org.picketlink.common.reflection.Reflections Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source
*
* Copyright 2013 Red Hat, Inc. and/or its affiliates.
*
* 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.picketlink.common.reflection;
import java.beans.Introspector;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.security.AccessController;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.enterprise.inject.spi.AnnotatedField;
import javax.enterprise.inject.spi.AnnotatedType;
import javax.enterprise.inject.spi.BeanManager;
import javax.inject.Qualifier;
/**
* Utility class for working with JDK Reflection and also CDI's
* {@link Annotated} metadata.
*
*/
public class Reflections
{
/**
* An empty array of type {@link Annotation}, useful converting lists to
* arrays.
*/
public static final Annotation[] EMPTY_ANNOTATION_ARRAY = new Annotation[0];
/**
* An empty array of type {@link Object}, useful for converting lists to
* arrays.
*/
public static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
public static final Type[] EMPTY_TYPES = {};
public static final Class[] EMPTY_CLASSES = new Class[0];
private Reflections()
{
}
/**
*
* Perform a runtime cast. Similar to {@link Class#cast(Object)}, but useful
* when you do not have a {@link Class} object for type you wish to cast to.
*
*
*
* {@link Class#cast(Object)} should be used if possible
*
*
* @param the type to cast to
* @param obj the object to perform the cast on
* @return the casted object
* @throws ClassCastException if the type T is not a subtype of the object
* @see Class#cast(Object)
*/
@SuppressWarnings("unchecked")
public static T cast(Object obj)
{
return (T) obj;
}
/**
* Get all the declared fields on the class hierarchy. This will
* return overridden fields.
*
* @param clazz The class to search
* @return the set of all declared fields or an empty set if there are none
*/
public static Set getAllDeclaredFields(Class clazz)
{
HashSet fields = new HashSet();
for (Class c = clazz; c != null && c != Object.class; c = c.getSuperclass())
{
for (Field a : c.getDeclaredFields())
{
fields.add(a);
}
}
return fields;
}
/**
* Search the class hierarchy for a field with the given name. Will return
* the nearest match, starting with the class specified and searching up the
* hierarchy.
*
* @param clazz The class to search
* @param name The name of the field to search for
* @return The field found, or null if no field is found
*/
public static Field findDeclaredField(Class clazz, String name)
{
for (Class c = clazz; c != null && c != Object.class; c = c.getSuperclass())
{
try
{
return c.getDeclaredField(name);
}
catch (NoSuchFieldException e)
{
// No-op, we continue looking up the class hierarchy
}
}
return null;
}
/**
* Search the annotatedType for the field, returning the
* {@link AnnotatedField}
*
* @param annotatedType The annotatedType to search
* @param field the field to search for
* @return The {@link AnnotatedField} found, or null if no field is found
*/
public static AnnotatedField getField(AnnotatedType annotatedType, Field field)
{
for (AnnotatedField annotatedField : annotatedType.getFields())
{
if (annotatedField.getDeclaringType().getJavaClass().equals(
field.getDeclaringClass()) && annotatedField.getJavaMember().getName().equals(field.getName()))
{
return annotatedField;
}
}
return null;
}
/**
* Search for annotations with the specified meta annotation type
*
* @param annotations The annotation set to search
* @param metaAnnotationType The type of the meta annotation to search for
* @return The set of annotations with the specified meta annotation, or an
* empty set if none are found
*/
public static Set getAnnotationsWithMetaAnnotation(
Set annotations, Class metaAnnotationType)
{
Set set = new HashSet();
for (Annotation annotation : annotations)
{
if (annotation.annotationType().isAnnotationPresent(metaAnnotationType))
{
set.add(annotation);
}
}
return set;
}
/**
* Extract any qualifiers from the set of annotations
*
* @param annotations The set of annotations to search
* @param beanManager The beanManager to use to establish if an annotation is
* a qualifier
* @return The qualifiers present in the set, or an empty set if there are
* none
*/
public static Set getQualifiers(Set annotations, BeanManager beanManager)
{
Set set = new HashSet();
for (Annotation annotation : annotations)
{
if (beanManager.isQualifier(annotation.annotationType()))
{
set.add(annotation);
}
}
return set;
}
/**
* Determine if a method exists in a specified class hierarchy
*
* @param clazz The class to search
* @param name The name of the method
* @return true if a method is found, otherwise false
*/
public static boolean methodExists(Class clazz, String name)
{
for (Class c = clazz; c != null && c != Object.class; c = c.getSuperclass())
{
for (Method m : c.getDeclaredMethods())
{
if (m.getName().equals(name))
{
return true;
}
}
}
return false;
}
/**
* Get all the declared methods on the class hierarchy. This will
* return overridden methods.
*
* @param clazz The class to search
* @return the set of all declared methods or an empty set if there are none
*/
public static Set getAllDeclaredMethods(Class clazz)
{
HashSet methods = new HashSet();
for (Class c = clazz; c != null && c != Object.class; c = c.getSuperclass())
{
for (Method a : c.getDeclaredMethods())
{
methods.add(a);
}
}
return methods;
}
/**
* Search the class hierarchy for a method with the given name and arguments.
* Will return the nearest match, starting with the class specified and
* searching up the hierarchy.
*
* @param clazz The class to search
* @param name The name of the method to search for
* @param args The arguments of the method to search for
* @return The method found, or null if no method is found
*/
public static Method findDeclaredMethod(Class clazz, String name, Class... args)
{
for (Class c = clazz; c != null && c != Object.class; c = c.getSuperclass())
{
try
{
return c.getDeclaredMethod(name, args);
}
catch (NoSuchMethodException e)
{
// No-op, continue the search
}
}
return null;
}
/**
* Search the class hierarchy for a constructor with the given arguments.
* Will return the nearest match, starting with the class specified and
* searching up the hierarchy.
*
* @param clazz The class to search
* @param args The arguments of the constructor to search for
* @return The constructor found, or null if no constructor is found
*/
public static Constructor findDeclaredConstructor(Class clazz, Class... args)
{
for (Class c = clazz; c != null && c != Object.class; c = c.getSuperclass())
{
try
{
return c.getDeclaredConstructor(args);
}
catch (NoSuchMethodException e)
{
// No-op, continue the search
}
}
return null;
}
/**
* Get all the declared constructors on the class hierarchy. This will
* return overridden constructors.
*
* @param clazz The class to search
* @return the set of all declared constructors or an empty set if there are
* none
*/
public static Set> getAllDeclaredConstructors(Class clazz)
{
HashSet> constructors = new HashSet>();
for (Class c = clazz; c != null && c != Object.class; c = c.getSuperclass())
{
for (Constructor constructor : c.getDeclaredConstructors())
{
constructors.add(constructor);
}
}
return constructors;
}
/**
* Get the type of the member
*
* @param member The member
* @return The type of the member
* @throws UnsupportedOperationException if the member is not a field,
* method, or constructor
*/
public static Class getMemberType(Member member)
{
if (member instanceof Field)
{
return ((Field) member).getType();
}
else if (member instanceof Method)
{
return ((Method) member).getReturnType();
}
else if (member instanceof Constructor)
{
return ((Constructor) member).getDeclaringClass();
}
else
{
throw new UnsupportedOperationException("Cannot operate on a member of type " + member.getClass());
}
}
/**
*
* Loads and initializes a class for the given name.
*
*
*
* If the Thread Context Class Loader is available, it will be used,
* otherwise the classloader used to load {@link Reflections} will be used
*
*
*
* It is also possible to specify additional classloaders to attempt to load
* the class with. If the first attempt fails, then these additional loaders
* are tried in order.
*
*
* @param name the name of the class to load
* @param loaders additional classloaders to use to attempt to load the class
* @return the class object
* @throws ClassNotFoundException if the class cannot be found
*/
public static Class classForName(String name, ClassLoader... loaders) throws ClassNotFoundException
{
try
{
if (Thread.currentThread().getContextClassLoader() != null)
{
return Class.forName(name, true, Thread.currentThread().getContextClassLoader());
}
else
{
return Class.forName(name);
}
}
catch (ClassNotFoundException e)
{
for (ClassLoader l : loaders)
{
try
{
return Class.forName(name, true, l);
}
catch (ClassNotFoundException ex)
{
}
}
}
if (Thread.currentThread().getContextClassLoader() != null)
{
throw new ClassNotFoundException("Could not load class " + name +
" with the context class loader " + Thread.currentThread().getContextClassLoader().toString() +
" or any of the additional ClassLoaders: " + Arrays.toString(loaders));
}
else
{
throw new ClassNotFoundException("Could not load class " + name +
" using Class.forName or using any of the additional ClassLoaders: " +
Arrays.toString(loaders));
}
}
private static String buildInvokeMethodErrorMessage(Method method, Object obj, Object... args)
{
StringBuilder message = new StringBuilder(
String.format("Exception invoking method [%s] on object [%s], using arguments [",
method.getName(), obj));
if (args != null)
{
for (int i = 0; i < args.length; i++)
{
message.append((i > 0 ? "," : "") + args[i]);
}
}
message.append("]");
return message.toString();
}
/**
* Set the accessibility flag on the {@link AccessibleObject} as described in
* {@link AccessibleObject#setAccessible(boolean)} within the context of
* a {@link PrivilegedAction}.
*
* @param member the accessible object type
* @param member the accessible object
* @return the accessible object after the accessible flag has been altered
*/
public static A setAccessible(A member)
{
AccessController.doPrivileged(new SetAccessiblePriviligedAction(member));
return member;
}
/**
*
* Invoke the specified method on the provided instance, passing any additional
* arguments included in this method as arguments to the specified method.
*
*
* This method provides the same functionality and throws the same exceptions as
* {@link Reflections#invokeMethod(boolean, Method, Class, Object, Object...)}, with the
* expected return type set to {@link Object} and no change to the method's accessibility.
*
* @see Reflections#invokeMethod(boolean, Method, Class, Object, Object...)
* @see Method#invoke(Object, Object...)
*/
public static Object invokeMethod(Method method, Object instance, Object... args)
{
return invokeMethod(false, method, Object.class, instance, args);
}
/**
*
* Invoke the specified method on the provided instance, passing any additional
* arguments included in this method as arguments to the specified method.
*
*
*
* This method attempts to set the accessible flag of the method in a
* {@link PrivilegedAction} before invoking the method if the first argument
* is true.
*
*
* This method provides the same functionality and throws the same exceptions as
* {@link Reflections#invokeMethod(boolean, Method, Class, Object, Object...)}, with the
* expected return type set to {@link Object}.
*
* @see Reflections#invokeMethod(boolean, Method, Class, Object, Object...)
* @see Method#invoke(Object, Object...)
*/
public static Object invokeMethod(boolean setAccessible, Method method, Object instance, Object... args)
{
return invokeMethod(setAccessible, method, Object.class, instance, args);
}
/**
*
* Invoke the specified method on the provided instance, passing any additional
* arguments included in this method as arguments to the specified method.
*
*
* This method provides the same functionality and throws the same exceptions as
* {@link Reflections#invokeMethod(boolean, Method, Class, Object, Object...)}, with the
* expected return type set to {@link Object} and honoring the accessibility of
* the method.
*
* @see Reflections#invokeMethod(boolean, Method, Class, Object, Object...)
* @see Method#invoke(Object, Object...)
*/
public static T invokeMethod(Method method, Class expectedReturnType, Object instance, Object... args)
{
return invokeMethod(false, method, expectedReturnType, instance, args);
}
/**
*
* Invoke the method on the instance, with any arguments specified, casting
* the result of invoking the method to the expected return type.
*
*
*
* This method wraps {@link Method#invoke(Object, Object...)}, converting the
* checked exceptions that {@link Method#invoke(Object, Object...)} specifies
* to runtime exceptions.
*
*
*
* If instructed, this method attempts to set the accessible flag of the method in a
* {@link PrivilegedAction} before invoking the method.
*
*
* @param setAccessible flag indicating whether method should first be set as
* accessible
* @param method the method to invoke
* @param instance the instance to invoke the method
* @param args the arguments to the method
* @return the result of invoking the method, or null if the method's return
* type is void
* @throws RuntimeException if this Method object enforces Java
* language access control and the underlying method is
* inaccessible or if the underlying method throws an exception or
* if the initialization provoked by this method fails.
* @throws IllegalArgumentException if the method is an instance method and
* the specified instance argument is not an instance
* of the class or interface declaring the underlying method (or
* of a subclass or implementor thereof); if the number of actual
* and formal parameters differ; if an unwrapping conversion for
* primitive arguments fails; or if, after possible unwrapping, a
* parameter value cannot be converted to the corresponding formal
* parameter type by a method invocation conversion.
* @throws NullPointerException if the specified instance is
* null and the method is an instance method.
* @throws ClassCastException if the result of invoking the method cannot be
* cast to the expectedReturnType
* @throws ExceptionInInitializerError if the initialization provoked by this
* method fails.
* @see Method#invoke(Object, Object...)
*/
public static T invokeMethod(boolean setAccessible, Method method,
Class expectedReturnType, Object instance, Object... args)
{
if (setAccessible && !method.isAccessible())
{
setAccessible(method);
}
try
{
return expectedReturnType.cast(method.invoke(instance, args));
}
catch (IllegalAccessException ex)
{
throw new RuntimeException(buildInvokeMethodErrorMessage(method, instance, args), ex);
}
catch (IllegalArgumentException ex)
{
throw new IllegalArgumentException(buildInvokeMethodErrorMessage(method, instance, args), ex);
}
catch (InvocationTargetException ex)
{
throw new RuntimeException(buildInvokeMethodErrorMessage(method, instance, args), ex.getCause());
}
catch (NullPointerException ex)
{
NullPointerException ex2 = new NullPointerException(buildInvokeMethodErrorMessage(method, instance, args));
ex2.initCause(ex.getCause());
throw ex2;
}
catch (ExceptionInInitializerError e)
{
ExceptionInInitializerError e2 = new ExceptionInInitializerError(
buildInvokeMethodErrorMessage(method, instance, args));
e2.initCause(e.getCause());
throw e2;
}
}
/**
*
* Set the value of a field on the instance to the specified value.
*
*
* This method provides the same functionality and throws the same exceptions as
* {@link Reflections#setFieldValue(boolean, Method, Class, Object, Object...)}, honoring
* the accessibility of the field.
*/
public static void setFieldValue(Field field, Object instance, Object value)
{
setFieldValue(false, field, instance, value);
}
/**
*
* Sets the value of a field on the instance to the specified value.
*
*
*
* This method wraps {@link Field#set(Object, Object)}, converting the
* checked exceptions that {@link Field#set(Object, Object)} specifies to
* runtime exceptions.
*
*
*
* If instructed, this method attempts to set the accessible flag of the method in a
* {@link PrivilegedAction} before invoking the method.
*
*
* @param field the field on which to operate, or null if the field is static
* @param instance the instance on which the field value should be set upon
* @param value the value to set the field to
* @throws RuntimeException if the underlying field is inaccessible.
* @throws IllegalArgumentException if the specified instance is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof), or if an
* unwrapping conversion fails.
* @throws NullPointerException if the specified instance is null and the field
* is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked by this
* method fails.
* @see Field#set(Object, Object)
*/
public static void setFieldValue(boolean setAccessible, Field field, Object instance, Object value)
{
if (setAccessible && !field.isAccessible())
{
setAccessible(field);
}
try
{
field.set(instance, value);
}
catch (IllegalAccessException e)
{
throw new RuntimeException(buildSetFieldValueErrorMessage(field, instance, value), e);
}
catch (NullPointerException ex)
{
NullPointerException ex2 = new NullPointerException(buildSetFieldValueErrorMessage(field, instance, value));
ex2.initCause(ex.getCause());
throw ex2;
}
catch (ExceptionInInitializerError e)
{
ExceptionInInitializerError e2 = new ExceptionInInitializerError(
buildSetFieldValueErrorMessage(field, instance, value));
e2.initCause(e.getCause());
throw e2;
}
}
private static String buildSetFieldValueErrorMessage(Field field, Object obj, Object value)
{
return String.format("Exception setting [%s] field on object [%s] to value [%s]", field.getName(), obj, value);
}
private static String buildGetFieldValueErrorMessage(Field field, Object obj)
{
return String.format("Exception reading [%s] field from object [%s].", field.getName(), obj);
}
public static Object getFieldValue(Field field, Object instance)
{
return getFieldValue(field, instance, Object.class);
}
/**
*
* Get the value of the field, on the specified instance, casting the value
* of the field to the expected type.
*
*
*
* This method wraps {@link Field#get(Object)}, converting the checked
* exceptions that {@link Field#get(Object)} specifies to runtime exceptions.
*
*
* @param the type of the field's value
* @param field the field to operate on
* @param instance the instance from which to retrieve the value
* @param expectedType the expected type of the field's value
* @return the value of the field
* @throws RuntimeException if the underlying field is inaccessible.
* @throws IllegalArgumentException if the specified instance is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof).
* @throws NullPointerException if the specified instance is null and the field
* is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked by this
* method fails.
*/
public static T getFieldValue(Field field, Object instance, Class expectedType)
{
try
{
return Reflections.cast(field.get(instance));
}
catch (IllegalAccessException e)
{
throw new RuntimeException(buildGetFieldValueErrorMessage(field, instance), e);
}
catch (NullPointerException ex)
{
NullPointerException ex2 = new NullPointerException(buildGetFieldValueErrorMessage(field, instance));
ex2.initCause(ex.getCause());
throw ex2;
}
catch (ExceptionInInitializerError e)
{
ExceptionInInitializerError e2 = new ExceptionInInitializerError(
buildGetFieldValueErrorMessage(field, instance));
e2.initCause(e.getCause());
throw e2;
}
}
/**
* Extract the raw type, given a type.
*
* @param the type
* @param type the type to extract the raw type from
* @return the raw type, or null if the raw type cannot be determined.
*/
@SuppressWarnings("unchecked")
public static Class getRawType(Type type)
{
if (type instanceof Class)
{
return (Class) type;
}
else if (type instanceof ParameterizedType)
{
if (((ParameterizedType) type).getRawType() instanceof Class)
{
return (Class) ((ParameterizedType) type).getRawType();
}
}
return null;
}
/**
* Check if a class is serializable.
*
* @param clazz The class to check
* @return true if the class implements serializable or is a primitive
*/
public static boolean isSerializable(Class clazz)
{
return clazz.isPrimitive() || Serializable.class.isAssignableFrom(clazz);
}
public static Map, Type> buildTypeMap(Set types)
{
Map, Type> map = new HashMap, Type>();
for (Type type : types)
{
if (type instanceof Class)
{
map.put((Class) type, type);
}
else if (type instanceof ParameterizedType)
{
if (((ParameterizedType) type).getRawType() instanceof Class)
{
map.put((Class) ((ParameterizedType) type).getRawType(), type);
}
}
else if (type instanceof TypeVariable)
{
}
}
return map;
}
public static boolean isCacheable(Set annotations)
{
for (Annotation qualifier : annotations)
{
Class clazz = qualifier.getClass();
if (clazz.isAnonymousClass() || (clazz.isMemberClass() && isStatic(clazz)))
{
return false;
}
}
return true;
}
public static boolean isCacheable(Annotation[] annotations)
{
for (Annotation qualifier : annotations)
{
Class clazz = qualifier.getClass();
if (clazz.isAnonymousClass() || (clazz.isMemberClass() && isStatic(clazz)))
{
return false;
}
}
return true;
}
/**
* Gets the property name from a getter method.
*
* We extend JavaBean conventions, allowing the getter method to have parameters
*
* @param method The getter method
* @return The name of the property. Returns null if method wasn't JavaBean
* getter-styled
*/
public static String getPropertyName(Method method)
{
String methodName = method.getName();
if (methodName.matches("^(get).*"))
{
return Introspector.decapitalize(methodName.substring(3));
}
else if (methodName.matches("^(is).*"))
{
return Introspector.decapitalize(methodName.substring(2));
}
else
{
return null;
}
}
/**
* Checks if class is final
*
* @param clazz The class to check
* @return True if final, false otherwise
*/
public static boolean isFinal(Class clazz)
{
return Modifier.isFinal(clazz.getModifiers());
}
public static int getNesting(Class clazz)
{
if (clazz.isMemberClass() && !isStatic(clazz))
{
return 1 + getNesting(clazz.getDeclaringClass());
}
else
{
return 0;
}
}
/**
* Checks if member is final
*
* @param member The member to check
* @return True if final, false otherwise
*/
public static boolean isFinal(Member member)
{
return Modifier.isFinal(member.getModifiers());
}
/**
* Checks if member is private
*
* @param member The member to check
* @return True if final, false otherwise
*/
public static boolean isPrivate(Member member)
{
return Modifier.isPrivate(member.getModifiers());
}
/**
* Checks if type or member is final
*
* @param type Type or member
* @return True if final, false otherwise
*/
public static boolean isTypeOrAnyMethodFinal(Class type)
{
return getNonPrivateFinalMethodOrType(type) != null;
}
public static Object getNonPrivateFinalMethodOrType(Class type)
{
if (isFinal(type))
{
return type;
}
for (Method method : type.getDeclaredMethods())
{
if (isFinal(method) && !isPrivate(method))
{
return method;
}
}
return null;
}
public static boolean isPackagePrivate(int mod)
{
return !(Modifier.isPrivate(mod) || Modifier.isProtected(mod) || Modifier.isPublic(mod));
}
/**
* Checks if type is static
*
* @param type Type to check
* @return True if static, false otherwise
*/
public static boolean isStatic(Class type)
{
return Modifier.isStatic(type.getModifiers());
}
/**
* Checks if member is static
*
* @param member Member to check
* @return True if static, false otherwise
*/
public static boolean isStatic(Member member)
{
return Modifier.isStatic(member.getModifiers());
}
public static boolean isTransient(Member member)
{
return Modifier.isTransient(member.getModifiers());
}
/**
* Checks if a method is abstract
*
* @param method
* @return
*/
public static boolean isAbstract(Method method)
{
return Modifier.isAbstract(method.getModifiers());
}
/**
* Gets the actual type arguments of a class
*
* @param clazz The class to examine
* @return The type arguments
*/
public static Type[] getActualTypeArguments(Class clazz)
{
Type type = new HierarchyDiscovery(clazz).getResolvedType();
if (type instanceof ParameterizedType)
{
return ((ParameterizedType) type).getActualTypeArguments();
}
else
{
return EMPTY_TYPES;
}
}
/**
* Gets the actual type arguments of a Type
*
* @param type The type to examine
* @return The type arguments
*/
public static Type[] getActualTypeArguments(Type type)
{
Type resolvedType = new HierarchyDiscovery(type).getResolvedType();
if (resolvedType instanceof ParameterizedType)
{
return ((ParameterizedType) resolvedType).getActualTypeArguments();
}
else
{
return EMPTY_TYPES;
}
}
/**
* Checks if raw type is array type
*
* @param rawType The raw type to check
* @return True if array, false otherwise
*/
public static boolean isArrayType(Class rawType)
{
return rawType.isArray();
}
/**
* Checks if type is parameterized type
*
* @param type The type to check
* @return True if parameterized, false otherwise
*/
public static boolean isParameterizedType(Class type)
{
return type.getTypeParameters().length > 0;
}
public static boolean isParamerterizedTypeWithWildcard(Class type)
{
if (isParameterizedType(type))
{
return containsWildcards(type.getTypeParameters());
}
else
{
return false;
}
}
public static boolean containsWildcards(Type[] types)
{
for (Type type : types)
{
if (type instanceof WildcardType)
{
return true;
}
}
return false;
}
/**
* Checks the bindingType to make sure the annotation was declared properly
* as a binding type (annotated with @BindingType) and that it has a runtime
* retention policy.
*
* @param binding The binding type to check
* @return true only if the annotation is really a binding type
*/
@Deprecated
// TODO Replace usage of this with metadatacache
public static boolean isBindings(Annotation binding)
{
boolean isBindingAnnotation = false;
if (binding.annotationType().isAnnotationPresent(Qualifier.class) &&
binding.annotationType().isAnnotationPresent(Retention.class) &&
binding.annotationType().getAnnotation(Retention.class).value().equals(RetentionPolicy.RUNTIME))
{
isBindingAnnotation = true;
}
return isBindingAnnotation;
}
/**
* Check the assignability of one type to another, taking into account the
* actual type arguements
*
* @param rawType1 the raw type of the class to check
* @param actualTypeArguments1 the actual type arguements to check, or an
* empty array if not a parameterized type
* @param rawType2 the raw type of the class to check
* @param actualTypeArguments2 the actual type arguements to check, or an
* empty array if not a parameterized type
* @return
*/
public static boolean isAssignableFrom(Class rawType1, Type[] actualTypeArguments1,
Class rawType2, Type[] actualTypeArguments2)
{
return Types.boxedClass(rawType1).isAssignableFrom(Types.boxedClass(rawType2)) &&
isAssignableFrom(actualTypeArguments1, actualTypeArguments2);
}
public static boolean matches(Class rawType1, Type[] actualTypeArguments1,
Class rawType2, Type[] actualTypeArguments2)
{
return Types.boxedClass(rawType1).equals(Types.boxedClass(rawType2)) &&
isAssignableFrom(actualTypeArguments1, actualTypeArguments2);
}
public static boolean isAssignableFrom(Type[] actualTypeArguments1, Type[] actualTypeArguments2)
{
for (int i = 0; i < actualTypeArguments1.length; i++)
{
Type type1 = actualTypeArguments1[i];
Type type2 = Object.class;
if (actualTypeArguments2.length > i)
{
type2 = actualTypeArguments2[i];
}
if (!isAssignableFrom(type1, type2))
{
return false;
}
}
return true;
}
public static boolean isAssignableFrom(Type type1, Set types2)
{
for (Type type2 : types2)
{
if (isAssignableFrom(type1, type2))
{
return true;
}
}
return false;
}
public static boolean matches(Type type1, Set types2)
{
for (Type type2 : types2)
{
if (matches(type1, type2))
{
return true;
}
}
return false;
}
public static boolean isAssignableFrom(Type type1, Type[] types2)
{
for (Type type2 : types2)
{
if (isAssignableFrom(type1, type2))
{
return true;
}
}
return false;
}
public static boolean isAssignableFrom(Type type1, Type type2)
{
if (type1 instanceof Class)
{
Class clazz = (Class) type1;
if (isAssignableFrom(clazz, EMPTY_TYPES, type2))
{
return true;
}
}
if (type1 instanceof ParameterizedType)
{
ParameterizedType parameterizedType1 = (ParameterizedType) type1;
if (parameterizedType1.getRawType() instanceof Class)
{
if (isAssignableFrom((Class) parameterizedType1.getRawType(),
parameterizedType1.getActualTypeArguments(), type2))
{
return true;
}
}
}
if (type1 instanceof WildcardType)
{
WildcardType wildcardType = (WildcardType) type1;
if (isTypeBounded(type2, wildcardType.getLowerBounds(), wildcardType.getUpperBounds()))
{
return true;
}
}
if (type2 instanceof WildcardType)
{
WildcardType wildcardType = (WildcardType) type2;
if (isTypeBounded(type1, wildcardType.getUpperBounds(), wildcardType.getLowerBounds()))
{
return true;
}
}
if (type1 instanceof TypeVariable)
{
TypeVariable typeVariable = (TypeVariable) type1;
if (isTypeBounded(type2, EMPTY_TYPES, typeVariable.getBounds()))
{
return true;
}
}
if (type2 instanceof TypeVariable)
{
TypeVariable typeVariable = (TypeVariable) type2;
if (isTypeBounded(type1, typeVariable.getBounds(), EMPTY_TYPES))
{
return true;
}
}
return false;
}
public static boolean matches(Type type1, Type type2)
{
if (type1 instanceof Class)
{
Class clazz = (Class) type1;
if (matches(clazz, EMPTY_TYPES, type2))
{
return true;
}
}
if (type1 instanceof ParameterizedType)
{
ParameterizedType parameterizedType1 = (ParameterizedType) type1;
if (parameterizedType1.getRawType() instanceof Class)
{
if (matches((Class) parameterizedType1.getRawType(),
parameterizedType1.getActualTypeArguments(), type2))
{
return true;
}
}
}
if (type1 instanceof WildcardType)
{
WildcardType wildcardType = (WildcardType) type1;
if (isTypeBounded(type2, wildcardType.getLowerBounds(), wildcardType.getUpperBounds()))
{
return true;
}
}
if (type2 instanceof WildcardType)
{
WildcardType wildcardType = (WildcardType) type2;
if (isTypeBounded(type1, wildcardType.getUpperBounds(), wildcardType.getLowerBounds()))
{
return true;
}
}
if (type1 instanceof TypeVariable)
{
TypeVariable typeVariable = (TypeVariable) type1;
if (isTypeBounded(type2, EMPTY_TYPES, typeVariable.getBounds()))
{
return true;
}
}
if (type2 instanceof TypeVariable)
{
TypeVariable typeVariable = (TypeVariable) type2;
if (isTypeBounded(type1, typeVariable.getBounds(), EMPTY_TYPES))
{
return true;
}
}
return false;
}
public static boolean isTypeBounded(Type type, Type[] lowerBounds, Type[] upperBounds)
{
if (lowerBounds.length > 0)
{
if (!isAssignableFrom(type, lowerBounds))
{
return false;
}
}
if (upperBounds.length > 0)
{
if (!isAssignableFrom(upperBounds, type))
{
return false;
}
}
return true;
}
public static boolean isAssignableFrom(Class rawType1, Type[] actualTypeArguments1, Type type2)
{
if (type2 instanceof ParameterizedType)
{
ParameterizedType parameterizedType = (ParameterizedType) type2;
if (parameterizedType.getRawType() instanceof Class)
{
if (isAssignableFrom(rawType1, actualTypeArguments1, (Class) parameterizedType.getRawType(),
parameterizedType.getActualTypeArguments()))
{
return true;
}
}
}
else if (type2 instanceof Class)
{
Class clazz = (Class) type2;
if (isAssignableFrom(rawType1, actualTypeArguments1, clazz, EMPTY_TYPES))
{
return true;
}
}
else if (type2 instanceof TypeVariable)
{
TypeVariable typeVariable = (TypeVariable) type2;
if (isTypeBounded(rawType1, actualTypeArguments1, typeVariable.getBounds()))
{
return true;
}
}
return false;
}
public static boolean matches(Class rawType1, Type[] actualTypeArguments1, Type type2)
{
if (type2 instanceof ParameterizedType)
{
ParameterizedType parameterizedType = (ParameterizedType) type2;
if (parameterizedType.getRawType() instanceof Class)
{
if (matches(rawType1, actualTypeArguments1, (Class) parameterizedType.getRawType(),
parameterizedType.getActualTypeArguments()))
{
return true;
}
}
}
else if (type2 instanceof Class)
{
Class clazz = (Class) type2;
if (matches(rawType1, actualTypeArguments1, clazz, EMPTY_TYPES))
{
return true;
}
}
return false;
}
/**
* Check the assiginability of a set of flattened types. This
* algorithm will check whether any of the types1 matches a type in types2
*
* @param types1
* @param types2
* @return
*/
public static boolean isAssignableFrom(Set types1, Set types2)
{
for (Type type : types1)
{
if (isAssignableFrom(type, types2))
{
return true;
}
}
return false;
}
/**
* Check whether whether any of the types1 matches a type in types2
*
* @param types1
* @param types2
* @return
*/
public static boolean matches(Set types1, Set types2)
{
for (Type type : types1)
{
if (matches(type, types2))
{
return true;
}
}
return false;
}
/**
* Check the assignability of a set of flattened types. This
* algorithm will check whether any of the types1 matches a type in types2
*
* @param types1
* @param type2
* @return
*/
public static boolean isAssignableFrom(Set types1, Type type2)
{
for (Type type : types1)
{
if (isAssignableFrom(type, type2))
{
return true;
}
}
return false;
}
public static boolean isAssignableFrom(Type[] types1, Type type2)
{
for (Type type : types1)
{
if (isAssignableFrom(type, type2))
{
return true;
}
}
return false;
}
public static boolean isPrimitive(Type type)
{
Class rawType = getRawType(type);
return rawType == null ? false : rawType.isPrimitive();
}
}
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