
/**
* Determine whether the given class has a constructor with the given
* signature, and return it if available (else return null).
*
* Essentially translates NoSuchMethodException to
* null.
*
* @param clazz
* the clazz to analyze
* @param paramTypes
* the parameter types of the method
* @return the constructor, or null if not found
* @see java.lang.Class#getConstructor
*/
public static Constructor getConstructorIfAvailable(Class clazz,
Class[] paramTypes)
{
Assert.notNull(clazz, "Class must not be null");
try
{
return clazz.getConstructor(paramTypes);
}
catch (NoSuchMethodException ex)
{
return null;
}
}
/**
* Determine whether the given class has a method with the given signature.
*
* Essentially translates NoSuchMethodException to "false".
*
* @param clazz
* the clazz to analyze
* @param methodName
* the name of the method
* @param paramTypes
* the parameter types of the method
* @return whether the class has a corresponding method
* @see java.lang.Class#getMethod
*/
public static boolean hasMethod(Class clazz, String methodName,
Class... paramTypes)
{
return (getMethodIfAvailable(clazz, methodName, paramTypes) != null);
}
/**
* Determine whether the given class has a method with the given signature,
* and return it if available (else return null).
*
* Essentially translates NoSuchMethodException to
* null.
*
* @param clazz
* the clazz to analyze
* @param methodName
* the name of the method
* @param paramTypes
* the parameter types of the method
* @return the method, or null if not found
* @see java.lang.Class#getMethod
*/
public static Method getMethodIfAvailable(Class clazz, String methodName,
Class... paramTypes)
{
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(methodName, "Method name must not be null");
try
{
return clazz.getMethod(methodName, paramTypes);
}
catch (NoSuchMethodException ex)
{
return null;
}
}
/**
* Return the number of methods with a given name (with any argument types),
* for the given class and/or its superclasses. Includes non-public methods.
*
* @param clazz
* the clazz to check
* @param methodName
* the name of the method
* @return the number of methods with the given name
*/
public static int getMethodCountForName(Class clazz, String methodName)
{
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(methodName, "Method name must not be null");
int count = 0;
Method[] declaredMethods = clazz.getDeclaredMethods();
for (int i = 0; i < declaredMethods.length; i++)
{
Method method = declaredMethods[i];
if (methodName.equals(method.getName()))
{
count++;
}
}
Class[] ifcs = clazz.getInterfaces();
for (int i = 0; i < ifcs.length; i++)
{
count += getMethodCountForName(ifcs[i], methodName);
}
if (clazz.getSuperclass() != null)
{
count += getMethodCountForName(clazz.getSuperclass(), methodName);
}
return count;
}
/**
* Does the given class and/or its superclasses at least have one or more
* methods (with any argument types)? Includes non-public methods.
*
* @param clazz
* the clazz to check
* @param methodName
* the name of the method
* @return whether there is at least one method with the given name
*/
public static boolean hasAtLeastOneMethodWithName(Class clazz,
String methodName)
{
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(methodName, "Method name must not be null");
Method[] declaredMethods = clazz.getDeclaredMethods();
for (int i = 0; i < declaredMethods.length; i++)
{
Method method = declaredMethods[i];
if (method.getName().equals(methodName))
{
return true;
}
}
Class[] ifcs = clazz.getInterfaces();
for (int i = 0; i < ifcs.length; i++)
{
if (hasAtLeastOneMethodWithName(ifcs[i], methodName))
{
return true;
}
}
return (clazz.getSuperclass() != null && hasAtLeastOneMethodWithName(
clazz
.getSuperclass(),
methodName));
}
/**
* Given a method, which may come from an interface, and a target class used
* in the current reflective invocation, find the corresponding target
* method if there is one. E.g. the method may be IFoo.bar()
* and the target class may be DefaultFoo. In this case, the
* method may be DefaultFoo.bar(). This enables attributes on
* that method to be found.
*
* this method does not resolve Java 5 bridge methods automatically.
*
* if bridge method resolution is desirable (e.g. for obtaining metadata
* from the original method definition).
*
* @param method
* the method to be invoked, which may come from an interface
* @param targetClass
* the target class for the current invocation. May be
* null or may not even implement the method.
* @return the specific target method, or the original method if the
* targetClass doesn't implement it or is
* null
*/
public static Method getMostSpecificMethod(Method method, Class targetClass)
{
if (method != null && targetClass != null
&& !targetClass.equals(method.getDeclaringClass()))
{
try
{
method = targetClass.getMethod(method.getName(), method
.getParameterTypes());
}
catch (NoSuchMethodException ex)
{
// Perhaps the target class doesn't implement this method:
// that's fine, just use the original method.
}
}
return method;
}
/**
* Return a static method of a class.
*
* @param methodName
* the static method name
* @param clazz
* the class which defines the method
* @param args
* the parameter types to the method
* @return the static method, or null if no static method was
* found
* @throws IllegalArgumentException
* if the method name is blank or the clazz is null
*/
public static Method getStaticMethod(Class clazz, String methodName,
Class[] args)
{
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(methodName, "Method name must not be null");
try
{
Method method = clazz.getDeclaredMethod(methodName, args);
if ((method.getModifiers() & Modifier.STATIC) != 0)
{
return method;
}
}
catch (NoSuchMethodException ex)
{
}
return null;
}
/**
* Check if the given class represents a primitive wrapper, i.e. Boolean,
* Byte, Character, Short, Integer, Long, Float, or Double.
*
* @param clazz
* the class to check
* @return whether the given class is a primitive wrapper class
*/
public static boolean isPrimitiveWrapper(Class clazz)
{
Assert.notNull(clazz, "Class must not be null");
return primitiveWrapperTypeMap.containsKey(clazz);
}
/**
* Check if the given class represents a primitive (i.e. boolean, byte,
* char, short, int, long, float, or double) or a primitive wrapper (i.e.
* Boolean, Byte, Character, Short, Integer, Long, Float, or Double).
*
* @param clazz
* the class to check
* @return whether the given class is a primitive or primitive wrapper class
*/
public static boolean isPrimitiveOrWrapper(Class clazz)
{
Assert.notNull(clazz, "Class must not be null");
return (clazz.isPrimitive() || isPrimitiveWrapper(clazz));
}
/**
* Check if the given class represents an array of primitives, i.e. boolean,
* byte, char, short, int, long, float, or double.
*
* @param clazz
* the class to check
* @return whether the given class is a primitive array class
*/
public static boolean isPrimitiveArray(Class clazz)
{
Assert.notNull(clazz, "Class must not be null");
return (clazz.isArray() && clazz.getComponentType().isPrimitive());
}
/**
* Check if the given class represents an array of primitive wrappers, i.e.
* Boolean, Byte, Character, Short, Integer, Long, Float, or Double.
*
* @param clazz
* the class to check
* @return whether the given class is a primitive wrapper array class
*/
public static boolean isPrimitiveWrapperArray(Class clazz)
{
Assert.notNull(clazz, "Class must not be null");
return (clazz.isArray() && isPrimitiveWrapper(clazz.getComponentType()));
}
/**
* Check if the right-hand side type may be assigned to the left-hand side
* type, assuming setting by reflection. Considers primitive wrapper classes
* as assignable to the corresponding primitive types.
*
* @param lhsType
* the target type
* @param rhsType
* the value type that should be assigned to the target type
* @return if the target type is assignable from the value type
* @see TypeUtils#isAssignable
*/
public static boolean isAssignable(Class lhsType, Class rhsType)
{
Assert.notNull(lhsType, "Left-hand side type must not be null");
Assert.notNull(rhsType, "Right-hand side type must not be null");
return (lhsType.isAssignableFrom(rhsType) || lhsType
.equals(primitiveWrapperTypeMap.get(rhsType)));
}
/**
* Determine if the given type is assignable from the given value, assuming
* setting by reflection. Considers primitive wrapper classes as assignable
* to the corresponding primitive types.
*
* @param type
* the target type
* @param value
* the value that should be assigned to the type
* @return if the type is assignable from the value
*/
public static boolean isAssignableValue(Class type, Object value)
{
Assert.notNull(type, "Type must not be null");
return (value != null ? isAssignable(type, value.getClass()) : !type
.isPrimitive());
}
/**
* Convert a "/"-based resource path to a "."-based fully qualified class
* name.
*
* @param resourcePath
* the resource path pointing to a class
* @return the corresponding fully qualified class name
*/
public static String convertResourcePathToClassName(String resourcePath)
{
return resourcePath.replace('/', '.');
}
/**
* Convert a "."-based fully qualified class name to a "/"-based resource
* path.
*
* @param className
* the fully qualified class name
* @return the corresponding resource path, pointing to the class
*/
public static String convertClassNameToResourcePath(String className)
{
return className.replace('.', '/');
}
/**
* Return a path suitable for use with ClassLoader.getResource
* (also suitable for use with Class.getResource by prepending
* a slash ('/') to the return value. Built by taking the package of the
* specified class file, converting all dots ('.') to slashes ('/'), adding
* a trailing slash if necesssary, and concatenating the specified resource
* name to this.
* As such, this function may be used to build a path suitable for loading a
* resource file that is in the same package as a class file,
*
* even more convenient.
*
* @param clazz
* the Class whose package will be used as the base
* @param resourceName
* the resource name to append. A leading slash is optional.
* @return the built-up resource path
* @see java.lang.ClassLoader#getResource
* @see java.lang.Class#getResource
*/
public static String addResourcePathToPackagePath(Class clazz,
String resourceName)
{
Assert.notNull(resourceName, "Resource name must not be null");
if (!resourceName.startsWith("/"))
{
return classPackageAsResourcePath(clazz) + "/" + resourceName;
}
return classPackageAsResourcePath(clazz) + resourceName;
}
/**
* Given an input class object, return a string which consists of the
* class's package name as a pathname, i.e., all dots ('.') are replaced by
* slashes ('/'). Neither a leading nor trailing slash is added. The result
* could be concatenated with a slash and the name of a resource, and fed
* directly to ClassLoader.getResource(). For it to be fed to
* Class.getResource instead, a leading slash would also have
* to be prepended to the returned value.
*
* @param clazz
* the input class. A null value or the default
* (empty) package will result in an empty string ("") being
* returned.
* @return a path which represents the package name
* @see ClassLoader#getResource
* @see Class#getResource
*/
public static String classPackageAsResourcePath(Class clazz)
{
if (clazz == null)
{
return "";
}
String className = clazz.getName();
int packageEndIndex = className.lastIndexOf('.');
if (packageEndIndex == -1)
{
return "";
}
String packageName = className.substring(0, packageEndIndex);
return packageName.replace('.', '/');
}
/**
* Build a String that consists of the names of the classes/interfaces in
* the given array.
*
* Basically like AbstractCollection.toString(), but stripping
* the "class "/"interface " prefix before every class name.
*
* @param classes
* a Collection of Class objects (may be null)
* @return a String of form "[com.foo.Bar, com.foo.Baz]"
* @see java.util.AbstractCollection#toString()
*/
public static String classNamesToString(Class[] classes)
{
return classNamesToString(Arrays.asList(classes));
}
/**
* Build a String that consists of the names of the classes/interfaces in
* the given collection.
*
* Basically like AbstractCollection.toString(), but stripping
* the "class "/"interface " prefix before every class name.
*
* @param classes
* a Collection of Class objects (may be null)
* @return a String of form "[com.foo.Bar, com.foo.Baz]"
* @see java.util.AbstractCollection#toString()
*/
public static String classNamesToString(Collection classes)
{
if (CollectionUtils.isEmpty(classes))
{
return "[]";
}
StringBuilder sb = new StringBuilder("[");
for (Iterator it = classes.iterator(); it.hasNext();)
{
Class clazz = (Class) it.next();
sb.append(clazz.getName());
if (it.hasNext())
{
sb.append(", ");
}
}
sb.append("]");
return sb.toString();
}
/**
* Return all interfaces that the given instance implements as array,
* including ones implemented by superclasses.
*
* @param instance
* the instance to analyse for interfaces
* @return all interfaces that the given instance implements as array
*/
public static Class[] getAllInterfaces(Object instance)
{
Assert.notNull(instance, "Instance must not be null");
return getAllInterfacesForClass(instance.getClass());
}
/**
* Return all interfaces that the given class implements as array, including
* ones implemented by superclasses.
*
* If the class itself is an interface, it gets returned as sole interface.
*
* @param clazz
* the class to analyse for interfaces
* @return all interfaces that the given object implements as array
*/
public static Class[] getAllInterfacesForClass(Class clazz)
{
return getAllInterfacesForClass(clazz, null);
}
/**
* Return all interfaces that the given class implements as array, including
* ones implemented by superclasses.
*
* If the class itself is an interface, it gets returned as sole interface.
*
* @param clazz
* the class to analyse for interfaces
* @param classLoader
* the ClassLoader that the interfaces need to be visible in (may
* be null when accepting all declared interfaces)
* @return all interfaces that the given object implements as array
*/
public static Class[] getAllInterfacesForClass(Class clazz,
ClassLoader classLoader)
{
Assert.notNull(clazz, "Class must not be null");
if (clazz.isInterface())
{
return new Class[] { clazz };
}
List interfaces = new ArrayList();
while (clazz != null)
{
for (int i = 0; i < clazz.getInterfaces().length; i++)
{
Class ifc = clazz.getInterfaces()[i];
if (!interfaces.contains(ifc)
&& (classLoader == null || isVisible(ifc, classLoader)))
{
interfaces.add(ifc);
}
}
clazz = clazz.getSuperclass();
}
return (Class[]) interfaces.toArray(new Class[interfaces.size()]);
}
/**
* Return all interfaces that the given instance implements as Set,
* including ones implemented by superclasses.
*
* @param instance
* the instance to analyse for interfaces
* @return all interfaces that the given instance implements as Set
*/
public static Set getAllInterfacesAsSet(Object instance)
{
Assert.notNull(instance, "Instance must not be null");
return getAllInterfacesForClassAsSet(instance.getClass());
}
/**
* Return all interfaces that the given class implements as Set, including
* ones implemented by superclasses.
*
* If the class itself is an interface, it gets returned as sole interface.
*
* @param clazz
* the class to analyse for interfaces
* @return all interfaces that the given object implements as Set
*/
public static Set getAllInterfacesForClassAsSet(Class clazz)
{
return getAllInterfacesForClassAsSet(clazz, null);
}
/**
* Return all interfaces that the given class implements as Set, including
* ones implemented by superclasses.
*
* If the class itself is an interface, it gets returned as sole interface.
*
* @param clazz
* the class to analyse for interfaces
* @param classLoader
* the ClassLoader that the interfaces need to be visible in (may
* be null when accepting all declared interfaces)
* @return all interfaces that the given object implements as Set
*/
public static Set getAllInterfacesForClassAsSet(Class clazz,
ClassLoader classLoader)
{
Assert.notNull(clazz, "Class must not be null");
if (clazz.isInterface())
{
return Collections.singleton(clazz);
}
Set interfaces = new LinkedHashSet();
while (clazz != null)
{
for (int i = 0; i < clazz.getInterfaces().length; i++)
{
Class ifc = clazz.getInterfaces()[i];
if (classLoader == null || isVisible(ifc, classLoader))
{
interfaces.add(ifc);
}
}
clazz = clazz.getSuperclass();
}
return interfaces;
}
/**
* Create a composite interface Class for the given interfaces, implementing
* the given interfaces in one single Class.
*
* This implementation builds a JDK proxy class for the given interfaces.
*
* @param interfaces
* the interfaces to merge
* @param classLoader
* the ClassLoader to create the composite Class in
* @return the merged interface as Class
* @see java.lang.reflect.Proxy#getProxyClass
*/
public static Class createCompositeInterface(Class[] interfaces,
ClassLoader classLoader)
{
Assert.notEmpty(interfaces, "Interfaces must not be empty");
Assert.notNull(classLoader, "ClassLoader must not be null");
return Proxy.getProxyClass(classLoader, interfaces);
}
/**
* Check whether the given class is visible in the given ClassLoader.
*
* @param clazz
* the class to check (typically an interface)
* @param classLoader
* the ClassLoader to check against (may be null, in
* which case this method will always return true)
*/
public static boolean isVisible(Class clazz, ClassLoader classLoader)
{
if (classLoader == null)
{
return true;
}
try
{
Class actualClass = classLoader.loadClass(clazz.getName());
return (clazz == actualClass);
// Else: different interface class found...
}
catch (ClassNotFoundException ex)
{
// No interface class found...
return false;
}
}
public static Class genericParameterType(Method method, int posistion)
{
Type[] types = method.getGenericParameterTypes();
// Class[] pts = method.getParameterTypes();
if (types == null || types.length == 0)
{
return null;
}
Type type = types[posistion];
if (type instanceof ParameterizedType)
{
Type[] types_ = ((ParameterizedType) type).getActualTypeArguments();
if(types_ == null || types_.length == 0)
{
return null;
}
Type zzz = types_[0];
return zzz instanceof Class?(Class) zzz:null;
}
return null;
}
public static Class genericType(Field field)
{
Type type = field.getGenericType();
// Class[] pts = method.getParameterTypes();
if (type == null)
{
return null;
}
// Type type = types[posistion];
if (type instanceof ParameterizedType)
{
Type[] types = ((ParameterizedType) type).getActualTypeArguments();
if(types == null || types.length == 0)
{
return null;
}
Type zzz = types[0];
return zzz instanceof Class?(Class) zzz:null;
}
return null;
}
public static Class[] genericParameterTypes(Method method, int posistion)
{
Type[] types = method.getGenericParameterTypes();
// Class[] pts = method.getParameterTypes();
if (types == null || types.length == 0)
{
return null;
}
// for(int i = 0; i < types.length; i ++)
Type type = types[posistion];
if (type instanceof ParameterizedType)
{
Type[] ptypes = ((ParameterizedType) type)
.getActualTypeArguments();
Class[] genericParameterTypes = new Class[ptypes.length];
int i = 0;
for (Type zzz : ptypes)
{
if(zzz instanceof Class)
{
genericParameterTypes[i] = (Class) zzz;
i++;
}
}
return resizeClasses(genericParameterTypes,i);
}
return null;
}
public static Class[] genericTypes(Field field)
{
if (field == null )
{
return null;
}
Type type = field.getGenericType();
// Class[] pts = method.getParameterTypes();
if (type == null )
{
return null;
}
if (type instanceof ParameterizedType)
{
Type[] ptypes = ((ParameterizedType) type)
.getActualTypeArguments();
Class[] genericParameterTypes = new Class[ptypes.length];
int i = 0;
for (Type zzz : ptypes)
{
if(zzz instanceof Class)
{
genericParameterTypes[i] = (Class) zzz;
i++;
}
}
return resizeClasses(genericParameterTypes,i);
}
return null;
}
private static Class[] resizeClasses(Class[] clazzes,int i)
{
if(i == clazzes.length || i == 0)
return clazzes;
Class[] newclazzes = new Class[i];
for(int j = 0; j < i; j ++)
{
newclazzes[j] = clazzes[j];
}
return newclazzes;
}
public static Class getPropertyGenericType(Method writeMethod)
{
// Type[] types = writeMethod.getGenericParameterTypes();
//
// if (types == null || types.length == 0)
// {
// return null;
// }
// Class genericParameterType = null;
// Type type = types[0];
// if (type instanceof ParameterizedType)
// {
//// Class listClass = (Class) type;
//// if (List.class.isAssignableFrom(listClass)
//// || Set.class.isAssignableFrom(listClass))
// {
// Type zzz = ((ParameterizedType) type).getActualTypeArguments()[0];
// genericParameterType = (Class) zzz;
// }
// }
//
// return genericParameterType;
return ClassUtils.genericParameterType(writeMethod, 0);
}
public static Class[] getPropertyGenericTypes(Method writeMethod)
{
// Type[] types = writeMethod.getGenericParameterTypes();
//
// if (types == null || types.length == 0)
// {
// return null;
// }
// Class genericParameterType = null;
// Type type = types[0];
// if (type instanceof ParameterizedType)
// {
//// Class listClass = (Class) type;
//// if (List.class.isAssignableFrom(listClass)
//// || Set.class.isAssignableFrom(listClass))
// {
// Type zzz = ((ParameterizedType) type).getActualTypeArguments()[0];
// genericParameterType = (Class) zzz;
// }
// }
return ClassUtils.genericParameterTypes(writeMethod, 0);
}
}